client.c

   1 /*
   2  * Copyright (C) 1997-2011 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file client.c the client program used to connect to para_server */
   8
   9 #include <regex.h>
  10 #include <stdbool.h>
  11
  12 #include "para.h"
  13 #include "list.h"
  14 #include "sched.h"
  15 #include "crypt.h"
  16 #include "client.cmdline.h"
  17 #include "string.h"
  18 #include "stdin.h"
  19 #include "stdout.h"
  20 #include "client.h"
  21 #include "buffer_tree.h"
  22 #include "error.h"
  23
  24 INIT_CLIENT_ERRLISTS;
  25
  26 static struct sched sched;
  27 static struct client_task *ct;
  28 static struct stdin_task sit;
  29 static struct stdout_task sot;
  30
  31 static void supervisor_post_select(struct sched *s, struct task *t)
  32 {
  33         if (ct->task.error < 0) {
  34                 t->error = ct->task.error;
  35                 return;
  36         }
  37         if (ct->status == CL_SENDING) {
  38                 stdin_set_defaults(&sit);
  39                 register_task(s, &sit.task);
  40                 t->error = -E_TASK_STARTED;
  41                 return;
  42         }
  43         if (ct->status == CL_RECEIVING) {
  44                 stdout_set_defaults(&sot);
  45                 register_task(s, &sot.task);
  46                 t->error = -E_TASK_STARTED;
  47                 return;
  48         }
  49 }
  50
  51 static struct task svt = {
  52         .post_select = supervisor_post_select,
  53         .status = "supervisor task"
  54 };
  55
  56 static int client_loglevel = LL_ERROR; /* loglevel */
  57 INIT_STDERR_LOGGING(client_loglevel);
  58
  59 /**
  60  * The client program to connect to para_server.
  61  *
  62  * \param argc Usual argument count.
  63  * \param argv Usual argument vector.
  64  *
  65  * It registers two tasks: The client task that communicates with para_server
  66  * and the supervisor task that minitors whether the client task intends to
  67  * read from stdin or write to stdout.
  68  *
  69  * Once it has been determined whether the client command corresponds to a
  70  * stdin command (addmood, addimg, ..), either the stdin task or the stdout
  71  * task is set up to replace the supervisor task.
  72  *
  73  * \return EXIT_SUCCESS or EXIT_FAILURE
  74  *
  75  * \sa client_open(), stdin.c, stdout.c, para_client(1), para_server(1)
  76  */
  77 int main(int argc, char *argv[])
  78 {
  79
  80         int ret;
  81         static struct sched s;
  82
  83         init_random_seed_or_die();
  84         s.default_timeout.tv_sec = 1;
  85         s.default_timeout.tv_usec = 0;
  86
  87         /*
  88          * We add buffer tree nodes for stdin and stdout even though
  89          * only one of them will be needed. This simplifies the code
  90          * a bit wrt. to the buffer tree setup.
  91          */
  92         sit.btrn = btr_new_node(&(struct btr_node_description)
  93                 EMBRACE(.name = "stdin"));
  94         ret = client_open(argc, argv, &ct, &client_loglevel, sit.btrn, NULL, &sched);
  95         if (ret < 0)
  96                 goto out;
  97         sot.btrn = btr_new_node(&(struct btr_node_description)
  98                 EMBRACE(.name = "stdout", .parent = ct->btrn));
  99         register_task(&sched, &svt);
 100         ret = schedule(&sched);
 101 out:
 102         client_close(ct);
 103         btr_free_node(sit.btrn);
 104         btr_free_node(sot.btrn);
 105         if (ret < 0) {
 106                 /* can not use PARA_LOG here because ct is NULL */
 107                 fprintf(stderr, "%s\n", para_strerror(-ret));
 108                 return EXIT_FAILURE;
 109         }
 110         return EXIT_SUCCESS;
 111 }