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REVOKE(2) BSD System Calls Manual REVOKE(2) NAME revoke -- revoke file access 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operations on any such descriptors fail, with the exceptions that a read() from a character device file which has been revoked returns a count of zero (end of file), and a close() call will succeed.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 function is currently supported only for block and character spe-cial special cial 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 ter-minal. terminal. minal. RETURN VALUES A 0 value indicated that the call succeeded. A -1 return value indicates an error occurred and errno is set to indicated 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 exist. [EACCES] Search permission is denied for a component of the path prefix. [ELOOP] Too many symbolic links were encountered in translat-ing translating ing the pathname. [EFAULT] Path points outside the process's allocated address space. [EINVAL] The named file is neither a character special or block special file. [EPERM] The caller is neither the owner of the file nor the super user. SEE ALSO close(2) HISTORY The revoke function was introduced in 4.3BSD-Reno. BSD June 4, 1993 BSD |