Handle EINTR in tests

On an otherwise busy machine the test suite is quite flaky. Restart
the syscalls that are aborted with EINTR.

Signed-off-by: Dirk Müller <dirk@dmllr.de>
Link: https://lore.kernel.org/r/20220705132939.7744-1-dirk@dmllr.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

test/ce593a6c480a.c

@@ -111,7 +111,10 @@ int main(int argc, char *argv[])
 			(void*) (intptr_t) other_fd);
 
 	/* Wait on the event fd for an event to be ready */
-	ret = read(loop_fd, buf, 8);
+	do {
+		ret = read(loop_fd, buf, 8);
+	} while (ret < 0 && errno == EINTR);
+
 	if (ret < 0) {
 		perror("read");
 		return T_EXIT_FAIL;

test/io-cancel.c

@@ -365,8 +365,13 @@ static int test_cancel_req_across_fork(void)
 		exit(0);
 	} else {
 		int wstatus;
+		pid_t childpid;
 
-		if (waitpid(p, &wstatus, 0) == (pid_t)-1) {
+		do {
+			childpid = waitpid(p, &wstatus, 0);
+		} while (childpid == (pid_t)-1 && errno == EINTR);
+
+		if (childpid == (pid_t)-1) {
 			perror("waitpid()");
 			return 1;
 		}