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

   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 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: tx-socket.c,v $
  32  * Revision 1.2  2002/01/30 09:25:35  mdw
  33  * Minor modifications for the transport configuration change.
  34  *
  35  * Revision 1.1  2002/01/25 19:34:45  mdw
  36  * Initial revision
  37  *
  38  */
  39
  40 /*----- Header files ------------------------------------------------------*/
  41
  42 #ifdef HAVE_CONFIG_H
  43 #  include "config.h"
  44 #endif
  45
  46 #include <errno.h>
  47 #include <stddef.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51
  52 #include <sys/types.h>
  53 #include <unistd.h>
  54 #include <sys/socket.h>
  55 #include <sys/un.h>
  56 #include <pthread.h>
  57
  58 #include <mLib/alloc.h>
  59 #include <mLib/darray.h>
  60 #include <mLib/sub.h>
  61
  62 #include "err.h"
  63 #include "txport.h"
  64 #include "tx-socket.h"
  65
  66 #undef sun
  67
  68 /*----- Data structures ---------------------------------------------------*/
  69
  70 typedef struct txsock {
  71   txport tx;                            /* Transport base */
  72   int fd;                               /* File descriptor */
  73 } txsock;
  74
  75 /*----- Main code ---------------------------------------------------------*/
  76
  77 /* --- @txsock_create@ --- *
  78  *
  79  * Arguments:   @const char *file@ = filename for socket
  80  *
  81  * Returns:     Pointer to created transport block.
  82  *
  83  * Use:         Creates a socket transport.
  84  */
  85
  86 txport *txsock_create(const char *file)
  87 {
  88   txsock *tx;
  89   int fd;
  90   struct sockaddr_un *sun;
  91   size_t len, sunsz;
  92
  93   /* --- Set up the address block --- */
  94
  95   len = strlen(file) + 1;
  96   sunsz = offsetof(struct sockaddr_un, sun_path) + len;
  97   sun = xmalloc(sunsz);
  98   sun->sun_family = AF_UNIX;
  99   memcpy(sun->sun_path, file, len);
 100
 101   /* --- Create the socket --- */
 102
 103   if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
 104     err_report(ERR_TXPORT, ERRTX_CREATE, errno,
 105                "error creating socket: %s", strerror(errno));
 106     goto fail_0;
 107   }
 108
 109   /* --- Connect --- */
 110
 111   if (connect(fd, (struct sockaddr *)sun, sunsz)) {
 112     err_report(ERR_TXPORT, ERRTX_CREATE, errno,
 113                "couldn't connect to `%s': %s", file, strerror(errno));
 114     goto fail_1;
 115   }
 116
 117   /* --- Done --- */
 118
 119   tx = CREATE(txsock);
 120   tx->fd = fd;
 121   xfree(sun);
 122   return (&tx->tx);
 123
 124   /* --- Tidy up because it all went horribly wrong --- */
 125
 126 fail_1:
 127   close(fd);
 128 fail_0:
 129   xfree(sun);
 130   return (0);
 131 }
 132
 133 /* --- @txsock_write@ --- *
 134  *
 135  * Arguments:   @txport *txg@ = pointer to transport context
 136  *              @const void *p@ = pointer to buffer
 137  *              @size_t sz@ = size of the buffer
 138  *
 139  * Returns:     Number of bytes written, or @-1@ on error.
 140  *
 141  * Use:         Writes data to a transport.
 142  */
 143
 144 ssize_t txsock_write(txport *txg, const void *p, size_t sz)
 145 {
 146   txsock *tx = (txsock *)txg;
 147
 148   return (write(tx->fd, p, sz));
 149 }
 150
 151 /* --- @txsock_fetch@ --- *
 152  *
 153  * Arguments:   @void *txv@ = pointer to transport context
 154  *
 155  * Returns:     Nothing of interest.
 156  *
 157  * Use:         Thread to fetch data from a socket.
 158  */
 159
 160 void *txsock_fetch(void *txv)
 161 {
 162   txsock *tx = txv;
 163   unsigned char buf[BUFSIZ];
 164   ssize_t n;
 165   int e;
 166
 167   /* --- Read data while it arrives --- */
 168
 169   for (;;) {
 170     n = read(tx->fd, buf, sizeof(buf));
 171     if (n < 0) {
 172       err_report(ERR_TXPORT, ERRTX_READ, errno,
 173                  "error reading from socket: %s", strerror(errno));
 174       break;
 175     }
 176     if (!n)
 177       break;
 178     if ((e = pthread_mutex_lock(&tx->tx.mx)) != 0) {
 179       err_report(ERR_TXPORT, ERRTX_READ, e,
 180                  "error locking mutex: %s", strerror(e));
 181       break;
 182     }
 183     DA_ENSURE(&tx->tx.buf, n);
 184     memcpy(DA(&tx->tx.buf) + DA_LEN(&tx->tx.buf), buf, n);
 185     DA_EXTEND(&tx->tx.buf, n);
 186     pthread_cond_signal(&tx->tx.cv);
 187     pthread_mutex_unlock(&tx->tx.mx);
 188   }
 189
 190   /* --- Deal with crapness --- */
 191
 192   e = pthread_mutex_lock(&tx->tx.mx);
 193   tx->tx.s = TX_CLOSE;
 194   pthread_cond_signal(&tx->tx.cv);
 195   pthread_mutex_unlock(&tx->tx.mx);
 196   return (0);
 197 }
 198
 199 /* --- @txsock_destroy@ --- *
 200  *
 201  * Arguments:   @txport *txg@ = pointer to transport context
 202  *
 203  * Returns:     ---
 204  *
 205  * Use:         Destroys a socket transport.
 206  */
 207
 208 void txsock_destroy(txport *txg)
 209 {
 210   txsock *tx = (txsock *)txg;
 211
 212   close(tx->fd);
 213   DESTROY(tx);
 214 }
 215
 216 /*----- That's all, folks -------------------------------------------------*/