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Re: logout and auto-login

On Sunday, December 9, 2001, at 11:51 am, Jake wrote:

It is a security application. If it detects an anomaly, it is to terminate
the current session and logout the user "gracefully by force". It appears
that killing either the "loginwindow" or "WindowServer" does the job. But
I can't seem to be able to get the pid of those process from within my
program without resorting to a shell scripts: getpgrp() doesn't yet exist
in OSX, and I can't walk the process table because of permission issues.
(ps is suid). Any suggestions?

You can walk the process table programmatically. I used this code to check if a pid is running, you could probably adapt it (man 3 sysctl for more info) to check for a process by name:

BOOL isPidRunning(int pid) {
int mib[4];
size_t len;
struct kinfo_proc *p;
int nentries;
BOOL isRunning;

mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_PID;
mib[3] = pid;

if (sysctl(mib, 4, NULL, &len, NULL, 0) < 0) { NSLog(@"Error calling sysctl"); return NO; }
p = (struct kinfo_proc *)malloc(len);
if (sysctl(mib, 4, p, &len, NULL, 0) < 0) { NSLog(@"Error calling sysctl"); return NO; }

nentries = len / sizeof(struct kinfo_proc);

if (nentries > 0) {
isRunning = YES;
} else {
isRunning = NO;
}

free(p);
return isRunning;
}

as with autologin, the password is does NOT appear to be stored anywhere,
no?

of course not. that would be silly, considering everybody can read the netinfo db.

-- Finlay

References: 
 >Re: logout and auto-login (From: Jake <email@hidden>)



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