1 //===---------- Linux implementation of the epoll_ctl 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_ctl.h" 10 11 #include "hdr/types/struct_epoll_event.h" 12 #include "src/__support/OSUtil/syscall.h" // For internal syscall function. 13 #include "src/__support/common.h" 14 #include "src/__support/macros/config.h" 15 #include "src/errno/libc_errno.h" 16 #include <sys/syscall.h> // For syscall numbers. 17 18 namespace LIBC_NAMESPACE_DECL { 19 20 LLVM_LIBC_FUNCTION(int, epoll_ctl, 21 (int epfd, int op, int fd, epoll_event *event)) { 22 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_epoll_ctl, epfd, op, fd, 23 reinterpret_cast<long>(event)); 24 25 // A negative return value indicates an error with the magnitude of the 26 // value being the error code. 27 if (ret < 0) { 28 libc_errno = -ret; 29 return -1; 30 } 31 32 return ret; 33 } 34 35 } // namespace LIBC_NAMESPACE_DECL 36