ftok man page on OpenBSD

Man page or keyword search:  
man Server   11362 pages
apropos Keyword Search (all sections)
Output format
OpenBSD logo
[printable version]

FTOK(3)			  OpenBSD Programmer's Manual		       FTOK(3)

NAME
     ftok - create IPC identifier from a pathname

SYNOPSIS
     #include <sys/types.h>
     #include <sys/ipc.h>

     key_t
     ftok(const char *path, int id);

DESCRIPTION
     The ftok() function attempts to create a unique key suitable for use with
     the msgget(2), semget(2) and shmget(2) functions given the path of an
     existing file and a user-selectable id.

     The specified path must refer to an existing file that is accessible to
     the calling process or the call will fail.	 Also, note that links to
     files will return the same key, given the same id.	 Only the 8 least
     significant bits of id are used in the key generation; the rest of the
     bits are ignored.

RETURN VALUES
     The ftok() function will return (key_t)-1 if path does not exist or if it
     cannot be accessed by the calling process.

SEE ALSO
     msgget(2), semget(2), shmget(2)

HISTORY
     The ftok() function originated with System V and is typically used by
     programs that use the System V IPC routines.

AUTHORS
     Thorsten Lockert <tholo@sigmasoft.com>

BUGS
     The returned key is computed based on the device and inode of the
     specified path in combination with the given id.  Thus it is quite
     possible for the routine to return duplicate keys given that those fields
     are not 8- and 16-bit quantities like they were on System V based systems
     where this library routine's ancestors were originally created.

OpenBSD 4.9			 May 31, 2007			   OpenBSD 4.9
[top]

List of man pages available for OpenBSD

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net