2 files changed, 115 insertions, 0 deletions
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..1e50259
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,9 @@
+CFLAGS += -Wall
+
+all: squid-cronolog
+
+squid-cronolog: squid-cronolog.c
+	$(CC) $(CFLAGS) -o squid-cronolog squid-cronolog.c
+
+clean:
+	$(RM) squid-cronolog
diff --git a/squid-cronolog.c b/squid-cronolog.c
new file mode 100644
index 0000000..bfc5346
--- /dev/null
+++ b/squid-cronolog.c
@@ -0,0 +1,106 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <errno.h>
+#include <string.h>
+
+#define CRONOLOG "/usr/sbin/cronolog"
+
+char *pidfile;
+
+void die(int sig) {
+	/* kill off children */
+	kill(0, SIGTERM);
+	/* remove pid file, quit */
+	unlink(pidfile);
+	exit(0);
+}
+
+struct sigaction sigdie = { .sa_handler = die };
+
+int main(int argc, char *argv[]) {
+
+    time_t t = 0;
+    pid_t pid = 0;
+    int fd, pidfd, pidlen = 16;
+    char *fifo, *log, pidstr[16];
+
+    if (argc != 4) {
+        fprintf(stderr, "Usage: %s /path/to/pidfile /path/to/fifo"
+                " /path/to/logs/%%Y%%m%%d.log\n", argv[0]);
+        exit(1);
+    }
+
+    pidfile = argv[1];
+    fifo = argv[2];
+    log = argv[3];
+
+    /* Test for fifo access, leave open for use */
+    /* O_NONBLOCK allows us to fork into the background */
+    fd = open(fifo, O_RDONLY|O_NONBLOCK);
+    if (fd == -1) {
+        fprintf(stderr, "Cannot open fifo %s: %s\n", fifo, strerror(errno));
+        exit(1);
+    }
+
+    pid = fork();
+    
+    if (pid == 0) {
+        /* CHILD 0 */
+
+        /* Record pid to pidfile */
+        pidfd = open(pidfile, O_WRONLY|O_CREAT|O_EXCL, 0644);
+        if (pidfd == -1) {
+            fprintf(stderr, "Cannot create and open pid file %s: %s\n",
+	    	pidfile, strerror(errno));
+            exit(1);
+        } else {
+            pidlen = snprintf(pidstr, pidlen, "%d\n", getpid());
+	    write(pidfd, pidstr, pidlen);
+            close(pidfd);
+        }
+
+        /* close shell output */
+        close(0);
+        close(1);
+        close(2);
+
+	/* set a process group for easy cleanup */
+	setpgrp();
+	sigaction(SIGTERM, &sigdie, NULL);
+
+        /* keep the cronolog process open */
+        while (1) {
+            t = time(NULL);
+            pid = fork();
+            if (pid == 0) {
+                /* CHILD 1 */
+                
+		/* replace stdin with fifo */
+                dup2(fd, 0);
+		/* unset O_NONBLOCK */
+		fcntl(0, F_SETFL, 0);
+                /* exec cronolog */
+                execl(CRONOLOG, CRONOLOG, log, (char *) 0);
+		/* filure! give up on life */
+		exit(1);
+            } else {
+                /* PARENT 1 */
+                /* watch child 1 */
+                waitpid(pid, NULL, 0);
+                if (time(NULL) - t < 2) {
+                    /* restarting too fast, wait 10 seconds */
+                    sleep(10);
+                }
+            }
+        }
+    }
+
+    /* PARENT 0 exits */
+    close(fd);
+    return 0;
+}