49 lines · cpp
1//===-- Linux implementation of sendto ------------------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/sys/socket/sendto.h"10 11#include <linux/net.h> // For SYS_SOCKET socketcall number.12#include <sys/syscall.h> // For syscall numbers.13 14#include "hdr/types/socklen_t.h"15#include "hdr/types/ssize_t.h"16#include "hdr/types/struct_sockaddr.h"17#include "src/__support/OSUtil/syscall.h" // For internal syscall function.18#include "src/__support/common.h"19#include "src/__support/libc_errno.h"20 21namespace LIBC_NAMESPACE_DECL {22 23LLVM_LIBC_FUNCTION(ssize_t, sendto,24 (int sockfd, const void *buf, size_t len, int flags,25 const struct sockaddr *dest_addr, socklen_t addrlen)) {26#ifdef SYS_sendto27 ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(28 SYS_sendto, sockfd, buf, len, flags, dest_addr, addrlen);29#elif defined(SYS_socketcall)30 unsigned long sockcall_args[6] = {static_cast<unsigned long>(sockfd),31 reinterpret_cast<unsigned long>(buf),32 static_cast<unsigned long>(len),33 static_cast<unsigned long>(flags),34 reinterpret_cast<unsigned long>(dest_addr),35 static_cast<unsigned long>(addrlen)};36 ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(37 SYS_socketcall, SYS_SENDTO, sockcall_args);38#else39#error "socket and socketcall syscalls unavailable for this platform."40#endif41 if (ret < 0) {42 libc_errno = static_cast<int>(-ret);43 return -1;44 }45 return ret;46}47 48} // namespace LIBC_NAMESPACE_DECL49