mirror of
https://github.com/jart/cosmopolitan.git
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62 lines
2.9 KiB
C
62 lines
2.9 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 2021 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/errno.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/x/x.h"
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/**
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* Spawns process using vfork().
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*
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* @param f is child callback
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* @param r if provided gets accounting data
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* @return wstatus, or -1 w/ errno
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*/
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int xvspawn(void f(void *), void *ctx, struct rusage *r) {
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int pid, wstatus;
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sigset_t chldmask, savemask;
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struct sigaction saveint, savequit;
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xsigaction(SIGINT, SIG_IGN, 0, 0, &saveint);
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xsigaction(SIGQUIT, SIG_IGN, 0, 0, &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 = vfork()) != -1) {
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if (!pid) {
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xsigaction(SIGINT, SIG_DFL, 0, 0, 0);
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xsigaction(SIGQUIT, SIG_DFL, 0, 0, 0);
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sigprocmask(SIG_SETMASK, &savemask, 0);
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f(ctx);
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_exit(127);
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}
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while (wait4(pid, &wstatus, 0, r) == -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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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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} else {
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return -1;
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}
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}
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