Line data    Source code

       1             : /*
       2             :     SSSD
       3             : 
       4             :     io.c
       5             : 
       6             :     Authors:
       7             :         Lukas Slebodnik <lslebodn@redhat.com>
       8             : 
       9             :     Copyright (C) 2012 Red Hat
      10             : 
      11             :     This program is free software; you can redistribute it and/or modify
      12             :     it under the terms of the GNU General Public License as published by
      13             :     the Free Software Foundation; either version 3 of the License, or
      14             :     (at your option) any later version.
      15             : 
      16             :     This program 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
      19             :     GNU General Public License for more details.
      20             : 
      21             :     You should have received a copy of the GNU General Public License
      22             :     along with this program.  If not, see <http://www.gnu.org/licenses/>.
      23             : */
      24             : 
      25             : #include "config.h"
      26             : 
      27             : #include <unistd.h>
      28             : #include <fcntl.h>
      29             : #include <errno.h>
      30             : 
      31             : #include "util/io.h"
      32             : 
      33             : /* CAUTION:
      34             :  * This file have to be minimalist and cannot include DEBUG macros
      35             :  * or header file util.h.
      36             :  */
      37             : 
      38         136 : int sss_open_cloexec(const char *pathname, int flags, int *ret)
      39             : {
      40             :     int fd;
      41             :     int oflags;
      42             : 
      43         136 :     oflags = flags;
      44             : #ifdef O_CLOEXEC
      45         136 :     oflags |= O_CLOEXEC;
      46             : #endif
      47             : 
      48         136 :     errno = 0;
      49         136 :     fd = open(pathname, oflags);
      50         136 :     if (fd == -1) {
      51         131 :         if (ret) {
      52         131 :             *ret = errno;
      53             :         }
      54         131 :         return -1;
      55             :     }
      56             : 
      57             : #ifndef O_CLOEXEC
      58             :     int v;
      59             : 
      60             :     v = fcntl(fd, F_GETFD, 0);
      61             :     /* we ignore an error, it's not fatal and there is nothing we
      62             :      * can do about it anyways */
      63             :     (void)fcntl(fd, F_SETFD, v | FD_CLOEXEC);
      64             : #endif
      65             : 
      66           5 :     return fd;
      67             : }
      68             : 
      69          15 : int sss_openat_cloexec(int dir_fd, const char *pathname, int flags, int *ret)
      70             : {
      71             :     int fd;
      72             :     int oflags;
      73             : 
      74          15 :     oflags = flags;
      75             : #ifdef O_CLOEXEC
      76          15 :     oflags |= O_CLOEXEC;
      77             : #endif
      78             : 
      79          15 :     errno = 0;
      80          15 :     fd = openat(dir_fd, pathname, oflags);
      81          15 :     if (fd == -1) {
      82           2 :         if (ret) {
      83           2 :             *ret = errno;
      84             :         }
      85           2 :         return -1;
      86             :     }
      87             : 
      88             : #ifndef O_CLOEXEC
      89             :     int v;
      90             : 
      91             :     v = fcntl(fd, F_GETFD, 0);
      92             :     /* we ignore an error, it's not fatal and there is nothing we
      93             :      * can do about it anyways */
      94             :     (void)fcntl(fd, F_SETFD, v | FD_CLOEXEC);
      95             : #endif
      96             : 
      97          13 :     return fd;
      98             : }