kernel/include/pipe.h

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2009  Martin 'povik' Poviser (martin.povik@gmail.com)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifndef _PIPE_H
  20 #define _PIPE_H
  21
  22 #include <mytypes.h>
  23
  24 #define PIPE_BUFFER_PART_SIZE 128
  25
  26 #define FD_PIPE 0x200
  27
  28 typedef struct pipe_buffer {
  29         BYTE buffer[PIPE_BUFFER_PART_SIZE];
  30         struct pipe_buffer *next, *prev;
  31 } pipe_buffer_t;
  32
  33 typedef struct pipe {
  34         pipe_buffer_t *buffer_list_start;
  35         pipe_buffer_t *buffer_list_end;
  36         unsigned int buffer_start_pos;
  37         unsigned int buffer_end_len;
  38         int fd_a, fd_b;
  39         struct pipe *next, *prev;
  40 } pipe_t;
  41
  42 pipe_t *pipe_get (int fd);
  43 void pipe_close (int fd);
  44 bool pipe_write (pipe_t *p, BYTE *buffer, unsigned int buffer_len);
  45 unsigned int pipe_read (pipe_t *p, BYTE *buffer, unsigned int buffer_max_len);
  46 int pipe (int fds[2]);
  47
  48 #endif