revoke(2)
- NetBSD Manual Pages
REVOKE(2) NetBSD Programmer's Manual REVOKE(2)
NAME
revoke - revoke file access
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
revoke(const char *path);
DESCRIPTION
The revoke function invalidates all current open file descriptors in the
system for the file named by path. Subsequent operations on any such de-
scriptors fail, with the exceptions that a read() from a character device
file which has been revoked returns a count of zero (end of file), and a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 refer-
ences to the file had been closed.
Access to a file may be revoked only by its owner or the super user.
revoke is normally used to prepare a terminal device for a new login ses-
sion, preventing any access by a previous user of the terminal.
RETURN VALUES
A 0 value indicates that the call succeeded. A -1 return value indicates
an error occurred and errno is set to indicate the reason.
ERRORS
Access to the named file is revoked unless one of the following:
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG]
A component of a pathname exceeded 255 characters, or an
entire path name exceeded 1024 characters.
[ENOENT] The named file or a component of the path name does not ex-
ist.
[EACCES] Search permission is denied for a component of the path
prefix.
[ELOOP] Too many symbolic links were encountered in translating the
pathname.
[EFAULT] path points outside the process's allocated address space.
[EPERM] The caller is neither the owner of the file nor the super
user.
SEE ALSO
close(2), dup(2), fcntl(2), flock(2), fstat(2), read(2), write(2)
HISTORY
The revoke function was introduced in 4.3BSD-Reno.
NetBSD 1.5 March 22, 1999 1
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