On Mon, 2004-08-16 at 17:34, Clint Fairchild wrote:
> Is there a simple solution to access syslog with C#? I'm attempting to
> write a daemon.
The answer should be System.Diagnostics.EventLog. Alas, it isn't,
because no one has implemented a shim to make syslog look like a Windows
Event Log yet. Sorry, it hasn't been a priority.
You'll have to P/Invoke syslog(3) directly. Lucky you, I wrote a short
demo of "Hello, world" for syslog(3). Unlucky you, I was lazy and used
the constant values in /usr/include/sys/syslog.h on Fedora Core 2. This
should be good for Linux systems, but the constants will have different
values on other Unix platforms, so a "real" solution would mimic
Mono.Posix.
// syslog example:
using System;
using System.Runtime.InteropServices;
class Syslog_h {
[Flags]
public enum Option {
Pid = 0x01,
Console = 0x02,
Delay = 0x04,
NoDelay = 0x08,
NoWait = 0x10,
PrintError = 0x20
}
[Flags]
public enum Facility {
Kernel = 0 << 3,
User = 1 << 3,
Mail = 2 << 3,
Daemon = 3 << 3,
Auth = 4 << 3,
Syslog = 5 << 3,
Lpr = 6 << 3,
News = 7 << 3,
Uucp = 8 << 3,
Cron = 8 << 3,
AuthPriv = 10 << 3,
Ftp = 11 << 3,
Local0 = 16 << 3,
Local1 = 17 << 3,
Local2 = 18 << 3,
Local3 = 19 << 3,
Local4 = 20 << 3,
Local5 = 21 << 3,
Local6 = 22 << 3,
Local7 = 23 << 3,
}
[Flags]
public enum Level {
Emerg = 0,
Alert = 1,
Crit = 2,
Err = 3,
Warning = 4,
Notice = 5,
Info = 6,
Debug = 7
}
// Note that `ident' is an IntPtr, not a string;
// see Demo.Main() for why
[DllImport ("libc")]
public static extern void openlog (IntPtr ident,
Option option, Facility facility);
[DllImport ("libc")]
public static extern void syslog (int priority,
string message);
[DllImport ("libc")]
public static extern void closelog ();
}
class Demo {
public static void Main (string[] args)
{
// Ident needs to be an IntPtr, not a string,
// as syslog doesn't copy the string; it
// assumes that the string won't change.
// Since strings are garbage collected, the
// string will eventually be collected, causing
// syslog(3) to print garbage for the ident
// unless we make sure `ident' is allocated in
// unmanaged memory:
IntPtr ident = Marshal.StringToHGlobalAnsi (
"this is my ident");
Syslog_h.openlog (ident,
Syslog_h.Option.Console | Syslog_h.Option.Pid |
Syslog_h.Option.PrintError,
Syslog_h.Facility.User);
Syslog_h.syslog ((int) Syslog_h.Facility.User |
(int) Syslog_h.Level.Debug,
"Hello, syslog!");
Syslog_h.closelog ();
Marshal.FreeHGlobal (ident);
}
}
- Jon
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