48 lines · cpp
1//===-- Linux implementation of send --------------------------------------===//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/send.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, send,24 (int sockfd, const void *buf, size_t len, int flags)) {25#ifdef SYS_send26 ssize_t ret =27 LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_send, sockfd, buf, len, flags);28#elif defined(SYS_sendto)29 ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_sendto, sockfd, buf,30 len, flags, nullptr, 0);31#elif defined(SYS_socketcall)32 unsigned long sockcall_args[4] = {33 static_cast<unsigned long>(sockfd), reinterpret_cast<unsigned long>(buf),34 static_cast<unsigned long>(len), static_cast<unsigned long>(flags)};35 ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_socketcall, SYS_SEND,36 sockcall_args);37#else38#error "socket and socketcall syscalls unavailable for this platform."39#endif40 if (ret < 0) {41 libc_errno = static_cast<int>(-ret);42 return -1;43 }44 return ret;45}46 47} // namespace LIBC_NAMESPACE_DECL48