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 client_task *ct;
  27 static struct stdin_task sit;
  28 static struct stdout_task sot;
  29
  30 static void supervisor_post_select(__a_unused struct sched *s, struct task *t)
  31 {
  32         if (ct->task.error < 0) {
  33                 t->error = ct->task.error;
  34                 return;
  35         }
  36         if (ct->status == CL_SENDING) {
  37                 stdin_set_defaults(&sit);
  38                 register_task(&sit.task);
  39                 t->error = -E_TASK_STARTED;
  40                 return;
  41         }
  42         if (ct->status == CL_RECEIVING) {
  43                 stdout_set_defaults(&sot);
  44                 register_task(&sot.task);
  45                 t->error = -E_TASK_STARTED;
  46                 return;
  47         }
  48 }
  49
  50 static struct task svt = {
  51         .post_select = supervisor_post_select,
  52         .status = "supervisor task"
  53 };
  54
  55 static int client_loglevel = LL_ERROR; /* loglevel */
  56 INIT_STDERR_LOGGING(client_loglevel);
  57
  58 /**
  59  * The client program to connect to para_server.
  60  *
  61  * \param argc Usual argument count.
  62  * \param argv Usual argument vector.
  63  *
  64  * It registers two tasks: The client task that communicates with para_server
  65  * and the supervisor task that minitors whether the client task intends to
  66  * read from stdin or write to stdout.
  67  *
  68  * Once it has been determined whether the client command corresponds to a
  69  * stdin command (addmood, addimg, ..), either the stdin task or the stdout
  70  * task is set up to replace the supervisor task.
  71  *
  72  * \return EXIT_SUCCESS or EXIT_FAILURE
  73  *
  74  * \sa client_open(), stdin.c, stdout.c, para_client(1), para_server(1)
  75  */
  76 int main(int argc, char *argv[])
  77 {
  78
  79         int ret;
  80         static struct sched s;
  81
  82         init_random_seed_or_die();
  83         s.default_timeout.tv_sec = 1;
  84         s.default_timeout.tv_usec = 0;
  85         /*
  86          * We add buffer tree nodes for stdin and stdout even though
  87          * only one of them will be needed. This simplifies the code
  88          * a bit wrt. to the buffer tree setup.
  89          */
  90         sit.btrn = btr_new_node(&(struct btr_node_description)
  91                 EMBRACE(.name = "stdin"));
  92         ret = client_open(argc, argv, &ct, &client_loglevel, sit.btrn, NULL);
  93         if (ret < 0)
  94                 goto out;
  95         sot.btrn = btr_new_node(&(struct btr_node_description)
  96                 EMBRACE(.name = "stdout", .parent = ct->btrn));
  97         register_task(&svt);
  98         ret = schedule(&s);
  99 out:
 100         client_close(ct);
 101         btr_free_node(sit.btrn);
 102         btr_free_node(sot.btrn);
 103         if (ret < 0) {
 104                 /* can not use PARA_LOG here because ct is NULL */
 105                 fprintf(stderr, "%s\n", para_strerror(-ret));
 106                 return EXIT_FAILURE;
 107         }
 108         return EXIT_SUCCESS;
 109 }