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Date: Thu, 19 Jul 2007 23:23:45 -0400
From: "Michael B Allen" <ioplex@gmail.com>
To: freebsd-hackers <freebsd-hackers@freebsd.org>
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	<78c6bd860707191900g375f98ado8315603feac50247@mail.gmail.com>
Subject: Re: Path to executable of current process?
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> Is there any way to get argv[0] for [a particular] process without being root?

After more digging I see sysctl seems to be the way to do this but can I get
the full path to the executable form kinfo_proc?

How does ps do this?

static const char *
getcmdline(pid_t pid)
{
    static struct kinfo_proc ki_proc;
    int mib[4], len;

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

    len = sizeof(struct kinfo_proc);
    if (sysctl(mib, 4, &ki_proc, &len, NULL, 0) == -1)
        return NULL;

    return ki_proc.ki_???
}

Mike