github.com/SandwichDev/go-internals@v0.0.0-20210605002614-12311ac6b2c5/syscall/unix/writev_illumos.go (about)

     1  // Copyright 2020 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  // +build illumos
     6  
     7  package unix
     8  
     9  import (
    10  	"syscall"
    11  	"unsafe"
    12  )
    13  
    14  //go:cgo_import_dynamic libc_writev writev "libc.so"
    15  
    16  //go:linkname procwritev libc_writev
    17  
    18  var procwritev uintptr
    19  
    20  func Writev(fd int, iovs []syscall.Iovec) (uintptr, error) {
    21  	var p *syscall.Iovec
    22  	if len(iovs) > 0 {
    23  		p = &iovs[0]
    24  	}
    25  	n, _, errno := syscall6(uintptr(unsafe.Pointer(&procwritev)), 3, uintptr(fd), uintptr(unsafe.Pointer(p)), uintptr(len(iovs)), 0, 0, 0)
    26  	if errno != 0 {
    27  		return 0, errno
    28  	}
    29  	return n, nil
    30  }