| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: tx-socket.c,v 1.2 2002/01/30 09:25:35 mdw Exp $ |
| 4 | * |
| 5 | * Socket transport |
| 6 | * |
| 7 | * (c) 2001 Mark Wooding |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of Jog: Programming for a jogging machine. |
| 13 | * |
| 14 | * Jog is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * Jog is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with Jog; if not, write to the Free Software Foundation, |
| 26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 27 | */ |
| 28 | |
| 29 | /*----- Header files ------------------------------------------------------*/ |
| 30 | |
| 31 | #ifdef HAVE_CONFIG_H |
| 32 | # include "config.h" |
| 33 | #endif |
| 34 | |
| 35 | #include <errno.h> |
| 36 | #include <stddef.h> |
| 37 | #include <stdio.h> |
| 38 | #include <stdlib.h> |
| 39 | #include <string.h> |
| 40 | |
| 41 | #include <sys/types.h> |
| 42 | #include <unistd.h> |
| 43 | #include <sys/socket.h> |
| 44 | #include <sys/un.h> |
| 45 | #include <pthread.h> |
| 46 | |
| 47 | #include <mLib/alloc.h> |
| 48 | #include <mLib/darray.h> |
| 49 | #include <mLib/sub.h> |
| 50 | |
| 51 | #include "err.h" |
| 52 | #include "txport.h" |
| 53 | #include "tx-socket.h" |
| 54 | |
| 55 | #undef sun |
| 56 | |
| 57 | /*----- Data structures ---------------------------------------------------*/ |
| 58 | |
| 59 | typedef struct txsock { |
| 60 | txport tx; /* Transport base */ |
| 61 | int fd; /* File descriptor */ |
| 62 | } txsock; |
| 63 | |
| 64 | /*----- Main code ---------------------------------------------------------*/ |
| 65 | |
| 66 | /* --- @txsock_create@ --- * |
| 67 | * |
| 68 | * Arguments: @const char *file@ = filename for socket |
| 69 | * |
| 70 | * Returns: Pointer to created transport block. |
| 71 | * |
| 72 | * Use: Creates a socket transport. |
| 73 | */ |
| 74 | |
| 75 | txport *txsock_create(const char *file) |
| 76 | { |
| 77 | txsock *tx; |
| 78 | int fd; |
| 79 | struct sockaddr_un *sun; |
| 80 | size_t len, sunsz; |
| 81 | |
| 82 | /* --- Set up the address block --- */ |
| 83 | |
| 84 | len = strlen(file) + 1; |
| 85 | sunsz = offsetof(struct sockaddr_un, sun_path) + len; |
| 86 | sun = xmalloc(sunsz); |
| 87 | sun->sun_family = AF_UNIX; |
| 88 | memcpy(sun->sun_path, file, len); |
| 89 | |
| 90 | /* --- Create the socket --- */ |
| 91 | |
| 92 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { |
| 93 | err_report(ERR_TXPORT, ERRTX_CREATE, errno, |
| 94 | "error creating socket: %s", strerror(errno)); |
| 95 | goto fail_0; |
| 96 | } |
| 97 | |
| 98 | /* --- Connect --- */ |
| 99 | |
| 100 | if (connect(fd, (struct sockaddr *)sun, sunsz)) { |
| 101 | err_report(ERR_TXPORT, ERRTX_CREATE, errno, |
| 102 | "couldn't connect to `%s': %s", file, strerror(errno)); |
| 103 | goto fail_1; |
| 104 | } |
| 105 | |
| 106 | /* --- Done --- */ |
| 107 | |
| 108 | tx = CREATE(txsock); |
| 109 | tx->fd = fd; |
| 110 | xfree(sun); |
| 111 | return (&tx->tx); |
| 112 | |
| 113 | /* --- Tidy up because it all went horribly wrong --- */ |
| 114 | |
| 115 | fail_1: |
| 116 | close(fd); |
| 117 | fail_0: |
| 118 | xfree(sun); |
| 119 | return (0); |
| 120 | } |
| 121 | |
| 122 | /* --- @txsock_write@ --- * |
| 123 | * |
| 124 | * Arguments: @txport *txg@ = pointer to transport context |
| 125 | * @const void *p@ = pointer to buffer |
| 126 | * @size_t sz@ = size of the buffer |
| 127 | * |
| 128 | * Returns: Number of bytes written, or @-1@ on error. |
| 129 | * |
| 130 | * Use: Writes data to a transport. |
| 131 | */ |
| 132 | |
| 133 | ssize_t txsock_write(txport *txg, const void *p, size_t sz) |
| 134 | { |
| 135 | txsock *tx = (txsock *)txg; |
| 136 | |
| 137 | return (write(tx->fd, p, sz)); |
| 138 | } |
| 139 | |
| 140 | /* --- @txsock_fetch@ --- * |
| 141 | * |
| 142 | * Arguments: @void *txv@ = pointer to transport context |
| 143 | * |
| 144 | * Returns: Nothing of interest. |
| 145 | * |
| 146 | * Use: Thread to fetch data from a socket. |
| 147 | */ |
| 148 | |
| 149 | void *txsock_fetch(void *txv) |
| 150 | { |
| 151 | txsock *tx = txv; |
| 152 | unsigned char buf[BUFSIZ]; |
| 153 | ssize_t n; |
| 154 | int e; |
| 155 | |
| 156 | /* --- Read data while it arrives --- */ |
| 157 | |
| 158 | for (;;) { |
| 159 | n = read(tx->fd, buf, sizeof(buf)); |
| 160 | if (n < 0) { |
| 161 | err_report(ERR_TXPORT, ERRTX_READ, errno, |
| 162 | "error reading from socket: %s", strerror(errno)); |
| 163 | break; |
| 164 | } |
| 165 | if (!n) |
| 166 | break; |
| 167 | if ((e = pthread_mutex_lock(&tx->tx.mx)) != 0) { |
| 168 | err_report(ERR_TXPORT, ERRTX_READ, e, |
| 169 | "error locking mutex: %s", strerror(e)); |
| 170 | break; |
| 171 | } |
| 172 | DA_ENSURE(&tx->tx.buf, n); |
| 173 | memcpy(DA(&tx->tx.buf) + DA_LEN(&tx->tx.buf), buf, n); |
| 174 | DA_EXTEND(&tx->tx.buf, n); |
| 175 | pthread_cond_signal(&tx->tx.cv); |
| 176 | pthread_mutex_unlock(&tx->tx.mx); |
| 177 | } |
| 178 | |
| 179 | /* --- Deal with crapness --- */ |
| 180 | |
| 181 | e = pthread_mutex_lock(&tx->tx.mx); |
| 182 | tx->tx.s = TX_CLOSE; |
| 183 | pthread_cond_signal(&tx->tx.cv); |
| 184 | pthread_mutex_unlock(&tx->tx.mx); |
| 185 | return (0); |
| 186 | } |
| 187 | |
| 188 | /* --- @txsock_destroy@ --- * |
| 189 | * |
| 190 | * Arguments: @txport *txg@ = pointer to transport context |
| 191 | * |
| 192 | * Returns: --- |
| 193 | * |
| 194 | * Use: Destroys a socket transport. |
| 195 | */ |
| 196 | |
| 197 | void txsock_destroy(txport *txg) |
| 198 | { |
| 199 | txsock *tx = (txsock *)txg; |
| 200 | |
| 201 | close(tx->fd); |
| 202 | DESTROY(tx); |
| 203 | } |
| 204 | |
| 205 | /*----- That's all, folks -------------------------------------------------*/ |