mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
3f0bcdc3ef
- Exhaustively document cancellation points - Rename SIGCANCEL to SIGTHR just like BSDs - Further improve POSIX thread cancellations - Ensure asynchronous cancellations work correctly - Elevate the quality of getrandom() and getentropy() - Make futexes cancel correctly on OpenBSD 6.x and 7.x - Add reboot.com and shutdown.com to examples directory - Remove underscore prefix from awesome timespec_*() APIs - Create assertions that help verify our cancellation points - Remove bad timespec APIs (cmp generalizes eq/ne/gt/gte/lt/lte)
80 lines
3.6 KiB
C
80 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/blockcancel.internal.h"
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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/intrin/weaken.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/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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#include "libc/thread/thread.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 Cosmopolitan Command Interpreter which provides
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* Bourne-like syntax on all platforms including Windows.
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*
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* @param cmdline is a unix shell script
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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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* WIFSIGNALED(s), WTERMSIG(s), etc.
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* @threadsafe
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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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BLOCK_CANCELLATIONS;
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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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_Exit(_cocmd(3, (char *[]){"system", "-c", cmdline, 0}, environ));
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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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ALLOW_CANCELLATIONS;
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return wstatus;
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}
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