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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
     semget(2), shmget(2), msgget(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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