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
27static int
28do_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
45int
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
60int
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}
81libc_hidden_def (__libc_fcntl)
82
83weak_alias (__libc_fcntl, __fcntl)
84libc_hidden_weak (__fcntl)
85weak_alias (__libc_fcntl, fcntl)
86