Mercurial > gnulib
view lib/freopen.c @ 40132:6bcaf5dcb02b
fdatasync: Fix compilation error on Android 4.3.
* m4/fdatasync.m4 (gl_FUNC_FDATASYNC): On platforms other than Solaris,
test whether fdatasync() exists.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Fri, 25 Jan 2019 00:15:50 +0100 |
parents | b06060465f09 |
children |
line wrap: on
line source
/* Open a stream to a file. Copyright (C) 2007-2019 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ /* Written by Bruno Haible <bruno@clisp.org>, 2007. */ /* If the user's config.h happens to include <stdio.h>, let it include only the system's <stdio.h> here, so that orig_freopen doesn't recurse to rpl_freopen. */ #define _GL_ALREADY_INCLUDING_STDIO_H #include <config.h> /* Get the original definition of freopen. It might be defined as a macro. */ #include <stdio.h> #undef _GL_ALREADY_INCLUDING_STDIO_H #include <errno.h> static FILE * orig_freopen (const char *filename, const char *mode, FILE *stream) { return freopen (filename, mode, stream); } /* Specification. */ /* Write "stdio.h" here, not <stdio.h>, otherwise OSF/1 5.1 DTK cc eliminates this include because of the preliminary #include <stdio.h> above. */ #include "stdio.h" #include <fcntl.h> #include <string.h> #include <unistd.h> FILE * rpl_freopen (const char *filename, const char *mode, FILE *stream) { FILE *result; #if defined _WIN32 && ! defined __CYGWIN__ char const *null_device = "NUL"; if (filename && strcmp (filename, "/dev/null") == 0) filename = null_device; #else char const *null_device = "/dev/null"; #endif #ifdef __KLIBC__ errno = 0; #endif result = orig_freopen (filename, mode, stream); if (!result) { #ifdef __KLIBC__ /* On OS/2 kLIBC, freopen returns NULL even if it is successful if filename is NULL. */ if (!filename && !errno) result = stream; #endif } else if (filename) { int fd = fileno (result); if (dup2 (fd, fd) < 0 && errno == EBADF) { int nullfd = open (null_device, O_RDONLY | O_CLOEXEC); int err = 0; if (nullfd != fd) { if (dup2 (nullfd, fd) < 0) err = 1; close (nullfd); } if (!err) result = orig_freopen (filename, mode, result); } } return result; }