sd-login: beef up login api, to add monitoring and enumerating

[elogind.git] / src / log.c

diff --git a/src/log.c b/src/log.c
index cc636a2dfac16e7fab8b1206717d3c1eb00e1a14..3776f0d9d89a920781166c90a15ba66937a93ce6 100644 (file)
--- a/src/log.c
+++ b/src/log.c
@@ -45,7 +45,7 @@ static bool syslog_is_stream = false;
 static bool show_color = false;
 static bool show_location = false;
 
-/* Akin to glibc's __abort_msg; which is private and we hance cannot
+/* Akin to glibc's __abort_msg; which is private and we hence cannot
  * use here. */
 static char *log_abort_msg = NULL;
 
@@ -74,7 +74,7 @@ static int log_open_console(void) {
                         return console_fd;
                 }
 
-                log_debug("Succesfully opened /dev/console for logging.");
+                log_debug("Successfully opened /dev/console for logging.");
         } else
                 console_fd = STDERR_FILENO;
 
@@ -100,7 +100,7 @@ static int log_open_kmsg(void) {
                 return -errno;
         }
 
-        log_debug("Succesfully opened /dev/kmsg for logging.");
+        log_debug("Successfully opened /dev/kmsg for logging.");
 
         return 0;
 }
@@ -171,7 +171,7 @@ static int log_open_syslog(void) {
         } else
                 syslog_is_stream = false;
 
-        log_debug("Succesfully opened syslog for logging.");
+        log_debug("Successfully opened syslog for logging.");
 
         return 0;
 
@@ -196,20 +196,26 @@ int log_open(void) {
                 return 0;
         }
 
-        if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
-            log_target == LOG_TARGET_SYSLOG)
-                if ((r = log_open_syslog()) >= 0) {
-                        log_close_console();
-                        return r;
-                }
-
-        if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
-            log_target == LOG_TARGET_KMSG)
-                if ((r = log_open_kmsg()) >= 0) {
-                        log_close_syslog();
-                        log_close_console();
-                        return r;
-                }
+        if (log_target != LOG_TARGET_AUTO ||
+            getpid() == 1 ||
+            isatty(STDERR_FILENO) <= 0) {
+
+                if (log_target == LOG_TARGET_AUTO ||
+                    log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
+                    log_target == LOG_TARGET_SYSLOG)
+                        if ((r = log_open_syslog()) >= 0) {
+                                log_close_console();
+                                return r;
+                        }
+                if (log_target == LOG_TARGET_AUTO ||
+                    log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
+                    log_target == LOG_TARGET_KMSG)
+                        if ((r = log_open_kmsg()) >= 0) {
+                                log_close_syslog();
+                                log_close_console();
+                                return r;
+                        }
+        }
 
         log_close_syslog();
 
@@ -232,11 +238,11 @@ void log_set_max_level(int level) {
 }
 
 static int write_to_console(
-        int level,
-        const char*file,
-        int line,
-        const char *func,
-        const char *buffer) {
+                int level,
+                const char*file,
+                int line,
+                const char *func,
+                const char *buffer) {
 
         char location[64];
         struct iovec iovec[5];
@@ -283,7 +289,7 @@ static int write_to_syslog(
         if (syslog_fd < 0)
                 return 0;
 
-        snprintf(header_priority, sizeof(header_priority), "<%i>", LOG_MAKEPRI(LOG_DAEMON, LOG_PRI(level)));
+        snprintf(header_priority, sizeof(header_priority), "<%i>", level);
         char_array_0(header_priority);
 
         t = (time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC);
@@ -340,7 +346,7 @@ static int write_to_kmsg(
         if (kmsg_fd < 0)
                 return 0;
 
-        snprintf(header_priority, sizeof(header_priority), "<%i>", LOG_PRI(level));
+        snprintf(header_priority, sizeof(header_priority), "<%i>", level);
         char_array_0(header_priority);
 
         snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) getpid());
@@ -371,6 +377,10 @@ static int log_dispatch(
         if (log_target == LOG_TARGET_NULL)
                 return 0;
 
+        /* Patch in LOG_DAEMON facility if necessary */
+        if ((level & LOG_FACMASK) == 0)
+                level = LOG_DAEMON | LOG_PRI(level);
+
         do {
                 char *e;
                 int k = 0;
@@ -383,7 +393,8 @@ static int log_dispatch(
                 if ((e = strpbrk(buffer, NEWLINE)))
                         *(e++) = 0;
 
-                if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
+                if (log_target == LOG_TARGET_AUTO ||
+                    log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
                     log_target == LOG_TARGET_SYSLOG) {
 
                         if ((k = write_to_syslog(level, file, line, func, buffer)) < 0) {
@@ -394,7 +405,8 @@ static int log_dispatch(
                 }
 
                 if (k <= 0 &&
-                    (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
+                    (log_target == LOG_TARGET_AUTO ||
+                     log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
                      log_target == LOG_TARGET_KMSG)) {
 
                         if ((k = write_to_kmsg(level, file, line, func, buffer)) < 0) {
@@ -568,7 +580,8 @@ static const char *const log_target_table[] = {
         [LOG_TARGET_SYSLOG] = "syslog",
         [LOG_TARGET_KMSG] = "kmsg",
         [LOG_TARGET_SYSLOG_OR_KMSG] = "syslog-or-kmsg",
-        [LOG_TARGET_NULL] = "null"
+        [LOG_TARGET_NULL] = "null",
+        [LOG_TARGET_AUTO] = "auto"
 };
 
 DEFINE_STRING_TABLE_LOOKUP(log_target, LogTarget);