+ if (!flag) return syscall(SYS_pipe, fd);
+ int ret = __syscall(SYS_pipe2, fd, flag);
+ if (ret != -ENOSYS) return __syscall_ret(ret);
+ ret = __syscall(SYS_pipe, fd);
+ if (ret) return __syscall_ret(ret);
+ if (flag & O_CLOEXEC) {
+ __syscall(SYS_fcntl, fd[0], F_SETFD, FD_CLOEXEC);
+ __syscall(SYS_fcntl, fd[1], F_SETFD, FD_CLOEXEC);
+ }
+ if (flag & O_NONBLOCK) {
+ __syscall(SYS_fcntl, fd[0], F_SETFL, O_NONBLOCK);
+ __syscall(SYS_fcntl, fd[1], F_SETFL, O_NONBLOCK);
+ }
+ return 0;