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revoke — revoke file access
Standard C Library (libc, -lc)
revoke(const char *path);
The revoke() system call invalidates all current open file descriptors in
the system for the file named by path. Subsequent operations on any such
descriptors 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device file which has been revoked returns a count of zero (end of file),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() system 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 super user. The
revoke() system call is currently supported only for block and character
special device files. It is normally used to prepare a terminal device
for a new login session, preventing any access by a previous user of the
The revoke() function returns the value 0 if successful; otherwise the
value -1 is returned and the global variable errno is set to indicate the
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
[EACCES] Search permission is denied for a component of the
[ELOOP] Too many symbolic links were encountered in
translating the pathname.
[EFAULT] The path argument points outside the process's
allocated address space.
[EINVAL] The implementation does not support the revoke()
operation on the named file.
[EPERM] The caller is neither the owner of the file nor the
The revoke() system call first appeared in 4.3BSD-Reno.