FTOK(3) | Library Functions Manual | FTOK(3) |
ftok
—
#include <sys/types.h>
#include <sys/ipc.h>
key_t
ftok
(const
char *path, int
id);
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.
Only the 8 least significant bits of id are used in the key generation; the rest of the bits are ignored.
ftok
() function will return ((key_t)-1) if
path does not exist or if it cannot be accessed by the
calling process.
ftok
() function conforms to IEEE
Std 1003.1 (“POSIX.1”).
ftok
() function originated with System V and is
typically used by programs that use the System V IPC routines.
April 27, 2010 | NetBSD 9.2 |