libc/src/sys/mman/linux/msync.cpp

   1 //===---------- Linux implementation of the msync 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/msync.h"
  10
  11 #include "src/__support/OSUtil/syscall.h" // For internal syscall function.
  12
  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 LLVM_LIBC_FUNCTION(int, msync, (void *addr, size_t len, int flags)) {
  19   long ret = syscall_impl(SYS_msync, cpp::bit_cast<long>(addr), len, flags);
  20   if (ret < 0) {
  21     libc_errno = static_cast<int>(-ret);
  22     return -1;
  23   }
  24   return 0;
  25 }
  26 } // namespace LIBC_NAMESPACE_DECL