[6c6e36c] | 1 | #include <assert.h> |
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| 2 | #include <stdio.h> |
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| 3 | #include <stdlib.h> |
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| 4 | #include <string.h> |
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| 5 | |
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| 6 | #include <unistd.h> |
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| 7 | |
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| 8 | #include <sys/types.h> |
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| 9 | #include <sys/socket.h> |
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| 10 | #include <netinet/in.h> |
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| 11 | |
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| 12 | #include <liburing.h> |
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| 13 | |
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| 14 | struct io_uring ring; |
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| 15 | |
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| 16 | char data[256]; |
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| 17 | struct iovec iov = { data, 256 }; |
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| 18 | struct msghdr msg = { "", 0, &iov, 1, NULL, 0, 0 }; |
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| 19 | static void async_read(int sock) { |
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| 20 | /* get an sqe and fill in a READ operation */ |
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| 21 | struct io_uring_sqe * sqe = io_uring_get_sqe(&ring); |
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| 22 | io_uring_prep_recvmsg(sqe, sock, &msg, 0); |
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| 23 | sqe->user_data = 0; |
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| 24 | |
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| 25 | /* tell the kernel we have an sqe ready for consumption */ |
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| 26 | int ret = io_uring_submit(&ring); |
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| 27 | assert(ret == 1); |
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| 28 | } |
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| 29 | |
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| 30 | int main(int argc, char *argv[]) { |
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| 31 | if(argc != 2) { |
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| 32 | printf("usage: %s portnumber\n", argv[0]); |
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| 33 | exit( EXIT_FAILURE ); |
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| 34 | } |
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| 35 | int port = atoi(argv[1]); |
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| 36 | if(port < 1) { |
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| 37 | printf("Invalid port : %d (from %s)\n", port, argv[1]); |
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| 38 | exit( EXIT_FAILURE ); |
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| 39 | } |
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| 40 | |
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| 41 | int sock = socket(AF_INET, SOCK_STREAM, 0); |
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| 42 | if(sock < 0) { |
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| 43 | perror( "socket" ); |
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| 44 | exit( EXIT_FAILURE ); |
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| 45 | } |
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| 46 | |
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| 47 | struct sockaddr_in serv_addr; |
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| 48 | memset(&serv_addr, 0, sizeof(serv_addr)); |
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| 49 | serv_addr.sin_family = AF_INET; |
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| 50 | serv_addr.sin_addr.s_addr = INADDR_ANY; |
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| 51 | serv_addr.sin_port = htons(port); |
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| 52 | |
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| 53 | int ret = bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)); |
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| 54 | if(ret < 0) { |
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| 55 | perror( "bind" ); |
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| 56 | exit( EXIT_FAILURE ); |
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| 57 | } |
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| 58 | |
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| 59 | |
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| 60 | listen(sock,1); |
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| 61 | |
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| 62 | struct sockaddr_in cli_addr; |
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| 63 | __socklen_t clilen = sizeof(cli_addr); |
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| 64 | int newsock = accept(sock, (struct sockaddr *) &cli_addr, &clilen); |
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| 65 | if (newsock < 0) { |
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| 66 | perror( "accept" ); |
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| 67 | exit( EXIT_FAILURE ); |
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| 68 | } |
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| 69 | |
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| 70 | io_uring_queue_init( 16, &ring, 0 ); |
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| 71 | |
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| 72 | async_read( newsock ); |
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| 73 | |
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| 74 | while(1) { |
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| 75 | struct io_uring_cqe * cqe; |
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| 76 | struct __kernel_timespec ts = { 2, 0 }; |
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| 77 | // int ret = io_uring_wait_cqes( &ring, &cqe, 1, &ts, NULL); // Requires Linux 5.4 |
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| 78 | int ret = io_uring_wait_cqe( &ring, &cqe ); |
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| 79 | |
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| 80 | if( ret < 0 ) { |
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| 81 | printf( "Main Loop Error : %s\n", strerror(-ret) ); |
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| 82 | close( sock ); |
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| 83 | exit( EXIT_FAILURE ); |
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| 84 | } |
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| 85 | |
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| 86 | switch(cqe->user_data) { |
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| 87 | // Read completed |
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| 88 | case 0: |
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| 89 | // If it is the end of file we are done |
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| 90 | if( cqe->res == 0 ) { |
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| 91 | goto END; |
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| 92 | } |
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| 93 | |
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| 94 | if( cqe->res < 0 ) { |
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| 95 | perror( "Main Loop Error" ); |
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| 96 | close( sock ); |
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| 97 | exit( EXIT_FAILURE ); |
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| 98 | } |
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| 99 | |
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| 100 | printf("'%.*s'\n", cqe->res, data); |
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| 101 | |
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| 102 | async_read( newsock ); |
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| 103 | |
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| 104 | // otherwise prepare a new read |
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| 105 | break; |
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| 106 | // Wait timed out, time to print |
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| 107 | // Requires Linux 5.4 |
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| 108 | case LIBURING_UDATA_TIMEOUT: |
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| 109 | printf("."); |
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| 110 | break; |
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| 111 | // Problem |
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| 112 | default: |
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| 113 | printf("Unexpected user data : %llu", cqe->user_data); |
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| 114 | exit( EXIT_FAILURE ); |
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| 115 | } |
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| 116 | |
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| 117 | io_uring_cqe_seen( &ring, cqe ); |
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| 118 | } |
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| 119 | END: |
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| 120 | |
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| 121 | io_uring_queue_exit( &ring ); |
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| 122 | |
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| 123 | ret = close(newsock); |
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| 124 | if(ret < 0) { |
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| 125 | perror( "close new" ); |
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| 126 | exit( EXIT_FAILURE ); |
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| 127 | } |
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| 128 | |
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| 129 | ret = close(sock); |
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| 130 | if(ret < 0) { |
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| 131 | perror( "close old" ); |
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| 132 | exit( EXIT_FAILURE ); |
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| 133 | } |
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| 134 | |
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| 135 | return 0; |
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| 136 | } |
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