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6ec2e0f5 SDJ |
1 | /* Duplicate an open file descriptor. |
2 | ||
7a6dbc2f | 3 | Copyright (C) 2011-2018 Free Software Foundation, Inc. |
6ec2e0f5 SDJ |
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 | |
7a6dbc2f | 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
6ec2e0f5 SDJ |
17 | |
18 | #include <config.h> | |
19 | ||
20 | /* Specification. */ | |
21 | #include <unistd.h> | |
22 | ||
23 | #include <errno.h> | |
24 | ||
7a6dbc2f SDJ |
25 | #if HAVE_MSVC_INVALID_PARAMETER_HANDLER |
26 | # include "msvc-inval.h" | |
27 | #endif | |
6ec2e0f5 SDJ |
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 | } |