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-exception 6 // 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/errno/libc_errno.h" 20 21 namespace LIBC_NAMESPACE_DECL { 22 23 LLVM_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_sendto 27 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 #else 39 #error "socket and socketcall syscalls unavailable for this platform." 40 #endif 41 if (ret < 0) { 42 libc_errno = static_cast<int>(-ret); 43 return -1; 44 } 45 return ret; 46 } 47 48 } // namespace LIBC_NAMESPACE_DECL 49