diff options
Diffstat (limited to 'gl/dup2.c')
| -rw-r--r-- | gl/dup2.c | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/gl/dup2.c b/gl/dup2.c deleted file mode 100644 index faede45050..0000000000 --- a/gl/dup2.c +++ /dev/null @@ -1,164 +0,0 @@ -/* Duplicate an open file descriptor to a specified file descriptor. - - Copyright (C) 1999, 2004-2007, 2009-2014 Free Software Foundation, Inc. - - This program is free software: you can redistribute it and/or modify - it under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, 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 Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with this program. If not, see <http://www.gnu.org/licenses/>. */ - -/* written by Paul Eggert */ - -#include <config.h> - -/* Specification. */ -#include <unistd.h> - -#include <errno.h> -#include <fcntl.h> - -#if HAVE_DUP2 - -# undef dup2 - -# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ - -/* Get declarations of the native Windows API functions. */ -# define WIN32_LEAN_AND_MEAN -# include <windows.h> - -# include "msvc-inval.h" - -/* Get _get_osfhandle. */ -# include "msvc-nothrow.h" - -static int -ms_windows_dup2 (int fd, int desired_fd) -{ - int result; - - /* If fd is closed, mingw hangs on dup2 (fd, fd). If fd is open, - dup2 (fd, fd) returns 0, but all further attempts to use fd in - future dup2 calls will hang. */ - if (fd == desired_fd) - { - if ((HANDLE) _get_osfhandle (fd) == INVALID_HANDLE_VALUE) - { - errno = EBADF; - return -1; - } - return fd; - } - - /* Wine 1.0.1 return 0 when desired_fd is negative but not -1: - http://bugs.winehq.org/show_bug.cgi?id=21289 */ - if (desired_fd < 0) - { - errno = EBADF; - return -1; - } - - TRY_MSVC_INVAL - { - result = dup2 (fd, desired_fd); - } - CATCH_MSVC_INVAL - { - errno = EBADF; - result = -1; - } - DONE_MSVC_INVAL; - - if (result == 0) - result = desired_fd; - - return result; -} - -# define dup2 ms_windows_dup2 - -# endif - -int -rpl_dup2 (int fd, int desired_fd) -{ - int result; - -# ifdef F_GETFL - /* On Linux kernels 2.6.26-2.6.29, dup2 (fd, fd) returns -EBADF. - On Cygwin 1.5.x, dup2 (1, 1) returns 0. - On Cygwin 1.7.17, dup2 (1, -1) dumps core. - On Cygwin 1.7.25, dup2 (1, 256) can dump core. - On Haiku, dup2 (fd, fd) mistakenly clears FD_CLOEXEC. */ -# if HAVE_SETDTABLESIZE - setdtablesize (desired_fd + 1); -# endif - if (desired_fd < 0) - fd = desired_fd; - if (fd == desired_fd) - return fcntl (fd, F_GETFL) == -1 ? -1 : fd; -# endif - - result = dup2 (fd, desired_fd); - - /* Correct an errno value on FreeBSD 6.1 and Cygwin 1.5.x. */ - if (result == -1 && errno == EMFILE) - errno = EBADF; -# if REPLACE_FCHDIR - if (fd != desired_fd && result != -1) - result = _gl_register_dup (fd, result); -# endif - return result; -} - -#else /* !HAVE_DUP2 */ - -/* On older platforms, dup2 did not exist. */ - -# ifndef F_DUPFD -static int -dupfd (int fd, int desired_fd) -{ - int duplicated_fd = dup (fd); - if (duplicated_fd < 0 || duplicated_fd == desired_fd) - return duplicated_fd; - else - { - int r = dupfd (fd, desired_fd); - int e = errno; - close (duplicated_fd); - errno = e; - return r; - } -} -# endif - -int -dup2 (int fd, int desired_fd) -{ - int result = fcntl (fd, F_GETFL) < 0 ? -1 : fd; - if (result == -1 || fd == desired_fd) - return result; - close (desired_fd); -# ifdef F_DUPFD - result = fcntl (fd, F_DUPFD, desired_fd); -# if REPLACE_FCHDIR - if (0 <= result) - result = _gl_register_dup (fd, result); -# endif -# else - result = dupfd (fd, desired_fd); -# endif - if (result == -1 && (errno == EMFILE || errno == EINVAL)) - errno = EBADF; - return result; -} -#endif /* !HAVE_DUP2 */ |