1 | /* Copyright (C) 2000-2017 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <assert.h> |
19 | #include <errno.h> |
20 | #include <sysdep-cancel.h> /* Must come before <fcntl.h>. */ |
21 | #include <fcntl.h> |
22 | #include <stdarg.h> |
23 | |
24 | #include <sys/syscall.h> |
25 | |
26 | |
27 | static int |
28 | do_fcntl (int fd, int cmd, void *arg) |
29 | { |
30 | if (cmd != F_GETOWN) |
31 | return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg); |
32 | |
33 | INTERNAL_SYSCALL_DECL (err); |
34 | struct f_owner_ex fex; |
35 | int res = INTERNAL_SYSCALL (fcntl, err, 3, fd, F_GETOWN_EX, &fex); |
36 | if (!INTERNAL_SYSCALL_ERROR_P (res, err)) |
37 | return fex.type == F_OWNER_GID ? -fex.pid : fex.pid; |
38 | |
39 | return INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (res, |
40 | err)); |
41 | } |
42 | |
43 | |
44 | #ifndef NO_CANCELLATION |
45 | int |
46 | __fcntl_nocancel (int fd, int cmd, ...) |
47 | { |
48 | va_list ap; |
49 | void *arg; |
50 | |
51 | va_start (ap, cmd); |
52 | arg = va_arg (ap, void *); |
53 | va_end (ap); |
54 | |
55 | return do_fcntl (fd, cmd, arg); |
56 | } |
57 | #endif |
58 | |
59 | |
60 | int |
61 | __libc_fcntl (int fd, int cmd, ...) |
62 | { |
63 | va_list ap; |
64 | void *arg; |
65 | |
66 | va_start (ap, cmd); |
67 | arg = va_arg (ap, void *); |
68 | va_end (ap); |
69 | |
70 | if (SINGLE_THREAD_P || cmd != F_SETLKW) |
71 | return do_fcntl (fd, cmd, arg); |
72 | |
73 | int oldtype = LIBC_CANCEL_ASYNC (); |
74 | |
75 | int result = do_fcntl (fd, cmd, arg); |
76 | |
77 | LIBC_CANCEL_RESET (oldtype); |
78 | |
79 | return result; |
80 | } |
81 | libc_hidden_def (__libc_fcntl) |
82 | |
83 | weak_alias (__libc_fcntl, __fcntl) |
84 | libc_hidden_weak (__fcntl) |
85 | weak_alias (__libc_fcntl, fcntl) |
86 | |