ctdb/lib/util/util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Andrew Tridgell 2005
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "system/filesys.h"
  22
  23
  24 /**
  25  Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
  26  else
  27   if SYSV use O_NDELAY
  28   if BSD use FNDELAY
  29 **/
  30
  31 _PUBLIC_ int set_blocking(int fd, bool set)
  32 {
  33         int val;
  34 #ifdef O_NONBLOCK
  35 #define FLAG_TO_SET O_NONBLOCK
  36 #else
  37 #ifdef SYSV
  38 #define FLAG_TO_SET O_NDELAY
  39 #else /* BSD */
  40 #define FLAG_TO_SET FNDELAY
  41 #endif
  42 #endif
  43
  44         if((val = fcntl(fd, F_GETFL, 0)) == -1)
  45                 return -1;
  46         if(set) /* Turn blocking on - ie. clear nonblock flag */
  47                 val &= ~FLAG_TO_SET;
  48         else
  49                 val |= FLAG_TO_SET;
  50         return fcntl( fd, F_SETFL, val);
  51 #undef FLAG_TO_SET
  52 }