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/*-*- 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 "libc/bits/weaken.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/mem/mem.h"
#include "libc/nt/accounting.h"
#include "libc/nt/enum/startf.h"
#include "libc/nt/enum/status.h"
#include "libc/nt/process.h"
#include "libc/nt/runtime.h"
#include "libc/nt/struct/processinformation.h"
#include "libc/nt/synchronization.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/fileno.h"
#include "libc/sysv/errfuns.h"
#define SHELL_BIN "/bin/sh"
#define SHELL_ARG "-c"
#define CMD_C "CMD /C "
static int system$sysv(const char *cmdline) {
int rc, n, wstatus;
struct mem {
char shell[sizeof(SHELL_BIN)];
char arg[sizeof(SHELL_ARG)];
char *args[4];
char cmdline[];
} * mem;
if (cmdline != NULL) {
mem = malloc(sizeof(struct mem) + (strlen(cmdline) + 1));
if (!mem) return enomem();
strcpy(mem->shell, SHELL_BIN);
strcpy(mem->arg, SHELL_ARG);
mem->args[0] = mem->shell;
mem->args[1] = mem->arg;
mem->args[2] = mem->cmdline;
mem->args[3] = NULL;
strcpy(mem->cmdline, cmdline);
if ((rc = vfork()) != -1) {
if (rc == 0) {
execve$sysv(mem->shell, mem->args, environ);
abort();
}
if ((rc = wait4$sysv(rc, &wstatus, 0, NULL)) != -1) {
rc = wstatus;
}
}
free(mem);
return rc;
} else {
return fileexists(SHELL_BIN);
}
}
static textwindows noinline int system$nt(const char *cmdline) {
char *mem;
int rc, status;
uint32_t dwExitCode;
struct NtStartupInfo startinfo;
struct NtProcessInformation *info;
uint16_t *cmdline16, *quotedcmdline16;
unsigned len, dosquotemultiplier, cmdline16bytes, quotedcmdline16bytes;
if (cmdline != NULL) {
rc = -1;
dosquotemultiplier = 2;
len = strlen(cmdline);
cmdline16bytes = (len + 1) * sizeof(uint16_t);
quotedcmdline16bytes =
strlen(CMD_C) * sizeof(uint16_t) + cmdline16bytes * dosquotemultiplier;
if (!(mem = malloc(sizeof(struct NtProcessInformation) + cmdline16bytes +
quotedcmdline16bytes))) {
return enomem();
}
info = (struct NtProcessInformation *)mem;
cmdline16 = (uint16_t *)(mem + sizeof(struct NtProcessInformation));
quotedcmdline16 = (uint16_t *)(mem + sizeof(struct NtProcessInformation) +
cmdline16bytes);
strcpyzbw(cmdline16, cmdline);
strcpyzbw(quotedcmdline16, CMD_C);
if (escapedos(quotedcmdline16 + strlen(CMD_C), len * dosquotemultiplier,
cmdline16, len)) {
memset(&startinfo, 0, sizeof(startinfo));
startinfo.cb = sizeof(struct NtStartupInfo);
startinfo.dwFlags = kNtStartfUsestdhandles;
startinfo.hStdInput = STDIN_FILENO;
startinfo.hStdOutput = STDOUT_FILENO;
startinfo.hStdError = STDERR_FILENO;
if (CreateProcess(
/* lpApplicationName */ NULL,
/* lpCommandLine */ quotedcmdline16,
/* lpProcessAttributes */ NULL,
/* lpThreadAttributes */ NULL,
/* bInheritHandles */ true,
/* dwCreationFlags */ kNtCreateNoWindow,
/* lpEnvironment */ NULL,
/* lpCurrentDirectory */ NULL,
/* lpStartupInfo */ &startinfo,
/* lpProcessInformation */ info)) {
dwExitCode = kNtStillActive;
do {
WaitForSingleObject(info->hProcess, 0xffffffff);
} while ((status = GetExitCodeProcess(info->hProcess, &dwExitCode)) &&
dwExitCode == kNtStillActive);
if (weaken(fflush)) {
weaken(fflush)(*weaken(stderr));
}
rc = (dwExitCode & 0xff) << 8; /* @see WEXITSTATUS() */
CloseHandle(info->hProcess);
CloseHandle(info->hThread);
} else {
rc = winerr();
}
} else {
rc = einval();
}
free(mem);
return rc;
} else {
/* how could cmd.exe not exist? */
return true;
}
}
/**
* Launches program with system command interpreter.
*
* @param cmdline is an interpreted Turing-complete command
* @return -1 if child process couldn't be created, otherwise a wait
* status that can be accessed using macros like WEXITSTATUS(s)
*/
int system(const char *cmdline) {
int rc;
if (weaken(fflush)) weaken(fflush)(NULL);
if (!IsWindows()) {
rc = system$sysv(cmdline);
} else {
rc = system$nt(cmdline);
}
return rc;
}