scron

commit 03cdcc59b01d156c53f8e4a881972717f4574278
parent bf9345738769e9c4691014420c5ca260a8c78241
Author: Ari Malinen <ari.malinen@gmail.com>
Date:   Tue, 10 Jun 2014 16:43:26 +0300

first commit

Diffstat:
A
README
 | 
3
+++
D
README.md
 | 
4
----
A
crontab
 | 
6
++++++
A
dcron.c
 | 
71
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

4 files changed, 80 insertions(+), 4 deletions(-)
diff --git a/README b/README
@@ -0,0 +1,3 @@
+dcron - simple cron
+
+this is early prototype
diff --git a/README.md b/README.md
@@ -1,4 +0,0 @@
-dcron
-=====
-
-simple cron
diff --git a/crontab b/crontab
@@ -0,0 +1,6 @@
+# dcron
+
+# minute, hour, day of month, month, day of week, command
+41	16	*	*	*	exec nice emerge --sync --quiet
+42	16	*	*	*	exec nice mandb --quiet
+43	16	*	*	*	exec ionice -n2 updatedb
diff --git a/dcron.c b/dcron.c
@@ -0,0 +1,71 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#define MAXLEN 100
+
+int main(void) {
+	FILE *fp;
+	char line[MAXLEN+1];
+	char *col;
+	char cmd[MAXLEN+1];
+	int i, min, hour;
+	time_t rawtime;
+	struct tm *tmtime;
+
+	while (1) {
+		rawtime = time(NULL);
+		tmtime = localtime(&rawtime);
+		
+		printf("dcron %.2d:%.2d %.2d.%.2d.%.4d\n",
+				tmtime->tm_hour, tmtime->tm_min,
+				tmtime->tm_mday, tmtime->tm_mon, tmtime->tm_year+1900);
+
+		fp = fopen("crontab", "r");
+		if (fp == NULL) {
+			fprintf(stderr, "cant read crontab\n");
+			exit(1);
+		}
+
+		while (fgets(line, MAXLEN+1, fp) != NULL) {
+			if (line[1] == '\0') {
+				// empty line
+			} else if (line[0] == '\043') {
+				// comment
+			} else {
+				// split line
+				i = 0;
+				col = strtok (line,"\t");
+				while (col != NULL) {
+					// parse tasks
+					switch (i) {
+						case 0:
+							min = strtol(col, NULL, 0);
+							break;
+						case 1:
+							hour = strtol(col, NULL, 0);
+							break;
+						case 5:
+							strncpy(cmd, col, MAXLEN+1);
+							break;
+					}
+
+					col = strtok (NULL, "\t");
+					i++;
+				}
+
+				if (hour == tmtime->tm_hour && min == tmtime->tm_min) {
+					printf("run: %s", cmd);
+					// system(cmd);
+				}
+			}
+		}
+
+		sleep(60);
+	}
+
+	fclose(fp);
+	return 0;
+}