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REVOKE(2)                DragonFly System Calls Manual               REVOKE(2)


revoke -- revoke file access


Standard C Library (libc, -lc)


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


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operations on any such descriptors fail, with the exceptions that a read() from a character device file which has been revoked returns a count of zero (end of file), and a close() call will succeed.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. Root, jail root, and chrooted directories cannot be revoked. It is normally used to prepare a terminal device for a new login session, preventing any access by a previous user of the terminal.


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 error.


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 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.




The revoke() function was introduced in 4.3BSD-Reno. DragonFly 4.3 November 4, 2015 DragonFly 4.3

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