diff options
Diffstat (limited to 'lib/dup2.c')
| -rw-r--r-- | lib/dup2.c | 76 |
1 files changed, 52 insertions, 24 deletions
@@ -1,6 +1,6 @@ /* Duplicate an open file descriptor to a specified file descriptor. - Copyright (C) 1999, 2004-2007, 2009-2011 Free Software Foundation, Inc. + Copyright (C) 1999, 2004-2007, 2009-2013 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 @@ -25,21 +25,26 @@ #include <errno.h> #include <fcntl.h> -#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ -/* Get declarations of the Win32 API functions. */ -# define WIN32_LEAN_AND_MEAN -# include <windows.h> -#endif - #if HAVE_DUP2 # undef dup2 -int -rpl_dup2 (int fd, int desired_fd) +# 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 (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ + /* 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. */ @@ -52,6 +57,7 @@ rpl_dup2 (int fd, int desired_fd) } 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) @@ -59,26 +65,48 @@ rpl_dup2 (int fd, int desired_fd) errno = EBADF; return -1; } -# elif !defined __linux__ - /* On Haiku, dup2 (fd, fd) mistakenly clears FD_CLOEXEC. */ - if (fd == desired_fd) - return fcntl (fd, F_GETFL) == -1 ? -1 : fd; -# endif - result = dup2 (fd, desired_fd); -# ifdef __linux__ - /* Correct a Linux return value. - <http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.30.y.git;a=commitdiff;h=2b79bc4f7ebbd5af3c8b867968f9f15602d5f802> - */ - if (fd == desired_fd && result == (unsigned int) -EBADF) + + TRY_MSVC_INVAL + { + result = dup2 (fd, desired_fd); + } + CATCH_MSVC_INVAL { errno = EBADF; result = -1; } -# endif + DONE_MSVC_INVAL; + if (result == 0) result = desired_fd; - /* Correct a cygwin 1.5.x errno value. */ - else if (result == -1 && errno == EMFILE) + + 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 Haiku, dup2 (fd, fd) mistakenly clears FD_CLOEXEC. */ + 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) |