mirror of
git://source.winehq.org/git/wine.git
synced 2024-09-06 04:00:56 +00:00
193 lines
5.4 KiB
C
193 lines
5.4 KiB
C
/*
|
|
* Server main select() loop
|
|
*
|
|
* Copyright (C) 1998 Alexandre Julliard
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
#include "server/object.h"
|
|
|
|
/* select user fd */
|
|
struct user
|
|
{
|
|
struct timeval when; /* timeout expiry (absolute time) */
|
|
struct user *next; /* next in sorted timeout list */
|
|
struct user *prev; /* prev in sorted timeout list */
|
|
const struct select_ops *ops; /* user operations list */
|
|
int fd; /* user fd */
|
|
void *private; /* user private data */
|
|
};
|
|
|
|
static struct user *users[FD_SETSIZE]; /* users array */
|
|
static fd_set read_set, write_set; /* current select sets */
|
|
static int nb_users; /* current number of users */
|
|
static int max_fd; /* max fd in use */
|
|
static struct user *timeout_head; /* sorted timeouts list head */
|
|
static struct user *timeout_tail; /* sorted timeouts list tail */
|
|
|
|
|
|
/* add a user */
|
|
int add_select_user( int fd, int events, const struct select_ops *ops, void *private )
|
|
{
|
|
int flags;
|
|
struct user *user = malloc( sizeof(*user) );
|
|
if (!user) return -1;
|
|
assert( !users[fd] );
|
|
|
|
user->ops = ops;
|
|
user->when.tv_sec = 0;
|
|
user->when.tv_usec = 0;
|
|
user->fd = fd;
|
|
user->private = private;
|
|
|
|
flags = fcntl( fd, F_GETFL, 0 );
|
|
fcntl( fd, F_SETFL, flags | O_NONBLOCK );
|
|
|
|
users[fd] = user;
|
|
set_select_events( fd, events );
|
|
if (fd > max_fd) max_fd = fd;
|
|
nb_users++;
|
|
return fd;
|
|
}
|
|
|
|
/* remove a user */
|
|
void remove_select_user( int fd )
|
|
{
|
|
struct user *user = users[fd];
|
|
assert( user );
|
|
|
|
set_select_timeout( fd, 0 );
|
|
set_select_events( fd, 0 );
|
|
users[fd] = NULL;
|
|
if (max_fd == fd) while (max_fd && !users[max_fd]) max_fd--;
|
|
nb_users--;
|
|
free( user );
|
|
}
|
|
|
|
/* set a user timeout */
|
|
void set_select_timeout( int fd, struct timeval *when )
|
|
{
|
|
struct user *user = users[fd];
|
|
struct user *pos;
|
|
assert( user );
|
|
|
|
if (user->when.tv_sec || user->when.tv_usec)
|
|
{
|
|
/* there is already a timeout */
|
|
if (user->next) user->next->prev = user->prev;
|
|
else timeout_tail = user->prev;
|
|
if (user->prev) user->prev->next = user->next;
|
|
else timeout_head = user->next;
|
|
user->when.tv_sec = user->when.tv_usec = 0;
|
|
}
|
|
if (!when) return; /* no timeout */
|
|
user->when = *when;
|
|
|
|
/* Now insert it in the linked list */
|
|
|
|
for (pos = timeout_head; pos; pos = pos->next)
|
|
{
|
|
if (pos->when.tv_sec > user->when.tv_sec) break;
|
|
if ((pos->when.tv_sec == user->when.tv_sec) &&
|
|
(pos->when.tv_usec > user->when.tv_usec)) break;
|
|
}
|
|
|
|
if (pos) /* insert it before 'pos' */
|
|
{
|
|
if ((user->prev = pos->prev)) user->prev->next = user;
|
|
else timeout_head = user;
|
|
user->next = pos;
|
|
pos->prev = user;
|
|
}
|
|
else /* insert it at the tail */
|
|
{
|
|
user->next = NULL;
|
|
if (timeout_tail) timeout_tail->next = user;
|
|
else timeout_head = user;
|
|
user->prev = timeout_tail;
|
|
timeout_tail = user;
|
|
}
|
|
}
|
|
|
|
/* set the events that select waits for on this fd */
|
|
void set_select_events( int fd, int events )
|
|
{
|
|
if (events & READ_EVENT) FD_SET( fd, &read_set );
|
|
else FD_CLR( fd, &read_set );
|
|
if (events & WRITE_EVENT) FD_SET( fd, &write_set );
|
|
else FD_CLR( fd, &write_set );
|
|
}
|
|
|
|
/* get a user private data, checking the type */
|
|
void *get_select_private_data( const struct select_ops *ops, int fd )
|
|
{
|
|
struct user *user = users[fd];
|
|
assert( user );
|
|
assert( user->ops == ops );
|
|
return user->private;
|
|
}
|
|
|
|
/* server main loop */
|
|
void select_loop(void)
|
|
{
|
|
int i, ret;
|
|
|
|
setsid();
|
|
signal( SIGPIPE, SIG_IGN );
|
|
|
|
while (nb_users)
|
|
{
|
|
fd_set read = read_set, write = write_set;
|
|
#if 0
|
|
printf( "select: " );
|
|
for (i = 0; i <= max_fd; i++) printf( "%c", FD_ISSET( i, &read_set ) ? 'r' :
|
|
(FD_ISSET( i, &write_set ) ? 'w' : '-') );
|
|
printf( "\n" );
|
|
#endif
|
|
if (timeout_head)
|
|
{
|
|
struct timeval tv, now;
|
|
gettimeofday( &now, NULL );
|
|
if ((timeout_head->when.tv_sec < now.tv_sec) ||
|
|
((timeout_head->when.tv_sec == now.tv_sec) &&
|
|
(timeout_head->when.tv_usec < now.tv_usec)))
|
|
{
|
|
timeout_head->ops->timeout( timeout_head->fd, timeout_head->private );
|
|
continue;
|
|
}
|
|
tv.tv_sec = timeout_head->when.tv_sec - now.tv_sec;
|
|
if ((tv.tv_usec = timeout_head->when.tv_usec - now.tv_usec) < 0)
|
|
{
|
|
tv.tv_usec += 1000000;
|
|
tv.tv_sec--;
|
|
}
|
|
ret = select( max_fd + 1, &read, &write, NULL, &tv );
|
|
}
|
|
else /* no timeout */
|
|
{
|
|
ret = select( max_fd + 1, &read, &write, NULL, NULL );
|
|
}
|
|
|
|
if (!ret) continue;
|
|
if (ret == -1) perror("select");
|
|
|
|
for (i = 0; i <= max_fd; i++)
|
|
{
|
|
int event = 0;
|
|
if (FD_ISSET( i, &write )) event |= WRITE_EVENT;
|
|
if (FD_ISSET( i, &read )) event |= READ_EVENT;
|
|
if (event) users[i]->ops->event( i, event, users[i]->private );
|
|
}
|
|
}
|
|
}
|