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//
// Copyright 2014-2023 Cristian Maglie. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//
//go:build linux || darwin || freebsd || openbsd
package unixutils
import (
"fmt"
"syscall"
)
// Pipe represents a unix-pipe
type Pipe struct {
opened bool
rd int
wr int
}
// Open creates a new pipe
func (p *Pipe) Open() error {
fds := []int{0, 0}
if err := syscall.Pipe(fds); err != nil {
return err
}
p.rd = fds[0]
p.wr = fds[1]
p.opened = true
return nil
}
// ReadFD returns the file handle for the read side of the pipe.
func (p *Pipe) ReadFD() int {
if !p.opened {
return -1
}
return p.rd
}
// WriteFD returns the flie handle for the write side of the pipe.
func (p *Pipe) WriteFD() int {
if !p.opened {
return -1
}
return p.wr
}
// Write to the pipe the content of data. Returns the numbre of bytes written.
func (p *Pipe) Write(data []byte) (int, error) {
if !p.opened {
return 0, fmt.Errorf("Pipe not opened")
}
return syscall.Write(p.wr, data)
}
// Read from the pipe into the data array. Returns the number of bytes read.
func (p *Pipe) Read(data []byte) (int, error) {
if !p.opened {
return 0, fmt.Errorf("Pipe not opened")
}
return syscall.Read(p.rd, data)
}
// Close the pipe
func (p *Pipe) Close() error {
if !p.opened {
return fmt.Errorf("Pipe not opened")
}
err1 := syscall.Close(p.rd)
err2 := syscall.Close(p.wr)
p.opened = false
if err1 != nil {
return err1
}
if err2 != nil {
return err2
}
return nil
}
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