posix: Do not clobber errno by atfork handlers

Checked on x86_64-linux-gnu.

diff --git a/posix/fork.c b/posix/fork.c
index 44caf8d16633fc83ad7b90325cfbb535f7590e3a..940d6a095564df8e7bd1384a30f4e2c2724d61ef 100644 (file)
--- a/posix/fork.c
+++ b/posix/fork.c
@@ -103,6 +103,9 @@ __libc_fork (void)
     }
   else
     {
+      /* If _Fork failed, preserve its errno value.  */
+      int save_errno = errno;
+
       /* Release acquired locks in the multi-threaded case.  */
       if (multiple_threads)
        {
@@ -115,6 +118,9 @@ __libc_fork (void)
 
       /* Run the handlers registered for the parent.  */
       __run_fork_handlers (atfork_run_parent, multiple_threads);
+
+      if (pid < 0)
+       __set_errno (save_errno);
     }
 
   return pid;