include/haproxy/pipe.h

/*
 * include/haproxy/pipe.h
 * Pipe management - exported functions
 *
 * Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation, version 2.1
 * exclusively.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef _HAPROXY_PIPE_H
#define _HAPROXY_PIPE_H

#include <haproxy/api.h>
#include <haproxy/pipe-t.h>

extern int pipes_used;	/* # of pipes in use (2 fds each) */
extern int pipes_free;	/* # of pipes unused (2 fds each) */

/* return a pre-allocated empty pipe. Try to allocate one if there isn't any
 * left. NULL is returned if a pipe could not be allocated.
 */
struct pipe *get_pipe();

/* destroy a pipe, possibly because an error was encountered on it. Its FDs
 * will be closed and it will not be reinjected into the live pool.
 */
void kill_pipe(struct pipe *p);

/* put back a unused pipe into the live pool. If it still has data in it, it is
 * closed and not reinjected into the live pool. The caller is not allowed to
 * use it once released.
 */
void put_pipe(struct pipe *p);

#endif /* _HAPROXY_PIPE_H */

/*
 * Local variables:
 *  c-indent-level: 8
 *  c-basic-offset: 8
 * End:
 */