1/* Copyright (C) 2006-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2006.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library 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 GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <signal.h>
21#include <time.h>
22#include <sys/poll.h>
23#include <kernel-features.h>
24#include <sysdep-cancel.h>
25
26
27#ifdef __NR_pselect6
28# ifndef __ASSUME_PSELECT
29static int __generic_pselect (int nfds, fd_set *readfds, fd_set *writefds,
30 fd_set *exceptfds,
31 const struct timespec *timeout,
32 const sigset_t *sigmask);
33# endif
34
35
36int
37__pselect (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
38 const struct timespec *timeout, const sigset_t *sigmask)
39{
40 /* The Linux kernel can in some situations update the timeout value.
41 We do not want that so use a local variable. */
42 struct timespec tval;
43 if (timeout != NULL)
44 {
45 tval = *timeout;
46 timeout = &tval;
47 }
48
49 /* Note: the system call expects 7 values but on most architectures
50 we can only pass in 6 directly. If there is an architecture with
51 support for more parameters a new version of this file needs to
52 be created. */
53 struct
54 {
55 __syscall_ulong_t ss;
56 __syscall_ulong_t ss_len;
57 } data;
58
59 data.ss = (__syscall_ulong_t) (uintptr_t) sigmask;
60 data.ss_len = _NSIG / 8;
61
62 int result;
63
64#ifndef CALL_PSELECT6
65# define CALL_PSELECT6(nfds, readfds, writefds, exceptfds, timeout, data) \
66 SYSCALL_CANCEL (pselect6, nfds, readfds, writefds, exceptfds, timeout, data)
67#endif
68
69 result = CALL_PSELECT6 (nfds, readfds, writefds, exceptfds, timeout,
70 &data);
71
72# ifndef __ASSUME_PSELECT
73 if (result == -1 && errno == ENOSYS)
74 result = __generic_pselect (nfds, readfds, writefds, exceptfds, timeout,
75 sigmask);
76# endif
77
78 return result;
79}
80weak_alias (__pselect, pselect)
81
82# ifndef __ASSUME_PSELECT
83# define __pselect static __generic_pselect
84# endif
85#endif
86
87#ifndef __ASSUME_PSELECT
88# include <misc/pselect.c>
89#endif
90