[Qemu-devel] [PATCH 3/4] qemu-nbd: report errors to syslog when daemonized

[Paolo Bonzini <pbonzini@redhat.com>]

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 qemu-nbd.c |   16 ++++++++++++++--
 1 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/qemu-nbd.c b/qemu-nbd.c
index 573bf3d..5031158 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -30,6 +30,7 @@
 #include <netinet/tcp.h>
 #include <arpa/inet.h>
 #include <signal.h>
+#include <syslog.h>
 #include <libgen.h>
 
 #define SOCKET_PATH    "/var/lock/qemu-nbd-%s"
@@ -37,6 +38,7 @@
 #define NBD_BUFFER_SIZE (1024*1024)
 
 static int verbose;
+static int daemonized;
 
 static void usage(const char *name)
 {
@@ -87,7 +89,11 @@ static void err(int status, const char *format, ...)
     if (vasprintf(&s, format, ap) == -1) {
 	abort();
     }
-    fprintf(stderr, "qemu-nbd: %s: %s\n", s, msg);
+    if (daemonized) {
+        syslog(LOG_ERR, "%s: %s", s, msg);
+    } else {
+        fprintf(stderr, "qemu-nbd: %s: %s\n", s, msg);
+    }
     free(s);
     exit(status);
 }
@@ -101,7 +107,11 @@ static void errx(int status, const char *format, ...)
     if (vasprintf(&s, format, ap) == -1) {
         abort();
     }
-    fprintf(stderr, "qemu-nbd: %s\n", s);
+    if (daemonized) {
+        syslog(LOG_ERR, "%s", s);
+    } else {
+        fprintf(stderr, "qemu-nbd: %s\n", s);
+    }
     free(s);
     exit(status);
 }
@@ -387,9 +397,11 @@ int main(int argc, char **argv)
 
         if (!verbose) {
             /* detach client and server */
+            openlog("qemu-nbd", LOG_PID, LOG_USER);
             if (qemu_daemon(0, 0) == -1) {
                 err(EXIT_FAILURE, "Failed to daemonize");
             }
+            daemonized = 1;
         }
 
         if (socket == NULL) {
-- 
1.7.6.4