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https://github.com/jart/cosmopolitan.git
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950a1b310b
This change lets you use system() in an easier and portable way. The problem with the call in the past has always been that bourne and cmd.com on Windows have less than nothing in common, so pretty much the only command system() could be used for across platforms was maybe echo. cmd.exe is also a security liability due to its escaping rules. Since cocmd.com implements 85% of what we need from bourne, in a really tiny way, it makes perfect sense to be embedded in these functionss. We get a huge performance boost too. Fixes #644
82 lines
3.6 KiB
C
82 lines
3.6 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/calls/calls.h"
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#include "libc/calls/struct/rusage.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/log/log.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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#include "libc/sysv/consts/ok.h"
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#include "libc/sysv/consts/sig.h"
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/**
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* Launches program with system command interpreter.
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*
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* This embeds the cocmd.com shell interpreter which supports a limited
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* subset of the bourne shell that's significantly faster:
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*
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* - pipelines
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* - single quotes
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* - double quotes
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* - input redirection, e.g. `<path`
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* - output redirection, e.g. `>path`, `>>append`, `2>err.txt, `2>&1`
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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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int pid, wstatus;
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sigset_t chldmask, savemask;
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struct sigaction ignore, saveint, savequit;
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if (!cmdline) return 1;
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ignore.sa_flags = 0;
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ignore.sa_handler = SIG_IGN;
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sigemptyset(&ignore.sa_mask);
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sigaction(SIGINT, &ignore, &saveint);
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sigaction(SIGQUIT, &ignore, &savequit);
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sigemptyset(&chldmask);
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sigaddset(&chldmask, SIGCHLD);
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sigprocmask(SIG_BLOCK, &chldmask, &savemask);
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if (!(pid = fork())) {
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sigaction(SIGINT, &saveint, 0);
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sigaction(SIGQUIT, &savequit, 0);
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sigprocmask(SIG_SETMASK, &savemask, 0);
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systemexec(cmdline);
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_exit(127);
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} else if (pid != -1) {
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while (wait4(pid, &wstatus, 0, 0) == -1) {
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if (errno != EINTR) {
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wstatus = -1;
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break;
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}
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}
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} else {
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wstatus = -1;
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}
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sigaction(SIGINT, &saveint, 0);
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sigaction(SIGQUIT, &savequit, 0);
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sigprocmask(SIG_SETMASK, &savemask, 0);
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return wstatus;
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}
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