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-exception 6 // 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/errno/libc_errno.h" 20 21 namespace LIBC_NAMESPACE_DECL { 22 23 LLVM_LIBC_FUNCTION(ssize_t, send, 24 (int sockfd, const void *buf, size_t len, int flags)) { 25 #ifdef SYS_send 26 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 #else 38 #error "socket and socketcall syscalls unavailable for this platform." 39 #endif 40 if (ret < 0) { 41 libc_errno = static_cast<int>(-ret); 42 return -1; 43 } 44 return ret; 45 } 46 47 } // namespace LIBC_NAMESPACE_DECL 48