Re: udev - TODO update

[Robert Love <rml@tech9.net>]

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On Thu, 2004-02-26 at 20:27, Robert Love wrote:
> On Thu, 2004-02-26 at 20:00, Greg KH wrote:
> 
> > And how does a program determine the "current local user"?
> 
> utmp.

Here is an example.  Just stick this code where we do the chmod(), and
invoke it if the user is $local or whatever.

The purpose being we want certain devices to be owned by the local
user.  Obviously we also need to do some stuff on login/logout, but
consolehelper will do that for us.

	Robert Love


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/*
 * detect the local user
 *
 * rml@ximian.com
 */

#include <stdio.h>
#include <string.h>
#include <utmp.h>

int main()
{
	struct utmp *u;
	char user[UT_NAMESIZE] = "root";
	time_t recent = 0;

	setutent();

	while ((u = getutent())) {
		/* is this a user login ? */
		if (u->ut_type != USER_PROCESS)
			continue;

		/* XXX: should probably check if the pid is stale */

		/* is this a local login ? */
		if (strcmp(u->ut_host, ""))
			continue;

		if (u->ut_time > recent) {
			recent = u->ut_time;
			strcpy(user, u->ut_user);
		}
	}

	endutent();

	printf("%s\n", user);

	return 0;
}