recv.c

   1 /*
   2  * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18 #include "para.h"
  19
  20 #include "recv.h"
  21 #include "recv.cmdline.h"
  22 #include "error.h"
  23
  24 struct gengetopt_args_info conf;
  25
  26 INIT_RECV_ERRLISTS;
  27
  28 __printf_2_3 void para_log(int ll, char* fmt,...)
  29 {
  30         va_list argp;
  31
  32         /* ignore log message if loglevel is not high enough */
  33         if (ll < conf.loglevel_arg)
  34                 return;
  35         va_start(argp, fmt);
  36         vfprintf(stderr, fmt, argp);
  37         va_end(argp);
  38 }
  39
  40 static void *parse_config(int argc, char *argv[], int *receiver_num)
  41 {
  42         int i;
  43
  44         if (cmdline_parser(argc, argv, &conf))
  45                 return NULL;
  46         if (conf.list_receivers_given) {
  47                 printf("available receivers: ");
  48                 for (i = 0; receivers[i].name; i++)
  49                         printf("%s%s", i? " " : "", receivers[i].name);
  50                 printf("\nTry\n\tpara_recv -r '<receivername> -h'\n"
  51                         "for help on <receivername>.\n");
  52                 exit(EXIT_SUCCESS);
  53         }
  54         return check_receiver_arg(conf.receiver_arg, receiver_num);
  55 }
  56
  57 int main(int argc, char *argv[])
  58 {
  59         int ret, eof = 0, max, r_opened = 0, receiver_num;
  60         struct timeval timeout;
  61         struct  receiver *r = NULL;
  62         fd_set rfds, wfds;
  63         struct receiver_node rn;
  64
  65         memset(&rn, 0, sizeof(struct receiver_node));
  66         for (ret = 0; receivers[ret].name; ret++)
  67                 receivers[ret].init(&receivers[ret]);
  68         ret = -E_RECV_SYNTAX;
  69         rn.conf = parse_config(argc, argv, &receiver_num);
  70         if (!rn.conf) {
  71                 PARA_EMERG_LOG("%s", "parse failed\n");
  72                 goto out;
  73         }
  74         r = &receivers[receiver_num];
  75         rn.receiver = r;
  76         ret = r->open(&rn);
  77         if (ret < 0)
  78                 goto out;
  79         r_opened = 1;
  80 recv:
  81         FD_ZERO(&rfds);
  82         FD_ZERO(&wfds);
  83         timeout.tv_sec = 0;
  84         timeout.tv_usec = 1000 * 1000;
  85         max = -1;
  86         ret = r->pre_select(&rn, &rfds, &wfds, &timeout);
  87         max = MAX(max, ret);
  88
  89         PARA_DEBUG_LOG("timeout: %lums\n", tv2ms(&timeout));
  90         ret = select(max + 1, &rfds, &wfds, NULL, &timeout);
  91         if (ret < 0) {
  92                 if (errno == EINTR || errno == EAGAIN)
  93                         goto recv;
  94                 ret = -E_RECV_SELECT;
  95                 goto out;
  96         }
  97         ret = r->post_select(&rn, ret, &rfds, &wfds);
  98         if (ret < 0)
  99                 goto out;
 100         if (!ret)
 101                 eof = 1;
 102         if (!rn.loaded) {
 103                 if (eof)
 104                         goto out;
 105                 goto recv;
 106         }
 107         ret = write(STDOUT_FILENO, rn.buf, rn.loaded);
 108         PARA_DEBUG_LOG("wrote %d/%zd\n", ret, rn.loaded);
 109         if (ret < 0) {
 110                 ret = -E_WRITE_STDOUT;
 111                 goto out;
 112         }
 113         if (ret != rn.loaded) {
 114                 PARA_INFO_LOG("short write %d/%zd\n", ret, rn.loaded);
 115                 memmove(rn.buf, rn.buf + ret, rn.loaded - ret);
 116         }
 117         rn.loaded -= ret;
 118         if (rn.loaded || !eof)
 119                 goto recv;
 120 out:
 121         if (r_opened)
 122                 r->close(&rn);
 123         if (r)
 124                 r->shutdown();
 125         if (ret < 0)
 126                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 127         return ret;
 128 }