[Xen-changelog] [xen master] tools/xenconsoled: Preserve errno while rotating logfile handles

[patchbot@xxxxxxx]

commit a7d4a5904b62731551e366ff62d84759c8ee68e2
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Tue May 16 14:57:27 2017 +0100
Commit:     Wei Liu <wei.liu2@xxxxxxxxxx>
CommitDate: Wed May 17 17:15:07 2017 +0100

    tools/xenconsoled: Preserve errno while rotating logfile handles
    
    The logic to optionally exit after a poll() error relies on errno, but
    handle_log_reload() does not preserve it.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
    Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
    Release-acked-by: Julien Grall <julien.grall@xxxxxxx>
---
 tools/console/daemon/io.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/console/daemon/io.c b/tools/console/daemon/io.c
index 7e6a886..7e474bb 100644
--- a/tools/console/daemon/io.c
+++ b/tools/console/daemon/io.c
@@ -1117,8 +1117,12 @@ void handle_io(void)
                ret = poll(fds, nr_fds, next_timeout ? poll_timeout : -1);
 
                if (log_reload) {
+                       int saved_errno = errno;
+
                        handle_log_reload();
                        log_reload = 0;
+
+                       errno = saved_errno;
                }
 
                /* Abort if poll failed, except for EINTR cases
--
generated by git-patchbot for /home/xen/git/xen.git#master

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