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