1 //===-- LibcGlue.cpp --------------------------------------------*- C++ -*-===// 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 // This file adds functions missing from libc on older versions of linux 10 11 #include <cerrno> 12 #include <lldb/Host/linux/Uio.h> 13 #include <sys/syscall.h> 14 #include <unistd.h> 15 16 #if !HAVE_PROCESS_VM_READV 17 // If the syscall wrapper is not available, provide one. 18 ssize_t process_vm_readv(::pid_t pid, const struct iovec *local_iov, 19 unsigned long liovcnt, const struct iovec *remote_iov, 20 unsigned long riovcnt, unsigned long flags) { 21 #if HAVE_NR_PROCESS_VM_READV 22 // If we have the syscall number, we can issue the syscall ourselves. 23 return syscall(__NR_process_vm_readv, pid, local_iov, liovcnt, remote_iov, 24 riovcnt, flags); 25 #else // If not, let's pretend the syscall is not present. 26 errno = ENOSYS; 27 return -1; 28 #endif 29 } 30 #endif 31