1 //===------- Linux implementation of the remap_file_pages 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/mman/remap_file_pages.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, remap_file_pages, 20 (void *addr, size_t size, int prot, size_t pgoff, 21 int flags)) { 22 #ifdef SYS_remap_file_pages 23 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_remap_file_pages, 24 reinterpret_cast<long>(addr), 25 size, prot, pgoff, flags); 26 #else 27 #error "remap_file_pages syscall is not available." 28 #endif 29 30 // A negative return value indicates an error with the magnitude of the 31 // value being the error code. 32 if (ret < 0) { 33 libc_errno = -ret; 34 return -1; 35 } 36 37 return 0; 38 } 39 40 } // namespace LIBC_NAMESPACE_DECL 41