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https://github.com/jart/cosmopolitan.git
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60 lines
3 KiB
C
60 lines
3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/weaken.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/hefty/spawn.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/paths.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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/**
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* Launches program with system command interpreter.
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*
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* @param cmdline is an interpreted Turing-complete command
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* @return -1 if child process couldn't be created, otherwise a wait
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* status that can be accessed using macros like WEXITSTATUS(s)
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*/
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int system(const char *cmdline) {
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char comspec[128];
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int rc, pid, wstatus;
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const char *prog, *arg;
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if (weaken(fflush)) weaken(fflush)(NULL);
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if (cmdline) {
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if ((pid = fork()) == -1) return -1;
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if (!pid) {
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strcpy(comspec, kNtSystemDirectory);
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strcat(comspec, "cmd.exe");
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prog = !IsWindows() ? _PATH_BSHELL : comspec;
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arg = !IsWindows() ? "-c" : "/C";
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execve(prog, (char *const[]){prog, arg, cmdline, NULL}, environ);
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_exit(errno);
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} else if (wait4(pid, &wstatus, 0, NULL) != -1) {
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return wstatus;
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} else {
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return -1;
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}
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} else if (IsWindows()) {
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return true;
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} else {
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return fileexists(_PATH_BSHELL);
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}
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}
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