/* Duplicate an open file descriptor. Copyright (C) 2011-2020 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 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> #include <errno.h> #if HAVE_MSVC_INVALID_PARAMETER_HANDLER # include "msvc-inval.h" #endif #undef dup #if HAVE_MSVC_INVALID_PARAMETER_HANDLER static int dup_nothrow (int fd) { int result; TRY_MSVC_INVAL { result = dup (fd); } CATCH_MSVC_INVAL { result = -1; errno = EBADF; } DONE_MSVC_INVAL; return result; } #elif defined __KLIBC__ # include <fcntl.h> # include <sys/stat.h> # include <InnoTekLIBC/backend.h> static int dup_nothrow (int fd) { int dupfd; struct stat sbuf; dupfd = dup (fd); if (dupfd == -1 && errno == ENOTSUP \ && !fstat (fd, &sbuf) && S_ISDIR (sbuf.st_mode)) { char path[_MAX_PATH]; /* Get a path from fd */ if (!__libc_Back_ioFHToPath (fd, path, sizeof (path))) dupfd = open (path, O_RDONLY); } return dupfd; } #else # define dup_nothrow dup #endif int rpl_dup (int fd) { int result = dup_nothrow (fd); #if REPLACE_FCHDIR if (result >= 0) result = _gl_register_dup (fd, result); #endif return result; } |