+ 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) {
+ fcntl(fd[0], F_SETFD, FD_CLOEXEC);
+ fcntl(fd[1], F_SETFD, FD_CLOEXEC);
+ }
+ if (flag & O_NONBLOCK) {
+ fcntl(fd[0], F_SETFL, fcntl(fd[0], F_GETFL) | O_NONBLOCK);
+ fcntl(fd[1], F_SETFL, fcntl(fd[1], F_GETFL) | O_NONBLOCK);
+ }
+ return 0;