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/__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_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

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