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//===---------- Linux implementation of the POSIX munmap function ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/sys/mman/munmap.h"
#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"
#include <errno.h>
#include <sys/syscall.h> // For syscall numbers.
namespace __llvm_libc {
// This function is currently linux only. It has to be refactored suitably if
// mmap is to be supported on non-linux operating systems also.
LLVM_LIBC_FUNCTION(int, munmap, (void *addr, size_t size)) {
long ret_val =
__llvm_libc::syscall(SYS_munmap, reinterpret_cast<long>(addr), size);
// A negative return value indicates an error with the magnitude of the
// value being the error code.
if (ret_val < 0) {
errno = -ret_val;
return -1;
}
return 0;
}
} // namespace __llvm_libc
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