client.c

   1 /*
   2  * Copyright (C) 1997-2008 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 "para.h"
  10 #include "list.h"
  11 #include "sched.h"
  12 #include "client.cmdline.h"
  13 #include "string.h"
  14 #include "stdin.h"
  15 #include "stdout.h"
  16 #include "client.h"
  17 #include "error.h"
  18
  19 INIT_CLIENT_ERRLISTS;
  20
  21 static struct client_task *ct;
  22 static struct stdin_task sit;
  23 static struct stdout_task sot;
  24
  25 static void supervisor_pre_select(struct sched *s, struct task *t)
  26 {
  27         if (ct->task.error < 0) {
  28                 t->error = ct->task.error;
  29                 return;
  30         }
  31         if (ct->status == CL_SENDING) {
  32                 stdin_set_defaults(&sit);
  33                 sit.buf = para_malloc(sit.bufsize),
  34                 register_task(&sit.task);
  35                 ct->inbuf = sit.buf;
  36                 ct->in_loaded = &sit.loaded;
  37                 ct->in_error = &sit.task.error;
  38                 t->error = -E_TASK_STARTED;
  39                 goto min_delay;
  40         }
  41         if (ct->status == CL_RECEIVING) {
  42                 stdout_set_defaults(&sot);
  43                 sot.buf = ct->buf;
  44                 sot.loaded = &ct->loaded;
  45                 sot.input_error = &ct->task.error;
  46                 register_task(&sot.task);
  47                 t->error = -E_TASK_STARTED;
  48                 goto min_delay;
  49         }
  50         return;
  51 min_delay:
  52         s->timeout.tv_sec = 0;
  53         s->timeout.tv_usec = 1;
  54 }
  55
  56 static struct task svt = {
  57         .pre_select = supervisor_pre_select,
  58         .status = "supervisor task"
  59 };
  60
  61 INIT_STDERR_LOGGING(ct->conf.loglevel_arg);
  62
  63
  64 /**
  65  * The client program to connect to para_server.
  66  *
  67  * \param argc Usual argument count.
  68  * \param argv Usual argument vector.
  69  *
  70  * It registers two tasks: The client task that communicates with para_server
  71  * and the standard out task that writes any output produced by the client task
  72  * to standard out.
  73  *
  74  * \return EXIT_SUCCESS or EXIT_FAILURE
  75  *
  76  * \sa client_open(), stdout.c, stdout.h, para_client(1), para_server(1)
  77  */
  78 int main(int argc, char *argv[])
  79 {
  80
  81         int ret;
  82         struct sched s;
  83
  84         s.default_timeout.tv_sec = 1;
  85         s.default_timeout.tv_usec = 0;
  86         ret = client_open(argc, argv, &ct);
  87         if (ret < 0) /* can not use PARA_LOG here */
  88                 exit(EXIT_FAILURE);
  89         register_task(&svt);
  90         ret = schedule(&s);
  91         if (ret < 0)
  92                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
  93         client_close(ct);
  94         return ret >= 0? EXIT_SUCCESS: EXIT_FAILURE;
  95 }