X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/81f32c7b65c72a45fe1637ab0a661b144c54eb7c..0f51e3c5640c2f5be2766f10660f668bc71c7dd9:/src/redis.c

diff --git a/src/redis.c b/src/redis.c
index 39de86af..9c49bc22 100644
--- a/src/redis.c
+++ b/src/redis.c
@@ -291,6 +291,34 @@ void redisLog(int level, const char *fmt, ...) {
     redisLogRaw(level,msg);
 }
 
+/* Log a fixed message without printf-alike capabilities, in a way that is
+ * safe to call from a signal handler.
+ *
+ * We actually use this only for signals that are not fatal from the point
+ * of view of Redis. Signals that are going to kill the server anyway and
+ * where we need printf-alike features are served by redisLog(). */
+void redisLogFromHandler(int level, const char *msg) {
+    int fd;
+    char buf[64];
+
+    if ((level&0xff) < server.verbosity ||
+        (server.logfile == NULL && server.daemonize)) return;
+    fd = server.logfile ?
+        open(server.logfile, O_APPEND|O_CREAT|O_WRONLY, 0644) :
+        STDOUT_FILENO;
+    if (fd == -1) return;
+    ll2string(buf,sizeof(buf),getpid());
+    write(fd,"[",1);
+    write(fd,buf,strlen(buf));
+    write(fd," | signal handler] (",20);
+    ll2string(buf,sizeof(buf),time(NULL));
+    write(fd,buf,strlen(buf));
+    write(fd,") ",2);
+    write(fd,msg,strlen(msg));
+    write(fd,"\n",1);
+    if (server.logfile) close(fd);
+}
+
 /* Redis generally does not try to recover from out of memory conditions
  * when allocating objects or strings, it is not clear if it will be possible
  * to report this condition to the client since the networking layer itself
@@ -599,7 +627,7 @@ void activeExpireCycle(void) {
 }
 
 void updateLRUClock(void) {
-    server.lruclock = (time(NULL)/REDIS_LRU_CLOCK_RESOLUTION) &
+    server.lruclock = (server.unixtime/REDIS_LRU_CLOCK_RESOLUTION) &
                                                 REDIS_LRU_CLOCK_MAX;
 }
 
@@ -713,6 +741,10 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
     REDIS_NOTUSED(id);
     REDIS_NOTUSED(clientData);
 
+    /* Software watchdog: deliver the SIGALRM that will reach the signal
+     * handler if we don't return here fast enough. */
+    if (server.watchdog_period) watchdogScheduleSignal(server.watchdog_period);
+
     /* We take a cached value of the unix time in the global state because
      * with virtual memory and aging there is to store the current time
      * in objects at every object access, and accuracy is not needed.
@@ -808,15 +840,13 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
             updateDictResizePolicy();
         }
     } else {
-         time_t now = time(NULL);
-
         /* If there is not a background saving/rewrite in progress check if
          * we have to save/rewrite now */
          for (j = 0; j < server.saveparamslen; j++) {
             struct saveparam *sp = server.saveparams+j;
 
             if (server.dirty >= sp->changes &&
-                now-server.lastsave > sp->seconds) {
+                server.unixtime-server.lastsave > sp->seconds) {
                 redisLog(REDIS_NOTICE,"%d changes in %d seconds. Saving...",
                     sp->changes, sp->seconds);
                 rdbSaveBackground(server.rdb_filename);
@@ -1068,11 +1098,12 @@ void initServerConfig() {
     server.slowlog_log_slower_than = REDIS_SLOWLOG_LOG_SLOWER_THAN;
     server.slowlog_max_len = REDIS_SLOWLOG_MAX_LEN;
 
-    /* Assert */
+    /* Debugging */
     server.assert_failed = "<no assertion failed>";
     server.assert_file = "<no file>";
     server.assert_line = 0;
     server.bug_report_start = 0;
+    server.watchdog_period = 0;
 }
 
 /* This function will try to raise the max number of open files accordingly to
@@ -1641,7 +1672,7 @@ void bytesToHuman(char *s, unsigned long long n) {
  * on memory corruption problems. */
 sds genRedisInfoString(char *section) {
     sds info = sdsempty();
-    time_t uptime = time(NULL)-server.stat_starttime;
+    time_t uptime = server.unixtime-server.stat_starttime;
     int j, numcommands;
     struct rusage self_ru, c_ru;
     unsigned long lol, bib;
@@ -1780,7 +1811,7 @@ sds genRedisInfoString(char *section) {
             perc = ((double)server.loading_loaded_bytes /
                    server.loading_total_bytes) * 100;
 
-            elapsed = time(NULL)-server.loading_start_time;
+            elapsed = server.unixtime-server.loading_start_time;
             if (elapsed == 0) {
                 eta = 1; /* A fake 1 second figure if we don't have
                             enough info */
@@ -1851,7 +1882,7 @@ sds genRedisInfoString(char *section) {
                 (server.repl_state == REDIS_REPL_CONNECTED) ?
                     "up" : "down",
                 server.master ?
-                ((int)(time(NULL)-server.master->lastinteraction)) : -1,
+                ((int)(server.unixtime-server.master->lastinteraction)) : -1,
                 server.repl_state == REDIS_REPL_TRANSFER
             );
 
@@ -1860,14 +1891,14 @@ sds genRedisInfoString(char *section) {
                     "master_sync_left_bytes:%ld\r\n"
                     "master_sync_last_io_seconds_ago:%d\r\n"
                     ,(long)server.repl_transfer_left,
-                    (int)(time(NULL)-server.repl_transfer_lastio)
+                    (int)(server.unixtime-server.repl_transfer_lastio)
                 );
             }
 
             if (server.repl_state != REDIS_REPL_CONNECTED) {
                 info = sdscatprintf(info,
                     "master_link_down_since_seconds:%ld\r\n",
-                    (long)time(NULL)-server.repl_down_since);
+                    (long)server.unixtime-server.repl_down_since);
             }
         }
         info = sdscatprintf(info,
@@ -2228,7 +2259,7 @@ void redisAsciiArt(void) {
 static void sigtermHandler(int sig) {
     REDIS_NOTUSED(sig);
 
-    redisLog(REDIS_WARNING,"Received SIGTERM, scheduling shutdown...");
+    redisLogFromHandler(REDIS_WARNING,"Received SIGTERM, scheduling shutdown...");
     server.shutdown_asap = 1;
 }