Initial svcok

1 files changed, 36 insertions, 0 deletions

diff --git a/svcok.c b/svcok.c
index e69de29..9919f80 100644
--- a/svcok.c
+++ b/svcok.c
@@ -0,0 +1,36 @@
+#include <err.h>
+#include <errno.h>
+#include <sys/file.h>
+#include <unistd.h>
+
+char *dir = ".";
+
+int
+main(int argc, char **argv)
+{
+	int fd;
+
+	if (argc > 1)
+		dir = argv[1];
+
+	if (chdir(dir) == -1)
+		err(1, "chdir()");
+
+	fd = open("supervise/lock", O_RDONLY);
+	if (fd == -1) {
+		if (errno == ENOENT)
+			exit(100);
+		else
+			err(1, "open()");
+	}
+
+	if (flock(fd, LOCK_EX | LOCK_NB) == -1) {
+		if (errno == EWOULDBLOCK)
+			exit(0);
+		else
+			err(1, "flock()");
+	} else 
+		exit(100);
+
+	return 0; /* Not reached */
+}