sock_cloexec_solaris.go

     1  // Copyright 2024 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // This file implements sysSocket for platforms that provide a fast path for
     6  // setting SetNonblock and CloseOnExec, but don't necessarily support it.
     7  // Support for SOCK_* flags as part of the type parameter was added to Oracle
     8  // Solaris in the 11.4 release. Thus, on releases prior to 11.4, we fall back
     9  // to the combination of socket(3c) and fcntl(2).
    10  
    11  package net
    12  
    13  import (
    14  	"internal/poll"
    15  	"internal/syscall/unix"
    16  	"os"
    17  	"syscall"
    18  )
    19  
    20  // Wrapper around the socket system call that marks the returned file
    21  // descriptor as nonblocking and close-on-exec.
    22  func sysSocket(family, sotype, proto int) (int, error) {
    23  	// Perform a cheap test and try the fast path first.
    24  	if unix.SupportSockNonblockCloexec() {
    25  		s, err := socketFunc(family, sotype|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, proto)
    26  		if err != nil {
    27  			return -1, os.NewSyscallError("socket", err)
    28  		}
    29  		return s, nil
    30  	}
    31  
    32  	// See ../syscall/exec_unix.go for description of ForkLock.
    33  	syscall.ForkLock.RLock()
    34  	s, err := socketFunc(family, sotype, proto)
    35  	if err == nil {
    36  		syscall.CloseOnExec(s)
    37  	}
    38  	syscall.ForkLock.RUnlock()
    39  	if err != nil {
    40  		return -1, os.NewSyscallError("socket", err)
    41  	}
    42  	if err = syscall.SetNonblock(s, true); err != nil {
    43  		poll.CloseFunc(s)
    44  		return -1, os.NewSyscallError("setnonblock", err)
    45  	}
    46  	return s, nil
    47  }
    48
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