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/__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_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

source code of libc/src/sys/socket/linux/sendto.cpp