44 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/sys/epoll/epoll_pwait.h"10 11#include "hdr/signal_macros.h" // for NSIG12#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 22namespace LIBC_NAMESPACE_DECL {23 24LLVM_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 the32 // 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_DECL44