[mLib] / fdflags.c

/* -*-c-*-
 *
 * $Id$
 *
 * Manipulates flags on file descriptors
 *
 * (c) 1999 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of the mLib utilities library.
 *
 * mLib is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 * 
 * mLib 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 Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with mLib; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

/*----- Header files ------------------------------------------------------*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <fcntl.h>

#include "fdflags.h"

/*----- Main code ---------------------------------------------------------*/

/* --- @fdflags@ --- *
 *
 * Arguments:	@int fd@ = file descriptor to fiddle with
 *		@unsigned fbic, fxor@ = file flags to set and clear
 *		@unsigned fdbic, fdxor@ = descriptor flags to set and clear
 *
 * Returns:	Zero if successful, @-1@ if not.
 *
 * Use:		Sets file descriptor flags in what is, I hope, an obvious
 *		way.
 */

int fdflags(int fd, unsigned fbic, unsigned fxor,
	    unsigned fdbic, unsigned fdxor)
{
  int f, ff;

  if (fbic || fxor) {
    if ((f = fcntl(fd, F_GETFL)) == -1)
      return (-1);
    ff = (f & ~fbic) ^ fxor;
    if (f != ff && fcntl(fd, F_SETFL, ff) == -1)
      return (-1);
  }
  if (fdbic || fdxor) {
    if ((f = fcntl(fd, F_GETFD)) == -1)
      return (-1);
    ff = (f & ~fdbic) ^ fdxor;
    if (f != ff && fcntl(fd, F_SETFD, ff) == -1)
      return (-1);
  }
  return (0);
}

/*----- That's all, folks -------------------------------------------------*/
Commit	Line	Data
aab9ab9f	1	/* --c--
aab9ab9f	2	*
17119f58	3	* $Id$
aab9ab9f	4	*
	5	* Manipulates flags on file descriptors
	6	*
	7	* (c) 1999 Straylight/Edgeware
	8	*/
	9
	10	/----- Licensing notice --------------------------------------------------
	11	*
	12	* This file is part of the mLib utilities library.
	13	*
	14	* mLib is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU Library General Public License as
	16	* published by the Free Software Foundation; either version 2 of the
	17	* License, or (at your option) any later version.
	18	*
	19	* mLib is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU Library General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU Library General Public
	25	* License along with mLib; if not, write to the Free
	26	* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
	27	* MA 02111-1307, USA.
	28	*/
	29
aab9ab9f	30	/----- Header files ------------------------------------------------------/
	31
	32	#include <stdio.h>
	33	#include <stdlib.h>
	34	#include <string.h>
	35
	36	#include <fcntl.h>
	37
	38	#include "fdflags.h"
	39
	40	/----- Main code ---------------------------------------------------------/
	41
	42	/* --- @fdflags@ --- *
	43	*
	44	* Arguments: @int fd@ = file descriptor to fiddle with
	45	* @unsigned fbic, fxor@ = file flags to set and clear
	46	* @unsigned fdbic, fdxor@ = descriptor flags to set and clear
	47	*
	48	* Returns: Zero if successful, @-1@ if not.
	49	*
	50	* Use: Sets file descriptor flags in what is, I hope, an obvious
	51	* way.
	52	*/
	53
	54	int fdflags(int fd, unsigned fbic, unsigned fxor,
	55	unsigned fdbic, unsigned fdxor)
	56	{
17119f58	57	int f, ff;
aab9ab9f	58
17119f58	59	if (fbic \|\| fxor) {
	60	if ((f = fcntl(fd, F_GETFL)) == -1)
	61	return (-1);
36b6fecc	62	ff = (f & ~fbic) ^ fxor;
17119f58	63	if (f != ff && fcntl(fd, F_SETFL, ff) == -1)
	64	return (-1);
	65	}
	66	if (fdbic \|\| fdxor) {
	67	if ((f = fcntl(fd, F_GETFD)) == -1)
	68	return (-1);
36b6fecc	69	ff = (f & ~fdbic) ^ fdxor;
17119f58	70	if (f != ff && fcntl(fd, F_SETFD, ff) == -1)
	71	return (-1);
	72	}
aab9ab9f	73	return (0);
	74	}
	75
	76	/----- That's all, folks -------------------------------------------------/