pipevar.h

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/*
** pipevar.h for lseos in lseos-srv/basic/pipe
** 
** Copyright(c)2004 Vianney Rancurel
** Login   <vianney@epita.fr>
** 
** Started on  Tue Feb 17 17:14:41 2004 Vianney Rancurel
** Last update Mon Dec  6 12:24:55 2004 Vianney Rancurel
*/
#ifndef __PIPEVAR_H__
#define __PIPEVAR_H__   1
#include <libc.h>

typedef enum
  {
    PIPE_STILL_AVAIL = 100,
    PIPE_BAD_TYPE,
    PIPE_ALREADY_CLOSED,
    PIPE_TOO_MANY_HOLDERS,
    PIPE_HOLDER_DOESNT_EXIST,
    PIPE_BAD_PATH_SPEC,
  } t_pipe_suberrno_codes;

typedef struct          s_pipestat
{
  int                   cumulated;
  int                   nwrites;
  int                   nreads;
}                       t_pipestat;

typedef struct          s_pipe
{
  u_int32_t             avail:1;
  u_int32_t             closed:1;

#define MAXHOLDER       10
  pid_t                 holders[MAXHOLDER];
  uid_t                 uid;

  int                   type;
#define PIPE_CONSUMER   1
#define PIPE_PRODUCER   2

  int                   party;

  char                  *buf; /* by convention, buffer used is in 
                                 the consumer */
  int                   pos;

  u_int32_t             cond;

  t_pipestat            stats;
}                       t_pipe;

typedef struct          s_pipe_info
{
  pid_t                 notify_pid;

  __cpu_simple_lock_t   lock;
}                       t_pipe_info;

#endif

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