[Xen-devel] [PATCH] libxl: save/restore errno in SIGCHLD handler

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Without this, code interrupted by SIGCHLD may experience strange
values of errno.  (As far as I know this is not the cause of any
reported bugs.)

This fix should be backported in due course.

Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
---
 tools/libxl/libxl_fork.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/libxl/libxl_fork.c b/tools/libxl/libxl_fork.c
index 044ddad..b6f0b2d 100644
--- a/tools/libxl/libxl_fork.c
+++ b/tools/libxl/libxl_fork.c
@@ -157,8 +157,10 @@ int libxl__carefd_fd(const libxl__carefd *cf)
 
 static void sigchld_handler(int signo)
 {
+    int esave = errno;
     int e = libxl__self_pipe_wakeup(sigchld_owner->sigchld_selfpipe[1]);
     assert(!e); /* errors are probably EBADF, very bad */
+    errno = esave;
 }
 
 static void sigchld_removehandler_core(void)
-- 
1.7.10.4


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