1 /* SPDX-License-Identifier: MIT */
2 /*
3 * Check that a readv on a nonblocking socket queued before a writev doesn't
4 * wait for data to arrive.
5 */
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <stdint.h>
9 #include <assert.h>
10
11 #include <errno.h>
12 #include <fcntl.h>
13 #include <unistd.h>
14 #include <sys/socket.h>
15 #include <sys/un.h>
16 #include <netinet/tcp.h>
17 #include <netinet/in.h>
18 #include <arpa/inet.h>
19
20 #include "liburing.h"
21
main(int argc,char * argv[])22 int main(int argc, char *argv[])
23 {
24 int p_fd[2], ret;
25 int32_t recv_s0;
26 int32_t val = 1;
27 struct sockaddr_in addr;
28 struct iovec iov_r[1], iov_w[1];
29
30 if (argc > 1)
31 return 0;
32
33 srand(getpid());
34
35 recv_s0 = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_TCP);
36
37 ret = setsockopt(recv_s0, SOL_SOCKET, SO_REUSEPORT, &val, sizeof(val));
38 assert(ret != -1);
39 ret = setsockopt(recv_s0, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
40 assert(ret != -1);
41
42 addr.sin_family = AF_INET;
43 addr.sin_addr.s_addr = inet_addr("127.0.0.1");
44
45 do {
46 addr.sin_port = htons((rand() % 61440) + 4096);
47 ret = bind(recv_s0, (struct sockaddr*)&addr, sizeof(addr));
48 if (!ret)
49 break;
50 if (errno != EADDRINUSE) {
51 perror("bind");
52 exit(1);
53 }
54 } while (1);
55
56 ret = listen(recv_s0, 128);
57 assert(ret != -1);
58
59 p_fd[1] = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_TCP);
60
61 val = 1;
62 ret = setsockopt(p_fd[1], IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
63 assert(ret != -1);
64
65 int32_t flags = fcntl(p_fd[1], F_GETFL, 0);
66 assert(flags != -1);
67
68 flags |= O_NONBLOCK;
69 ret = fcntl(p_fd[1], F_SETFL, flags);
70 assert(ret != -1);
71
72 ret = connect(p_fd[1], (struct sockaddr*)&addr, sizeof(addr));
73 assert(ret == -1);
74
75 p_fd[0] = accept(recv_s0, NULL, NULL);
76 assert(p_fd[0] != -1);
77
78 flags = fcntl(p_fd[0], F_GETFL, 0);
79 assert(flags != -1);
80
81 flags |= O_NONBLOCK;
82 ret = fcntl(p_fd[0], F_SETFL, flags);
83 assert(ret != -1);
84
85 while (1) {
86 int32_t code;
87 socklen_t code_len = sizeof(code);
88
89 ret = getsockopt(p_fd[1], SOL_SOCKET, SO_ERROR, &code, &code_len);
90 assert(ret != -1);
91
92 if (!code)
93 break;
94 }
95
96 struct io_uring m_io_uring;
97 struct io_uring_params p = { };
98
99 ret = io_uring_queue_init_params(32, &m_io_uring, &p);
100 assert(ret >= 0);
101
102 if (p.features & IORING_FEAT_FAST_POLL)
103 return 0;
104
105 char recv_buff[128];
106 char send_buff[128];
107
108 {
109 iov_r[0].iov_base = recv_buff;
110 iov_r[0].iov_len = sizeof(recv_buff);
111
112 struct io_uring_sqe* sqe = io_uring_get_sqe(&m_io_uring);
113 assert(sqe != NULL);
114
115 io_uring_prep_readv(sqe, p_fd[0], iov_r, 1, 0);
116 sqe->user_data = 1;
117 }
118
119 {
120 iov_w[0].iov_base = send_buff;
121 iov_w[0].iov_len = sizeof(send_buff);
122
123 struct io_uring_sqe* sqe = io_uring_get_sqe(&m_io_uring);
124 assert(sqe != NULL);
125
126 io_uring_prep_writev(sqe, p_fd[1], iov_w, 1, 0);
127 sqe->user_data = 2;
128 }
129
130 ret = io_uring_submit_and_wait(&m_io_uring, 2);
131 assert(ret != -1);
132
133 struct io_uring_cqe* cqe;
134 uint32_t head;
135 uint32_t count = 0;
136
137 while (count != 2) {
138 io_uring_for_each_cqe(&m_io_uring, head, cqe) {
139 if (cqe->user_data == 2 && cqe->res != 128) {
140 fprintf(stderr, "write=%d\n", cqe->res);
141 goto err;
142 } else if (cqe->user_data == 1 && cqe->res != -EAGAIN) {
143 fprintf(stderr, "read=%d\n", cqe->res);
144 goto err;
145 }
146 count++;
147 }
148
149 assert(count <= 2);
150 io_uring_cq_advance(&m_io_uring, count);
151 }
152
153 io_uring_queue_exit(&m_io_uring);
154 return 0;
155 err:
156 io_uring_queue_exit(&m_io_uring);
157 return 1;
158 }
159