/* -*-c-*-
*
- * $Id: fdflags.c,v 1.2 2004/04/08 01:36:11 mdw Exp $
+ * $Id$
*
* Manipulates flags on file descriptors
*
* (c) 1999 Straylight/Edgeware
*/
-/*----- Licensing notice --------------------------------------------------*
+/*----- Licensing notice --------------------------------------------------*
*
* This file is part of the mLib utilities library.
*
* 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,
int fdflags(int fd, unsigned fbic, unsigned fxor,
unsigned fdbic, unsigned fdxor)
{
- int f;
+ int f, ff;
- if ((f = fcntl(fd, F_GETFL)) == -1 ||
- fcntl(fd, F_SETFL, (f & ~fbic) ^ fxor) == -1 ||
- (f = fcntl(fd, F_GETFD)) == -1 ||
- fcntl(fd, F_SETFD, (f & ~fdbic) ^ fdxor) == -1)
- return (-1);
+ 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);
}