scron

commit 9360a9f2c7247ea35f271a344a547dab4adec571
parent c2ae1254215fc15c8520ff88ddd620f594a7ef71
Author: Ari Malinen <ari.malinen@gmail.com>
Date:   Sun, 15 Jun 2014 19:15:06 +0300

improved error handling

Diffstat:
M
README
 | 
2
+-
D
cron.c
 | 
93
-------------------------------------------------------------------------------

2 files changed, 1 insertion(+), 94 deletions(-)
diff --git a/README b/README
@@ -16,7 +16,7 @@ Good error handling.
 
 usage
 -----
-usage: cron [options]
+usage: crond [options]
 -h        help
 -d        daemon
 -f <file> config file
diff --git a/cron.c b/cron.c
@@ -1,93 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
-#include <time.h>
-#include <unistd.h>
-#include <syslog.h>
-
-#define LEN 80
-
-int main(int argc, char *argv[]) {
-	char *ep, *col, line[LEN+1], config[LEN+1] = "/etc/crontab";
-	int i, j;
-	time_t t;
-	struct tm *tm;
-	FILE *fp;
-
-	openlog(argv[0], LOG_CONS | LOG_PID, LOG_LOCAL1);
-
-	for (i = 1; i < argc; i++) {
-		if (!strcmp("-d", argv[i])) {
-			if (fork() == 0) {
-				setsid();
-				fclose(stdin);
-				fclose(stdout);
-				fclose(stderr);
-			} else {
-				return 0;
-			}
-		} else if (!strcmp("-f", argv[i])) {
-			if (argv[i+1] == NULL || argv[i+1][0] == '-') {
-				fprintf(stderr, "error: -f needs parameter\n");
-				syslog(LOG_NOTICE, "error: -f needs parameter");
-				return 1;
-			}
-			strncpy(config, argv[++i], LEN);
-		} else {
-			fprintf(stderr, "usage: %s [options]\n", argv[0]);
-			fprintf(stderr, "-h        help\n");
-			fprintf(stderr, "-d        daemon\n");
-			fprintf(stderr, "-f <file> config file\n");
-			return 1;
-		}
-	}
-
-	while (1) {
-		t = time(NULL);
-		sleep(60 - t % 60);
-		t = time(NULL);
-		tm = localtime(&t);
-
-		if ((fp = fopen(config, "r")) == NULL) {
-			fprintf(stderr, "error: cant read %s\n", config);
-			syslog(LOG_NOTICE, "error: cant read %s", config);
-			continue;
-		}
-
-		for (i = 0; fgets(line, LEN+1, fp); i++) {
-			if (line[0] == '#' || line[0] == '\n')
-				continue;
-
-			for (j = 0, col = strtok(line,"\t"); col; j++, col = strtok(NULL, "\t")) {
-				ep = "";
-
-				if ((j == 0 && (col[0] == '*' || strtol(col, &ep, 0) == tm->tm_min) && *ep == '\0') ||
-					(j == 1 && (col[0] == '*' || strtol(col, &ep, 0) == tm->tm_hour) && *ep == '\0') ||
-					(j == 2 && (col[0] == '*' || strtol(col, &ep, 0) == tm->tm_mday) && *ep == '\0') ||
-					(j == 3 && (col[0] == '*' || strtol(col, &ep, 0) == tm->tm_mon) && *ep == '\0') ||
-					(j == 4 && (col[0] == '*' || strtol(col, &ep, 0) == tm->tm_wday) && *ep == '\0')) {
-					continue;
-				} else if (j == 5) {
-					printf("run: %s", col);
-					syslog(LOG_NOTICE, "run: %s", col);
-					if (fork() == 0) {
-						execl("/bin/sh", "/bin/sh", "-c", col, (char *) NULL);
-						fprintf(stderr, "error: job failed: %s", col);
-						syslog(LOG_NOTICE, "error: job failed: %s", col);
-					}
-				} else if (!isdigit(col[0]) || *col < 0 || *col > 59 || *ep != '\0') {
-					fprintf(stderr, "error: %s line %d column %d\n", config, i+1, j+1);
-					syslog(LOG_NOTICE, "error: %s line %d column %d", config, i+1, j+1);
-				}
-
-				break;
-			}
-		}
-
-		fclose(fp);
-	}
-
-	closelog();
-	return 0;
-}