53 lines
2.5 KiB
C
53 lines
2.5 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/macros.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/errfuns.h"
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static struct AtFork {
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size_t i;
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struct AtForkCallback {
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void (*fn)(void *);
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void *arg;
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} p[ATEXIT_MAX];
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} g_atfork;
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/**
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* Registers function to be called when PID changes.
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*
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* @return 0 on success, or -1 w/ errno
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*/
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int atfork(void *fn, void *arg) {
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if (g_atfork.i == ARRAYLEN(g_atfork.p)) return enomem();
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g_atfork.p[g_atfork.i++] = (struct AtForkCallback){.fn = fn, .arg = arg};
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return 0;
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}
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/**
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* Triggers atfork() callbacks.
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*
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* Only fork() should call this.
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*/
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void __onfork(void) {
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size_t i;
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for (i = 0; i < g_atfork.i; ++i) {
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g_atfork.p[i].fn(g_atfork.p[i].arg);
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}
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}
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