Add epoll and do more release readiness changes

This change also pays off some of the remaining technical debt with
stdio, file descriptors, and memory managemnt polyfills.

Makefile

@@ -316,7 +316,7 @@ COSMOPOLITAN_HEADERS =		\
 
 o/$(MODE)/cosmopolitan.a: $(filter-out o/libc/stubs/exit11.o,$(foreach x,$(COSMOPOLITAN_OBJECTS),$($(x)_OBJS)))
 o/cosmopolitan.h:				\
-		o/$(MODE)/tool/build/rollup.com.dbg	\
+		o/$(MODE)/tool/build/rollup.com	\
 		libc/integral/normalize.inc	\
 		$(foreach x,$(COSMOPOLITAN_HEADERS),$($(x)_HDRS))
 	@ACTION=ROLLUP TARGET=$@ build/do $^ >$@

ape/ape.S

@@ -34,7 +34,6 @@
 │ αcτµαlly pδrταblε εxεcµταblε § program header                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "ape/config.h"
-#include "ape/lib/apm.h"
 #include "ape/lib/pc.h"
 #include "ape/macros.h"
 #include "ape/notice.inc"
@@ -49,7 +48,7 @@
 
 #define USE_SYMBOL_HACK 0
 
-	.source	"NOTICE"
+	.source	"LICENSE"
 	.source	"ape/ape.S"
 	.source	"ape/ape.lds"
 	.section .text,"ax",@progbits
@@ -360,85 +359,9 @@ pcread:	push	%ax
 	xor	%ax,%ax			# try disk reset on error
 	int	$0x13
 	pop	%ax
-	jmp	1b
+	jmp	pcread
 	.endfn	pcread
 
-/	Waits for serial lines to become idle.
-/
-/	@param	di short array of serial ports (0 means not present)
-/	@param	si number of items in array
-/	@mode	long,legacy,real
-sflush:	mov	%si,%cx
-	mov	%di,%si
-	xor	%dx,%dx
-0:	lodsb
-	mov	%al,%dl
-	lodsb
-	mov	%al,%dh
-	test	%ax,%ax
-	jz	2f
-	add	$UART_LSR,%dx
-	mov	$UART_TTYIDL,%ah
-1:	in	%dx,%al
-	and	%ah,%al
-	rep
-	nop
-	jz	1b
-	loop	0b
-2:	ret
-	.endfn	sflush,globl
-
-/	Transmits byte over serial line.
-/
-/	This is both blocking and asynchronous.
-/
-/	@param	di character to send
-/	@param	si serial port
-/	@mode	long,legacy,real
-/	@see	ttytxr
-sputc:	push	%ax
-	push	%cx
-	push	%dx
-	mov	%si,%dx
-	add	$UART_LSR,%dx
-	mov	$UART_TTYTXR,%ah
-1:	in	%dx,%al
-	and	%ah,%al
-	jnz	2f
-	rep
-	nop
-	jmp	1b
-2:	mov	%di,%ax
-	mov	%si,%dx
-	out	%al,%dx
-	pop	%dx
-	pop	%cx
-	pop	%ax
-	ret
-	.endfn	sputc,globl
-
-/	Shuts down personal computer.
-/
-/	@mode	real
-/	@noreturn
-apmoff:	mov	$0x5300,%ax		# apm installation check
-	xor	%bx,%bx			# for the apm bios itself
-	int	$APM_SERVICE
-	jc	1f
-	cmp	$'P<<8|'M,%bx		# did apm bios service interrupt?
-	jne	1f
-	mov	$0x5301,%ax		# real mode interface connect
-	xor	%bx,%bx			# to apm bios device
-	int	$APM_SERVICE		# ignore errors e.g. already connected
-	xor	%bx,%bx
-	xor	%cx,%cx
-	mov	$0x5307,%ax		# set power state
-	mov	$1,%bl			# for all devices within my dominion
-	mov	$3,%cl			# to off
-	int	$APM_SERVICE
-1:	call	panic
-	.endfn	apmoff,globl
-
 /*───────────────────────────────────────────────────────────────────────────│─╗
 │ αcτµαlly pδrταblε εxεcµταblε § partition table                           ─╬─│┼
 ╚────────────────────────────────────────────────────────────────────────────│*/
@@ -1156,115 +1079,41 @@ sinit:	mov	%di,%dx
 2:	ret
 	.endfn	sinit,global,hidden
 
-/	Abnormally exits program.
-/
-/	@param	di message
-/	@mode	real
-/	@noreturn
-rldie:	call	rlpute
-	call	rloff
-	.endfn	rldie,globl,hidden
-
-/	Shuts down machine.
-/
-/	@mode	real
-/	@noreturn
-rloff:	mov	$kBiosDataAreaXlm+COM1,%di
-	mov	$4,%si
-	call	sflush
-	call	apmoff
-	.endfn	rloff,globl,hidden
-
-/	Prints error message.
-/
-/	@param	di message
-/	@mode	real
-rlpute:	mov	kBiosDataAreaXlm+METAL_STDERR(%bx),%si
-	test	%si,%si
-	jnz	1f
-	mov	kBiosDataAreaXlm+METAL_STDOUT,%si
-1:	xor	%ax,%ax
-	push	%ax
-	push	%si
-	mov	$REAL(.Lstr.crlf),%ax
-	push	%ax
-	push	%si
-	push	%di
-	push	%si
-	mov	$REAL(.Lstr.error),%ax
-	push	%ax
-1:	pop	%di
-	test	%di,%di
-	jz	2f
-	pop	%si
-	call	rlput2
-	jmp	1b
-2:	ret
-	.endfn	rlpute,globl,hidden
-
-/	Prints string to both video and serial.
-/
-/	@param	di NUL-terminated string
-/	@param	si serial port
-/	@mode	real
-rlput2:	push	%di
-	push	%si
-	call	rvputs
-	pop	%si
-	pop	%di
-	test	%si,%si
-	jz	1f
-	call	sputs
-1:	ret
-	.endfn	rlput2,globl,hidden
-
-/	Writes string to serial line.
-/
-/	@param	di NUL-terminated string
-/	@param	si serial port
-/	@mode	long,legacy,real
-sputs:	push	%bx
-	mov	%di,%bx
-1:	xchg	%bx,%si
-	lodsb
-	xchg	%bx,%si
-	test	%al,%al
-	jz	2f
-	mov	%ax,%di
-	push	%si
-	rlcall	sputc
-	pop	%si
-	jmp	1b
-2:	pop	%bx
-	ret
-	.endfn	sputs,globl
-
 /	Video put string.
 /
 /	@param	di is the string
 /	@mode	real
-rvputs:	mov	%di,%si
+rvputs:	push	%bp
+	push	%bx
+	mov	%di,%si
 0:	lodsb
 	test	%al,%al
 	je	1f
-	rlcall	rvputc
-	jmp	0b
-1:	ret
-	.endfn	rvputs,globl,hidden
-
-/	Video put char.
-/
-/	@param	al is the char
-/	@mode	real
-rvputc:	push	%bx				# don't clobber bp,bx,di,si,cx
-	push	%bp				# original ibm pc scroll up bug
 	mov	$7,%bx				# normal mda/cga style page zero
 	mov	$0x0e,%ah			# teletype output al cp437
 	int	$0x10				# vidya service
-	pop	%bp				# preserves al
+	jmp	0b
-	pop	%bx
+1:	pop	%bx
+	pop	%bp
 	ret
-	.endfn	rvputc
+	.endfn	rvputs,globl,hidden
+
+/	Abnormally halts startup.
+/
+/	@param	di message
+/	@mode	real
+/	@noreturn
+rldie:	push	%di
+	mov	$REAL(.Lstr.error),%di
+	call	rvputs
+	pop	%di
+	call	rvputs
+	mov	$REAL(.Lstr.crlf),%di
+	call	rvputs
+	xor	%ax,%ax				# get keystroke
+	int	$0x16				# keyboard service
+	jmp	triplf
+	.endfn	rldie,globl,hidden
 
 /*                                                               █ █▒
                                                                █     █
@@ -1321,6 +1170,7 @@ longmodeloader:
 	jc	9f
 	call	unreal
 /	call	hiload
+	call	pinit
 	jmp	golong
 9:	mov	$REAL(.Lstr.e820),%ax
 	call	rldie
@@ -1568,7 +1418,6 @@ pinit:	push	%ds
 /	@see	Intel Manual V3A §4.1.2
 golong:	cli
 	lidt	XLM(BADIDT)
-	call	pinit
 	mov	%cr4,%eax
 	or	$CR4_PAE|CR4_PGE|CR4_OSFXSR,%eax
 	mov	%eax,%cr4

ape/lib/apelib.mk

@@ -21,7 +21,7 @@ APE_LIB_A_OBJS =					\
 	$(APE_LIB_A_SRCS:%=o/$(MODE)/%.zip.o)		\
 	o/$(MODE)/ape/ape.lds.zip.o			\
 	o/$(MODE)/ape/ape.S.zip.o			\
-	o/$(MODE)/NOTICE.zip.o
+	o/$(MODE)/LICENSE.zip.o
 
 APE_LIB_A_CHECKS = $(APE_LIB_A_HDRS:%=o/$(MODE)/%.ok)
 APE_LIB_A_DIRECTDEPS = LIBC_STR LIBC_STUBS

examples/hangman.c

@@ -0,0 +1,197 @@
+/* UNIX v7 usr/src/games/hangman.c
+ *
+ * Copyright 2002 Caldera International Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code and documentation must retain the
+ * above copyright notice, this list of conditions and the following
+ * disclaimer. Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided with
+ * the distribution.
+ *
+ * All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ *
+ * This product includes software developed or owned by Caldera
+ * International, Inc.
+ *
+ * Neither the name of Caldera International, Inc. nor the names of
+ * other contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENCE BY CALDERA
+ * INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL CALDERA INTERNATIONAL, BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "libc/calls/calls.h"
+#include "libc/calls/struct/stat.h"
+#include "libc/rand/rand.h"
+#include "libc/runtime/runtime.h"
+#include "libc/stdio/stdio.h"
+#include "libc/str/str.h"
+#include "libc/time/time.h"
+#include "third_party/zlib/zlib.h"
+
+/* clang-format off */
+#define DICT "usr/share/dict/hangman"
+#define MAXERR 7
+#define MINSCORE 0
+#define MINLEN 7
+
+char *dictfile;
+int alive,lost;
+FILE *dict;
+long int dictlen;
+float errors=0, words=0;
+char word[26],alph[26],realword[26];
+
+void fatal(s)
+	char *s;
+{
+	fprintf(stderr,"%s\n",s);
+	exit(1);
+}
+
+void setup()
+{
+	long tvec;
+	struct stat statb;
+	time(&tvec);
+	srand(tvec);
+	if((dict=fopen(dictfile,"r"))==NULL) fatal("no dictionary");
+	if(stat(dictfile,&statb)<0) fatal("can't stat");
+	dictlen=statb.st_size;
+}
+
+double frand()
+{
+	return(rand()/32768.);
+}
+
+void pscore()
+{
+	if(words!=0) printf("(%4.2f/%.0f) ",errors/words,words);
+}
+
+void getword()
+{	char wbuf[128],c;
+	int i,j;
+loop:
+	if(fscanf(dict,"%s\n",wbuf)==EOF)
+	{	fseek(dict,0L,0);
+		goto loop;
+	}
+	if((c=wbuf[0])>'z' || c<'a') goto loop;
+	for(i=j=0;wbuf[j]!=0;i++,j++)
+	{	if(wbuf[j]=='-') j++;
+		wbuf[i]=wbuf[j];
+	}
+	wbuf[i]=0;
+	if(i<MINLEN) goto loop;
+	for(j=0;j<i;j++)
+		if((c=wbuf[j])<'a' || c>'z') goto loop;
+	pscore();
+	strcpy(realword,wbuf);
+	for(j=0;j<i;word[j++]='.');
+}
+
+void startnew()
+{	int i;
+	long int pos;
+	char buf[128];
+	for(i=0;i<26;i++) word[i]=alph[i]=realword[i]=0;
+	pos=frand()*dictlen;
+        pos%=dictlen;
+	fseek(dict,pos,0);
+	fscanf(dict,"%s\n",buf);
+	getword();
+	alive=MAXERR;
+	lost=0;
+}
+
+void stateout()
+{	int i;
+	printf("guesses: ");
+	for(i=0;i<26;i++)
+		if(alph[i]!=0) putchar(alph[i]);
+	printf(" word: %s ",word);
+	printf("errors: %d/%d\n",MAXERR-alive,MAXERR);
+}
+
+void getguess()
+{	char gbuf[128],c;
+	int ok=0,i;
+loop:
+	printf("guess: ");
+	if(gets(gbuf)==NULL)
+	{	putchar('\n');
+		exit(0);
+	}
+	if((c=gbuf[0])<'a' || c>'z')
+	{	printf("lower case\n");
+		goto loop;
+	}
+	if(alph[c-'a']!=0)
+	{	printf("you guessed that\n");
+		goto loop;
+	}
+	else alph[c-'a']=c;
+	for(i=0;realword[i]!=0;i++)
+		if(realword[i]==c)
+		{	word[i]=c;
+			ok=1;
+		}
+	if(ok==0)
+	{	alive--;
+		errors=errors+1;
+		if(alive<=0) lost=1;
+		return;
+	}
+	for(i=0;word[i]!=0;i++)
+		if(word[i]=='.') return;
+	alive=0;
+	lost=0;
+	return;
+}
+
+void wordout()
+{
+	errors=errors+2;
+	printf("the answer was %s, you blew it\n",realword);
+}
+
+void youwon()
+{
+	printf("you win, the word is %s\n",realword);
+}
+
+main(argc,argv)
+	char **argv;
+{
+	if(argc==1) dictfile=DICT;
+	else dictfile=argv[1];
+	setup();
+	for(;;)
+	{	startnew();
+		while(alive>0)
+		{	stateout();
+			getguess();
+		}
+		words=words+1;
+		if(lost) wordout();
+		else youwon();
+	}
+}

examples/nesemu1.cc

@@ -43,7 +43,7 @@
 #include "libc/time/time.h"
 #include "libc/x/x.h"
 #include "libc/zip.h"
-#include "libc/zipos/zipos.h"
+#include "libc/zipos/zipos.internal.h"
 #include "third_party/getopt/getopt.h"
 #include "tool/viz/lib/knobs.h"
 

libc/bits/bits.h

@@ -278,22 +278,12 @@ unsigned long hamming(unsigned long, unsigned long) pureconst;
  * @see lockcmpxchg()
  */
 #define cmpxchg(IFTHING, ISEQUALTOME, REPLACEITWITHME)                        \
-  ({                                                                      \
-    bool DidIt;                                                           \
-    asm(ZFLAG_ASM("cmpxchg\t%3,%1")                                       \
-        : ZFLAG_CONSTRAINT(DidIt), "+m"(*(IFTHING)), "+a"(*(ISEQUALTOME)) \
-        : "r"((typeof(*(IFTHING)))(REPLACEITWITHME))                      \
-        : "cc");                                                          \
-    DidIt;                                                                \
-  })
-
-#define ezcmpxchg(IFTHING, ISEQUALTOME, REPLACEITWITHME)             \
   ({                                                                          \
     bool DidIt;                                                               \
     autotype(IFTHING) IfThing = (IFTHING);                                    \
     typeof(*IfThing) IsEqualToMe = (ISEQUALTOME);                             \
     typeof(*IfThing) ReplaceItWithMe = (REPLACEITWITHME);                     \
-    asm(ZFLAG_ASM("cmpxchg\t%3,%1")                                  \
+    asm volatile(ZFLAG_ASM("cmpxchg\t%3,%1")                                  \
                  : ZFLAG_CONSTRAINT(DidIt), "+m"(*IfThing), "+a"(IsEqualToMe) \
                  : "r"(ReplaceItWithMe)                                       \
                  : "cc");                                                     \
@@ -310,9 +300,12 @@ unsigned long hamming(unsigned long, unsigned long) pureconst;
 #define lockcmpxchg(IFTHING, ISEQUALTOME, REPLACEITWITHME)                    \
   ({                                                                          \
     bool DidIt;                                                               \
-    asm(ZFLAG_ASM("lock cmpxchg\t%3,%1")                                  \
+    autotype(IFTHING) IfThing = (IFTHING);                                    \
-        : ZFLAG_CONSTRAINT(DidIt), "+m"(*(IFTHING)), "+a"(*(ISEQUALTOME)) \
+    typeof(*IfThing) IsEqualToMe = (ISEQUALTOME);                             \
-        : "r"((typeof(*(IFTHING)))(REPLACEITWITHME))                      \
+    typeof(*IfThing) ReplaceItWithMe = (REPLACEITWITHME);                     \
+    asm volatile(ZFLAG_ASM("lock cmpxchg\t%3,%1")                             \
+                 : ZFLAG_CONSTRAINT(DidIt), "+m"(*IfThing), "+a"(IsEqualToMe) \
+                 : "r"(ReplaceItWithMe)                                       \
                  : "cc");                                                     \
     DidIt;                                                                    \
   })

libc/calls/chdir-nt.c

@@ -33,6 +33,6 @@ textwindows int chdir$nt(const char *path) {
   if (SetCurrentDirectory(path16)) {
     return 0;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/close-nt.c

@@ -24,7 +24,7 @@
 
 textwindows int close$nt(int fd) {
   bool32 ok;
-  if (isfdopen(fd)) {
+  if (__isfdopen(fd)) {
     if (g_fds.p[fd].kind == kFdFile) {
       /*
        * Like Linux, closing a file on Windows doesn't guarantee it's
@@ -37,8 +37,8 @@ textwindows int close$nt(int fd) {
     if (g_fds.p[fd].kind == kFdConsole) {
       ok &= CloseHandle(g_fds.p[fd].extra);
     }
-    removefd(fd);
+    __removefd(fd);
-    return ok ? 0 : winerr();
+    return ok ? 0 : __winerr();
   } else {
     return ebadf();
   }

libc/calls/close.c

@@ -20,9 +20,10 @@
 #include "libc/bits/weaken.h"
 #include "libc/calls/calls.h"
 #include "libc/calls/internal.h"
+#include "libc/macros.h"
 #include "libc/sock/internal.h"
 #include "libc/sysv/errfuns.h"
-#include "libc/zipos/zipos.h"
+#include "libc/zipos/zipos.internal.h"
 
 /**
  * Closes file descriptor.
@@ -32,17 +33,24 @@
  */
 int close(int fd) {
   int rc;
-  if (fd == -1) return einval();
+  if (fd < 0) return einval();
-  if (isfdkind(fd, kFdZip)) {
+  if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
-    rc = weaken(__zipos_close)(
+    rc = weaken(__zipos_close)(fd);
-        (struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle);
+  } else if (fd < g_fds.n && g_fds.p[fd].kind == kFdEpoll) {
+    rc = weaken(close$epoll)(fd);
   } else if (!IsWindows()) {
     rc = close$sysv(fd);
-  } else if (isfdkind(fd, kFdSocket)) {
+  } else if (fd < g_fds.n && g_fds.p[fd].kind == kFdSocket) {
     rc = weaken(closesocket$nt)(fd);
-  } else {
+  } else if (fd < g_fds.n &&
+             (g_fds.p[fd].kind == kFdFile || g_fds.p[fd].kind == kFdConsole)) {
     rc = close$nt(fd);
+  } else {
+    rc = ebadf();
+  }
+  if (fd < g_fds.n) {
+    g_fds.p[fd].kind = kFdEmpty;
+    g_fds.f = MIN(g_fds.f, fd);
   }
-  removefd(fd);
   return rc;
 }

libc/calls/dup-nt.c

@@ -30,17 +30,17 @@
  * Implements dup(), dup2(), and dup3() for Windows NT.
  */
 textwindows int dup$nt(int oldfd, int newfd, int flags) {
-  if (!isfdkind(oldfd, kFdFile)) return ebadf();
+  if (!__isfdkind(oldfd, kFdFile)) return ebadf();
   if (newfd == -1) {
-    if ((newfd = createfd()) == -1) return -1;
+    if ((newfd = __getemptyfd()) == -1) {
-  } else if (isfdindex(newfd)) {
+      return -1;
+    }
+  } else if (__ensurefds(newfd) != -1) {
     if (g_fds.p[newfd].kind != kFdEmpty) {
       close(newfd);
     }
   } else {
-    do {
+    return -1;
-      if (growfds() == -1) return -1;
-    } while (newfd >= g_fds.n);
   }
   if (DuplicateHandle(GetCurrentProcess(), g_fds.p[oldfd].handle,
                       GetCurrentProcess(), &g_fds.p[newfd].handle, 0,
@@ -49,6 +49,6 @@ textwindows int dup$nt(int oldfd, int newfd, int flags) {
     g_fds.p[newfd].flags = flags;
     return newfd;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/fadvise-nt.c

@@ -38,7 +38,7 @@ textwindows int fadvise$nt(int fd, uint64_t offset, uint64_t len, int advice) {
   struct NtIoStatusBlock iostatus;
   struct NtFileBasicInformation basicinfo;
   struct NtFileAccessInformation accessinfo;
-  if (!isfdkind(fd, kFdFile)) return ebadf();
+  if (!__isfdkind(fd, kFdFile)) return ebadf();
   sharemode = /* xxx: no clue how to query this */
       kNtFileShareRead | kNtFileShareWrite | kNtFileShareDelete;
   /* TODO(jart): can we do it in one call w/ NtQueryObject? */
@@ -56,7 +56,7 @@ textwindows int fadvise$nt(int fd, uint64_t offset, uint64_t len, int advice) {
       }
       return 0;
     }
-    return winerr();
+    return __winerr();
   } else if (status == kNtStatusDllNotFound) {
     return enosys();
   } else {

libc/calls/fallocate.c

@@ -51,7 +51,7 @@ int fallocate(int fd, int32_t mode, int64_t offset, int64_t length) {
   } else if (!IsWindows()) {
     return posix_fallocate$sysv(fd, offset, length);
   } else if (IsWindows()) {
-    if (!isfdkind(fd, kFdFile)) return ebadf();
+    if (!__isfdkind(fd, kFdFile)) return ebadf();
     if (mode == FALLOC_FL_ZERO_RANGE) {
       if (DeviceIoControl(
               g_fds.p[fd].handle, kNtFsctlSetZeroData,
@@ -59,7 +59,7 @@ int fallocate(int fd, int32_t mode, int64_t offset, int64_t length) {
               sizeof(struct NtFileZeroDataInformation), NULL, 0, &br, NULL)) {
         return 0;
       } else {
-        return winerr();
+        return __winerr();
       }
     } else if (!mode && !offset) {
       /*

libc/calls/fcntl-nt.c

@@ -21,20 +21,31 @@
 #include "libc/nt/files.h"
 #include "libc/sysv/consts/f.h"
 #include "libc/sysv/consts/fd.h"
+#include "libc/sysv/consts/o.h"
 #include "libc/sysv/errfuns.h"
 
 textwindows int fcntl$nt(int fd, int cmd, unsigned arg) {
   uint32_t flags;
-  if (!isfdkind(fd, kFdFile)) return ebadf();
+  if (!__isfdkind(fd, kFdFile)) return ebadf();
   switch (cmd) {
+    case F_GETFL:
+      return g_fds.p[fd].flags;
+    case F_SETFL:
+      return (g_fds.p[fd].flags = arg);
     case F_GETFD:
-      if (!GetHandleInformation(g_fds.p[fd].handle, &flags)) return -1;
+      if (g_fds.p[fd].flags & O_CLOEXEC) {
-      arg = (flags & FD_CLOEXEC) ^ FD_CLOEXEC;
+        return FD_CLOEXEC;
-      return arg;
+      } else {
-    case F_SETFD:
-      arg ^= FD_CLOEXEC;
-      if (!SetHandleInformation(g_fds.p[fd].handle, FD_CLOEXEC, arg)) return -1;
         return 0;
+      }
+    case F_SETFD:
+      if (arg & O_CLOEXEC) {
+        g_fds.p[fd].flags |= O_CLOEXEC;
+        return FD_CLOEXEC;
+      } else {
+        g_fds.p[fd].flags &= ~O_CLOEXEC;
+        return 0;
+      }
     default:
       return 0; /* TODO(jart): Implement me. */
   }

libc/calls/fdatasync-nt.c

@@ -22,11 +22,11 @@
 #include "libc/sysv/errfuns.h"
 
 textwindows int fdatasync$nt(int fd) {
-  if (!isfdkind(fd, kFdFile)) return ebadf();
+  if (!__isfdkind(fd, kFdFile)) return ebadf();
   /*
    * XXX: On Windows NT this might be more analagous to fflush() and
    *      Microsoft docs say to do manual block i/o for database-ish
    *      guarantees on disk persistence. Consider: Really good UPS.
    */
-  return FlushFileBuffers(g_fds.p[fd].handle) ? 0 : winerr();
+  return FlushFileBuffers(g_fds.p[fd].handle) ? 0 : __winerr();
 }

libc/calls/fdkind.c

@@ -20,7 +20,7 @@
 #include "libc/calls/internal.h"
 
 enum FdKind fdkind(int fd) {
-  if (isfdindex(fd)) {
+  if (0 <= fd && fd <= g_fds.n) {
     return g_fds.p[fd].kind;
   } else {
     return kFdEmpty;

libc/calls/flock-nt.c

@@ -29,7 +29,7 @@
 textwindows int flock$nt(int fd, int op) {
   struct NtOverlapped ov;
   struct NtByHandleFileInformation info;
-  if (!isfdkind(fd, kFdFile)) return ebadf();
+  if (!__isfdkind(fd, kFdFile)) return ebadf();
   memset(&ov, 0, sizeof(ov));
   if (GetFileInformationByHandle(g_fds.p[fd].handle, &info) &&
       ((!(op & LOCK_UN) &&
@@ -39,6 +39,6 @@ textwindows int flock$nt(int fd, int op) {
                                        info.nFileSizeHigh, &ov)))) {
     return 0;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/fstat-nt.c

@@ -66,6 +66,6 @@ textwindows int fstat$nt(int64_t handle, struct stat *st) {
     st->st_blocks = roundup(actualsize, PAGESIZE) / 512;
     return 0;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/fstat.c

@@ -22,20 +22,20 @@
 #include "libc/calls/internal.h"
 #include "libc/dce.h"
 #include "libc/sysv/errfuns.h"
-#include "libc/zipos/zipos.h"
+#include "libc/zipos/zipos.internal.h"
 
 /**
  * Returns information about file, via open()'d descriptor.
  * @asyncsignalsafe
  */
 int fstat(int fd, struct stat *st) {
-  if (isfdkind(fd, kFdZip)) {
+  if (__isfdkind(fd, kFdZip)) {
     return weaken(__zipos_fstat)(
         (struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, st);
   } else if (!IsWindows()) {
     return fstat$sysv(fd, st);
   } else {
-    if (!isfdkind(fd, kFdFile)) return ebadf();
+    if (!__isfdkind(fd, kFdFile)) return ebadf();
     return fstat$nt(g_fds.p[fd].handle, st);
   }
 }

libc/calls/ftruncate-nt.c

@@ -25,14 +25,14 @@
 textwindows int ftruncate$nt(int fd, uint64_t length) {
   bool32 ok;
   int64_t tell;
-  if (!isfdkind(fd, kFdFile)) return ebadf();
+  if (!__isfdkind(fd, kFdFile)) return ebadf();
   tell = -1;
   if (SetFilePointerEx(g_fds.p[fd].handle, 0, &tell, kNtFileCurrent)) {
     ok = SetFilePointerEx(g_fds.p[fd].handle, length, NULL, kNtFileBegin) &&
          SetEndOfFile(g_fds.p[fd].handle);
     SetFilePointerEx(g_fds.p[fd].handle, tell, NULL, kNtFileBegin);
-    return ok ? 0 : winerr();
+    return ok ? 0 : __winerr();
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/g_fds.c

@@ -33,12 +33,22 @@ void InitializeFileDescriptors(void) {
   pushmov(&fds->f, 3ul);
   pushmov(&fds->n, ARRAYLEN(fds->__init_p));
   fds->p = fds->__init_p;
+  if (!IsMetal()) {
     fds->__init_p[STDIN_FILENO].kind = pushpop(kFdFile);
     fds->__init_p[STDOUT_FILENO].kind = pushpop(kFdFile);
     fds->__init_p[STDERR_FILENO].kind = pushpop(kFdFile);
-  fds->__init_p[STDIN_FILENO].handle = GetStdHandle(pushpop(kNtStdInputHandle));
+    fds->__init_p[STDIN_FILENO].handle =
+        GetStdHandle(pushpop(kNtStdInputHandle));
     fds->__init_p[STDOUT_FILENO].handle =
         GetStdHandle(pushpop(kNtStdOutputHandle));
     fds->__init_p[STDERR_FILENO].handle =
         GetStdHandle(pushpop(kNtStdErrorHandle));
+  } else {
+    fds->__init_p[STDIN_FILENO].kind = pushpop(kFdSerial);
+    fds->__init_p[STDOUT_FILENO].kind = pushpop(kFdSerial);
+    fds->__init_p[STDERR_FILENO].kind = pushpop(kFdSerial);
+    fds->__init_p[STDIN_FILENO].handle = 0x3F8;
+    fds->__init_p[STDOUT_FILENO].handle = 0x3F8;
+    fds->__init_p[STDERR_FILENO].handle = 0x3F8;
+  }
 }

libc/calls/getcwd-nt.c

@@ -31,7 +31,7 @@ textwindows char *getcwd$nt(char *buf, size_t size) {
       erange();
     }
   } else {
-    winerr();
+    __winerr();
   }
   return NULL;
 }

libc/calls/getdomainname.c

@@ -45,7 +45,7 @@ int getdomainname(char *name, size_t len) {
   } else {
     nSize = ARRAYLEN(name16);
     if (!GetComputerNameEx(kNtComputerNameDnsFullyQualified, name16, &nSize)) {
-      return winerr();
+      return __winerr();
     }
     tprecode16to8(name, MIN(MIN(ARRAYLEN(name16), nSize + 1), len), name16);
     return 0;

libc/calls/getemptyfd.c

@@ -25,14 +25,11 @@
 /**
  * Finds open file descriptor slot.
  */
-ssize_t createfd(void) {
+ssize_t __getemptyfd(void) {
-  size_t fd;
+  for (; g_fds.f < g_fds.n; ++g_fds.f) {
-  for (;;) {
+    if (g_fds.p[g_fds.f].kind == kFdEmpty) {
-    while (g_fds.f < g_fds.n) {
+      return g_fds.f;
-      if (g_fds.p[(fd = g_fds.f++)].kind == kFdEmpty) {
-        return fd;
     }
   }
-    if (growfds() == -1) return -1;
+  return __ensurefds(g_fds.f);
-  }
 }

libc/calls/gethostname.c

@@ -50,7 +50,7 @@ int gethostname(char *name, size_t len) {
   } else {
     nSize = ARRAYLEN(name16);
     if (!GetComputerNameEx(kNtComputerNameDnsHostname, name16, &nSize)) {
-      return winerr();
+      return __winerr();
     }
     tprecode16to8(name, MIN(MIN(ARRAYLEN(name16), nSize + 1), len), name16);
     return 0;

libc/calls/getpriority-nt.c

@@ -46,6 +46,6 @@ textwindows int getpriority$nt(int ignored) {
     }
     abort();
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/getrusage-nt.c

@@ -40,6 +40,6 @@ textwindows int getrusage$nt(int who, struct rusage *usage) {
     FileTimeToTimeVal(&usage->ru_stime, KernelFileTime);
     return 0;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/growfds.c

@@ -23,18 +23,20 @@
 #include "libc/mem/mem.h"
 #include "libc/sysv/errfuns.h"
 
-int growfds(void) {
+int __ensurefds(int fd) {
   size_t i, n;
   struct Fd *p;
+  if (fd < g_fds.n) return fd;
   if (weaken(realloc)) {
-    if ((p = weaken(realloc)(g_fds.p != g_fds.__init_p ? g_fds.p : NULL,
+    if ((p = weaken(realloc)(
-                             (n = (i = g_fds.n) << 1) * sizeof(*p)))) {
+             g_fds.p != g_fds.__init_p ? g_fds.p : NULL,
+             (n = MAX(fd + 1, (i = g_fds.n) << 1)) * sizeof(*p)))) {
       do {
         p[i++].kind = kFdEmpty;
       } while (i < n);
       g_fds.p = p;
       g_fds.n = n;
-      return 0;
+      return fd;
     } else {
       return enomem();
     }

libc/calls/hefty/copyfile.c

@@ -55,7 +55,7 @@ static textwindows int copyfile$nt(const char *src, const char *dst,
     }
     return 0;
   } else {
-    return winerr();
+    return __winerr();
   }
 }
 

libc/calls/hefty/dirstream.c

@@ -74,7 +74,7 @@ static textwindows noinline DIR *opendir$nt(const char *name) {
   if ((res->fd = FindFirstFile(name16, &res->windata)) != -1) {
     return res;
   } else {
-    winerr();
+    __winerr();
     free(res);
     return NULL;
   }
@@ -220,7 +220,7 @@ int closedir(DIR *dir) {
     if (!IsWindows()) {
       rc = close(dir->fd);
     } else {
-      rc = FindClose(dir->fd) ? 0 : winerr();
+      rc = FindClose(dir->fd) ? 0 : __winerr();
     }
     free(dir);
   } else {

libc/calls/hefty/fork-nt.c

@@ -67,7 +67,7 @@ textwindows void WinMainForked(void) {
   char16_t *p;
   uint64_t size;
   char16_t var[21 + 1 + 21 + 1];
-  uint32_t i, varlen, protect, access;
+  uint32_t i, varlen, protect, access, oldprot;
   varlen = GetEnvironmentVariable(u"_FORK", var, ARRAYLEN(var));
   if (!varlen || varlen >= ARRAYLEN(var)) return;
   p = var;
@@ -98,11 +98,13 @@ textwindows void WinMainForked(void) {
         break;
     }
     if (_mmi.p[i].flags & MAP_PRIVATE) {
-      MapViewOfFileExNuma(
+      MapViewOfFileExNuma((_mmi.p[i].h = CreateFileMappingNuma(
-          (_mmi.p[i].h = CreateFileMappingNuma(-1, NULL, protect, 0, size, NULL,
+                               -1, NULL, kNtPageExecuteReadwrite, 0, size, NULL,
                                kNtNumaNoPreferredNode)),
-          access, 0, 0, size, addr, kNtNumaNoPreferredNode);
+                          kNtFileMapRead | kNtFileMapWrite | kNtFileMapExecute,
+                          0, 0, size, addr, kNtNumaNoPreferredNode);
       ReadAll(h, addr, size);
+      VirtualProtect(addr, size, protect, &oldprot);
     } else {
       MapViewOfFileExNuma(_mmi.p[i].h, access, 0, 0, size, addr,
                           kNtNumaNoPreferredNode);
@@ -148,7 +150,7 @@ textwindows int fork$nt(void) {
       }
       unsetenv("_FORK");
     } else {
-      rc = winerr();
+      rc = __winerr();
     }
   } else {
     rc = 0;

libc/calls/hefty/ntspawn.c

@@ -78,7 +78,7 @@ textwindows int ntspawn(
                       opt_out_lpProcessInformation)) {
       rc = 0;
     } else {
-      rc = winerr();
+      rc = __winerr();
     }
   } else {
     rc = -1;

libc/calls/hefty/spawnve-nt.c

@@ -49,14 +49,14 @@ textwindows int spawnve$nt(unsigned flags, int stdiofds[3], const char *program,
   sti.cb = sizeof(sti);
   sti.dwFlags = kNtStartfUsestdhandles;
 
-  if ((pid = createfd()) == -1) return -1;
+  if ((pid = __getemptyfd()) == -1) return -1;
 
   for (i = 0; i < 3; ++i) {
     if (stdiofds[i] == -1) {
       x = &h;
       y = &sti.stdiofds[i];
       if (kIoMotion[i]) xchg(&x, &y);
-      if ((tubes[i] = createfd()) != -1 &&
+      if ((tubes[i] = __getemptyfd()) != -1 &&
           CreatePipe(x, y, &kNtIsInheritable, 0)) {
         g_fds.p[tubes[i]].handle = h;
       } else {

libc/calls/hefty/ttyname_r.c

@@ -76,7 +76,7 @@ int ttyname_r(int fd, char *buf, size_t size) {
   } else if (IsFreebsd()) {
     return ttyname$freebsd(fd, buf, size);
   } else if (IsWindows()) {
-    if (isfdkind(fd, kFdFile)) {
+    if (__isfdkind(fd, kFdFile)) {
       return ttyname$nt(fd, buf, size);
     } else {
       return ebadf();

libc/calls/internal.h

@@ -2,6 +2,7 @@
 #define COSMOPOLITAN_LIBC_CALLS_INTERNAL_H_
 #ifndef __STRICT_ANSI__
 #include "libc/calls/calls.h"
+#include "libc/calls/struct/iovec.h"
 #include "libc/calls/struct/itimerval.h"
 #include "libc/calls/struct/timespec.h"
 #include "libc/calls/struct/timeval.h"
@@ -37,7 +38,7 @@ struct IoctlPtmGet {
 
 struct Fds {
   size_t f;  // arbitrary free slot start search index
-  size_t n;  // capacity
+  size_t n;  // monotonic capacity
   struct Fd {
     int64_t handle;
     int64_t extra;
@@ -47,7 +48,9 @@ struct Fds {
       kFdSocket,
       kFdProcess,
       kFdConsole,
+      kFdSerial,
       kFdZip,
+      kFdEpoll,
     } kind;
     unsigned flags;
   } * p;
@@ -62,20 +65,12 @@ hidden extern struct NtSystemInfo g_ntsysteminfo;
 hidden extern struct NtStartupInfo g_ntstartupinfo;
 hidden extern const struct NtSecurityAttributes kNtIsInheritable;
 
-ssize_t createfd(void) hidden;
+ssize_t __getemptyfd(void) hidden;
-int growfds(void) hidden;
+int __ensurefds(int) hidden;
-void removefd(int) hidden;
+void __removefd(int) hidden;
 enum FdKind fdkind(int) hidden nosideeffect;
-bool isfdopen(int) hidden nosideeffect;
+bool __isfdopen(int) hidden nosideeffect;
-bool isfdkind(int, enum FdKind) hidden nosideeffect;
+bool __isfdkind(int, enum FdKind) hidden nosideeffect;
-
-forceinline bool isfdindex(int fd) {
-  if (!IsTrustworthy()) {
-    return (0 <= fd && fd < g_fds.n);
-  } else {
-    return true;
-  }
-}
 
 forceinline size_t clampio(size_t size) {
   if (!IsTrustworthy()) {
@@ -267,7 +262,7 @@ bool32 onntconsoleevent$nt(u32) hidden;
 void __winalarm(void *, uint32_t, uint32_t) hidden;
 int ntaccesscheck(const char16_t *, u32) paramsnonnull() hidden;
 i64 ntreturn(u32);
-i64 winerr(void) nocallback privileged;
+i64 __winerr(void) nocallback privileged;
 
 #define mkntpath(PATH, PATH16) mkntpath2(PATH, -1u, PATH16)
 #define mkntpath2(PATH, FLAGS, PATH16)                           \
@@ -280,6 +275,13 @@ i64 winerr(void) nocallback privileged;
     Count;                                                       \
   })
 
+/*───────────────────────────────────────────────────────────────────────────│─╗
+│ cosmopolitan § syscalls » drivers                                        ─╬─│┼
+╚────────────────────────────────────────────────────────────────────────────│*/
+
+ssize_t readv$serial(struct Fd *, const struct iovec *, int) hidden;
+ssize_t writev$serial(struct Fd *, const struct iovec *, int) hidden;
+
 #undef sigset
 #undef i32
 #undef i64

libc/calls/ioctl-default.c

@@ -29,13 +29,13 @@ int ioctl$default(int fd, uint64_t request, void *memory) {
   int64_t handle;
   if (!IsWindows()) {
     return ioctl$sysv(fd, request, memory);
-  } else if (isfdopen(fd)) {
+  } else if (__isfdopen(fd)) {
     if (g_fds.p[fd].kind == kFdSocket) {
       handle = g_fds.p[fd].handle;
       if ((rc = weaken(__ioctlsocket$nt)(handle, request, memory)) != -1) {
         return rc;
       } else {
-        return weaken(winsockerr)();
+        return weaken(__winsockerr)();
       }
     } else {
       return eopnotsupp();

libc/calls/ioctl-tiocgwinsz-nt.c

@@ -33,7 +33,7 @@ textwindows int ioctl$tiocgwinsz$nt(int fd, struct winsize *ws) {
   struct NtConsoleScreenBufferInfoEx sbinfo;
   fds[0] = fd, fds[1] = 1, fds[2] = 0;
   for (i = 0; i < ARRAYLEN(fds); ++i) {
-    if (isfdkind(fds[i], kFdFile) || isfdkind(fds[i], kFdConsole)) {
+    if (__isfdkind(fds[i], kFdFile) || __isfdkind(fds[i], kFdConsole)) {
       if (GetConsoleMode(g_fds.p[fds[i]].handle, &mode)) {
         memset(&sbinfo, 0, sizeof(sbinfo));
         sbinfo.cbSize = sizeof(sbinfo);
@@ -50,7 +50,7 @@ textwindows int ioctl$tiocgwinsz$nt(int fd, struct winsize *ws) {
           ws->ws_ypixel = 0;
           return 0;
         } else {
-          winerr();
+          __winerr();
         }
       } else {
         enotty();

libc/calls/ioctl-tiocswinsz-nt.c

@@ -29,10 +29,10 @@ textwindows int ioctl$tiocswinsz$nt(int fd, const struct winsize *ws) {
   uint32_t mode;
   struct NtCoord coord;
   if (!ws) return efault();
-  if (!isfdkind(fd, kFdFile)) return ebadf();
+  if (!__isfdkind(fd, kFdFile)) return ebadf();
   if (!GetConsoleMode(g_fds.p[fd].handle, &mode)) return enotty();
   coord.X = ws->ws_col;
   coord.Y = ws->ws_row;
-  if (!SetConsoleScreenBufferSize(g_fds.p[fd].handle, coord)) return winerr();
+  if (!SetConsoleScreenBufferSize(g_fds.p[fd].handle, coord)) return __winerr();
   return 0;
 }

libc/calls/isatty-nt.c

@@ -23,6 +23,6 @@
 #include "libc/sysv/errfuns.h"
 
 textwindows bool32 isatty$nt(int fd) {
-  if (!isfdkind(fd, kFdFile)) return ebadf();
+  if (!__isfdkind(fd, kFdFile)) return ebadf();
   return GetFileType(g_fds.p[fd].handle) == kNtFileTypeChar;
 }

libc/calls/ischardev.c

@@ -40,7 +40,7 @@ textstartup bool32 ischardev(int fd) {
       return false;
     }
   } else {
-    return isfdkind(fd, kFdFile) &&
+    return __isfdkind(fd, kFdFile) &&
            GetFileType(g_fds.p[fd].handle) == kNtFileTypeChar;
   }
 }

libc/calls/isfdkind.c

@@ -19,6 +19,6 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/internal.h"
 
-bool isfdkind(int fd, enum FdKind kind) {
+bool __isfdkind(int fd, enum FdKind kind) {
-  return isfdindex(fd) && g_fds.p[fd].kind == kind;
+  return 0 <= fd && fd < g_fds.n && g_fds.p[fd].kind == kind;
 }

libc/calls/isfdopen.c

@@ -19,6 +19,6 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/internal.h"
 
-bool isfdopen(int fd) {
+bool __isfdopen(int fd) {
-  return isfdindex(fd) && g_fds.p[fd].kind != kFdEmpty;
+  return 0 <= fd && fd < g_fds.n && g_fds.p[fd].kind != kFdEmpty;
 }

libc/calls/link-nt.c

@@ -17,10 +17,10 @@
 │ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA                │
 │ 02110-1301 USA                                                               │
 ╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/calls/calls.h"
+#include "libc/calls/internal.h"
 #include "libc/nt/files.h"
 #include "libc/nt/runtime.h"
-#include "libc/calls/internal.h"
-#include "libc/calls/calls.h"
 
 textwindows int link$nt(const char *existingpath, const char *newpath) {
   char16_t newpath16[PATH_MAX];
@@ -30,7 +30,7 @@ textwindows int link$nt(const char *existingpath, const char *newpath) {
     if (CreateHardLink(newpath16, existingpath16, NULL)) {
       return 0;
     } else {
-      return winerr();
+      return __winerr();
     }
   } else {
     return -1;

libc/calls/lseek-nt.c

@@ -23,10 +23,10 @@
 
 textwindows int64_t lseek$nt(int fd, int64_t offset, int whence) {
   int64_t res;
-  if (!isfdkind(fd, kFdFile)) return ebadf();
+  if (!__isfdkind(fd, kFdFile)) return ebadf();
   if (SetFilePointerEx(g_fds.p[fd].handle, offset, &res, whence)) {
     return res;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/madvise-nt.c

@@ -61,7 +61,7 @@ textwindows int madvise$nt(void *addr, size_t length, int advice) {
       if (fn(GetCurrentProcess(), &rangecount, ranges, 0)) {
         return 0;
       } else {
-        return winerr();
+        return __winerr();
       }
     } else {
       return enosys();
@@ -72,7 +72,7 @@ textwindows int madvise$nt(void *addr, size_t length, int advice) {
       if (fn(addr, length, kNtVmOfferPriorityNormal)) {
         return 0;
       } else {
-        return winerr();
+        return __winerr();
       }
     } else {
       return enosys();

libc/calls/mkdir.c

@@ -31,7 +31,7 @@ static textwindows noinline int mkdir$nt(const char *path, uint32_t mode) {
   if (CreateDirectory(path16, NULL)) {
     return 0;
   } else {
-    return winerr();
+    return __winerr();
   }
 }
 

libc/calls/mprotect.greg.c

@@ -55,7 +55,7 @@ int mprotect(void *addr, uint64_t len, int prot) {
     if (__imp_VirtualProtect(addr, len, prot2nt(prot, 0), &oldprot)) {
       return 0;
     } else {
-      return winerr();
+      return __winerr();
     }
   }
 }

libc/calls/nanosleep-xnu.c

@@ -22,7 +22,6 @@
 #include "libc/macros.h"
 #include "libc/nexgen32e/nexgen32e.h"
 #include "libc/sock/internal.h"
-#include "libc/sock/select.internal.h"
 
 int nanosleep$xnu(const struct timespec *req, struct timespec *rem) {
   long millis;

libc/calls/ntaccesscheck.c

@@ -81,7 +81,7 @@ textwindows int ntaccesscheck(const char16_t *pathname, uint32_t flags) {
       (result || flags == F_OK)) {
     rc = 0;
   } else {
-    rc = winerr();
+    rc = __winerr();
   }
   close(hImpersonatedToken);
   close(hToken);

libc/calls/open-nt.c

@@ -49,7 +49,7 @@ static textwindows int64_t open$nt$impl(const char *file, uint32_t flags,
            (flags & O_EXCL)
                ? kNtFileShareExclusive
                : kNtFileShareRead | kNtFileShareWrite | kNtFileShareDelete,
-           (flags & O_CLOEXEC) ? &kNtIsInheritable : NULL,
+           &kNtIsInheritable,
            (flags & O_CREAT) && (flags & O_EXCL)
                ? kNtCreateNew
                : (flags & O_CREAT) && (flags & O_TRUNC)
@@ -94,7 +94,7 @@ static textwindows ssize_t open$nt$console(const struct NtMagicPaths *mp,
         open$nt$impl(mp->conout, (flags & ~O_ACCMODE) | O_WRONLY, mode);
     assert(g_fds.p[fd].extra != -1);
   } else {
-    return winerr();
+    return __winerr();
   }
   g_fds.p[fd].kind = kFdConsole;
   g_fds.p[fd].flags = flags;
@@ -111,13 +111,13 @@ static textwindows ssize_t open$nt$file(const char *file, uint32_t flags,
              ((flags & O_CREAT) && (flags & O_TRUNC))) {
     return eisdir();
   } else {
-    return winerr();
+    return __winerr();
   }
 }
 
 textwindows ssize_t open$nt(const char *file, uint32_t flags, int32_t mode) {
   size_t fd;
-  if ((fd = createfd()) == -1) return -1;
+  if ((fd = __getemptyfd()) == -1) return -1;
   if ((flags & O_ACCMODE) == O_RDWR &&
       tinystrcmp(file, kNtMagicPaths.devtty) == 0) {
     return open$nt$console(&kNtMagicPaths, flags, mode, fd);

libc/calls/open.c

@@ -24,7 +24,7 @@
 #include "libc/str/str.h"
 #include "libc/sysv/consts/at.h"
 #include "libc/sysv/errfuns.h"
-#include "libc/zipos/zipos.h"
+#include "libc/zipos/zipos.internal.h"
 
 /**
  * Opens file.

libc/calls/openanon.c

@@ -61,24 +61,25 @@ static int openanon$impl(const char *name, unsigned flags,
                          char pathbuf[hasatleast PATH_MAX]) {
   int fd;
   openanon$genpath(name, state, pathbuf);
-  if (!IsWindows()) {
   flags |= O_RDWR | O_CREAT | O_EXCL | O_TRUNC;
+  if (!IsWindows()) {
     if ((fd = openat$sysv(AT_FDCWD, pathbuf, flags, 0600)) != -1) {
       unlink(pathbuf);
     }
     return fd;
   } else {
-    if ((fd = createfd()) != -1 &&
+    if ((fd = __getemptyfd()) != -1 &&
         (g_fds.p[fd].handle = CreateFileA(
              pathbuf, kNtGenericRead | kNtGenericWrite, kNtFileShareExclusive,
-             (flags & O_CLOEXEC) ? &kNtIsInheritable : NULL, kNtCreateAlways,
+             &kNtIsInheritable, kNtCreateAlways,
              (kNtFileAttributeNotContentIndexed | kNtFileAttributeNormal |
               kNtFileAttributeTemporary | kNtFileFlagDeleteOnClose),
              0)) != -1) {
       g_fds.p[fd].kind = kFdFile;
+      g_fds.p[fd].flags = flags;
       return fd;
     } else {
-      return winerr();
+      return __winerr();
     }
   }
 }

libc/calls/pipe-nt.c

@@ -24,11 +24,10 @@
 
 textwindows int pipe$nt(int pipefd[2], unsigned flags) {
   int reader, writer;
-  if ((reader = createfd()) == -1) return -1;
+  if ((reader = __getemptyfd()) == -1) return -1;
-  if ((writer = createfd()) == -1) return -1;
+  if ((writer = __getemptyfd()) == -1) return -1;
   if (CreatePipe(&g_fds.p[reader].handle, &g_fds.p[writer].handle,
-                 (flags & O_CLOEXEC) ? NULL : &kNtIsInheritable,
+                 &kNtIsInheritable, 0)) {
-                 0 /* let NT pick buffer size */)) {
     g_fds.p[reader].kind = kFdFile;
     g_fds.p[reader].flags = flags;
     g_fds.p[writer].kind = kFdFile;
@@ -37,6 +36,6 @@ textwindows int pipe$nt(int pipefd[2], unsigned flags) {
     pipefd[1] = writer;
     return 0;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/pread.c

@@ -26,7 +26,7 @@
 #include "libc/macros.h"
 #include "libc/runtime/runtime.h"
 #include "libc/sysv/errfuns.h"
-#include "libc/zipos/zipos.h"
+#include "libc/zipos/zipos.internal.h"
 
 /**
  * Reads from file at offset, thus avoiding superfluous lseek().
@@ -42,12 +42,12 @@
 ssize_t pread(int fd, void *buf, size_t size, int64_t offset) {
   ssize_t rc;
   if (fd == -1 || offset < 0) return einval();
-  if (isfdkind(fd, kFdZip)) {
+  if (__isfdkind(fd, kFdZip)) {
     rc = weaken(__zipos_read)(
         (struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, buf, size, offset);
   } else if (!IsWindows()) {
     rc = pread$sysv(fd, buf, size, offset);
-  } else if (isfdkind(fd, kFdFile)) {
+  } else if (__isfdkind(fd, kFdFile)) {
     rc = read$nt(&g_fds.p[fd], (struct iovec[]){{buf, size}}, 1, offset);
   } else {
     rc = ebadf();

libc/calls/pwrite.c

@@ -43,7 +43,7 @@ ssize_t pwrite(int fd, const void *buf, size_t size, int64_t offset) {
   size = MIN(size, 0x7ffff000);
   if (!IsWindows()) {
     rc = pwrite$sysv(fd, buf, size, offset);
-  } else if (isfdkind(fd, kFdFile)) {
+  } else if (__isfdkind(fd, kFdFile)) {
     rc = write$nt(&g_fds.p[fd], (struct iovec[]){{buf, size}}, 1, offset);
   } else {
     return ebadf();

libc/calls/raise.c

@@ -60,7 +60,7 @@ int raise(int sig) {
     if (GenerateConsoleCtrlEvent(GetCtrlEvent(sig), 0)) {
       return 0;
     } else {
-      return winerr();
+      return __winerr();
     }
   }
 }

libc/calls/read-nt.c

@@ -40,6 +40,6 @@ textwindows ssize_t read$nt(struct Fd *fd, const struct iovec *iov,
   } else if (NtGetErr() == kNtErrorBrokenPipe) {
     return 0; /* read() doesn't EPIPE lool */
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/read.c

@@ -17,17 +17,8 @@
 │ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA                │
 │ 02110-1301 USA                                                               │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/assert.h"
-#include "libc/bits/weaken.h"
-#include "libc/calls/calls.h"
-#include "libc/calls/internal.h"
 #include "libc/calls/struct/iovec.h"
-#include "libc/dce.h"
+#include "libc/sock/sock.h"
-#include "libc/macros.h"
-#include "libc/runtime/runtime.h"
-#include "libc/sock/internal.h"
-#include "libc/sysv/errfuns.h"
-#include "libc/zipos/zipos.h"
 
 /**
  * Reads data from file descriptor.
@@ -41,24 +32,5 @@
  * @asyncsignalsafe
  */
 ssize_t read(int fd, void *buf, size_t size) {
-  ssize_t rc;
+  return readv(fd, &(struct iovec){buf, size}, 1);
-  if (fd == -1) return einval();
-  if (isfdkind(fd, kFdZip)) {
-    rc =
-        weaken(__zipos_read)((struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle,
-                             (struct iovec[]){{buf, size}}, 1, -1);
-  } else if (!IsWindows()) {
-    rc = read$sysv(fd, buf, size);
-  } else if (isfdkind(fd, kFdFile) || isfdkind(fd, kFdConsole)) {
-    rc = read$nt(&g_fds.p[fd], (struct iovec[]){{buf, size}}, 1, -1);
-  } else if (isfdkind(fd, kFdSocket)) {
-    rc = weaken(recvfrom$nt)(&g_fds.p[fd], (struct iovec[]){{buf, size}}, 1, 0,
-                             NULL, NULL);
-  } else {
-    rc = ebadf();
-  }
-  if (!IsTrustworthy() && rc != -1) {
-    if ((size_t)rc > size) abort();
-  }
-  return rc;
 }

libc/calls/readv-serial.c

@@ -0,0 +1,56 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ This program is free software; you can redistribute it and/or modify         │
+│ it under the terms of the GNU General Public License as published by         │
+│ the Free Software Foundation; version 2 of the License.                      │
+│                                                                              │
+│ This program is distributed in the hope that it will be useful, but          │
+│ WITHOUT ANY WARRANTY; without even the implied warranty of                   │
+│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU             │
+│ General Public License for more details.                                     │
+│                                                                              │
+│ You should have received a copy of the GNU General Public License            │
+│ along with this program; if not, write to the Free Software                  │
+│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA                │
+│ 02110-1301 USA                                                               │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "ape/lib/pc.h"
+#include "libc/calls/internal.h"
+#include "libc/nexgen32e/uart.internal.h"
+
+static bool IsDataAvailable(struct Fd *fd) {
+  return inb(fd->handle + UART_LSR) & UART_TTYDA;
+}
+
+static int GetFirstIov(struct iovec *iov, int iovlen) {
+  int i;
+  for (i = 0; i < iovlen; ++i) {
+    if (iov[i].iov_len) {
+      return i;
+    }
+  }
+  return -1;
+}
+
+ssize_t readv$serial(struct Fd *fd, const struct iovec *iov, int iovlen) {
+  size_t i, j, got = 0;
+  if ((i = GetFirstIov(iov, iovlen)) != -1) {
+    while (!IsDataAvailable(fd)) asm("pause");
+    i = 0;
+    j = 0;
+    do {
+      ++got;
+      ((char *)iov[i].iov_base)[j] = inb(fd->handle);
+      if (++j == iov[i].iov_len) {
+        j = 0;
+        if (++i == iovlen) {
+          break;
+        }
+      }
+    } while (IsDataAvailable(fd));
+  }
+  return got;
+}

libc/calls/readv.c

@@ -23,7 +23,7 @@
 #include "libc/calls/struct/iovec.h"
 #include "libc/sock/internal.h"
 #include "libc/sysv/errfuns.h"
-#include "libc/zipos/zipos.h"
+#include "libc/zipos/zipos.internal.h"
 
 /**
  * Reads data to multiple buffers.
@@ -31,19 +31,19 @@
  * @return number of bytes actually read, or -1 w/ errno
  */
 ssize_t readv(int fd, const struct iovec *iov, int iovlen) {
-  if (!IsTrustworthy()) {
+  if (fd < 0) return einval();
-    if (fd == -1) return einval();
   if (iovlen < 0) return einval();
-  }
+  if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
-  if (isfdkind(fd, kFdZip)) {
     return weaken(__zipos_read)(
         (struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, iov, iovlen, -1);
-  }
+  } else if (fd < g_fds.n && g_fds.p[fd].kind == kFdSerial) {
-  if (!IsWindows()) {
+    return readv$serial(&g_fds.p[fd], iov, iovlen);
+  } else if (!IsWindows()) {
     return readv$sysv(fd, iov, iovlen);
-  } else if (isfdkind(fd, kFdFile) || isfdkind(fd, kFdConsole)) {
+  } else if (fd < g_fds.n &&
+             (g_fds.p[fd].kind == kFdFile || g_fds.p[fd].kind == kFdConsole)) {
     return read$nt(&g_fds.p[fd], iov, iovlen, -1);
-  } else if (isfdkind(fd, kFdSocket)) {
+  } else if (fd < g_fds.n && (g_fds.p[fd].kind == kFdSocket)) {
     return weaken(recvfrom$nt)(&g_fds.p[fd], iov, iovlen, 0, NULL, 0);
   } else {
     return ebadf();

libc/calls/removefd.c

@@ -20,8 +20,8 @@
 #include "libc/calls/internal.h"
 #include "libc/macros.h"
 
-void removefd(int fd) {
+void __removefd(int fd) {
-  if (isfdopen(fd)) {
+  if (__isfdopen(fd)) {
     g_fds.p[fd].kind = kFdEmpty;
     g_fds.f = MIN(g_fds.f, fd);
   }

libc/calls/rename-nt.c

@@ -34,6 +34,6 @@ textwindows int rename$nt(const char *oldpath, const char *newpath) {
   if (MoveFileEx(oldpath16, newpath16, kNtMovefileReplaceExisting)) {
     return 0;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/rmdir-nt.c

@@ -27,6 +27,6 @@ textwindows int rmdir$nt(const char *path) {
   if (RemoveDirectory(path16)) {
     return 0;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/sched_setaffinity.c

@@ -56,7 +56,7 @@ static textwindows noinline int sched_setaffinity$nt(int pid,
       }
     }
   }
-  rc = SetAffinityMask(handle ? handle : pid, mask) ? 0 : winerr();
+  rc = SetAffinityMask(handle ? handle : pid, mask) ? 0 : __winerr();
   if (handle) CloseHandle(handle);
   return rc;
 }

libc/calls/setitimer-nt.c

@@ -69,7 +69,7 @@ textwindows int setitimer$nt(int which, const struct itimerval *newvalue,
   if (newvalue) {
     if (newvalue->it_value.tv_sec && newvalue->it_value.tv_usec) {
       if (!(ith = CreateWaitableTimer(NULL, false, NULL))) {
-        return winerr();
+        return __winerr();
       }
       duetime = -(newvalue->it_value.tv_sec * HECTONANOSECONDS +
                   newvalue->it_value.tv_usec * 10);

libc/calls/setpriority-nt.c

@@ -48,6 +48,6 @@ textwindows int setpriority$nt(int nice) {
       SetThreadPriority(GetCurrentThread(), p.wut)) {
     return p.nice;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/sigaction.c

@@ -81,7 +81,7 @@ static void sigaction$cosmo2native(union metasigaction *sa) {
                  sa_mask);
       break;
     default:
-      abort();
+      break;
   }
 }
 
@@ -105,7 +105,7 @@ static void sigaction$native2cosmo(union metasigaction *sa) {
                  sa_mask);
       break;
     default:
-      abort();
+      break;
   }
 }
 

libc/calls/stat-nt.c

@@ -41,6 +41,6 @@ textwindows int stat$nt(const char *path, struct stat *st) {
     CloseHandle(fh);
     return rc;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/stat.c

@@ -24,7 +24,7 @@
 #include "libc/str/str.h"
 #include "libc/sysv/consts/at.h"
 #include "libc/sysv/errfuns.h"
-#include "libc/zipos/zipos.h"
+#include "libc/zipos/zipos.internal.h"
 
 /**
  * Returns information about thing.

libc/calls/symlink-nt.c

@@ -29,6 +29,6 @@ textwindows int symlink$nt(const char *target, const char *linkpath) {
   if (CreateSymbolicLink(linkpath16, target16, flags)) {
     return 0;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/sysinfo-nt.c

@@ -34,6 +34,6 @@ textwindows int sysinfo$nt(struct sysinfo *info) {
     info->mem_unit = 1;
     return 0;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/truncate-nt.c

@@ -36,5 +36,5 @@ textwindows int truncate$nt(const char *path, uint64_t length) {
     CloseHandle(fh);
     if (ok) return 0;
   }
-  return winerr();
+  return __winerr();
 }

libc/calls/unlink-nt.c

@@ -27,6 +27,6 @@ textwindows int unlink$nt(const char *name) {
   if (DeleteFile(name16)) {
     return 0;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/utimensat-nt.c

@@ -48,7 +48,7 @@ textwindows int utimensat$nt(int dirfd, const char *path,
           -1) {
         closeme = true;
       } else {
-        return winerr();
+        return __winerr();
       }
     } else {
       return einval();
@@ -77,7 +77,7 @@ textwindows int utimensat$nt(int dirfd, const char *path,
   if (SetFileTime(fh, NULL, ftp[0], ftp[1])) {
     rc = 0;
   } else {
-    rc = winerr();
+    rc = __winerr();
   }
   if (closeme) {
     CloseHandle(fh);

libc/calls/wait4-nt.c

@@ -41,7 +41,7 @@ textwindows int wait4$nt(int pid, int *opt_out_wstatus, int options,
   uint32_t i, count, timeout;
   struct NtFileTime createfiletime, exitfiletime, kernelfiletime, userfiletime;
   if (pid != -1) {
-    if (!isfdkind(pid, kFdProcess)) {
+    if (!__isfdkind(pid, kFdProcess)) {
       return echild();
     }
     handles[0] = g_fds.p[pid].handle;
@@ -67,8 +67,8 @@ textwindows int wait4$nt(int pid, int *opt_out_wstatus, int options,
     } else {
       i = WaitForMultipleObjects(count, handles, false, -1);
     }
-    if (i == kNtWaitFailed) return winerr();
+    if (i == kNtWaitFailed) return __winerr();
-    if (!GetExitCodeProcess(handles[i], &dwExitCode)) return winerr();
+    if (!GetExitCodeProcess(handles[i], &dwExitCode)) return __winerr();
     if (dwExitCode == kNtStillActive) continue;
     if (opt_out_wstatus) { /* @see WEXITSTATUS() */
       *opt_out_wstatus = (dwExitCode & 0xff) << 8;
@@ -80,6 +80,8 @@ textwindows int wait4$nt(int pid, int *opt_out_wstatus, int options,
       FileTimeToTimeVal(&opt_out_rusage->ru_utime, userfiletime);
       FileTimeToTimeVal(&opt_out_rusage->ru_stime, kernelfiletime);
     }
+    CloseHandle(g_fds.p[pids[i]].handle);
+    g_fds.p[pids[i]].kind = kFdEmpty;
     return pids[i];
   }
 }

libc/calls/winerr.greg.c

@@ -29,7 +29,7 @@
  * @return -1 w/ few exceptions
  * @note this is a code-size saving device
  */
-privileged int64_t winerr(void) {
+privileged int64_t __winerr(void) {
   if (IsWindows()) {
     errno = GetLastError();
     return -1;

libc/calls/write-nt.c

@@ -46,6 +46,6 @@ textwindows ssize_t write$nt(struct Fd *fd, const struct iovec *iov,
     FlushFileBuffers(fd->handle);
     return wrote;
   } else {
-    return winerr();
+    return __winerr();
   }
 }

libc/calls/write.c

@@ -17,15 +17,8 @@
 │ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA                │
 │ 02110-1301 USA                                                               │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/assert.h"
-#include "libc/bits/weaken.h"
-#include "libc/calls/calls.h"
-#include "libc/calls/internal.h"
 #include "libc/calls/struct/iovec.h"
-#include "libc/dce.h"
+#include "libc/sock/sock.h"
-#include "libc/sock/internal.h"
-#include "libc/sysv/errfuns.h"
-#include "libc/zipos/zipos.h"
 
 /**
  * Writes data to file descriptor.
@@ -39,34 +32,5 @@
  * @asyncsignalsafe
  */
 ssize_t write(int fd, const void *buf, size_t size) {
-  ssize_t rc;
+  return writev(fd, &(struct iovec){buf, size}, 1);
-  size_t wrote;
-  if (fd == -1) return einval();
-  if (isfdkind(fd, kFdZip)) {
-    rc = weaken(__zipos_write)(
-        (struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle,
-        (struct iovec[]){{buf, size}}, 1, -1);
-  } else if (!IsWindows()) {
-    rc = write$sysv(fd, buf, size);
-  } else if (isfdkind(fd, kFdSocket)) {
-    rc = weaken(sendto$nt)(&g_fds.p[fd], (struct iovec[]){{buf, size}}, 1, 0,
-                           NULL, 0);
-  } else if (isfdkind(fd, kFdFile) || isfdkind(fd, kFdConsole)) {
-    rc = write$nt(&g_fds.p[fd], (struct iovec[]){{buf, size}}, 1, -1);
-  } else {
-    return ebadf();
-  }
-  if (rc != -1) {
-    wrote = (size_t)rc;
-    if (wrote == 0) {
-      assert(size == 0);
-    } else {
-      assert(wrote <= size);
-    }
-  }
-  if (!IsTrustworthy() && rc != -1) {
-    if (!rc && size) abort();
-    if ((size_t)rc > size) abort();
-  }
-  return rc;
 }

libc/calls/writev-serial.c

@@ -18,39 +18,17 @@
 │ 02110-1301 USA                                                               │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "ape/lib/pc.h"
+#include "libc/calls/internal.h"
 #include "libc/nexgen32e/uart.internal.h"
-#include "libc/stdio/internal.h"
-#include "libc/stdio/stdio.h"
 
-static void fin(FILE *f) {
+ssize_t writev$serial(struct Fd *fd, const struct iovec *iov, int iovlen) {
-  f->buf[f->end] = inb(0x3F8);
+  size_t i, j, wrote = 0;
-  f->end = (f->end + 1) & (f->size - 1);
+  for (i = 0; i < iovlen; ++i) {
-}
+    for (j = 0; j < iov[i].iov_len; ++j) {
-
+      while (!(inb(fd->handle + UART_LSR) & UART_TTYTXR)) asm("pause");
-static void fout(FILE *f) {
+      outb(fd->handle, ((char *)iov[i].iov_base)[j]);
-  outb(0x3F8, f->buf[f->beg]);
+      ++wrote;
-  f->beg = (f->beg + 1) & (f->size - 1);
-}
-
-static int serialstdio(FILE *f, unsigned char status, void action(FILE *)) {
-  int block = 1;
-  unsigned tally = 0;
-  while (f->end != f->beg) {
-    if (!(inb(0x3F8 + UART_LSR) & status)) {
-      if (!block) break;
-      asm("pause");
-    } else {
-      action(f);
-      tally++;
     }
   }
-  return (int)tally;
+  return wrote;
-}
-
-int fsreadbuf(FILE *f) {
-  return serialstdio(f, UART_TTYDA, fin);
-}
-
-int fswritebuf(FILE *f) {
-  return serialstdio(f, UART_TTYTXR, fout);
 }

libc/calls/writev.c

@@ -22,7 +22,7 @@
 #include "libc/calls/internal.h"
 #include "libc/sock/internal.h"
 #include "libc/sysv/errfuns.h"
-#include "libc/zipos/zipos.h"
+#include "libc/zipos/zipos.internal.h"
 
 /**
  * Writes data from multiple buffers.
@@ -35,19 +35,19 @@
  * @return number of bytes actually handed off, or -1 w/ errno
  */
 ssize_t writev(int fd, const struct iovec *iov, int iovlen) {
-  if (!IsTrustworthy()) {
+  if (fd < 0) return einval();
-    if (fd == -1) return einval();
   if (iovlen < 0) return einval();
-  }
+  if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
-  if (isfdkind(fd, kFdZip)) {
     return weaken(__zipos_write)(
         (struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, iov, iovlen, -1);
-  }
+  } else if (fd < g_fds.n && g_fds.p[fd].kind == kFdSerial) {
-  if (!IsWindows()) {
+    return writev$serial(&g_fds.p[fd], iov, iovlen);
+  } else if (!IsWindows()) {
     return writev$sysv(fd, iov, iovlen);
-  } else if (isfdkind(fd, kFdFile) || isfdkind(fd, kFdConsole)) {
+  } else if (fd < g_fds.n &&
+             (g_fds.p[fd].kind == kFdFile || g_fds.p[fd].kind == kFdConsole)) {
     return write$nt(&g_fds.p[fd], iov, iovlen, -1);
-  } else if (isfdkind(fd, kFdSocket)) {
+  } else if (fd < g_fds.n && g_fds.p[fd].kind == kFdSocket) {
     return weaken(sendto$nt)(&g_fds.p[fd], iov, iovlen, 0, NULL, 0);
   } else {
     return ebadf();

libc/dns/getntnameservers.c

@@ -82,7 +82,7 @@ textwindows int getntnameservers(struct ResolvConf *resolv) {
       }
     }
   } else {
-    rc = winerr();
+    rc = __winerr();
   }
   RegCloseKey(hkInterfaces);
   return rc;

libc/fmt/fmt.h

@@ -24,7 +24,8 @@ int vsprintf(char *, const char *, va_list)
     paramsnonnull((2)) nothrow nocallback frownedupon(vsnprintf);
 int sscanf(const char *, const char *, ...) scanfesque(2);
 int vsscanf(const char *, const char *, va_list);
-int vcscanf(int callback(void *), void *, const char *, va_list);
+int vcscanf(int (*)(void *), int (*)(int, void *), void *, const char *,
+            va_list);
 char *strerror(int) returnsnonnull nothrow nocallback;
 int strerror_r(int, char *, size_t) nothrow nocallback;
 int palandprintf(void *, void *, const char *, va_list) hidden;

libc/fmt/vcscanf.c

@@ -44,7 +44,8 @@
  * @param va points to the variadic argument state
  * @see libc/fmt/pflink.h (dynamic memory is not a requirement)
  */
-int vcscanf(int callback(void *), void *arg, const char *fmt, va_list va) {
+int vcscanf(int callback(void *), int unget(int, void *), void *arg,
+            const char *fmt, va_list va) {
   struct FreeMe {
     struct FreeMe *next;
     void *ptr;
@@ -56,13 +57,18 @@ int vcscanf(int callback(void *), void *arg, const char *fmt, va_list va) {
   while (c != -1) {
     switch (p[i++]) {
       case '\0':
-        return items;
+        if (c != -1 && unget) {
+          unget(c, arg);
+        }
+        goto Done;
       case ' ':
       case '\t':
       case '\n':
       case '\r':
       case '\v':
-        while (isspace(c)) c = callback(arg);
+        while (isspace(c)) {
+          c = callback(arg);
+        }
         break;
       case '%': {
         uintmax_t number;

libc/fmt/vsscanf.c

@@ -47,5 +47,5 @@ static int vsscanfcb(void *arg) {
  */
 int(vsscanf)(const char *str, const char *fmt, va_list va) {
   struct StringScannerState state = {(const unsigned char *)str, 0};
-  return vcscanf(vsscanfcb, &state, fmt, va);
+  return vcscanf(vsscanfcb, NULL, &state, fmt, va);
 }

libc/isystem/windows.h

@@ -165,6 +165,7 @@
 #define DWORDLONG      ULONGLONG
 #define PDWORDLONG     DWORDLONG*
 #define LARGE_INTEGER  int64_t
+#define PLARGE_INTEGER int64_t*
 
 #define ULONG        uint32_t
 #define PULONG       ULONG*
@@ -1273,9 +1274,9 @@
 #define WSAPROTOCOL_INFO   struct NtWsaProtocolInfo
 #define LPWSAPROTOCOL_INFO struct NtWsaProtocolInfo*
 
-#define _WSABUF  iovec$nt
+#define _WSABUF  NtIovec
-#define WSABUF   struct iovec$nt
+#define WSABUF   struct NtIovec
-#define LPWSABUF struct iovec$nt*
+#define LPWSABUF struct NtIovec*
 
 #define _GUID  NtGuid
 #define GUID   struct NtGuid
@@ -1320,9 +1321,9 @@
 #define SD_SEND    SHUT_WR
 #define SD_BOTH    SHUT_RDWR
 
-#define WSAMSG   struct msghdr$nt
+#define WSAMSG   struct NtMsgHdr
-#define PWSAMSG  struct msghdr$nt*
+#define PWSAMSG  struct NtMsgHdr*
-#define LPWSAMSG struct msghdr$nt*
+#define LPWSAMSG struct NtMsgHdr*
 
 #define _MEMORYSTATUSEX  NtMemoryStatusEx
 #define MEMORYSTATUSEX   struct NtMemoryStatusEx

libc/libc.mk

@@ -4,7 +4,7 @@
 PKGS += LIBC
 
 LIBC_HDRS = $(filter %.h,$(LIBC_FILES))
-LIBC_FILES := $(wildcard libc/*) $(wildcard libc/internal/*)
+LIBC_FILES := $(wildcard libc/*)
 LIBC_CHECKS = $(LIBC_HDRS:%=o/$(MODE)/%.ok)
 
 .PHONY:		o/$(MODE)/libc

libc/nexgen32e/uart.internal.h

@@ -1,24 +1,7 @@
 #ifndef COSMOPOLITAN_LIBC_NEXGEN32E_UART_H_
 #define COSMOPOLITAN_LIBC_NEXGEN32E_UART_H_
 
-/**
+#define COM1        0x0
- * @fileoverview PC Serial Line Helpers (8250 UART 16550+).
- *
- * <p>These functions provide the baseline of PC telecommunications
- * support that doesn't require switching context or cpu mode.
- *
- * <p>Example use cases:
- * <ul>
- * <li>Qemu stdio
- * <li>Bare metal stdio
- * <li>FIPS-170-2 SSH alternative
- * <li>NIC for key-signing servers
- * </ul>
- *
- * @see www.lammertbies.nl/comm/info/serial-uart.html
- */
-
-#define COM1        0x0 /* offset in pc bios data area with port number (0x400) */
 #define COM2        0x2
 #define COM3        0x4
 #define COM4        0x6
@@ -40,16 +23,4 @@
 #define UART_TTYIDL (1 << 6) /* serial thr empty and line idle */
 #define UART_TTYEDF (1 << 7) /* erroneous data in fifo */
 
-#if !(__ASSEMBLER__ + __LINKER__ + 0)
-COSMOPOLITAN_C_START_
-
-void sinit(unsigned short *ports, unsigned count, const char *config);
-void sputc(unsigned char ch, int port);
-int sgetc(int port);
-void sputs(const char *s, int port);
-void sflush(unsigned short *ports, unsigned count);
-unsigned char slsr(int port);
-
-COSMOPOLITAN_C_END_
-#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
 #endif /* COSMOPOLITAN_LIBC_NEXGEN32E_UART_H_ */

libc/nt/KernelBase/AcquireSRWLockExclusive.s

@@ -0,0 +1,15 @@
+.include "o/libc/nt/codegen.inc"
+.imp	KernelBase,__imp_AcquireSRWLockExclusive,AcquireSRWLockExclusive,683
+
+	.text.windows
+AcquireSRWLockExclusive:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	%rdi,%rcx
+	sub	$32,%rsp
+	call	*__imp_AcquireSRWLockExclusive(%rip)
+	leave
+	ret
+	.endfn	AcquireSRWLockExclusive,globl
+	.previous

libc/nt/KernelBase/AcquireSRWLockShared.s

@@ -0,0 +1,15 @@
+.include "o/libc/nt/codegen.inc"
+.imp	KernelBase,__imp_AcquireSRWLockShared,AcquireSRWLockShared,684
+
+	.text.windows
+AcquireSRWLockShared:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	%rdi,%rcx
+	sub	$32,%rsp
+	call	*__imp_AcquireSRWLockShared(%rip)
+	leave
+	ret
+	.endfn	AcquireSRWLockShared,globl
+	.previous

libc/nt/KernelBase/DeleteCriticalSection.s

@@ -0,0 +1,15 @@
+.include "o/libc/nt/codegen.inc"
+.imp	KernelBase,__imp_DeleteCriticalSection,DeleteCriticalSection,0
+
+	.text.windows
+DeleteCriticalSection:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	%rdi,%rcx
+	sub	$32,%rsp
+	call	*__imp_DeleteCriticalSection(%rip)
+	leave
+	ret
+	.endfn	DeleteCriticalSection,globl
+	.previous

libc/nt/KernelBase/EnterCriticalSection.s

@@ -0,0 +1,15 @@
+.include "o/libc/nt/codegen.inc"
+.imp	KernelBase,__imp_EnterCriticalSection,EnterCriticalSection,0
+
+	.text.windows
+EnterCriticalSection:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	%rdi,%rcx
+	sub	$32,%rsp
+	call	*__imp_EnterCriticalSection(%rip)
+	leave
+	ret
+	.endfn	EnterCriticalSection,globl
+	.previous

libc/nt/KernelBase/GetTickCount64.s

@@ -1,2 +1,14 @@
 .include "o/libc/nt/codegen.inc"
 .imp	KernelBase,__imp_GetTickCount64,GetTickCount64,780
+
+	.text.windows
+GetTickCount64:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	sub	$32,%rsp
+	call	*__imp_GetTickCount64(%rip)
+	leave
+	ret
+	.endfn	GetTickCount64,globl
+	.previous

libc/nt/KernelBase/InitializeCriticalSection.s

@@ -0,0 +1,15 @@
+.include "o/libc/nt/codegen.inc"
+.imp	KernelBase,__imp_InitializeCriticalSection,InitializeCriticalSection,0
+
+	.text.windows
+InitializeCriticalSection:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	%rdi,%rcx
+	sub	$32,%rsp
+	call	*__imp_InitializeCriticalSection(%rip)
+	leave
+	ret
+	.endfn	InitializeCriticalSection,globl
+	.previous

libc/nt/KernelBase/InitializeCriticalSectionAndSpinCount.s

@@ -1,5 +1,5 @@
 .include "o/libc/nt/codegen.inc"
-.imp	KernelBase,__imp_InitializeCriticalSectionAndSpinCount,InitializeCriticalSectionAndSpinCount,856
+.imp	KernelBase,__imp_InitializeCriticalSectionAndSpinCount,InitializeCriticalSectionAndSpinCount,0
 
 	.text.windows
 InitializeCriticalSectionAndSpinCount:

libc/nt/KernelBase/InitializeSRWLock.s

@@ -0,0 +1,15 @@
+.include "o/libc/nt/codegen.inc"
+.imp	KernelBase,__imp_InitializeSRWLock,InitializeSRWLock,1128
+
+	.text.windows
+InitializeSRWLock:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	%rdi,%rcx
+	sub	$32,%rsp
+	call	*__imp_InitializeSRWLock(%rip)
+	leave
+	ret
+	.endfn	InitializeSRWLock,globl
+	.previous

libc/nt/KernelBase/LeaveCriticalSection.s

@@ -0,0 +1,15 @@
+.include "o/libc/nt/codegen.inc"
+.imp	KernelBase,__imp_LeaveCriticalSection,LeaveCriticalSection,0
+
+	.text.windows
+LeaveCriticalSection:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	%rdi,%rcx
+	sub	$32,%rsp
+	call	*__imp_LeaveCriticalSection(%rip)
+	leave
+	ret
+	.endfn	LeaveCriticalSection,globl
+	.previous

libc/nt/KernelBase/ReleaseSRWLockExclusive.s

@@ -0,0 +1,15 @@
+.include "o/libc/nt/codegen.inc"
+.imp	KernelBase,__imp_ReleaseSRWLockExclusive,ReleaseSRWLockExclusive,1341
+
+	.text.windows
+ReleaseSRWLockExclusive:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	%rdi,%rcx
+	sub	$32,%rsp
+	call	*__imp_ReleaseSRWLockExclusive(%rip)
+	leave
+	ret
+	.endfn	ReleaseSRWLockExclusive,globl
+	.previous

libc/nt/KernelBase/ReleaseSRWLockShared.s

@@ -0,0 +1,15 @@
+.include "o/libc/nt/codegen.inc"
+.imp	KernelBase,__imp_ReleaseSRWLockShared,ReleaseSRWLockShared,1342
+
+	.text.windows
+ReleaseSRWLockShared:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	%rdi,%rcx
+	sub	$32,%rsp
+	call	*__imp_ReleaseSRWLockShared(%rip)
+	leave
+	ret
+	.endfn	ReleaseSRWLockShared,globl
+	.previous

libc/nt/KernelBase/SetCriticalSectionSpinCount.s

@@ -0,0 +1,12 @@
+.include "o/libc/nt/codegen.inc"
+.imp	KernelBase,__imp_SetCriticalSectionSpinCount,SetCriticalSectionSpinCount,0
+
+	.text.windows
+SetCriticalSectionSpinCount:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	__imp_SetCriticalSectionSpinCount(%rip),%rax
+	jmp	__sysv2nt
+	.endfn	SetCriticalSectionSpinCount,globl
+	.previous

libc/nt/KernelBase/TryAcquireSRWLockExclusive.s

@@ -0,0 +1,15 @@
+.include "o/libc/nt/codegen.inc"
+.imp	KernelBase,__imp_TryAcquireSRWLockExclusive,TryAcquireSRWLockExclusive,1467
+
+	.text.windows
+TryAcquireSRWLockExclusive:
+	push	%rbp
+	mov	%rsp,%rbp
+	.profilable
+	mov	%rdi,%rcx
+	sub	$32,%rsp
+	call	*__imp_TryAcquireSRWLockExclusive(%rip)
+	leave
+	ret
+	.endfn	TryAcquireSRWLockExclusive,globl
+	.previous