lib/tevent/tevent_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Andrew Tridgell 2005
   5    Copyright (C) Jelmer Vernooij 2005
   6
   7      ** NOTE! The following LGPL license applies to the tevent
   8      ** library. This does NOT imply that all of Samba is released
   9      ** under the LGPL
  10
  11    This library is free software; you can redistribute it and/or
  12    modify it under the terms of the GNU Lesser General Public
  13    License as published by the Free Software Foundation; either
  14    version 3 of the License, or (at your option) any later version.
  15
  16    This library is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19    Lesser General Public License for more details.
  20
  21    You should have received a copy of the GNU Lesser General Public
  22    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "replace.h"
  26 #include "talloc.h"
  27 #include "tevent.h"
  28 #include "tevent_internal.h"
  29 #include "tevent_util.h"
  30 #include <fcntl.h>
  31
  32 /**
  33  Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
  34  else
  35   if SYSV use O_NDELAY
  36   if BSD use FNDELAY
  37 **/
  38
  39 int ev_set_blocking(int fd, bool set)
  40 {
  41         int val;
  42 #ifdef O_NONBLOCK
  43 #define FLAG_TO_SET O_NONBLOCK
  44 #else
  45 #ifdef SYSV
  46 #define FLAG_TO_SET O_NDELAY
  47 #else /* BSD */
  48 #define FLAG_TO_SET FNDELAY
  49 #endif
  50 #endif
  51
  52         if((val = fcntl(fd, F_GETFL, 0)) == -1)
  53                 return -1;
  54         if(set) /* Turn blocking on - ie. clear nonblock flag */
  55                 val &= ~FLAG_TO_SET;
  56         else
  57                 val |= FLAG_TO_SET;
  58         return fcntl( fd, F_SETFL, val);
  59 #undef FLAG_TO_SET
  60 }
  61
  62 bool ev_set_close_on_exec(int fd)
  63 {
  64 #ifdef FD_CLOEXEC
  65         int val;
  66
  67         val = fcntl(fd, F_GETFD, 0);
  68         if (val >= 0) {
  69                 val |= FD_CLOEXEC;
  70                 val = fcntl(fd, F_SETFD, val);
  71                 if (val != -1) {
  72                         return true;
  73                 }
  74         }
  75 #endif
  76         return false;
  77 }