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add pthread_atfork interface

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note that this presently does not handle consistency of the libc's own
global state during forking. as per POSIX 2008, if the parent process
was threaded, the child process may only call async-signal-safe
functions until one of the exec-family functions is called, so the
current behavior is believed to be conformant even if non-ideal. it
may be improved at some later time.
This commit is contained in:
Rich Felker
2011-02-18 19:52:42 -05:00
parent 446b4207cc
commit e9417fffb3
4 changed files with 57 additions and 3 deletions
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9
src/process/fork.c
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@ -1,9 +1,12 @@
#include <unistd.h>
#include "syscall.h"
/* FIXME: add support for atfork stupidity */
#include "libc.h"
pid_t fork(void)
{
return syscall0(__NR_fork);
pid_t ret;
if (libc.fork_handler) libc.fork_handler(-1);
ret = syscall0(__NR_fork);
if (libc.fork_handler) libc.fork_handler(!ret);
return ret;
}