Log all output to a logfile, display all warnings, and use locking to prevent overlapped messages

src/ckpool.c

@@ -7,6 +7,8 @@
  * any later version.  See COPYING for more details.
  */
 
+#include "config.h"
+
 #include <sys/ioctl.h>
 #include <sys/prctl.h>
 #include <sys/socket.h>
@@ -216,6 +218,7 @@ static void clean_up(ckpool_t *ckp)
 	for (i = 0; i < children; i++)
 		dealloc(ckp->children[i]);
 	dealloc(ckp->children);
+	fclose(ckp->logfp);
 }
 
 static void __shutdown_children(ckpool_t *ckp, int sig)
@@ -436,7 +439,7 @@ int main(int argc, char **argv)
 {
 	struct sigaction handler;
 	int len, c, ret, i;
-	char buf[16] = {};
+	char buf[512] = {};
 	ckpool_t ckp;
 
 	global_ckp = &ckp;
@@ -479,6 +482,8 @@ int main(int argc, char **argv)
 	}
 	snprintf(buf, 15, "%s", ckp.name);
 	prctl(PR_SET_NAME, buf, 0, 0, 0);
+	memset(buf, 0, 15);
+
 	if (!ckp.config) {
 		ckp.config = strdup(ckp.name);
 		realloc_strcat(&ckp.config, ".conf");
@@ -532,6 +537,7 @@ int main(int argc, char **argv)
 	if (ckp.proxy && !ckp.proxies)
 		quit(0, "No proxy entries found in config file %s", ckp.config);
 
+	/* Create the log directory */
 	len = strlen(ckp.logdir);
 	if (memcmp(&ckp.logdir[len], "/", 1))
 		realloc_strcat(&ckp.logdir, "/");
@@ -539,6 +545,13 @@ int main(int argc, char **argv)
 	if (ret && errno != EEXIST)
 		quit(1, "Failed to make log directory %s", ckp.logdir);
 
+	/* Create the logfile */
+	sprintf(buf, "%s%s.log", ckp.logdir, ckp.name);
+	ckp.logfp = fopen(buf, "a");
+	if (!ckp.logfp)
+		quit(1, "Failed to make open log file %s", buf);
+	ckp.logfd = fileno(ckp.logfp);
+
 	ckp.main.ckp = &ckp;
 	ckp.main.processname = strdup("main");
 	ckp.main.sockname = strdup("listener");

src/ckpool.h

@@ -12,6 +12,8 @@
 
 #include "config.h"
 
+#include <sys/file.h>
+
 #include "libckpool.h"
 #include "uthash.h"
 
@@ -56,6 +58,9 @@ struct ckpool_instance {
 	char *socket_dir;
 	/* Directory where logs are written */
 	char *logdir;
+	/* Logfile */
+	FILE *logfp;
+	int logfd;
 
 	/* Process instance data of parent/child processes */
 	proc_instance_t main;
@@ -105,26 +110,41 @@ ckpool_t *global_ckp;
 
 int process_exit(ckpool_t *ckp, proc_instance_t *pi, int ret);
 
-/* Placeholders for when we have more comprehensive logging facilities */
-
+/* Log everything to the logfile, but display warnings on the console as well */
 #define LOGMSG(_loglevel, fmt, ...) do { \
 	if (global_ckp->loglevel >= _loglevel && fmt) { \
 		struct tm *tm; \
+		char *buf = NULL; \
+		asprintf(&buf, fmt, ##__VA_ARGS__); \
 		time_t now_t; \
 		now_t = time(NULL); \
 		tm = localtime(&now_t); \
-		fprintf(stderr, "[%d-%02d-%02d %02d:%02d:%02d] ", \
+		flock(global_ckp->logfd, LOCK_EX); \
+		fprintf(global_ckp->logfp, "[%d-%02d-%02d %02d:%02d:%02d] %s", \
 			tm->tm_year + 1900, \
 			tm->tm_mon + 1, \
 			tm->tm_mday, \
 			tm->tm_hour, \
 			tm->tm_min, \
-			tm->tm_sec); \
-		fprintf(stderr, fmt, ##__VA_ARGS__); \
+			tm->tm_sec, \
+			buf); \
 		if (_loglevel <= LOG_ERR) \
-			fprintf(stderr, " with errno %d: %s", errno, strerror(errno)); \
-		fprintf(stderr, "\n"); \
-		fflush(stderr); \
+			fprintf(global_ckp->logfp, " with errno %d: %s", errno, strerror(errno)); \
+		fprintf(global_ckp->logfp, "\n"); \
+		if (_loglevel <= LOG_WARNING) \
+			fprintf(stderr, "%s\n", buf); \
+		fflush(NULL); \
+		flock(global_ckp->logfd, LOCK_UN); \
+		free(buf); \
+	} \
+} while (0)
+
+#define LOGBOTH(_loglevel, fmt, ...) do { \
+	if (global_ckp->loglevel >= _loglevel && fmt) { \
+		char *buf = NULL; \
+		asprintf(&buf, fmt, ##__VA_ARGS__); \
+		printf("%s\n", buf); \
+		free(buf); \
 	} \
 } while (0)