gitee.com/ks-custle/core-gm@v0.0.0-20230922171213-b83bdd97b62c/net/internal/socket/complete_dontwait.go (about)

     1  // Copyright 2021 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  //go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
     6  // +build darwin dragonfly freebsd linux netbsd openbsd solaris
     7  
     8  package socket
     9  
    10  import (
    11  	"syscall"
    12  )
    13  
    14  // ioComplete checks the flags and result of a syscall, to be used as return
    15  // value in a syscall.RawConn.Read or Write callback.
    16  func ioComplete(flags int, operr error) bool {
    17  	if flags&syscall.MSG_DONTWAIT != 0 {
    18  		// Caller explicitly said don't wait, so always return immediately.
    19  		return true
    20  	}
    21  	if operr == syscall.EAGAIN || operr == syscall.EWOULDBLOCK {
    22  		// No data available, block for I/O and try again.
    23  		return false
    24  	}
    25  	return true
    26  }