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 <errno.h>
30 #include <sys/epoll.h>
31
32 #include "private/SigSetConverter.h"
33 #include "private/bionic_fdtrack.h"
34
35 extern "C" int __epoll_create1(int flags);
36 extern "C" int __epoll_pwait(int, epoll_event*, int, int, const sigset64_t*, size_t);
37 extern "C" int __epoll_pwait2(int, epoll_event*, int, const __kernel_timespec*, const sigset64_t*,
38 size_t);
39
epoll_create(int size)40 int epoll_create(int size) {
41 if (size <= 0) {
42 errno = EINVAL;
43 return -1;
44 }
45 return FDTRACK_CREATE(__epoll_create1(0));
46 }
47
epoll_create1(int flags)48 int epoll_create1(int flags) {
49 return FDTRACK_CREATE(__epoll_create1(flags));
50 }
51
epoll_pwait(int fd,epoll_event * events,int max_events,int timeout,const sigset_t * ss)52 int epoll_pwait(int fd, epoll_event* events, int max_events, int timeout, const sigset_t* ss) {
53 SigSetConverter set{ss};
54 return epoll_pwait64(fd, events, max_events, timeout, set.ptr);
55 }
56
epoll_pwait64(int fd,epoll_event * events,int max_events,int timeout,const sigset64_t * ss)57 int epoll_pwait64(int fd, epoll_event* events, int max_events, int timeout, const sigset64_t* ss) {
58 return __epoll_pwait(fd, events, max_events, timeout, ss, sizeof(*ss));
59 }
60
epoll_pwait2(int fd,epoll_event * events,int max_events,const timespec * timeout,const sigset_t * ss)61 int epoll_pwait2(int fd, epoll_event* events, int max_events, const timespec* timeout,
62 const sigset_t* ss) {
63 SigSetConverter set{ss};
64 return epoll_pwait2_64(fd, events, max_events, timeout, set.ptr);
65 }
66
epoll_pwait2_64(int fd,epoll_event * events,int max_events,const timespec * timeout,const sigset64_t * ss)67 int epoll_pwait2_64(int fd, epoll_event* events, int max_events, const timespec* timeout,
68 const sigset64_t* ss) {
69 // epoll_pwait2() is our first syscall that assumes a 64-bit time_t even for
70 // 32-bit processes, so for ILP32 we need to convert.
71 // TODO: factor this out into a TimeSpecConverter as/when we get more syscalls like this.
72 #if __LP64__
73 const __kernel_timespec* kts_ptr = reinterpret_cast<const __kernel_timespec*>(timeout);
74 #else
75 __kernel_timespec kts;
76 const __kernel_timespec* kts_ptr = nullptr;
77 if (timeout) {
78 kts.tv_sec = timeout->tv_sec;
79 kts.tv_nsec = timeout->tv_nsec;
80 kts_ptr = &kts;
81 }
82 #endif
83 return __epoll_pwait2(fd, events, max_events, kts_ptr, ss, sizeof(*ss));
84 }
85
epoll_wait(int fd,struct epoll_event * events,int max_events,int timeout)86 int epoll_wait(int fd, struct epoll_event* events, int max_events, int timeout) {
87 return epoll_pwait64(fd, events, max_events, timeout, nullptr);
88 }
89