initial commit

2 files changed, 84 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..8df6369
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,6 @@
+
+pingu: pingu.c
+	$(CC) -o $@ $^
+
+clean:
+	rm -f pingu
diff --git a/pingu.c b/pingu.c
new file mode 100644
index 0000000..8bf0100
--- /dev/null
+++ b/pingu.c
@@ -0,0 +1,78 @@
+
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+void *xmalloc(size_t size)
+{
+	void *p = malloc(size);
+	if (p == NULL)
+		err(EXIT_FAILURE, "malloc");
+	return p;
+}
+
+static int ping(const char *host)
+{
+	char cmd[280];
+	snprintf(cmd, sizeof(cmd), "ping -c 1 -q %s", host);
+	return system(cmd);
+}
+
+void usage(int retcode)
+{
+	fprintf(stderr, "usage:\n");
+	exit(retcode);
+}
+
+void ping_loop(char *hosts[], int offline[], int count, int interval)
+{
+	int i;
+	while (1) {
+		for (i = 0; i < count; i++) {
+			int status = (ping(hosts[i]) != 0);
+			if (status != offline[i]) {
+				offline[i] = status;
+				printf("status changed for %s to %i\n",
+					hosts[i], status);
+			}
+		}
+		sleep(interval);
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	int c;
+	char **hosts;
+	int *offline;
+	int hosts_count;
+	int interval = 30;
+	const char *script = NULL;
+
+	while ((c = getopt(argc, argv, "i:s:")) != -1) {
+		switch (c) {
+		case 's':
+			script = optarg;
+			break;
+		case 'i':
+			interval = atoi(optarg);
+			break;
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if (argc == 0)
+		usage(EXIT_FAILURE);
+
+	offline = xmalloc(sizeof(int) * argc);
+	memset(offline, 0, sizeof(int) * argc);
+
+	ping_loop(argv, offline, argc, interval);
+
+	free(hosts);
+	return 0;
+}