| 1 | /* Duplicate an open file descriptor. |
| 2 | |
| 3 | Copyright (C) 2011-2020 Free Software Foundation, Inc. |
| 4 | |
| 5 | This program is free software: you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include <config.h> |
| 19 | |
| 20 | /* Specification. */ |
| 21 | #include <unistd.h> |
| 22 | |
| 23 | #include <errno.h> |
| 24 | |
| 25 | #if HAVE_MSVC_INVALID_PARAMETER_HANDLER |
| 26 | # include "msvc-inval.h" |
| 27 | #endif |
| 28 | |
| 29 | #undef dup |
| 30 | |
| 31 | #if HAVE_MSVC_INVALID_PARAMETER_HANDLER |
| 32 | static int |
| 33 | dup_nothrow (int fd) |
| 34 | { |
| 35 | int result; |
| 36 | |
| 37 | TRY_MSVC_INVAL |
| 38 | { |
| 39 | result = dup (fd); |
| 40 | } |
| 41 | CATCH_MSVC_INVAL |
| 42 | { |
| 43 | result = -1; |
| 44 | errno = EBADF; |
| 45 | } |
| 46 | DONE_MSVC_INVAL; |
| 47 | |
| 48 | return result; |
| 49 | } |
| 50 | #elif defined __KLIBC__ |
| 51 | # include <fcntl.h> |
| 52 | # include <sys/stat.h> |
| 53 | |
| 54 | # include <InnoTekLIBC/backend.h> |
| 55 | |
| 56 | static int |
| 57 | dup_nothrow (int fd) |
| 58 | { |
| 59 | int dupfd; |
| 60 | struct stat sbuf; |
| 61 | |
| 62 | dupfd = dup (fd); |
| 63 | if (dupfd == -1 && errno == ENOTSUP \ |
| 64 | && !fstat (fd, &sbuf) && S_ISDIR (sbuf.st_mode)) |
| 65 | { |
| 66 | char path[_MAX_PATH]; |
| 67 | |
| 68 | /* Get a path from fd */ |
| 69 | if (!__libc_Back_ioFHToPath (fd, path, sizeof (path))) |
| 70 | dupfd = open (path, O_RDONLY); |
| 71 | } |
| 72 | |
| 73 | return dupfd; |
| 74 | } |
| 75 | #else |
| 76 | # define dup_nothrow dup |
| 77 | #endif |
| 78 | |
| 79 | int |
| 80 | rpl_dup (int fd) |
| 81 | { |
| 82 | int result = dup_nothrow (fd); |
| 83 | #if REPLACE_FCHDIR |
| 84 | if (result >= 0) |
| 85 | result = _gl_register_dup (fd, result); |
| 86 | #endif |
| 87 | return result; |
| 88 | } |