lib/isapipe.h

/* Test whether a file descriptor is a pipe.

   Copyright (C) 2006-2026 Free Software Foundation, Inc.

   This file 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, either version 3 of the
   License, or (at your option) any later version.

   This file 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 program.  If not, see <https://www.gnu.org/licenses/>.  */

/* This file uses HAVE_FIFO_PIPES.  */
#if !_GL_CONFIG_H_INCLUDED
 #error "Please include config.h first."
#endif

#ifdef __cplusplus
extern "C" {
#endif


/* Whether pipes are FIFOs; -1 if not known.  */
#ifndef HAVE_FIFO_PIPES
# define HAVE_FIFO_PIPES (-1)
#endif

int isapipe (int fd);


#ifdef __cplusplus
}
#endif