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#undef _FORTIFY_SOURCE
30#include <errno.h>
31#include <sys/poll.h>
32#include <sys/select.h>
33
34#include "private/bionic_time_conversions.h"
35#include "private/kernel_sigset_t.h"
36
37extern "C" int __ppoll(pollfd*, unsigned int, timespec*, const kernel_sigset_t*, size_t);
38extern "C" int __pselect6(int, fd_set*, fd_set*, fd_set*, timespec*, void*);
39
40int poll(pollfd* fds, nfds_t fd_count, int ms) {
41  timespec ts;
42  timespec* ts_ptr = NULL;
43  if (ms >= 0) {
44    timespec_from_ms(ts, ms);
45    ts_ptr = &ts;
46  }
47  return __ppoll(fds, fd_count, ts_ptr, NULL, 0);
48}
49
50int ppoll(pollfd* fds, nfds_t fd_count, const timespec* ts, const sigset_t* ss) {
51  timespec mutable_ts;
52  timespec* mutable_ts_ptr = NULL;
53  if (ts != NULL) {
54    mutable_ts = *ts;
55    mutable_ts_ptr = &mutable_ts;
56  }
57
58  kernel_sigset_t kernel_ss;
59  kernel_sigset_t* kernel_ss_ptr = NULL;
60  if (ss != NULL) {
61    kernel_ss.set(ss);
62    kernel_ss_ptr = &kernel_ss;
63  }
64
65  return __ppoll(fds, fd_count, mutable_ts_ptr, kernel_ss_ptr, sizeof(kernel_ss));
66}
67
68int select(int fd_count, fd_set* read_fds, fd_set* write_fds, fd_set* error_fds, timeval* tv) {
69  timespec ts;
70  timespec* ts_ptr = NULL;
71  if (tv != NULL) {
72    if (!timespec_from_timeval(ts, *tv)) {
73      errno = EINVAL;
74      return -1;
75    }
76    ts_ptr = &ts;
77  }
78  int result = __pselect6(fd_count, read_fds, write_fds, error_fds, ts_ptr, NULL);
79  if (tv != NULL) {
80    timeval_from_timespec(*tv, ts);
81  }
82  return result;
83}
84
85int pselect(int fd_count, fd_set* read_fds, fd_set* write_fds, fd_set* error_fds,
86            const timespec* ts, const sigset_t* ss) {
87  timespec mutable_ts;
88  timespec* mutable_ts_ptr = NULL;
89  if (ts != NULL) {
90    mutable_ts = *ts;
91    mutable_ts_ptr = &mutable_ts;
92  }
93
94  kernel_sigset_t kernel_ss;
95  kernel_sigset_t* kernel_ss_ptr = NULL;
96  if (ss != NULL) {
97    kernel_ss.set(ss);
98    kernel_ss_ptr = &kernel_ss;
99  }
100
101  // The Linux kernel only handles 6 arguments and this system call really needs 7,
102  // so the last argument is a void* pointing to:
103  struct pselect6_extra_data_t {
104    uintptr_t ss_addr;
105    size_t ss_len;
106  };
107  pselect6_extra_data_t extra_data;
108  extra_data.ss_addr = reinterpret_cast<uintptr_t>(kernel_ss_ptr);
109  extra_data.ss_len = sizeof(kernel_ss);
110
111  return __pselect6(fd_count, read_fds, write_fds, error_fds, mutable_ts_ptr, &extra_data);
112}
113