102 lines
4.8 KiB
C
102 lines
4.8 KiB
C
/*-*- 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 │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/bits/safemacros.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/nt/winsock.h"
|
|
#include "libc/sock/internal.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
static textwindows ssize_t sendfile$linux2nt(int outfd, int infd,
|
|
int64_t *inout_opt_inoffset,
|
|
size_t uptobytes) {
|
|
struct NtOverlapped Overlapped;
|
|
struct NtOverlapped *lpOverlapped;
|
|
if (!__isfdkind(outfd, kFdSocket) || !__isfdkind(outfd, kFdFile))
|
|
return ebadf();
|
|
if (inout_opt_inoffset) {
|
|
memset(&Overlapped, 0, sizeof(Overlapped));
|
|
Overlapped.Pointer = (void *)(intptr_t)(*inout_opt_inoffset);
|
|
lpOverlapped = &Overlapped;
|
|
} else {
|
|
lpOverlapped = NULL;
|
|
}
|
|
/* TODO(jart): Fetch this on a per-socket basis via GUID. */
|
|
if (TransmitFile(g_fds.p[outfd].handle, g_fds.p[infd].handle, uptobytes, 0,
|
|
lpOverlapped, NULL, 0)) {
|
|
return uptobytes;
|
|
} else {
|
|
return __winsockerr();
|
|
}
|
|
}
|
|
|
|
static ssize_t sendfile$linux2netflix(int outfd, int infd,
|
|
int64_t *inout_opt_inoffset,
|
|
size_t uptobytes) {
|
|
int sendfile$netflix(int32_t infd, int32_t outfd, int64_t offset,
|
|
size_t nbytes, const void *opt_hdtr,
|
|
int64_t *out_opt_sbytes,
|
|
int32_t flags) asm("sendfile$sysv") hidden;
|
|
int rc;
|
|
int64_t offset, sbytes;
|
|
if (inout_opt_inoffset) {
|
|
offset = *inout_opt_inoffset;
|
|
} else if ((offset = lseek$sysv(infd, 0, SEEK_CUR)) == -1) {
|
|
return -1;
|
|
}
|
|
if ((rc = sendfile$netflix(infd, outfd, offset, uptobytes, NULL, &sbytes,
|
|
0)) != -1) {
|
|
if (inout_opt_inoffset) *inout_opt_inoffset += sbytes;
|
|
return sbytes;
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Transfers data from file to network.
|
|
*
|
|
* @param outfd needs to be a socket
|
|
* @param infd needs to be a file
|
|
* @param inout_opt_inoffset may be specified for pread()-like behavior
|
|
* @param uptobytes is usually the number of bytes remaining in file; it
|
|
* can't exceed INT_MAX-1; some platforms block until everything's
|
|
* sent, whereas others won't; zero isn't allowed
|
|
* @return number of bytes transmitted which may be fewer than requested
|
|
* @see copy_file_range() for file ↔ file
|
|
* @see splice() for fd ↔ pipe
|
|
*/
|
|
ssize_t sendfile(int outfd, int infd, int64_t *inout_opt_inoffset,
|
|
size_t uptobytes) {
|
|
if (!uptobytes) return einval();
|
|
if (uptobytes > 0x7ffffffe /* Microsoft's off-by-one */) return eoverflow();
|
|
if (IsModeDbg() && uptobytes > 1) uptobytes >>= 1;
|
|
if (IsLinux()) {
|
|
return sendfile$sysv(outfd, infd, inout_opt_inoffset, uptobytes);
|
|
} else if (IsFreebsd() || IsXnu()) {
|
|
return sendfile$linux2netflix(outfd, infd, inout_opt_inoffset, uptobytes);
|
|
} else if (IsWindows()) {
|
|
return sendfile$linux2nt(outfd, infd, inout_opt_inoffset, uptobytes);
|
|
} else {
|
|
return copyfd(infd, inout_opt_inoffset, outfd, NULL, uptobytes, 0);
|
|
}
|
|
}
|