backend.c

/*\
||| This file a part of Pike, and is copyright by Fredrik Hubinette
||| Pike is distributed as GPL (General Public License)
||| See the files COPYING and DISCLAIMER for more information.
\*/
#include "global.h"
RCSID("$Id: backend.c,v 1.8 1997/01/26 22:47:03 per Exp $");
#include "backend.h"
#include <errno.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <sys/param.h>
#include <string.h>
#include "interpret.h"
#include "object.h"
#include "types.h"
#include "error.h"
#include "fd_control.h"
#include "main.h"
#include "callback.h"
#include "threads.h"

#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif

#define SELECT_READ 1
#define SELECT_WRITE 2

struct selectors
{
  fd_set read;
  fd_set write;
};

static struct selectors selectors;

file_callback read_callback[MAX_OPEN_FILEDESCRIPTORS];
void *read_callback_data[MAX_OPEN_FILEDESCRIPTORS];
file_callback write_callback[MAX_OPEN_FILEDESCRIPTORS];
void *write_callback_data[MAX_OPEN_FILEDESCRIPTORS];

static int max_fd;
struct timeval current_time;
struct timeval next_timeout;

static struct callback_list backend_callbacks;

struct callback *add_backend_callback(callback_func call,
				      void *arg,
				      callback_func free_func)
{
  return add_to_callback(&backend_callbacks, call, arg, free_func);
}

void init_backend()
{
  FD_ZERO(&selectors.read);
  FD_ZERO(&selectors.write);
}

void set_read_callback(int fd,file_callback cb,void *data)
{
#ifdef DEBUG
  if(fd<0 || fd>=MAX_OPEN_FILEDESCRIPTORS)
    fatal("File descriptor out of range.\n %d",fd);
#endif

  read_callback[fd]=cb;