Manipulate file descriptor flags.

[mLib] / fdflags.c

diff --git a/fdflags.c b/fdflags.c
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+/* -*-c-*-
+ *
+ * $Id: fdflags.c,v 1.1 1999/07/26 23:16:59 mdw Exp $
+ *
+ * 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.
+ */
+
+/*----- Revision history --------------------------------------------------* 
+ *
+ * $Log: fdflags.c,v $
+ * Revision 1.1  1999/07/26 23:16:59  mdw
+ * Manipulate file descriptor flags.
+ *
+ */
+
+/*----- 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;
+
+  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);
+  return (0);
+}
+
+/*----- That's all, folks -------------------------------------------------*/