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prevent fork's errno from being clobbered by atfork handlers

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If the syscall fails, errno must be set correctly for the caller.
There's no guarantee that the handlers registered with pthread_atfork
won't clobber errno, so we need to ensure it gets set after they are
called.
This commit is contained in:
Bobby Bingham 2017-11-10 18:15:43 -06:00 committed by Rich Felker
parent a39f20bf9f
commit c21051e90c
1 changed files with 3 additions and 3 deletions
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6
src/process/fork.c
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@ -18,9 +18,9 @@ pid_t fork(void)
__fork_handler(-1);
__block_all_sigs(&set);
#ifdef SYS_fork
ret = syscall(SYS_fork);
ret = __syscall(SYS_fork);
#else
ret = syscall(SYS_clone, SIGCHLD, 0);
ret = __syscall(SYS_clone, SIGCHLD, 0);
#endif
if (!ret) {
pthread_t self = __pthread_self();
@ -31,5 +31,5 @@ pid_t fork(void)
}
__restore_sigs(&set);
__fork_handler(!ret);
return ret;
return __syscall_ret(ret);
}