1 files changed, 121 insertions, 0 deletions
diff --git a/source4/build/tests/fcntl_lock.c b/source4/build/tests/fcntl_lock.c
new file mode 100644
index 0000000000..3dc12a3897
--- /dev/null
+++ b/source4/build/tests/fcntl_lock.c
@@ -0,0 +1,121 @@
+/* test whether fcntl locking works on this system */
+
+#if defined(HAVE_UNISTD_H)
+#include <unistd.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+
+#ifdef HAVE_SYS_FCNTL_H
+#include <sys/fcntl.h>
+#endif
+
+#ifdef HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+
+#include <errno.h>
+
+static int sys_waitpid(pid_t pid,int *status,int options)
+{
+#ifdef HAVE_WAITPID
+  return waitpid(pid,status,options);
+#else /* USE_WAITPID */
+  return wait4(pid, status, options, NULL);
+#endif /* USE_WAITPID */
+}
+
+#define DATA "conftest.fcntl"
+
+#ifndef SEEK_SET
+#define SEEK_SET 0
+#endif
+
+/* lock a byte range in a open file */
+int main(int argc, char *argv[])
+{
+	struct flock lock;
+	int fd, ret, status=1;
+	pid_t pid;
+	char *testdir = NULL;
+
+	testdir = getenv("TESTDIR");
+	if (testdir) chdir(testdir);
+
+	alarm(10);
+
+	if (!(pid=fork())) {
+		sleep(2);
+		fd = open(DATA, O_RDONLY);
+
+		if (fd == -1) {
+			fprintf(stderr,"ERROR: failed to open %s (errno=%d)\n", 
+				DATA, (int)errno);
+			exit(1);
+		}
+
+		lock.l_type = F_WRLCK;
+		lock.l_whence = SEEK_SET;
+		lock.l_start = 0;
+		lock.l_len = 4;
+		lock.l_pid = getpid();
+		
+		lock.l_type = F_WRLCK;
+		
+		/* check if a lock applies */
+		ret = fcntl(fd,F_GETLK,&lock);
+
+		if ((ret == -1) ||
+		    (lock.l_type == F_UNLCK)) {
+			fprintf(stderr,"ERROR: lock test failed (ret=%d errno=%d)\n", ret, (int)errno);
+			exit(1);
+		} else {
+			exit(0);
+		}
+	}
+
+	unlink(DATA);
+	fd = open(DATA, O_RDWR|O_CREAT|O_EXCL, 0600);
+
+	if (fd == -1) {
+		fprintf(stderr,"ERROR: failed to open %s (errno=%d)\n", 
+			DATA, (int)errno);
+		exit(1);
+	}
+
+	lock.l_type = F_WRLCK;
+	lock.l_whence = SEEK_SET;
+	lock.l_start = 0;
+	lock.l_len = 4;
+	lock.l_pid = getpid();
+
+	/* set a 4 byte write lock */
+	fcntl(fd,F_SETLK,&lock);
+
+	sys_waitpid(pid, &status, 0);
+
+	unlink(DATA);
+
+#if defined(WIFEXITED) && defined(WEXITSTATUS)
+    if(WIFEXITED(status)) {
+        status = WEXITSTATUS(status);
+    } else {
+        status = 1;
+    }
+#else /* defined(WIFEXITED) && defined(WEXITSTATUS) */
+	status = (status == 0) ? 0 : 1;
+#endif /* defined(WIFEXITED) && defined(WEXITSTATUS) */
+
+	if (status) {
+		fprintf(stderr,"ERROR: lock test failed with status=%d\n", 
+			status);
+	}
+
+	exit(status);
+}