93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
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/* Duplicate an open file descriptor.
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Copyright (C) 2011-2021 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include <unistd.h>
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#include <errno.h>
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#if HAVE_MSVC_INVALID_PARAMETER_HANDLER
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# include "msvc-inval.h"
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#endif
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#undef dup
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#if defined _WIN32 && !defined __CYGWIN__
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# if HAVE_MSVC_INVALID_PARAMETER_HANDLER
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static int
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dup_nothrow (int fd)
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{
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int result;
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TRY_MSVC_INVAL
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{
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result = _dup (fd);
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}
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CATCH_MSVC_INVAL
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{
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result = -1;
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errno = EBADF;
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}
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DONE_MSVC_INVAL;
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return result;
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}
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# else
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# define dup_nothrow _dup
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# endif
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#elif defined __KLIBC__
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# include <fcntl.h>
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# include <sys/stat.h>
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# include <InnoTekLIBC/backend.h>
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static int
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dup_nothrow (int fd)
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{
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int dupfd;
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struct stat sbuf;
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dupfd = dup (fd);
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if (dupfd == -1 && errno == ENOTSUP \
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&& !fstat (fd, &sbuf) && S_ISDIR (sbuf.st_mode))
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{
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char path[_MAX_PATH];
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/* Get a path from fd */
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if (!__libc_Back_ioFHToPath (fd, path, sizeof (path)))
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dupfd = open (path, O_RDONLY);
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}
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return dupfd;
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}
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#else
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# define dup_nothrow dup
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#endif
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int
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rpl_dup (int fd)
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{
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int result = dup_nothrow (fd);
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#if REPLACE_FCHDIR
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if (result >= 0)
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result = _gl_register_dup (fd, result);
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#endif
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return result;
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}
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