1 /*
2 * Copyright (C) 2013 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/poll.h>
30 #include <sys/select.h>
31
32 #include "private/bionic_time_conversions.h"
33 #include "private/kernel_sigset_t.h"
34
35 extern "C" int __ppoll(pollfd*, unsigned int, timespec*, const kernel_sigset_t*, size_t);
36 extern "C" int __pselect6(int, fd_set*, fd_set*, fd_set*, timespec*, void*);
37
poll(pollfd * fds,nfds_t fd_count,int ms)38 int poll(pollfd* fds, nfds_t fd_count, int ms) {
39 timespec ts;
40 timespec* ts_ptr = NULL;
41 if (ms >= 0) {
42 timespec_from_ms(ts, ms);
43 ts_ptr = &ts;
44 }
45 return __ppoll(fds, fd_count, ts_ptr, NULL, 0);
46 }
47
ppoll(pollfd * fds,nfds_t fd_count,const timespec * ts,const sigset_t * ss)48 int ppoll(pollfd* fds, nfds_t fd_count, const timespec* ts, const sigset_t* ss) {
49 timespec mutable_ts;
50 timespec* mutable_ts_ptr = NULL;
51 if (ts != NULL) {
52 mutable_ts = *ts;
53 mutable_ts_ptr = &mutable_ts;
54 }
55
56 kernel_sigset_t kernel_ss;
57 kernel_sigset_t* kernel_ss_ptr = NULL;
58 if (ss != NULL) {
59 kernel_ss.set(ss);
60 kernel_ss_ptr = &kernel_ss;
61 }
62
63 return __ppoll(fds, fd_count, mutable_ts_ptr, kernel_ss_ptr, sizeof(kernel_ss));
64 }
65
select(int fd_count,fd_set * read_fds,fd_set * write_fds,fd_set * error_fds,timeval * tv)66 int select(int fd_count, fd_set* read_fds, fd_set* write_fds, fd_set* error_fds, timeval* tv) {
67 timespec ts;
68 timespec* ts_ptr = NULL;
69 if (tv != NULL) {
70 if (!timespec_from_timeval(ts, *tv)) {
71 errno = EINVAL;
72 return -1;
73 }
74 ts_ptr = &ts;
75 }
76 int result = __pselect6(fd_count, read_fds, write_fds, error_fds, ts_ptr, NULL);
77 if (tv != NULL) {
78 timeval_from_timespec(*tv, ts);
79 }
80 return result;
81 }
82
pselect(int fd_count,fd_set * read_fds,fd_set * write_fds,fd_set * error_fds,const timespec * ts,const sigset_t * ss)83 int pselect(int fd_count, fd_set* read_fds, fd_set* write_fds, fd_set* error_fds,
84 const timespec* ts, const sigset_t* ss) {
85 timespec mutable_ts;
86 timespec* mutable_ts_ptr = NULL;
87 if (ts != NULL) {
88 mutable_ts = *ts;
89 mutable_ts_ptr = &mutable_ts;
90 }
91
92 kernel_sigset_t kernel_ss;
93 kernel_sigset_t* kernel_ss_ptr = NULL;
94 if (ss != NULL) {
95 kernel_ss.set(ss);
96 kernel_ss_ptr = &kernel_ss;
97 }
98
99 // The Linux kernel only handles 6 arguments and this system call really needs 7,
100 // so the last argument is a void* pointing to:
101 struct pselect6_extra_data_t {
102 uintptr_t ss_addr;
103 size_t ss_len;
104 };
105 pselect6_extra_data_t extra_data;
106 extra_data.ss_addr = reinterpret_cast<uintptr_t>(kernel_ss_ptr);
107 extra_data.ss_len = sizeof(kernel_ss);
108
109 return __pselect6(fd_count, read_fds, write_fds, error_fds, mutable_ts_ptr, &extra_data);
110 }
111