// Copyright 2013 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // This file implements sysSocket for platforms that provide a fast path for // setting SetNonblock and CloseOnExec. //go:build dragonfly || freebsd || linux || netbsd || openbsd || solaris package net import ( "internal/poll" "os" "syscall" ) // Wrapper around the socket system call that marks the returned file // descriptor as nonblocking and close-on-exec. func sysSocket(family, sotype, proto int) (int, error) { s, err := socketFunc(family, sotype|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, proto) // TODO: We can remove the fallback on Linux and *BSD, // as currently supported versions all support accept4 // with SOCK_CLOEXEC, but Solaris does not. See issue #59359. switch err { case nil: return s, nil default: return -1, os.NewSyscallError("socket", err) case syscall.EPROTONOSUPPORT, syscall.EINVAL: } // See ../syscall/exec_unix.go for description of ForkLock. syscall.ForkLock.RLock() s, err = socketFunc(family, sotype, proto) if err == nil { syscall.CloseOnExec(s) } syscall.ForkLock.RUnlock() if err != nil { return -1, os.NewSyscallError("socket", err) } if err = syscall.SetNonblock(s, true); err != nil { poll.CloseFunc(s) return -1, os.NewSyscallError("setnonblock", err) } return s, nil }