ftok(3) BSD Programmer's Manual ftok(3)NAMEftok - create IPC identifier from path name
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(3), 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 fail and return -1 if path does not exist or if
it cannot be accessed by the calling process.
SEE ALSOsemget(2), shmget(2), msgget(2)4th Berkeley Distribution July 3, 1996 1