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
50
51
52
53
54
55
|
//===-- Implementation of poll --------------------------------------------===//
//
// 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/poll/poll.h"
#include "hdr/types/nfds_t.h"
#include "hdr/types/struct_pollfd.h"
#include "hdr/types/struct_timespec.h"
#include "src/__support/OSUtil/syscall.h" // syscall_impl
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
#include <sys/syscall.h> // SYS_poll, SYS_ppoll
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, poll, (pollfd * fds, nfds_t nfds, int timeout)) {
int ret = 0;
#if defined(SYS_poll)
ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_poll, fds, nfds, timeout);
#else // no SYS_poll
timespec ts, *tsp;
if (timeout >= 0) {
ts.tv_sec = timeout / 1000;
ts.tv_nsec = (timeout % 1000) * 1000000;
tsp = &ts;
} else {
tsp = nullptr;
}
#if defined(SYS_ppoll)
ret =
LIBC_NAMESPACE::syscall_impl<int>(SYS_ppoll, fds, nfds, tsp, nullptr, 0);
#elif defined(SYS_ppoll_time64)
ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_ppoll_time64, fds, nfds, tsp,
nullptr, 0);
#else
#error "poll, ppoll, ppoll_time64 syscalls not available."
#endif // defined(SYS_ppoll) || defined(SYS_ppoll_time64)
#endif // defined(SYS_poll)
if (ret < 0) {
libc_errno = -ret;
return -1;
}
return ret;
}
} // namespace LIBC_NAMESPACE_DECL
|
