#include "sha1.h" /* SHA1 is used for DEBUG DIGEST */
#include <arpa/inet.h>
+#include <signal.h>
+
+#ifdef HAVE_BACKTRACE
+#include <execinfo.h>
+#include <ucontext.h>
+#include <fcntl.h>
+#endif /* HAVE_BACKTRACE */
/* ================================= Debugging ============================== */
while((de = dictNext(di)) != NULL) {
sds key;
robj *keyobj, *o;
- time_t expiretime;
+ long long expiretime;
memset(digest,0,20); /* This key-val digest */
- key = dictGetEntryKey(de);
+ key = dictGetKey(de);
keyobj = createStringObject(key,sdslen(key));
mixDigest(digest,key,sdslen(key));
- /* Make sure the key is loaded if VM is active */
- o = lookupKeyRead(db,keyobj);
+ o = dictGetVal(de);
aux = htonl(o->type);
mixDigest(digest,&aux,sizeof(aux));
}
setTypeReleaseIterator(si);
} else if (o->type == REDIS_ZSET) {
- zset *zs = o->ptr;
- dictIterator *di = dictGetIterator(zs->dict);
- dictEntry *de;
+ unsigned char eledigest[20];
- while((de = dictNext(di)) != NULL) {
- robj *eleobj = dictGetEntryKey(de);
- double *score = dictGetEntryVal(de);
- unsigned char eledigest[20];
+ if (o->encoding == REDIS_ENCODING_ZIPLIST) {
+ unsigned char *zl = o->ptr;
+ unsigned char *eptr, *sptr;
+ unsigned char *vstr;
+ unsigned int vlen;
+ long long vll;
+ double score;
- snprintf(buf,sizeof(buf),"%.17g",*score);
- memset(eledigest,0,20);
- mixObjectDigest(eledigest,eleobj);
- mixDigest(eledigest,buf,strlen(buf));
- xorDigest(digest,eledigest,20);
+ eptr = ziplistIndex(zl,0);
+ redisAssert(eptr != NULL);
+ sptr = ziplistNext(zl,eptr);
+ redisAssert(sptr != NULL);
+
+ while (eptr != NULL) {
+ redisAssert(ziplistGet(eptr,&vstr,&vlen,&vll));
+ score = zzlGetScore(sptr);
+
+ memset(eledigest,0,20);
+ if (vstr != NULL) {
+ mixDigest(eledigest,vstr,vlen);
+ } else {
+ ll2string(buf,sizeof(buf),vll);
+ mixDigest(eledigest,buf,strlen(buf));
+ }
+
+ snprintf(buf,sizeof(buf),"%.17g",score);
+ mixDigest(eledigest,buf,strlen(buf));
+ xorDigest(digest,eledigest,20);
+ zzlNext(zl,&eptr,&sptr);
+ }
+ } else if (o->encoding == REDIS_ENCODING_SKIPLIST) {
+ zset *zs = o->ptr;
+ dictIterator *di = dictGetIterator(zs->dict);
+ dictEntry *de;
+
+ while((de = dictNext(di)) != NULL) {
+ robj *eleobj = dictGetKey(de);
+ double *score = dictGetVal(de);
+
+ snprintf(buf,sizeof(buf),"%.17g",*score);
+ memset(eledigest,0,20);
+ mixObjectDigest(eledigest,eleobj);
+ mixDigest(eledigest,buf,strlen(buf));
+ xorDigest(digest,eledigest,20);
+ }
+ dictReleaseIterator(di);
+ } else {
+ redisPanic("Unknown sorted set encoding");
}
- dictReleaseIterator(di);
} else if (o->type == REDIS_HASH) {
hashTypeIterator *hi;
robj *obj;
void debugCommand(redisClient *c) {
if (!strcasecmp(c->argv[1]->ptr,"segfault")) {
*((char*)-1) = 'x';
+ } else if (!strcasecmp(c->argv[1]->ptr,"oom")) {
+ void *ptr = zmalloc(ULONG_MAX); /* Should trigger an out of memory. */
+ zfree(ptr);
+ addReply(c,shared.ok);
+ } else if (!strcasecmp(c->argv[1]->ptr,"assert")) {
+ if (c->argc >= 3) c->argv[2] = tryObjectEncoding(c->argv[2]);
+ redisAssertWithInfo(c,c->argv[0],1 == 2);
} else if (!strcasecmp(c->argv[1]->ptr,"reload")) {
- if (rdbSave(server.dbfilename) != REDIS_OK) {
+ if (rdbSave(server.rdb_filename) != REDIS_OK) {
addReply(c,shared.err);
return;
}
emptyDb();
- if (rdbLoad(server.dbfilename) != REDIS_OK) {
- addReply(c,shared.err);
+ if (rdbLoad(server.rdb_filename) != REDIS_OK) {
+ addReplyError(c,"Error trying to load the RDB dump");
return;
}
redisLog(REDIS_WARNING,"DB reloaded by DEBUG RELOAD");
addReply(c,shared.ok);
} else if (!strcasecmp(c->argv[1]->ptr,"loadaof")) {
emptyDb();
- if (loadAppendOnlyFile(server.appendfilename) != REDIS_OK) {
+ if (loadAppendOnlyFile(server.aof_filename) != REDIS_OK) {
addReply(c,shared.err);
return;
}
+ server.dirty = 0; /* Prevent AOF / replication */
redisLog(REDIS_WARNING,"Append Only File loaded by DEBUG LOADAOF");
addReply(c,shared.ok);
} else if (!strcasecmp(c->argv[1]->ptr,"object") && c->argc == 3) {
- dictEntry *de = dictFind(c->db->dict,c->argv[2]->ptr);
+ dictEntry *de;
robj *val;
char *strenc;
- if (!de) {
+ if ((de = dictFind(c->db->dict,c->argv[2]->ptr)) == NULL) {
addReply(c,shared.nokeyerr);
return;
}
- val = dictGetEntryVal(de);
+ val = dictGetVal(de);
strenc = strEncoding(val->encoding);
addReplyStatusFormat(c,
d = sdscatprintf(d, "%02x",digest[j]);
addReplyStatus(c,d);
sdsfree(d);
+ } else if (!strcasecmp(c->argv[1]->ptr,"sleep") && c->argc == 3) {
+ double dtime = strtod(c->argv[2]->ptr,NULL);
+ long long utime = dtime*1000000;
+
+ usleep(utime);
+ addReply(c,shared.ok);
} else {
addReplyError(c,
"Syntax error, try DEBUG [SEGFAULT|OBJECT <key>|SWAPIN <key>|SWAPOUT <key>|RELOAD]");
}
}
+/* =========================== Crash handling ============================== */
+
void _redisAssert(char *estr, char *file, int line) {
+ bugReportStart();
redisLog(REDIS_WARNING,"=== ASSERTION FAILED ===");
redisLog(REDIS_WARNING,"==> %s:%d '%s' is not true",file,line,estr);
#ifdef HAVE_BACKTRACE
- redisLog(REDIS_WARNING,"(forcing SIGSEGV in order to print the stack trace)");
- *((char*)-1) = 'x';
+ server.assert_failed = estr;
+ server.assert_file = file;
+ server.assert_line = line;
+ redisLog(REDIS_WARNING,"(forcing SIGSEGV to print the bug report.)");
#endif
+ *((char*)-1) = 'x';
+}
+
+void _redisAssertPrintClientInfo(redisClient *c) {
+ int j;
+
+ bugReportStart();
+ redisLog(REDIS_WARNING,"=== ASSERTION FAILED CLIENT CONTEXT ===");
+ redisLog(REDIS_WARNING,"client->flags = %d", c->flags);
+ redisLog(REDIS_WARNING,"client->fd = %d", c->fd);
+ redisLog(REDIS_WARNING,"client->argc = %d", c->argc);
+ for (j=0; j < c->argc; j++) {
+ char buf[128];
+ char *arg;
+
+ if (c->argv[j]->type == REDIS_STRING &&
+ c->argv[j]->encoding == REDIS_ENCODING_RAW)
+ {
+ arg = (char*) c->argv[j]->ptr;
+ } else {
+ snprintf(buf,sizeof(buf),"Object type: %d, encoding: %d",
+ c->argv[j]->type, c->argv[j]->encoding);
+ arg = buf;
+ }
+ redisLog(REDIS_WARNING,"client->argv[%d] = \"%s\" (refcount: %d)",
+ j, arg, c->argv[j]->refcount);
+ }
+}
+
+void redisLogObjectDebugInfo(robj *o) {
+ redisLog(REDIS_WARNING,"Object type: %d", o->type);
+ redisLog(REDIS_WARNING,"Object encoding: %d", o->encoding);
+ redisLog(REDIS_WARNING,"Object refcount: %d", o->refcount);
+ if (o->type == REDIS_STRING && o->encoding == REDIS_ENCODING_RAW) {
+ redisLog(REDIS_WARNING,"Object raw string len: %d", sdslen(o->ptr));
+ if (sdslen(o->ptr) < 4096)
+ redisLog(REDIS_WARNING,"Object raw string content: \"%s\"", (char*)o->ptr);
+ } else if (o->type == REDIS_LIST) {
+ redisLog(REDIS_WARNING,"List length: %d", (int) listTypeLength(o));
+ } else if (o->type == REDIS_SET) {
+ redisLog(REDIS_WARNING,"Set size: %d", (int) setTypeSize(o));
+ } else if (o->type == REDIS_HASH) {
+ redisLog(REDIS_WARNING,"Hash size: %d", (int) hashTypeLength(o));
+ } else if (o->type == REDIS_ZSET) {
+ redisLog(REDIS_WARNING,"Sorted set size: %d", (int) zsetLength(o));
+ if (o->encoding == REDIS_ENCODING_SKIPLIST)
+ redisLog(REDIS_WARNING,"Skiplist level: %d", (int) ((zset*)o->ptr)->zsl->level);
+ }
+}
+
+void _redisAssertPrintObject(robj *o) {
+ bugReportStart();
+ redisLog(REDIS_WARNING,"=== ASSERTION FAILED OBJECT CONTEXT ===");
+ redisLogObjectDebugInfo(o);
+}
+
+void _redisAssertWithInfo(redisClient *c, robj *o, char *estr, char *file, int line) {
+ if (c) _redisAssertPrintClientInfo(c);
+ if (o) _redisAssertPrintObject(o);
+ _redisAssert(estr,file,line);
}
void _redisPanic(char *msg, char *file, int line) {
+ bugReportStart();
redisLog(REDIS_WARNING,"------------------------------------------------");
redisLog(REDIS_WARNING,"!!! Software Failure. Press left mouse button to continue");
redisLog(REDIS_WARNING,"Guru Meditation: %s #%s:%d",msg,file,line);
#ifdef HAVE_BACKTRACE
redisLog(REDIS_WARNING,"(forcing SIGSEGV in order to print the stack trace)");
+#endif
redisLog(REDIS_WARNING,"------------------------------------------------");
*((char*)-1) = 'x';
+}
+
+void bugReportStart(void) {
+ if (server.bug_report_start == 0) {
+ redisLog(REDIS_WARNING,
+ "\n\n=== REDIS BUG REPORT START: Cut & paste starting from here ===");
+ server.bug_report_start = 1;
+ }
+}
+
+#ifdef HAVE_BACKTRACE
+static void *getMcontextEip(ucontext_t *uc) {
+#if defined(__APPLE__) && !defined(MAC_OS_X_VERSION_10_6)
+ /* OSX < 10.6 */
+ #if defined(__x86_64__)
+ return (void*) uc->uc_mcontext->__ss.__rip;
+ #elif defined(__i386__)
+ return (void*) uc->uc_mcontext->__ss.__eip;
+ #else
+ return (void*) uc->uc_mcontext->__ss.__srr0;
+ #endif
+#elif defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6)
+ /* OSX >= 10.6 */
+ #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
+ return (void*) uc->uc_mcontext->__ss.__rip;
+ #else
+ return (void*) uc->uc_mcontext->__ss.__eip;
+ #endif
+#elif defined(__linux__)
+ /* Linux */
+ #if defined(__i386__)
+ return (void*) uc->uc_mcontext.gregs[14]; /* Linux 32 */
+ #elif defined(__X86_64__) || defined(__x86_64__)
+ return (void*) uc->uc_mcontext.gregs[16]; /* Linux 64 */
+ #elif defined(__ia64__) /* Linux IA64 */
+ return (void*) uc->uc_mcontext.sc_ip;
+ #endif
+#else
+ return NULL;
+#endif
+}
+
+void logStackContent(void **sp) {
+ int i;
+ for (i = 15; i >= 0; i--) {
+ if (sizeof(long) == 4)
+ redisLog(REDIS_WARNING, "(%08lx) -> %08lx", sp+i, sp[i]);
+ else
+ redisLog(REDIS_WARNING, "(%016lx) -> %016lx", sp+i, sp[i]);
+ }
+}
+
+void logRegisters(ucontext_t *uc) {
+ redisLog(REDIS_WARNING, "--- REGISTERS");
+
+/* OSX */
+#if defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6)
+ /* OSX AMD64 */
+ #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
+ redisLog(REDIS_WARNING,
+ "\n"
+ "RAX:%016lx RBX:%016lx\nRCX:%016lx RDX:%016lx\n"
+ "RDI:%016lx RSI:%016lx\nRBP:%016lx RSP:%016lx\n"
+ "R8 :%016lx R9 :%016lx\nR10:%016lx R11:%016lx\n"
+ "R12:%016lx R13:%016lx\nR14:%016lx R15:%016lx\n"
+ "RIP:%016lx EFL:%016lx\nCS :%016lx FS:%016lx GS:%016lx",
+ uc->uc_mcontext->__ss.__rax,
+ uc->uc_mcontext->__ss.__rbx,
+ uc->uc_mcontext->__ss.__rcx,
+ uc->uc_mcontext->__ss.__rdx,
+ uc->uc_mcontext->__ss.__rdi,
+ uc->uc_mcontext->__ss.__rsi,
+ uc->uc_mcontext->__ss.__rbp,
+ uc->uc_mcontext->__ss.__rsp,
+ uc->uc_mcontext->__ss.__r8,
+ uc->uc_mcontext->__ss.__r9,
+ uc->uc_mcontext->__ss.__r10,
+ uc->uc_mcontext->__ss.__r11,
+ uc->uc_mcontext->__ss.__r12,
+ uc->uc_mcontext->__ss.__r13,
+ uc->uc_mcontext->__ss.__r14,
+ uc->uc_mcontext->__ss.__r15,
+ uc->uc_mcontext->__ss.__rip,
+ uc->uc_mcontext->__ss.__rflags,
+ uc->uc_mcontext->__ss.__cs,
+ uc->uc_mcontext->__ss.__fs,
+ uc->uc_mcontext->__ss.__gs
+ );
+ logStackContent((void**)uc->uc_mcontext->__ss.__rsp);
+ #else
+ /* OSX x86 */
+ redisLog(REDIS_WARNING,
+ "\n"
+ "EAX:%08lx EBX:%08lx ECX:%08lx EDX:%08lx\n"
+ "EDI:%08lx ESI:%08lx EBP:%08lx ESP:%08lx\n"
+ "SS:%08lx EFL:%08lx EIP:%08lx CS :%08lx\n"
+ "DS:%08lx ES:%08lx FS :%08lx GS :%08lx",
+ uc->uc_mcontext->__ss.__eax,
+ uc->uc_mcontext->__ss.__ebx,
+ uc->uc_mcontext->__ss.__ecx,
+ uc->uc_mcontext->__ss.__edx,
+ uc->uc_mcontext->__ss.__edi,
+ uc->uc_mcontext->__ss.__esi,
+ uc->uc_mcontext->__ss.__ebp,
+ uc->uc_mcontext->__ss.__esp,
+ uc->uc_mcontext->__ss.__ss,
+ uc->uc_mcontext->__ss.__eflags,
+ uc->uc_mcontext->__ss.__eip,
+ uc->uc_mcontext->__ss.__cs,
+ uc->uc_mcontext->__ss.__ds,
+ uc->uc_mcontext->__ss.__es,
+ uc->uc_mcontext->__ss.__fs,
+ uc->uc_mcontext->__ss.__gs
+ );
+ logStackContent((void**)uc->uc_mcontext->__ss.__esp);
+ #endif
+/* Linux */
+#elif defined(__linux__)
+ /* Linux x86 */
+ #if defined(__i386__)
+ redisLog(REDIS_WARNING,
+ "\n"
+ "EAX:%08lx EBX:%08lx ECX:%08lx EDX:%08lx\n"
+ "EDI:%08lx ESI:%08lx EBP:%08lx ESP:%08lx\n"
+ "SS :%08lx EFL:%08lx EIP:%08lx CS:%08lx\n"
+ "DS :%08lx ES :%08lx FS :%08lx GS:%08lx",
+ uc->uc_mcontext.gregs[11],
+ uc->uc_mcontext.gregs[8],
+ uc->uc_mcontext.gregs[10],
+ uc->uc_mcontext.gregs[9],
+ uc->uc_mcontext.gregs[4],
+ uc->uc_mcontext.gregs[5],
+ uc->uc_mcontext.gregs[6],
+ uc->uc_mcontext.gregs[7],
+ uc->uc_mcontext.gregs[18],
+ uc->uc_mcontext.gregs[17],
+ uc->uc_mcontext.gregs[14],
+ uc->uc_mcontext.gregs[15],
+ uc->uc_mcontext.gregs[3],
+ uc->uc_mcontext.gregs[2],
+ uc->uc_mcontext.gregs[1],
+ uc->uc_mcontext.gregs[0]
+ );
+ logStackContent((void**)uc->uc_mcontext.gregs[7]);
+ #elif defined(__X86_64__) || defined(__x86_64__)
+ /* Linux AMD64 */
+ redisLog(REDIS_WARNING,
+ "\n"
+ "RAX:%016lx RBX:%016lx\nRCX:%016lx RDX:%016lx\n"
+ "RDI:%016lx RSI:%016lx\nRBP:%016lx RSP:%016lx\n"
+ "R8 :%016lx R9 :%016lx\nR10:%016lx R11:%016lx\n"
+ "R12:%016lx R13:%016lx\nR14:%016lx R15:%016lx\n"
+ "RIP:%016lx EFL:%016lx\nCSGSFS:%016lx",
+ uc->uc_mcontext.gregs[13],
+ uc->uc_mcontext.gregs[11],
+ uc->uc_mcontext.gregs[14],
+ uc->uc_mcontext.gregs[12],
+ uc->uc_mcontext.gregs[8],
+ uc->uc_mcontext.gregs[9],
+ uc->uc_mcontext.gregs[10],
+ uc->uc_mcontext.gregs[15],
+ uc->uc_mcontext.gregs[0],
+ uc->uc_mcontext.gregs[1],
+ uc->uc_mcontext.gregs[2],
+ uc->uc_mcontext.gregs[3],
+ uc->uc_mcontext.gregs[4],
+ uc->uc_mcontext.gregs[5],
+ uc->uc_mcontext.gregs[6],
+ uc->uc_mcontext.gregs[7],
+ uc->uc_mcontext.gregs[16],
+ uc->uc_mcontext.gregs[17],
+ uc->uc_mcontext.gregs[18]
+ );
+ logStackContent((void**)uc->uc_mcontext.gregs[15]);
+ #endif
+#else
+ redisLog(REDIS_WARNING,
+ " Dumping of registers not supported for this OS/arch");
+#endif
+}
+
+/* Logs the stack trace using the backtrace() call. This function is designed
+ * to be called from signal handlers safely. */
+void logStackTrace(ucontext_t *uc) {
+ void *trace[100];
+ int trace_size = 0, fd;
+
+ /* Open the log file in append mode. */
+ fd = server.logfile ?
+ open(server.logfile, O_APPEND|O_CREAT|O_WRONLY, 0644) :
+ STDOUT_FILENO;
+ if (fd == -1) return;
+
+ /* Generate the stack trace */
+ trace_size = backtrace(trace, 100);
+
+ /* overwrite sigaction with caller's address */
+ if (getMcontextEip(uc) != NULL)
+ trace[1] = getMcontextEip(uc);
+
+ /* Write symbols to log file */
+ backtrace_symbols_fd(trace, trace_size, fd);
+
+ /* Cleanup */
+ if (server.logfile) close(fd);
+}
+
+/* Log information about the "current" client, that is, the client that is
+ * currently being served by Redis. May be NULL if Redis is not serving a
+ * client right now. */
+void logCurrentClient(void) {
+ if (server.current_client == NULL) return;
+
+ redisClient *cc = server.current_client;
+ sds client;
+ int j;
+
+ redisLog(REDIS_WARNING, "--- CURRENT CLIENT INFO");
+ client = getClientInfoString(cc);
+ redisLog(REDIS_WARNING,"client: %s", client);
+ sdsfree(client);
+ for (j = 0; j < cc->argc; j++) {
+ robj *decoded;
+
+ decoded = getDecodedObject(cc->argv[j]);
+ redisLog(REDIS_WARNING,"argv[%d]: '%s'", j, (char*)decoded->ptr);
+ decrRefCount(decoded);
+ }
+ /* Check if the first argument, usually a key, is found inside the
+ * selected DB, and if so print info about the associated object. */
+ if (cc->argc >= 1) {
+ robj *val, *key;
+ dictEntry *de;
+
+ key = getDecodedObject(cc->argv[1]);
+ de = dictFind(cc->db->dict, key->ptr);
+ if (de) {
+ val = dictGetVal(de);
+ redisLog(REDIS_WARNING,"key '%s' found in DB containing the following object:", key->ptr);
+ redisLogObjectDebugInfo(val);
+ }
+ decrRefCount(key);
+ }
+}
+
+void sigsegvHandler(int sig, siginfo_t *info, void *secret) {
+ ucontext_t *uc = (ucontext_t*) secret;
+ sds infostring, clients;
+ struct sigaction act;
+ REDIS_NOTUSED(info);
+
+ bugReportStart();
+ redisLog(REDIS_WARNING,
+ " Redis %s crashed by signal: %d", REDIS_VERSION, sig);
+ redisLog(REDIS_WARNING,
+ " Failed assertion: %s (%s:%d)", server.assert_failed,
+ server.assert_file, server.assert_line);
+
+ /* Log the stack trace */
+ redisLog(REDIS_WARNING, "--- STACK TRACE");
+ logStackTrace(uc);
+
+ /* Log INFO and CLIENT LIST */
+ redisLog(REDIS_WARNING, "--- INFO OUTPUT");
+ infostring = genRedisInfoString("all");
+ infostring = sdscatprintf(infostring, "hash_init_value: %u\n",
+ dictGetHashFunctionSeed());
+ redisLogRaw(REDIS_WARNING, infostring);
+ redisLog(REDIS_WARNING, "--- CLIENT LIST OUTPUT");
+ clients = getAllClientsInfoString();
+ redisLogRaw(REDIS_WARNING, clients);
+ sdsfree(infostring);
+ sdsfree(clients);
+
+ /* Log the current client */
+ logCurrentClient();
+
+ /* Log dump of processor registers */
+ logRegisters(uc);
+
+ redisLog(REDIS_WARNING,
+"\n=== REDIS BUG REPORT END. Make sure to include from START to END. ===\n\n"
+" Please report the crash opening an issue on github:\n\n"
+" http://github.com/antirez/redis/issues\n\n"
+" Suspect RAM error? Use redis-server --test-memory to veryfy it.\n\n"
+);
+ /* free(messages); Don't call free() with possibly corrupted memory. */
+ if (server.daemonize) unlink(server.pidfile);
+
+ /* Make sure we exit with the right signal at the end. So for instance
+ * the core will be dumped if enabled. */
+ sigemptyset (&act.sa_mask);
+ act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND;
+ act.sa_handler = SIG_DFL;
+ sigaction (sig, &act, NULL);
+ kill(getpid(),sig);
+}
+#endif /* HAVE_BACKTRACE */
+
+/* ==================== Logging functions for debugging ===================== */
+
+void redisLogHexDump(int level, char *descr, void *value, size_t len) {
+ char buf[65], *b;
+ unsigned char *v = value;
+ char charset[] = "0123456789abcdef";
+
+ redisLog(level,"%s (hexdump):", descr);
+ b = buf;
+ while(len) {
+ b[0] = charset[(*v)>>4];
+ b[1] = charset[(*v)&0xf];
+ b[2] = '\0';
+ b += 2;
+ len--;
+ v++;
+ if (b-buf == 64 || len == 0) {
+ redisLogRaw(level|REDIS_LOG_RAW,buf);
+ b = buf;
+ }
+ }
+ redisLogRaw(level|REDIS_LOG_RAW,"\n");
+}
+
+/* =========================== Software Watchdog ============================ */
+#include <sys/time.h>
+
+void watchdogSignalHandler(int sig, siginfo_t *info, void *secret) {
+#ifdef HAVE_BACKTRACE
+ ucontext_t *uc = (ucontext_t*) secret;
+#endif
+ REDIS_NOTUSED(info);
+ REDIS_NOTUSED(sig);
+
+ redisLogFromHandler(REDIS_WARNING,"\n--- WATCHDOG TIMER EXPIRED ---");
+#ifdef HAVE_BACKTRACE
+ logStackTrace(uc);
+#else
+ redisLogFromHandler(REDIS_WARNING,"Sorry: no support for backtrace().");
#endif
+ redisLogFromHandler(REDIS_WARNING,"--------\n");
+}
+
+/* Schedule a SIGALRM delivery after the specified period in milliseconds.
+ * If a timer is already scheduled, this function will re-schedule it to the
+ * specified time. If period is 0 the current timer is disabled. */
+void watchdogScheduleSignal(int period) {
+ struct itimerval it;
+
+ /* Will stop the timer if period is 0. */
+ it.it_value.tv_sec = period/1000;
+ it.it_value.tv_usec = (period%1000)*1000;
+ /* Don't automatically restart. */
+ it.it_interval.tv_sec = 0;
+ it.it_interval.tv_usec = 0;
+ setitimer(ITIMER_REAL, &it, NULL);
+}
+
+/* Enable the software watchdong with the specified period in milliseconds. */
+void enableWatchdog(int period) {
+ int min_period;
+
+ if (server.watchdog_period == 0) {
+ struct sigaction act;
+
+ /* Watchdog was actually disabled, so we have to setup the signal
+ * handler. */
+ sigemptyset(&act.sa_mask);
+ act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_SIGINFO;
+ act.sa_sigaction = watchdogSignalHandler;
+ sigaction(SIGALRM, &act, NULL);
+ }
+ /* If the configured period is smaller than twice the timer period, it is
+ * too short for the software watchdog to work reliably. Fix it now
+ * if needed. */
+ min_period = (1000/REDIS_HZ)*2;
+ if (period < min_period) period = min_period;
+ watchdogScheduleSignal(period); /* Adjust the current timer. */
+ server.watchdog_period = period;
+}
+
+/* Disable the software watchdog. */
+void disableWatchdog(void) {
+ struct sigaction act;
+ if (server.watchdog_period == 0) return; /* Already disabled. */
+ watchdogScheduleSignal(0); /* Stop the current timer. */
+
+ /* Set the signal handler to SIG_IGN, this will also remove pending
+ * signals from the queue. */
+ sigemptyset(&act.sa_mask);
+ act.sa_flags = 0;
+ act.sa_handler = SIG_IGN;
+ sigaction(SIGALRM, &act, NULL);
+ server.watchdog_period = 0;
}
projects / redis.git / blobdiff