prevent fork's errno from being clobbered by atfork handlers

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.

diff --git a/src/process/fork.c b/src/process/fork.c
index b96f002..da074ae 100644 (file)
--- a/src/process/fork.c
+++ b/src/process/fork.c
@@ -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);
 }