The pid file is now created only after the server is correctly initialied. It...

The pid file is now created only after the server is correctly initialied. It is also removed on sigterm and when the stack trace is produced after a sigbus or a sigsegv. This two changes should fix the Issue 175

src/redis.c

@@ -1085,11 +1085,7 @@ int prepareForShutdown() {
         if (server.vm_enabled) unlink(server.vm_swap_file);
     } else {
         /* Snapshotting. Perform a SYNC SAVE and exit */
-        if (rdbSave(server.dbfilename) == REDIS_OK) {
-            if (server.daemonize)
-                unlink(server.pidfile);
-            redisLog(REDIS_WARNING,"%zu bytes used at exit",zmalloc_used_memory());
-        } else {
+        if (rdbSave(server.dbfilename) != REDIS_OK) {
             /* Ooops.. error saving! The best we can do is to continue
              * operating. Note that if there was a background saving process,
              * in the next cron() Redis will be notified that the background
@@ -1099,6 +1095,7 @@ int prepareForShutdown() {
             return REDIS_ERR;
         }
     }
+    if (server.daemonize) unlink(server.pidfile);
     redisLog(REDIS_WARNING,"Server exit now, bye bye...");
     return REDIS_OK;
 }
@@ -1371,9 +1368,17 @@ void linuxOvercommitMemoryWarning(void) {
 }
 #endif /* __linux__ */
 
+void createPidFile(void) {
+    /* Try to write the pid file in a best-effort way. */
+    FILE *fp = fopen(server.pidfile,"w");
+    if (fp) {
+        fprintf(fp,"%d\n",getpid());
+        fclose(fp);
+    }
+}
+
 void daemonize(void) {
     int fd;
-    FILE *fp;
 
     if (fork() != 0) exit(0); /* parent exits */
     setsid(); /* create a new session */
@@ -1387,12 +1392,6 @@ void daemonize(void) {
         dup2(fd, STDERR_FILENO);
         if (fd > STDERR_FILENO) close(fd);
     }
-    /* Try to write the pid file */
-    fp = fopen(server.pidfile,"w");
-    if (fp) {
-        fprintf(fp,"%d\n",getpid());
-        fclose(fp);
-    }
 }
 
 void version() {
@@ -1425,6 +1424,7 @@ int main(int argc, char **argv) {
     }
     if (server.daemonize) daemonize();
     initServer();
+    if (server.daemonize) createPidFile();
     redisLog(REDIS_NOTICE,"Server started, Redis version " REDIS_VERSION);
 #ifdef __linux__
     linuxOvercommitMemoryWarning();
@@ -1501,6 +1501,7 @@ void segvHandler(int sig, siginfo_t *info, void *secret) {
         redisLog(REDIS_WARNING,"%s", messages[i]);
 
     /* free(messages); Don't call free() with possibly corrupted memory. */
+    if (server.daemonize) unlink(server.pidfile);
     _exit(0);
 }