From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Thu, 21 Jan 2021 13:20:54 +0000 (-0300)
Subject: posix: Do not clobber errno by atfork handlers
X-Git-Tag: glibc-2.34~222
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d0c40833862f5cfe4d03d9130d79c1d93f284af0;p=thirdparty%2Fglibc.git

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 44caf8d1663..940d6a09556 100644
--- 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;