Mercurial > gnulib
view lib/lseek.c @ 40204:db8428454956
autoupdate
author | Karl Berry <karl@freefriends.org> |
---|---|
date | Sun, 03 Mar 2019 14:09:37 -0800 |
parents | b06060465f09 |
children |
line wrap: on
line source
/* An lseek() function that detects pipes. Copyright (C) 2007, 2009-2019 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 2, 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/>. */ #include <config.h> /* Specification. */ #include <unistd.h> #if defined _WIN32 && ! defined __CYGWIN__ /* Windows platforms. */ /* Get GetFileType. */ # include <windows.h> /* Get _get_osfhandle. */ # if GNULIB_MSVC_NOTHROW # include "msvc-nothrow.h" # else # include <io.h> # endif #else # include <sys/stat.h> #endif #include <errno.h> #undef lseek off_t rpl_lseek (int fd, off_t offset, int whence) { #if defined _WIN32 && ! defined __CYGWIN__ /* mingw lseek mistakenly succeeds on pipes, sockets, and terminals. */ HANDLE h = (HANDLE) _get_osfhandle (fd); if (h == INVALID_HANDLE_VALUE) { errno = EBADF; return -1; } if (GetFileType (h) != FILE_TYPE_DISK) { errno = ESPIPE; return -1; } #else /* BeOS lseek mistakenly succeeds on pipes... */ struct stat statbuf; if (fstat (fd, &statbuf) < 0) return -1; if (!S_ISREG (statbuf.st_mode)) { errno = ESPIPE; return -1; } #endif #if _GL_WINDOWS_64_BIT_OFF_T return _lseeki64 (fd, offset, whence); #else return lseek (fd, offset, whence); #endif }