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REVOKE(2) System Calls Manual REVOKE(2)

revoke
revoke file access

#include <unistd.h>
int
revoke(const char *path);

The revoke() function invalidates all current open file descriptors in the system for the tty device named by path. Subsequent operations on any such descriptors fail, with the exceptions that a read() from a tty which has been revoked returns a count of zero (end of file), and a close() call will succeed. If the file is a special file for a device which is open, the device close function is called as if all open references to the file had been closed.
Access to a file may be revoked only by its owner or the superuser. The revoke() function is used to prepare a terminal device for a new login session, preventing any access by a previous user of the terminal. The pty(4) subsystem has this as an implicit operation, but hardwired tty(4) require the operation.

Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

Access to the named file is revoked unless one of the following:
 
 
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A component of the path prefix is not a directory.
 
 
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A component of a pathname exceeded NAME_MAX characters, or an entire pathname (including the terminating NUL) exceeded PATH_MAX bytes.
 
 
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The named file or a component of the path name does not exist.
 
 
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path is not associated with a tty special device.
 
 
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Search permission is denied for a component of the path prefix.
 
 
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Too many symbolic links were encountered in translating the pathname.
 
 
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path points outside the process's allocated address space.
 
 
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The caller is neither the owner of the file nor the superuser.

close(2)

The revoke() function was introduced in 4.3BSD-Reno.
November 16, 2015 OpenBSD-current