1 //===---------- Linux implementation of the epoll_create 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_create.h" 10 11 #include "src/__support/OSUtil/syscall.h" // For internal syscall function. 12 #include "src/__support/common.h" 13 #include "src/__support/macros/config.h" 14 #include "src/errno/libc_errno.h" 15 #include <sys/syscall.h> // For syscall numbers. 16 17 namespace LIBC_NAMESPACE_DECL { 18 19 LLVM_LIBC_FUNCTION(int, epoll_create, ([[maybe_unused]] int size)) { 20 #ifdef SYS_epoll_create 21 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_epoll_create, size); 22 #elif defined(SYS_epoll_create1) 23 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_epoll_create1, 0); 24 #else 25 #error \ 26 "epoll_create and epoll_create1 are unavailable. Unable to build epoll_create." 27 #endif 28 29 // A negative return value indicates an error with the magnitude of the 30 // value being the error code. 31 if (ret < 0) { 32 libc_errno = -ret; 33 return -1; 34 } 35 36 return ret; 37 } 38 39 } // namespace LIBC_NAMESPACE_DECL 40