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    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "replace.h"
  22 #include "talloc.h"
  23 #include "tevent.h"
  24 #include "tevent_internal.h"
  25 #include "tevent_util.h"
  26 #include <fcntl.h>
  27
  28 /**
  29   return the number of elements in a string list
  30 */
  31 size_t ev_str_list_length(const char **list)
  32 {
  33         size_t ret;
  34         for (ret=0;list && list[ret];ret++) /* noop */ ;
  35         return ret;
  36 }
  37
  38 /**
  39   add an entry to a string list
  40 */
  41 const char **ev_str_list_add(const char **list, const char *s)
  42 {
  43         size_t len = ev_str_list_length(list);
  44         const char **ret;
  45
  46         ret = talloc_realloc(NULL, list, const char *, len+2);
  47         if (ret == NULL) return NULL;
  48
  49         ret[len] = talloc_strdup(ret, s);
  50         if (ret[len] == NULL) return NULL;
  51
  52         ret[len+1] = NULL;
  53
  54         return ret;
  55 }
  56
  57
  58 /**
  59  Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
  60  else
  61   if SYSV use O_NDELAY
  62   if BSD use FNDELAY
  63 **/
  64
  65 int ev_set_blocking(int fd, bool set)
  66 {
  67         int val;
  68 #ifdef O_NONBLOCK
  69 #define FLAG_TO_SET O_NONBLOCK
  70 #else
  71 #ifdef SYSV
  72 #define FLAG_TO_SET O_NDELAY
  73 #else /* BSD */
  74 #define FLAG_TO_SET FNDELAY
  75 #endif
  76 #endif
  77
  78         if((val = fcntl(fd, F_GETFL, 0)) == -1)
  79                 return -1;
  80         if(set) /* Turn blocking on - ie. clear nonblock flag */
  81                 val &= ~FLAG_TO_SET;
  82         else
  83                 val |= FLAG_TO_SET;
  84         return fcntl( fd, F_SETFL, val);
  85 #undef FLAG_TO_SET
  86 }