This is a maintenance fork
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/errfuns.h"
static struct AtFork {
size_t i;
struct AtForkCallback {
void (*fn)(void *);
void *arg;
} p[ATEXIT_MAX];
} g_atfork;
/**
* Registers function to be called when PID changes.
*
* @return 0 on success, or -1 w/ errno
*/
int atfork(void *fn, void *arg) {
if (g_atfork.i == ARRAYLEN(g_atfork.p)) return enomem();
g_atfork.p[g_atfork.i++] = (struct AtForkCallback){.fn = fn, .arg = arg};
return 0;
}
/**
* Triggers atfork() callbacks.
*
* Only fork() should call this.
*/
void __onfork(void) {
size_t i;
for (i = 0; i < g_atfork.i; ++i) {
g_atfork.p[i].fn(g_atfork.p[i].arg);
}
}