file_utils: add lxc_recv_nointr()

src/lxc/file_utils.c

@@ -117,6 +117,17 @@ again:
 	return ret;
 }
 
+ssize_t lxc_recv_nointr(int sockfd, void *buf, size_t len, int flags)
+{
+	ssize_t ret;
+again:
+	ret = recv(sockfd, buf, len, flags);
+	if (ret < 0 && errno == EINTR)
+		goto again;
+
+	return ret;
+}
+
 ssize_t lxc_read_nointr_expect(int fd, void *buf, size_t count, const void *expected_buf)
 {
 	ssize_t ret;

src/lxc/file_utils.h

@@ -40,6 +40,8 @@ extern ssize_t lxc_write_nointr(int fd, const void *buf, size_t count);
 extern ssize_t lxc_read_nointr(int fd, void *buf, size_t count);
 extern ssize_t lxc_read_nointr_expect(int fd, void *buf, size_t count,
 				      const void *expected_buf);
+extern ssize_t lxc_recv_nointr(int sockfd, void *buf, size_t len, int flags);
+
 extern bool file_exists(const char *f);
 extern int print_to_file(const char *file, const char *content);
 extern int is_dir(const char *path);