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test/self.c
91 строка
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Jens Axboe
test/self: skip if argument passed in
21 янв 2021, 16:05
21 янв 2021, 16:05
d247109
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/* SPDX-License-Identifier: MIT */ /* * Description: test that pathname resolution works from async context when * using /proc/self/ which should be the original submitting task, not the * async worker. * */ #include <errno.h> #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include "liburing.h" static int io_openat2(struct io_uring *ring, const char *path, int dfd) { struct io_uring_cqe *cqe; struct io_uring_sqe *sqe; struct open_how how; int ret; sqe = io_uring_get_sqe(ring); if (!sqe) { fprintf(stderr, "get sqe failed\n"); goto err; } memset(&how, 0, sizeof(how)); how.flags = O_RDONLY; io_uring_prep_openat2(sqe, dfd, path, &how); ret = io_uring_submit(ring); if (ret <= 0) { fprintf(stderr, "sqe submit failed: %d\n", ret); goto err; } ret = io_uring_wait_cqe(ring, &cqe); if (ret < 0) { fprintf(stderr, "wait completion %d\n", ret); goto err; } ret = cqe->res; io_uring_cqe_seen(ring, cqe); return ret; err: return -1; } int main(int argc, char *argv[]) { struct io_uring ring; char buf[64]; int ret; if (argc > 1) return 0; ret = io_uring_queue_init(1, &ring, 0); if (ret) { fprintf(stderr, "ring setup failed\n"); return 1; } ret = io_openat2(&ring, "/proc/self/comm", -1); if (ret < 0) { if (ret == -EOPNOTSUPP) return 0; if (ret == -EINVAL) { fprintf(stdout, "openat2 not supported, skipping\n"); return 0; } fprintf(stderr, "openat2 failed: %s\n", strerror(-ret)); return 1; } memset(buf, 0, sizeof(buf)); ret = read(ret, buf, sizeof(buf)); if (ret < 0) { perror("read"); return 1; } if (strncmp(buf, "self", 4)) { fprintf(stderr, "got comm=<%s>, wanted <self>\n", buf); return 1; } return 0; }