1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
//===---------- Linux implementation of the epoll_wait function -----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/sys/epoll/epoll_wait.h"
#include "hdr/signal_macros.h" // for NSIG
#include "hdr/types/sigset_t.h"
#include "hdr/types/struct_epoll_event.h"
#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
#include "src/__support/macros/sanitizer.h"
#include <sys/syscall.h> // For syscall numbers.
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, epoll_wait,
(int epfd, struct epoll_event *events, int maxevents,
int timeout)) {
#ifdef SYS_epoll_wait
int ret = LIBC_NAMESPACE::syscall_impl<int>(
SYS_epoll_wait, epfd, reinterpret_cast<long>(events), maxevents, timeout);
#elif defined(SYS_epoll_pwait)
int ret = LIBC_NAMESPACE::syscall_impl<int>(
SYS_epoll_pwait, epfd, reinterpret_cast<long>(events), maxevents, timeout,
reinterpret_cast<long>(nullptr), NSIG / 8);
#else
#error "epoll_wait and epoll_pwait are unavailable. Unable to build epoll_wait."
#endif
// A negative return value indicates an error with the magnitude of the
// value being the error code.
if (ret < 0) {
libc_errno = -ret;
return -1;
}
MSAN_UNPOISON(events, ret * sizeof(struct epoll_event));
return ret;
}
} // namespace LIBC_NAMESPACE_DECL
|
