From 2815da0a3fbf2ae9b303e805c6829650f3f3d958 Mon Sep 17 00:00:00 2001
From: kurt <>
Date: Fri, 4 Apr 2008 19:30:41 +0000
Subject: [PATCH] - do not call pthread_atfork(3) handlers when a multithreaded
 program calls vfork(2). "untested, but looks OK" marc@ - document vfork(2),
 popen(3) and system(3) don't call atfork handlers in multithreaded programs.
 okay jmc@

---
 src/lib/libc/stdlib/system.3 | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/lib/libc/stdlib/system.3 b/src/lib/libc/stdlib/system.3
index 338d3bfa..a49e595b 100644
--- a/src/lib/libc/stdlib/system.3
+++ b/src/lib/libc/stdlib/system.3
@@ -29,9 +29,9 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"     $OpenBSD: system.3,v 1.10 2007/05/31 19:19:32 jmc Exp $
+.\"     $OpenBSD: system.3,v 1.11 2008/04/04 19:30:41 kurt Exp $
 .\"
-.Dd $Mdocdate: May 31 2007 $
+.Dd $Mdocdate: April 4 2008 $
 .Dt SYSTEM 3
 .Os
 .Sh NAME
@@ -66,6 +66,11 @@ Otherwise,
 .Fn system
 returns the termination status of the shell in the format specified by
 .Xr waitpid 2 .
+.Pp
+Note that fork handlers established using
+.Xr pthread_atfork 3
+are not called when a multithreaded program calls
+.Fn system .
 .Sh RETURN VALUES
 If a child process cannot be created, or the termination status of
 the shell cannot be obtained,