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FreeBSD 11.0 - man page for ftok (freebsd section 3)

FTOK(3) 						   BSD Library Functions Manual 						   FTOK(3)

NAME
ftok -- create IPC identifier from path name
LIBRARY
Standard C Library (libc, -lc)
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 specify 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.
RETURN VALUES
The ftok() function will return -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 originates 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 minor number and inode of the specified path in combination with the lower 8 bits of the given id. Thus it is quite possible for the routine to return duplicate keys.
BSD
July 9, 2009 BSD

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