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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2018 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package systemd
import (
"bytes"
"fmt"
"log/syslog"
"net"
"os"
)
var journalStdoutPath = "/run/systemd/journal/stdout"
// NewJournalStreamFile creates log stream file descriptor to the journal. The
// semantics is identical to that of sd_journal_stream_fd(3) call.
func NewJournalStreamFile(identifier string, priority syslog.Priority, levelPrefix bool) (*os.File, error) {
conn, err := net.DialUnix("unix", nil, &net.UnixAddr{Name: journalStdoutPath})
if err != nil {
return nil, err
}
// does not affect *os.File created through conn.File() later on
defer conn.Close()
if err := conn.CloseRead(); err != nil {
return nil, err
}
// header contents taken from the original systemd code:
// https://github.com/systemd/systemd/blob/97a33b126c845327a3a19d6e66f05684823868fb/src/journal/journal-send.c#L395
header := bytes.Buffer{}
header.WriteString(identifier)
header.WriteByte('\n')
header.WriteByte('\n')
header.WriteByte(byte('0') + byte(priority))
header.WriteByte('\n')
var prefix int
if levelPrefix {
prefix = 1
}
header.WriteByte(byte('0') + byte(prefix))
header.WriteByte('\n')
header.WriteByte('0')
header.WriteByte('\n')
header.WriteByte('0')
header.WriteByte('\n')
header.WriteByte('0')
header.WriteByte('\n')
if _, err := conn.Write(header.Bytes()); err != nil {
return nil, fmt.Errorf("failed to write header: %v", err)
}
return conn.File()
}
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