HCoop / bpt / guile.git / blame
| Commit | Line | Data |
|---|---|---|
| 3d458a81 AW |
1 | /* An lseek() function that detects pipes. |
| 2 | Copyright (C) 2007, 2009-2011 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 Lesser General Public License as published by | |
| 6 | the Free Software Foundation; either version 2, 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 Lesser General Public License for more details. | |
| 13 | ||
| 14 | You should have received a copy of the GNU Lesser General Public License along | |
| 15 | with this program; if not, write to the Free Software Foundation, | |
| 16 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | |
| 17 | ||
| 18 | #include <config.h> | |
| 19 | ||
| 20 | /* Specification. */ | |
| 21 | #include <unistd.h> | |
| 22 | ||
| 23 | #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ | |
| 24 | /* Windows platforms. */ | |
| 25 | /* Get GetFileType. */ | |
| 26 | # include <windows.h> | |
| 27 | #else | |
| 28 | # include <sys/stat.h> | |
| 29 | #endif | |
| 30 | #include <errno.h> | |
| 31 | ||
| 32 | #undef lseek | |
| 33 | ||
| 34 | off_t | |
| 35 | rpl_lseek (int fd, off_t offset, int whence) | |
| 36 | { | |
| 37 | #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ | |
| 38 | /* mingw lseek mistakenly succeeds on pipes, sockets, and terminals. */ | |
| 39 | HANDLE h = (HANDLE) _get_osfhandle (fd); | |
| 40 | if (h == INVALID_HANDLE_VALUE) | |
| 41 | { | |
| 42 | errno = EBADF; | |
| 43 | return -1; | |
| 44 | } | |
| 45 | if (GetFileType (h) != FILE_TYPE_DISK) | |
| 46 | { | |
| 47 | errno = ESPIPE; | |
| 48 | return -1; | |
| 49 | } | |
| 50 | #else | |
| 51 | /* BeOS lseek mistakenly succeeds on pipes... */ | |
| 52 | struct stat statbuf; | |
| 53 | if (fstat (fd, &statbuf) < 0) | |
| 54 | return -1; | |
| 55 | if (!S_ISREG (statbuf.st_mode)) | |
| 56 | { | |
| 57 | errno = ESPIPE; | |
| 58 | return -1; | |
| 59 | } | |
| 60 | #endif | |
| 61 | return lseek (fd, offset, whence); | |
| 62 | } |