LCOV - code coverage report
Current view: top level - lib - fd-reopen.c (source / functions) Hit Total Coverage
Test: coreutils.info Lines: 9 9 100.0 %
Date: 2018-01-30 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /* Invoke open, but return either a desired file descriptor or -1.
       2             : 
       3             :    Copyright (C) 2005, 2006, 2008 Free Software Foundation, Inc.
       4             : 
       5             :    This program is free software: you can redistribute it and/or modify
       6             :    it under the terms of the GNU General Public License as published by
       7             :    the Free Software Foundation, either version 3 of the License, or
       8             :    (at your option) any later version.
       9             : 
      10             :    This program is distributed in the hope that it will be useful,
      11             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      12             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      13             :    GNU General Public License for more details.
      14             : 
      15             :    You should have received a copy of the GNU General Public License
      16             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
      17             : 
      18             : /* Written by Paul Eggert.  */
      19             : 
      20             : #include <config.h>
      21             : 
      22             : #include "fd-reopen.h"
      23             : 
      24             : #include <errno.h>
      25             : #include <fcntl.h>
      26             : #include <unistd.h>
      27             : 
      28             : /* Open a file to a particular file descriptor.  This is like standard
      29             :    `open', except it always returns DESIRED_FD if successful.  */
      30             : 
      31             : int
      32          77 : fd_reopen (int desired_fd, char const *file, int flags, mode_t mode)
      33             : {
      34          77 :   int fd = open (file, flags, mode);
      35             : 
      36          77 :   if (fd == desired_fd || fd < 0)
      37          32 :     return fd;
      38             :   else
      39             :     {
      40          45 :       int fd2 = dup2 (fd, desired_fd);
      41          45 :       int saved_errno = errno;
      42          45 :       close (fd);
      43          45 :       errno = saved_errno;
      44          45 :       return fd2;
      45             :     }
      46             : }

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