54 lines
2.6 KiB
C
54 lines
2.6 KiB
C
/*-*- 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 │
|
|
│ │
|
|
│ This program is free software; you can redistribute it and/or modify │
|
|
│ it under the terms of the GNU General Public License as published by │
|
|
│ the Free Software Foundation; version 2 of the License. │
|
|
│ │
|
|
│ This program is distributed in the hope that it will be useful, but │
|
|
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
|
|
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
|
|
│ General Public License for more details. │
|
|
│ │
|
|
│ You should have received a copy of the GNU General Public License │
|
|
│ along with this program; if not, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#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);
|
|
}
|
|
}
|