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 para_recv -r<receivername>:-h for help on <receivername>\n");
  51                 exit(EXIT_SUCCESS);
  52         }
  53         return check_receiver_arg(conf.receiver_arg, receiver_num);
  54 }
  55
  56 int main(int argc, char *argv[])
  57 {
  58         int ret, eof = 0, max, r_opened = 0, receiver_num;
  59         struct timeval timeout;
  60         struct  receiver *r = NULL;
  61         fd_set rfds, wfds;
  62         struct receiver_node rn;
  63
  64         memset(&rn, 0, sizeof(struct receiver_node));
  65         for (ret = 0; receivers[ret].name; ret++)
  66                 receivers[ret].init(&receivers[ret]);
  67         ret = -E_RECV_SYNTAX;
  68         rn.conf = parse_config(argc, argv, &receiver_num);
  69         if (!rn.conf) {
  70                 PARA_EMERG_LOG("%s", "parse failed\n");
  71                 goto out;
  72         }
  73         r = &receivers[receiver_num];
  74         rn.receiver = r;
  75         ret = r->open(&rn);
  76         if (ret < 0)
  77                 goto out;
  78         r_opened = 1;
  79 recv:
  80         FD_ZERO(&rfds);
  81         FD_ZERO(&wfds);
  82         timeout.tv_sec = 0;
  83         timeout.tv_usec = 1000 * 1000;
  84         max = -1;
  85         ret = r->pre_select(&rn, &rfds, &wfds, &timeout);
  86         max = MAX(max, ret);
  87
  88         PARA_DEBUG_LOG("timeout: %lums\n", tv2ms(&timeout));
  89         ret = select(max + 1, &rfds, &wfds, NULL, &timeout);
  90         if (ret < 0) {
  91                 if (errno == EINTR || errno == EAGAIN)
  92                         goto recv;
  93                 ret = -E_RECV_SELECT;
  94                 goto out;
  95         }
  96         ret = r->post_select(&rn, ret, &rfds, &wfds);
  97         if (ret < 0)
  98                 goto out;
  99         if (!ret)
 100                 eof = 1;
 101         if (!rn.loaded) {
 102                 if (eof)
 103                         goto out;
 104                 goto recv;
 105         }
 106         ret = write(STDOUT_FILENO, rn.buf, rn.loaded);
 107         PARA_DEBUG_LOG("wrote %d/%zd\n", ret, rn.loaded);
 108         if (ret < 0) {
 109                 ret = -E_WRITE_STDOUT;
 110                 goto out;
 111         }
 112         if (ret != rn.loaded) {
 113                 PARA_INFO_LOG("short write %d/%zd\n", ret, rn.loaded);
 114                 memmove(rn.buf, rn.buf + ret, rn.loaded - ret);
 115         }
 116         rn.loaded -= ret;
 117         if (rn.loaded || !eof)
 118                 goto recv;
 119 out:
 120         if (r_opened)
 121                 r->close(&rn);
 122         if (r)
 123                 r->shutdown();
 124         if (ret < 0)
 125                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 126         return ret;
 127 }