scron

commit 1972b52dc1d5ffc7c0f2c4ab369c73ffb4bc58d1
parent 03cdcc59b01d156c53f8e4a881972717f4574278
Author: Ari Malinen <ari.malinen@gmail.com>
Date:   Tue, 10 Jun 2014 17:52:38 +0300

detect min,hour,mday,mon and wday

Diffstat:
A
Makefile
 | 
16
++++++++++++++++
A
cron.conf
 | 
4
++++
D
crontab
 | 
6
------
M
dcron.c
 | 
63
++++++++++++++++++++++++++++++++++++++++++++++++---------------

4 files changed, 68 insertions(+), 21 deletions(-)
diff --git a/Makefile b/Makefile
@@ -0,0 +1,16 @@
+CC=gcc
+CFLAGS=-Wall
+PREFIX=/usr
+BINDIR=${PREFIX}/bin
+
+all: dcron
+
+install: dcron
+	mkdir -p ${DESTDIR}${BINDIR}
+	install -m 755 dcron ${DESTDIR}${BINDIR}
+
+uninstall:
+	rm -f ${DESTDIR}${BINDIR}/dcron
+
+clean:
+	rm dcron
diff --git a/cron.conf b/cron.conf
@@ -0,0 +1,4 @@
+# min,hour,mday,mon,wday,command
+39	17	*	*	*	exec nice emerge --sync --quiet
+40	*	*	*	*	exec nice mandb --quiet
+41	*	*	*	*	exec ionice -n2 updatedb
diff --git a/crontab b/crontab
@@ -1,6 +0,0 @@
-# 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
@@ -2,16 +2,19 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
+#include <ctype.h>
 #include <unistd.h>
 
 #define MAXLEN 100
 
+static const char config[]  = "cron.conf";
+
 int main(void) {
 	FILE *fp;
 	char line[MAXLEN+1];
-	char *col;
 	char cmd[MAXLEN+1];
-	int i, min, hour;
+	char *col;
+	int i, min, hour, mday, mon, wday;
 	time_t rawtime;
 	struct tm *tmtime;
 
@@ -23,10 +26,11 @@ int main(void) {
 				tmtime->tm_hour, tmtime->tm_min,
 				tmtime->tm_mday, tmtime->tm_mon, tmtime->tm_year+1900);
 
-		fp = fopen("crontab", "r");
+		fp = fopen(config, "r");
 		if (fp == NULL) {
-			fprintf(stderr, "cant read crontab\n");
-			exit(1);
+			fprintf(stderr, "error: cant read %s\n", config);
+			sleep(60);
+			continue;
 		}
 
 		while (fgets(line, MAXLEN+1, fp) != NULL) {
@@ -37,35 +41,64 @@ int main(void) {
 			} else {
 				// split line
 				i = 0;
-				col = strtok (line,"\t");
+				col = strtok(line,"\t");
 				while (col != NULL) {
-					// parse tasks
 					switch (i) {
 						case 0:
-							min = strtol(col, NULL, 0);
+							if (isalnum(col[0]))
+								min = strtol(col, NULL, 0);
+							else
+								min = -1;
 							break;
 						case 1:
-							hour = strtol(col, NULL, 0);
+							if (isalnum(col[0]))
+								hour = strtol(col, NULL, 0);
+							else
+								hour = -1;
+							break;
+						case 2:
+							if (isalnum(col[0]))
+								mday = strtol(col, NULL, 0);
+							else
+								mday = -1;
+							break;
+						case 3:
+							if (isalnum(col[0]))
+								mon = strtol(col, NULL, 0);
+							else
+								mon = -1;
+							break;
+						case 4:
+							if (isalnum(col[0]))
+								wday = strtol(col, NULL, 0);
+							else
+								wday = -1;
 							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);
+				// run task
+				if (min == -1 || min == tmtime->tm_min) {
+					if (hour == -1 || hour == tmtime->tm_hour) {
+						if (mday == -1 || mday == tmtime->tm_mday) {
+							if (mon == -1 || mon == tmtime->tm_mon) {
+								if (wday == -1 || wday == tmtime->tm_wday) {
+									printf("run: %s", cmd);
+									// system(cmd);
+								}
+							}
+						}
+					}
 				}
 			}
 		}
-
 		sleep(60);
 	}
-
 	fclose(fp);
 	return 0;
 }