cinelerra-5.0/cinelerra/threadfork.C

   1
   2 /*
   3  * CINELERRA
   4  * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #include "threadfork.h"
  23
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <sys/types.h>
  27 #include <sys/wait.h>
  28 #include <unistd.h>
  29
  30 #define MAX_ARGS 32
  31
  32
  33
  34
  35 ThreadFork::ThreadFork()
  36 {
  37         pid = 0;
  38         tid = 0;
  39         pthread_mutexattr_t attr;
  40         pthread_mutexattr_init(&attr);
  41         pthread_mutex_init(&start_lock, &attr);
  42
  43
  44
  45         arguments = new char*[MAX_ARGS];
  46         total_arguments = 0;
  47         stdin_fd = 0;
  48         pipe_stdin = 0;
  49         command_line = "";
  50 }
  51
  52 ThreadFork::~ThreadFork()
  53 {
  54 //      if(pipe_stdin)
  55 //      {
  56                 pclose(stdin_fd);
  57 //              if(stdin_fd) fclose(stdin_fd);
  58 //              close(filedes[0]);
  59 //              close(filedes[1]);
  60 //      }
  61
  62 //      pthread_join(tid, 0);
  63
  64         for(int i = 0; i < total_arguments; i++)
  65                 delete [] arguments[i];
  66
  67         pthread_mutex_destroy(&start_lock);
  68         delete [] arguments;
  69 }
  70
  71 void* ThreadFork::entrypoint(void *ptr)
  72 {
  73         ThreadFork *threadfork = (ThreadFork*)ptr;
  74         threadfork->run();
  75         return 0;
  76 }
  77
  78 void ThreadFork::start_command(const char *command_line, int pipe_stdin)
  79 {
  80         this->command_line = command_line;
  81         this->pipe_stdin = pipe_stdin;
  82
  83         pthread_attr_t  attr;
  84         pthread_attr_init(&attr);
  85
  86
  87         stdin_fd = popen(command_line, "w");
  88
  89 //      pthread_mutex_lock(&start_lock);
  90
  91
  92 //      pthread_create(&tid, &attr, entrypoint, this);
  93 //      pthread_mutex_lock(&start_lock);
  94 //      pthread_mutex_unlock(&start_lock);
  95 }
  96
  97
  98 void ThreadFork::run()
  99 {
 100         char *path_ptr;
 101         char *ptr;
 102         char *argument_ptr;
 103         char argument[BCTEXTLEN];
 104         char command_line[BCTEXTLEN];
 105         int new_pid;
 106
 107         strcpy(command_line, this->command_line);
 108
 109
 110
 111 // Set up arguments for exec
 112         ptr = command_line;
 113         path_ptr = path;
 114         while(*ptr != ' ' && *ptr != 0)
 115         {
 116                 *path_ptr++ = *ptr++;
 117         }
 118         *path_ptr = 0;
 119
 120         arguments[total_arguments] = new char[strlen(path) + 1];
 121         strcpy(arguments[total_arguments], path);
 122
 123         total_arguments++;
 124         arguments[total_arguments] = 0;
 125
 126         while(*ptr != 0)
 127         {
 128                 ptr++;
 129                 argument_ptr = argument;
 130                 while(*ptr != ' ' && *ptr != 0)
 131                 {
 132                         *argument_ptr++ = *ptr++;
 133                 }
 134                 *argument_ptr = 0;
 135
 136                 arguments[total_arguments] = new char[strlen(argument) + 1];
 137                 strcpy(arguments[total_arguments], argument);
 138                 total_arguments++;
 139                 arguments[total_arguments] = 0;
 140         }
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151         if(pipe_stdin)
 152         {
 153                 (void)pipe(filedes);
 154                 stdin_fd = fdopen(filedes[1], "w");
 155         }
 156
 157         pthread_mutex_unlock(&start_lock);
 158
 159
 160
 161         new_pid = vfork();
 162
 163 // Redirect stdin
 164         if(new_pid == 0)
 165         {
 166                 if(pipe_stdin) dup2(filedes[0], fileno(stdin));
 167
 168
 169
 170                 execvp(path, arguments);
 171
 172
 173
 174                 perror("execvp");
 175                 _exit(0);
 176         }
 177         else
 178         {
 179                 pid = new_pid;
 180                 pthread_mutex_unlock(&start_lock);
 181
 182                 int return_value;
 183                 if(waitpid(pid, &return_value, WUNTRACED) == -1)
 184                 {
 185                         perror("ThreadFork::run: waitpid");
 186                 }
 187         }
 188
 189
 190 }
 191
 192
 193 FILE* ThreadFork::get_stdin()
 194 {
 195         return stdin_fd;
 196 }