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UNIX for Dummies Questions & Answers
Dleting a Device in AIX 4.3
Post 1010 by Neo on Friday 2nd of February 2001 02:26:37 PM
02-02-2001
Administrator
The 'device in use' error comes from the fact that there is a process running which has an open/active file descriptor associated with the device. You must determine the process(es) which is(are) associated with the device and kill it(them).
If the device is a tty then you have to determine which tty is in use (mouse, modems, console, logins, etc) and make sure when you kill the process that you are not killing the shell you are working in. For example, if you are at a console and logged in to the system, you cannot kill that tty. If you do, you will be kicked off, because your shell process (associated with the tty) will die.
Enjoy the detective work! It not too hard of a detective-problem and should be rewarding finding out which TTYs are associated with what process
If the device is a tty then you have to determine which tty is in use (mouse, modems, console, logins, etc) and make sure when you kill the process that you are not killing the shell you are working in. For example, if you are at a console and logged in to the system, you cannot kill that tty. If you do, you will be kicked off, because your shell process (associated with the tty) will die.
Enjoy the detective work! It not too hard of a detective-problem and should be rewarding finding out which TTYs are associated with what process
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LEARN ABOUT PLAN9
pam_securetty
PAM_SECURETTY(8) Linux-PAM Manual PAM_SECURETTY(8) NAME
pam_securetty - Limit root login to special devices SYNOPSIS
pam_securetty.so [debug] DESCRIPTION
pam_securetty is a PAM module that allows root logins only if the user is logging in on a "secure" tty, as defined by the listing in /etc/securetty. pam_securetty also checks to make sure that /etc/securetty is a plain file and not world writable. It will also allow root logins on the tty specified with console= switch on the kernel command line and on ttys from the /sys/class/tty/console/active. This module has no effect on non-root users and requires that the application fills in the PAM_TTY item correctly. For canonical usage, should be listed as a required authentication method before any sufficient authentication methods. OPTIONS
debug Print debug information. noconsole Do not automatically allow root logins on the kernel console device, as specified on the kernel command line or by the sys file, if it is not also specified in the /etc/securetty file. MODULE TYPES PROVIDED
Only the auth module type is provided. RETURN VALUES
PAM_SUCCESS The user is allowed to continue authentication. Either the user is not root, or the root user is trying to log in on an acceptable device. PAM_AUTH_ERR Authentication is rejected. Either root is attempting to log in via an unacceptable device, or the /etc/securetty file is world writable or not a normal file. PAM_INCOMPLETE An application error occurred. pam_securetty was not able to get information it required from the application that called it. PAM_SERVICE_ERR An error occurred while the module was determining the user's name or tty, or the module could not open /etc/securetty. PAM_USER_UNKNOWN The module could not find the user name in the /etc/passwd file to verify whether the user had a UID of 0. Therefore, the results of running this module are ignored. EXAMPLES
auth required pam_securetty.so auth required pam_unix.so SEE ALSO
securetty(5), pam.conf(5), pam.d(5), pam(7) AUTHOR
pam_securetty was written by Elliot Lee <sopwith@cuc.edu>. Linux-PAM Manual 09/19/2013 PAM_SECURETTY(8)