1/* An lseek() function that detects pipes. 2 Copyright (C) 2007 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, 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 34off_t 35rpl_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} 63