not able to get controlling tty

[Rajesh Ghanekar]

Hi,

   I have a program which prints the name of the controlling terminal. The 
code snippet is as
follows:

int main(int argc, char **argv)
{
        int mib[4], len;
        struct kinfo_proc buf;
        udev_t ttydev;
        register struct dirent *dirp;
        register DIR *dp;
        struct stat dsb;
        char namebuf[sizeof(PATH_DEV) + MAXNAMLEN];

        mib[0] = CTL_KERN;
        mib[1] = KERN_PROC;
        mib[2] = KERN_PROC_PID;
        mib[3] = getpid();
        len = sizeof (buf);
        sysctl(mib, 4, &buf, &len, NULL, 0);
        ttydev = buf.kp_eproc.e_tdev;
        printf("ttydev is %u, major = %d, minor = %d\n", ttydev, 
major(ttydev), minor(ttydev));

        if (!(dp = opendir(PATH_DEV)))
                return 1;
        strlcpy(namebuf, PATH_DEV, sizeof(PATH_DEV));
        while ((dirp = readdir(dp))) {
                memset(namebuf + sizeof(PATH_DEV) - 1, '\0',
                        MAXNAMLEN - sizeof(PATH_DEV) + 1);
                memcpy(namebuf + sizeof(PATH_DEV) - 1, dirp->d_name,
                    dirp->d_namlen + 1);
                if (stat(namebuf, &dsb) || (dsb.st_rdev != ttydev))
                        continue;
                printf("OK found\n");
                break;
        }
}

The value returned by buf.kp_eproc.e_tdev doesn't seems to be right.

#/tmp/abc
ttydev is 30479, major = 119, minor = 15
Device name is /dev/log
# /tmp/abc
ttydev is 30577, major = 119, minor = 113
Device name is /dev/log

ttydev keeps on changing every time I run same program on same terminal.
Is there any way to get terminal device (udev_t) from struct kinfo_proc?


- Rajesh

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