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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
90 lines
4 KiB
C
90 lines
4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 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/calls/struct/sigset.h"
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#include "libc/errno.h"
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#include "libc/limits.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/sysv/consts/sig.h"
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/**
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* Executes program and waits for it to complete, e.g.
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*
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* systemvpe("ls", (char *[]){"ls", dir, 0}, environ);
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*
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* This function is designed to do the same thing as system() except
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* rather than taking a shell script argument it accepts an array of
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* strings which are safely passed directly to execve().
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*
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* This function is 5x faster than system() and generally safer, for
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* most command running use cases that don't need to control the i/o
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* file descriptors.
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*
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* @param prog is path searched (if it doesn't contain a slash) from
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* the $PATH environment variable in `environ` (not your `envp`)
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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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* @see system()
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*/
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int systemvpe(const char *prog, char *const argv[], char *const envp[]) {
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char *exe;
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int pid, wstatus;
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char pathbuf[PATH_MAX + 1];
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sigset_t chldmask, savemask;
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if (!(exe = commandv(prog, pathbuf, sizeof(pathbuf)))) {
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return -1;
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}
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sigemptyset(&chldmask);
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sigaddset(&chldmask, SIGINT);
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sigaddset(&chldmask, SIGQUIT);
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sigaddset(&chldmask, SIGCHLD);
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sigprocmask(SIG_BLOCK, &chldmask, &savemask);
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if (!(pid = vfork())) {
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sigprocmask(SIG_SETMASK, &savemask, 0);
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execve(prog, argv, envp);
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_Exit(127);
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} else if (pid == -1) {
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wstatus = -1;
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} else {
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struct sigaction ignore, saveint, savequit;
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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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BLOCK_CANCELATION;
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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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ALLOW_CANCELATION;
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sigaction(SIGQUIT, &savequit, 0);
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sigaction(SIGINT, &saveint, 0);
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}
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sigprocmask(SIG_SETMASK, &savemask, 0);
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return wstatus;
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}
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