[Xen-changelog] [xen stable-4.2] libxl: save/restore errno in SIGCHLD handler

[patchbot@xxxxxxx]

commit 616dfff3e37bbda0bcfa37991e19d522d7726744
Author:     Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
AuthorDate: Mon Nov 11 17:17:55 2013 +0000
Commit:     Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CommitDate: Mon Nov 25 13:49:23 2013 +0000

    libxl: save/restore errno in SIGCHLD handler
    
    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>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    (cherry picked from commit 704d10289bcaee46a3ef6cdc7966186e3b8033fa)
    (cherry picked from commit be68feb0e12a4538a33f5526ec1a09165aa18a45)
---
 tools/libxl/libxl_fork.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

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)
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.2

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