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-rw-r--r--tests/fcntl_lock_thread.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/tests/fcntl_lock_thread.c b/tests/fcntl_lock_thread.c
new file mode 100644
index 0000000..e341514
--- /dev/null
+++ b/tests/fcntl_lock_thread.c
@@ -0,0 +1,117 @@
+/* test whether fcntl locking works between threads on this Linux system */
+
+#include <unistd.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+#include <fcntl.h>
+
+#include <sys/fcntl.h>
+
+#include <sys/wait.h>
+
+#include <errno.h>
+#include <pthread.h>
+
+#define DATA "conftest.fcntl"
+
+#define SEEK_SET 0
+
+static void *test_thread(void *thread_parm)
+{
+ int *status = thread_parm;
+ int fd, ret;
+ struct flock lock;
+
+ sleep(2);
+ fd = open(DATA, O_RDWR);
+
+ if (fd == -1) {
+ fprintf(stderr,"ERROR: failed to open %s (errno=%d)\n",
+ DATA, (int)errno);
+ pthread_exit(thread_parm);
+ }
+
+ lock.l_type = F_WRLCK;
+ lock.l_whence = SEEK_SET;
+ lock.l_start = 0;
+ lock.l_len = 4;
+ lock.l_pid = 0;
+
+ /* check if a lock applies */
+ ret = fcntl(fd,F_SETLK,&lock);
+ if ((ret != -1)) {
+ fprintf(stderr,"ERROR: lock test failed (ret=%d errno=%d)\n", ret, (int)errno);
+ } else {
+ *status = 0; /* SUCCESS! */
+ }
+ pthread_exit(thread_parm);
+}
+
+/* lock a byte range in a open file */
+int main(int argc, char *argv[])
+{
+ struct flock lock;
+ int fd, ret, status=1, rc;
+ pid_t pid;
+ char *testdir = NULL;
+ pthread_t thread_id;
+ pthread_attr_t thread_attr;
+
+ testdir = getenv("TESTDIR");
+ if (testdir) chdir(testdir);
+
+ alarm(10);
+
+ pthread_attr_init(&thread_attr);
+ pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED);
+ rc = pthread_create(&thread_id, &thread_attr, &test_thread, &status);
+ pthread_attr_destroy(&thread_attr);
+ if (rc == 0) {
+ fprintf(stderr,"created thread_id=%lu\n",
+ (unsigned long int)thread_id);
+ } else {
+ fprintf(stderr,"ERROR: thread create failed, rc=%d\n", rc);
+ }
+
+ unlink(DATA);
+ fd = open(DATA, O_RDWR|O_CREAT|O_RDWR, 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);
+
+ sleep(4); /* allow thread to try getting lock */
+
+ 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);
+}