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source: kBuild/vendor/grep/2.12/lib/lseek.c@ 2595

Last change on this file since 2595 was 2595, checked in by bird, 12 years ago

gnu grep version 2.12 (grep-2.12.tar.xz, md5sum=8d2f0346d08b13c18afb81f0e8aa1e2f)

  • Property svn:eol-style set to native
File size: 1.8 KB
Line 
1/* An lseek() function that detects pipes.
2 Copyright (C) 2007, 2009-2012 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3, or (at your option)
7 any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License along
15 with this program; if not, see <http://www.gnu.org/licenses/>. */
16
17#include <config.h>
18
19/* Specification. */
20#include <unistd.h>
21
22#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
23/* Windows platforms. */
24/* Get GetFileType. */
25# include <windows.h>
26/* Get _get_osfhandle. */
27# include "msvc-nothrow.h"
28#else
29# include <sys/stat.h>
30#endif
31#include <errno.h>
32
33#undef lseek
34
35off_t
36rpl_lseek (int fd, off_t offset, int whence)
37{
38#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
39 /* mingw lseek mistakenly succeeds on pipes, sockets, and terminals. */
40 HANDLE h = (HANDLE) _get_osfhandle (fd);
41 if (h == INVALID_HANDLE_VALUE)
42 {
43 errno = EBADF;
44 return -1;
45 }
46 if (GetFileType (h) != FILE_TYPE_DISK)
47 {
48 errno = ESPIPE;
49 return -1;
50 }
51#else
52 /* BeOS lseek mistakenly succeeds on pipes... */
53 struct stat statbuf;
54 if (fstat (fd, &statbuf) < 0)
55 return -1;
56 if (!S_ISREG (statbuf.st_mode))
57 {
58 errno = ESPIPE;
59 return -1;
60 }
61#endif
62#if _GL_WINDOWS_64_BIT_OFF_T
63 return _lseeki64 (fd, offset, whence);
64#else
65 return lseek (fd, offset, whence);
66#endif
67}
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