1 //===-- Linux implementation of socketpair --------------------------------===// 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/socketpair.h" 10 11 #include "src/__support/OSUtil/syscall.h" // For internal syscall function. 12 #include "src/__support/common.h" 13 #include "src/__support/macros/config.h" 14 #include "src/__support/macros/sanitizer.h" 15 #include "src/errno/libc_errno.h" 16 #include <linux/net.h> // For SYS_SOCKET socketcall number. 17 #include <sys/syscall.h> // For syscall numbers. 18 19 namespace LIBC_NAMESPACE_DECL { 20 21 LLVM_LIBC_FUNCTION(int, socketpair, 22 (int domain, int type, int protocol, int sv[2])) { 23 #ifdef SYS_socketpair 24 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_socketpair, domain, type, 25 protocol, sv); 26 #elif defined(SYS_socketcall) 27 unsigned long sockcall_args[3] = { 28 static_cast<unsigned long>(domain), static_cast<unsigned long>(type), 29 static_cast<unsigned long>(protocol), static_cast<unsigned long>(sv)}; 30 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_socketcall, SYS_SOCKETPAIR, 31 sockcall_args); 32 #else 33 #error "socket and socketcall syscalls unavailable for this platform." 34 #endif 35 if (ret < 0) { 36 libc_errno = -ret; 37 return -1; 38 } 39 40 MSAN_UNPOISON(sv, sizeof(int) * 2); 41 42 return ret; 43 } 44 45 } // namespace LIBC_NAMESPACE_DECL 46