Add support for systems without syslog.h

This patch disables the use of syslog for systems which
do not have it, such as QNX.  Log messages are still
printed to stderr.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=61176
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>

diff --git a/dbus/dbus-sysdeps-util-unix.c b/dbus/dbus-sysdeps-util-unix.c
index 6cff3fe..7beab20 100644 (file)
--- a/dbus/dbus-sysdeps-util-unix.c
+++ b/dbus/dbus-sysdeps-util-unix.c
@@ -49,7 +49,10 @@
 #include <sys/socket.h>
 #include <dirent.h>
 #include <sys/un.h>
+
+#ifdef HAVE_SYSLOG_H
 #include <syslog.h>
+#endif
 
 #ifdef HAVE_SYS_SYSLIMITS_H
 #include <sys/syslimits.h>
@@ -425,11 +428,15 @@ _dbus_request_file_descriptor_limit (unsigned int limit)
 void
 _dbus_init_system_log (void)
 {
+#ifdef HAVE_SYSLOG_H
+
 #if HAVE_DECL_LOG_PERROR
   openlog ("dbus", LOG_PID | LOG_PERROR, LOG_DAEMON);
 #else
   openlog ("dbus", LOG_PID, LOG_DAEMON);
 #endif
+
+#endif
 }
 
 /**
@@ -465,6 +472,7 @@ _dbus_system_log (DBusSystemLogSeverity severity, const char *msg, ...)
 void
 _dbus_system_logv (DBusSystemLogSeverity severity, const char *msg, va_list args)
 {
+#ifdef HAVE_SYSLOG_H
   int flags;
   switch (severity)
     {
@@ -481,7 +489,10 @@ _dbus_system_logv (DBusSystemLogSeverity severity, const char *msg, va_list args
         return;
     }
 
-#ifndef HAVE_DECL_LOG_PERROR
+  vsyslog (flags, msg, args);
+#endif
+
+#if !defined(HAVE_SYSLOG_H) || !HAVE_DECL_LOG_PERROR
     {
       /* vsyslog() won't write to stderr, so we'd better do it */
       va_list tmp;
@@ -494,8 +505,6 @@ _dbus_system_logv (DBusSystemLogSeverity severity, const char *msg, va_list args
     }
 #endif
 
-  vsyslog (flags, msg, args);
-
   if (severity == DBUS_SYSTEM_LOG_FATAL)
     exit (1);
 }