diff options
Diffstat (limited to 'lib/dup2.c')
| -rw-r--r-- | lib/dup2.c | 118 |
1 files changed, 36 insertions, 82 deletions
diff --git a/lib/dup2.c b/lib/dup2.c index 85c1a44401a..1c766ab38ec 100644 --- a/lib/dup2.c +++ b/lib/dup2.c @@ -1,18 +1,18 @@ /* Duplicate an open file descriptor to a specified file descriptor. - Copyright (C) 1999, 2004-2007, 2009-2017 Free Software Foundation, Inc. + Copyright (C) 1999, 2004-2007, 2009-2022 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 3 of the License, or - (at your option) any later version. + This file 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, + This file 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. + GNU Lesser General Public License for more details. - You should have received a copy of the GNU General Public License + You should have received a copy of the GNU Lesser General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ /* written by Paul Eggert */ @@ -25,28 +25,26 @@ #include <errno.h> #include <fcntl.h> -#if HAVE_DUP2 +#undef dup2 -# undef dup2 - -# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ +#if defined _WIN32 && ! defined __CYGWIN__ /* Get declarations of the native Windows API functions. */ -# define WIN32_LEAN_AND_MEAN -# include <windows.h> +# define WIN32_LEAN_AND_MEAN +# include <windows.h> -# if HAVE_MSVC_INVALID_PARAMETER_HANDLER -# include "msvc-inval.h" -# endif +# if HAVE_MSVC_INVALID_PARAMETER_HANDLER +# include "msvc-inval.h" +# endif /* Get _get_osfhandle. */ -# if GNULIB_MSVC_NOTHROW -# include "msvc-nothrow.h" -# else -# include <io.h> -# endif +# if GNULIB_MSVC_NOTHROW +# include "msvc-nothrow.h" +# else +# include <io.h> +# endif -# if HAVE_MSVC_INVALID_PARAMETER_HANDLER +# if HAVE_MSVC_INVALID_PARAMETER_HANDLER static int dup2_nothrow (int fd, int desired_fd) { @@ -54,7 +52,7 @@ dup2_nothrow (int fd, int desired_fd) TRY_MSVC_INVAL { - result = dup2 (fd, desired_fd); + result = _dup2 (fd, desired_fd); } CATCH_MSVC_INVAL { @@ -65,9 +63,9 @@ dup2_nothrow (int fd, int desired_fd) return result; } -# else -# define dup2_nothrow dup2 -# endif +# else +# define dup2_nothrow _dup2 +# endif static int ms_windows_dup2 (int fd, int desired_fd) @@ -103,11 +101,11 @@ ms_windows_dup2 (int fd, int desired_fd) return result; } -# define dup2 ms_windows_dup2 +# define dup2 ms_windows_dup2 -# elif defined __KLIBC__ +#elif defined __KLIBC__ -# include <InnoTekLIBC/backend.h> +# include <InnoTekLIBC/backend.h> static int klibc_dup2dirfd (int fd, int desired_fd) @@ -155,81 +153,37 @@ klibc_dup2 (int fd, int desired_fd) return dupfd; } -# define dup2 klibc_dup2 -# endif +# define dup2 klibc_dup2 +#endif int rpl_dup2 (int fd, int desired_fd) { int result; -# ifdef F_GETFL +#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 +# if HAVE_SETDTABLESIZE setdtablesize (desired_fd + 1); -# endif +# endif if (desired_fd < 0) fd = desired_fd; if (fd == desired_fd) return fcntl (fd, F_GETFL) == -1 ? -1 : fd; -# endif +#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 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; +#endif return result; } -#endif /* !HAVE_DUP2 */ |