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