1 //===---------- Linux implementation of the POSIX munmap 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/munmap.h" 10 11 #include "config/linux/syscall.h" // For internal syscall function. 12 #include "include/sys/syscall.h" // For syscall numbers. 13 #include "src/__support/common.h" 14 #include "src/errno/llvmlibc_errno.h" 15 16 namespace __llvm_libc { 17 18 // This function is currently linux only. It has to be refactored suitably if 19 // mmap is to be supported on non-linux operating systems also. 20 LLVM_LIBC_FUNCTION(int, munmap, (void *addr, size_t size)) { 21 long ret_val = 22 __llvm_libc::syscall(SYS_munmap, reinterpret_cast<long>(addr), size); 23 24 // A negative return value indicates an error with the magnitude of the 25 // value being the error code. 26 if (ret_val < 0) { 27 llvmlibc_errno = -ret_val; 28 return -1; 29 } 30 31 return 0; 32 } 33 34 } // namespace __llvm_libc 35