1 //===---------- Linux implementation of the mrelease 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/process_mrelease.h" 10 11 #include "src/__support/OSUtil/syscall.h" // For internal syscall function. 12 #include "src/__support/common.h" 13 14 #include "src/__support/macros/config.h" 15 #include "src/errno/libc_errno.h" 16 #include <linux/param.h> // For EXEC_PAGESIZE. 17 #include <sys/syscall.h> // For syscall numbers. 18 19 namespace LIBC_NAMESPACE_DECL { 20 21 LLVM_LIBC_FUNCTION(int, process_mrelease, (int pidfd, unsigned int flags)) { 22 #ifdef SYS_process_mrelease 23 long ret = 24 LIBC_NAMESPACE::syscall_impl<int>(SYS_process_mrelease, pidfd, flags); 25 26 if (ret < 0) { 27 libc_errno = static_cast<int>(-ret); 28 return -1; 29 } 30 31 return 0; 32 #else 33 // The system call is not available. 34 (void)pidfd; 35 (void)flags; 36 libc_errno = ENOSYS; 37 return -1; 38 #endif 39 } 40 41 } // namespace LIBC_NAMESPACE_DECL 42