mdw@git.distorted.org.uk Git - jog/blob - tx-socket.c

   1 /* -*-c-*-
   2  *
   3  * $Id: tx-socket.c,v 1.1 2002/01/25 19:34:45 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 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: tx-socket.c,v $
  32  * Revision 1.1  2002/01/25 19:34:45  mdw
  33  * Initial revision
  34  *
  35  */
  36
  37 /*----- Header files ------------------------------------------------------*/
  38
  39 #ifdef HAVE_CONFIG_H
  40 #  include "config.h"
  41 #endif
  42
  43 #include <errno.h>
  44 #include <stddef.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48
  49 #include <sys/types.h>
  50 #include <unistd.h>
  51 #include <sys/socket.h>
  52 #include <sys/un.h>
  53 #include <pthread.h>
  54
  55 #include <mLib/alloc.h>
  56 #include <mLib/darray.h>
  57 #include <mLib/sub.h>
  58
  59 #include "err.h"
  60 #include "txport.h"
  61 #include "tx-socket.h"
  62
  63 #undef sun
  64
  65 /*----- Data structures ---------------------------------------------------*/
  66
  67 typedef struct txsock {
  68   txport tx;                            /* Transport base */
  69   int fd;                               /* File descriptor */
  70 } txsock;
  71
  72 /*----- Main code ---------------------------------------------------------*/
  73
  74 /* --- @txsock_create@ --- *
  75  *
  76  * Arguments:   @const char *file@ = filename for socket
  77  *              @const char *config@ = configuration string
  78  *
  79  * Returns:     Pointer to created transport block.
  80  *
  81  * Use:         Creates a socket transport.
  82  */
  83
  84 txport *txsock_create(const char *file, const char *config)
  85 {
  86   txsock *tx;
  87   int fd;
  88   struct sockaddr_un *sun;
  89   size_t len, sunsz;
  90
  91   /* --- Parse the configuration --- */
  92
  93   if (config && *config) {
  94     err_report(ERR_TXPORT, ERRTX_CONFIG, 0,
  95                "bad configuration for socket transport");
  96     goto fail_0;
  97   }
  98
  99   /* --- Set up the address block --- */
 100
 101   len = strlen(file) + 1;
 102   sunsz = offsetof(struct sockaddr_un, sun_path) + len;
 103   sun = xmalloc(sunsz);
 104   sun->sun_family = AF_UNIX;
 105   memcpy(sun->sun_path, file, len);
 106
 107   /* --- Create the socket --- */
 108
 109   if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
 110     err_report(ERR_TXPORT, ERRTX_CREATE, errno,
 111                "error creating socket: %s", strerror(errno));
 112     goto fail_1;
 113   }
 114
 115   /* --- Connect --- */
 116
 117   if (connect(fd, (struct sockaddr *)sun, sunsz)) {
 118     err_report(ERR_TXPORT, ERRTX_CREATE, errno,
 119                "couldn't connect to `%s': %s", file, strerror(errno));
 120     goto fail_2;
 121   }
 122
 123   /* --- Done --- */
 124
 125   tx = CREATE(txsock);
 126   tx->fd = fd;
 127   xfree(sun);
 128   return (&tx->tx);
 129
 130   /* --- Tidy up because it all went horribly wrong --- */
 131
 132 fail_2:
 133   close(fd);
 134 fail_1:
 135   xfree(sun);
 136 fail_0:
 137   return (0);
 138 }
 139
 140 /* --- @txsock_write@ --- *
 141  *
 142  * Arguments:   @txport *txg@ = pointer to transport context
 143  *              @const void *p@ = pointer to buffer
 144  *              @size_t sz@ = size of the buffer
 145  *
 146  * Returns:     Number of bytes written, or @-1@ on error.
 147  *
 148  * Use:         Writes data to a transport.
 149  */
 150
 151 ssize_t txsock_write(txport *txg, const void *p, size_t sz)
 152 {
 153   txsock *tx = (txsock *)txg;
 154
 155   return (write(tx->fd, p, sz));
 156 }
 157
 158 /* --- @txsock_fetch@ --- *
 159  *
 160  * Arguments:   @void *txv@ = pointer to transport context
 161  *
 162  * Returns:     Nothing of interest.
 163  *
 164  * Use:         Thread to fetch data from a socket.
 165  */
 166
 167 void *txsock_fetch(void *txv)
 168 {
 169   txsock *tx = txv;
 170   unsigned char buf[BUFSIZ];
 171   ssize_t n;
 172   int e;
 173
 174   /* --- Read data while it arrives --- */
 175
 176   for (;;) {
 177     n = read(tx->fd, buf, sizeof(buf));
 178     if (n < 0) {
 179       err_report(ERR_TXPORT, ERRTX_READ, errno,
 180                  "error reading from socket: %s", strerror(errno));
 181       break;
 182     }
 183     if (!n)
 184       break;
 185     if ((e = pthread_mutex_lock(&tx->tx.mx)) != 0) {
 186       err_report(ERR_TXPORT, ERRTX_READ, e,
 187                  "error locking mutex: %s", strerror(e));
 188       break;
 189     }
 190     DA_ENSURE(&tx->tx.buf, n);
 191     memcpy(DA(&tx->tx.buf) + DA_LEN(&tx->tx.buf), buf, n);
 192     DA_EXTEND(&tx->tx.buf, n);
 193     pthread_cond_signal(&tx->tx.cv);
 194     pthread_mutex_unlock(&tx->tx.mx);
 195   }
 196
 197   /* --- Deal with crapness --- */
 198
 199   e = pthread_mutex_lock(&tx->tx.mx);
 200   tx->tx.s = TX_CLOSE;
 201   pthread_cond_signal(&tx->tx.cv);
 202   pthread_mutex_unlock(&tx->tx.mx);
 203   return (0);
 204 }
 205
 206 /* --- @txsock_destroy@ --- *
 207  *
 208  * Arguments:   @txport *txg@ = pointer to transport context
 209  *
 210  * Returns:     ---
 211  *
 212  * Use:         Destroys a socket transport.
 213  */
 214
 215 void txsock_destroy(txport *txg)
 216 {
 217   txsock *tx = (txsock *)txg;
 218
 219   close(tx->fd);
 220   DESTROY(tx);
 221 }
 222
 223 /*----- That's all, folks -------------------------------------------------*/