ftok man page on FreeBSD

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

     ftok — create IPC identifier from path name

     Standard C Library (libc, -lc)

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

     ftok(const char *path, int id);

     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.

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

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

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

     Thorsten Lockert ⟨tholo@sigmasoft.com⟩

     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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