lib/util/blocking.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 2001-2002
   6    Copyright (C) Simo Sorce 2001
   7    Copyright (C) Jim McDonough (jmcd@us.ibm.com)  2003.
   8    Copyright (C) James J Myers 2003
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "system/network.h"
  26 #include "system/filesys.h"
  27 #include "system/locale.h"
  28 #undef malloc
  29 #undef strcasecmp
  30 #undef strncasecmp
  31 #undef strdup
  32 #undef realloc
  33
  34 /**
  35  Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
  36  else
  37   if SYSV use O_NDELAY
  38   if BSD use FNDELAY
  39 **/
  40
  41 _PUBLIC_ int set_blocking(int fd, bool set)
  42 {
  43         int val;
  44 #ifdef O_NONBLOCK
  45 #define FLAG_TO_SET O_NONBLOCK
  46 #else
  47 #ifdef SYSV
  48 #define FLAG_TO_SET O_NDELAY
  49 #else /* BSD */
  50 #define FLAG_TO_SET FNDELAY
  51 #endif
  52 #endif
  53
  54         if((val = fcntl(fd, F_GETFL, 0)) == -1)
  55                 return -1;
  56         if(set) /* Turn blocking on - ie. clear nonblock flag */
  57                 val &= ~FLAG_TO_SET;
  58         else
  59                 val |= FLAG_TO_SET;
  60         return fcntl( fd, F_SETFL, val);
  61 #undef FLAG_TO_SET
  62 }
  63
  64
  65 _PUBLIC_ bool smb_set_close_on_exec(int fd)
  66 {
  67 #ifdef FD_CLOEXEC
  68         int val;
  69
  70         val = fcntl(fd, F_GETFD, 0);
  71         if (val >= 0) {
  72                 val |= FD_CLOEXEC;
  73                 val = fcntl(fd, F_SETFD, val);
  74                 if (val != -1) {
  75                         return true;
  76                 }
  77         }
  78 #endif
  79         return false;
  80 }