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revoke(2) [freebsd man page]

REVOKE(2)						      BSD System Calls 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() 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operations on any such descriptors fail, with the exceptions that a read() from a character device file which has been revoked returns a count of zero (end of file), and a close() system call will succeed.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 previ- ous user of the terminal. RETURN VALUES
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. 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 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 super user. SEE ALSO
revoke(1), close(2) HISTORY
The revoke() system call first appeared in 4.3BSD-Reno. BSD
June 4, 1993 BSD

Check Out this Related Man Page

SWAPON(3)						   BSD Library Functions Manual 						 SWAPON(3)

NAME
swapon -- add a swap device for interleaved paging/swapping SYNOPSIS
#include <unistd.h> int swapon(const char *special); DESCRIPTION
This interface is provided for compatibility only and has been obsoleted by swapctl(2). swapon() makes the block device special available to the system for allocation for paging and swapping. The names of potentially available devices are known to the system and defined at system configuration time. The size of the swap area on special is calculated at the time the device is first made available for swapping. RETURN VALUES
If an error has occurred, a value of -1 is returned and errno is set to indicate the error. ERRORS
swapon() succeeds unless: [ENOTDIR] A component of the path prefix is not a directory. [ENAMETOOLONG] A component of a pathname exceeded {NAME_MAX} characters, or an entire path name exceeded {PATH_MAX} characters. [ENOENT] The named device 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. [EPERM] The caller is not the super-user. [ENOTBLK] special is not a block device. [EBUSY] The device specified by special has already been made available for swapping [EINVAL] The device configured by special was not configured into the system as a swap device. [ENXIO] The major device number of special is out of range (this indicates no device driver exists for the associated hardware). [EIO] An I/O error occurred while opening the swap device. [EFAULT] special points outside the process's allocated address space. SEE ALSO
swapctl(2), swapctl(8), swapon(8) HISTORY
The swapon() function call appeared in 4.0BSD and was removed NetBSD 1.3 BUGS
This call will be upgraded in future versions of the system. BSD
June 4, 1993 BSD

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