ftok(3) Library Functions Manual ftok(3) ftok - IPC System V (libc -lc) #include key_t ftok(const char *path, int proj_id); ftok() path ( ) 8 proj_id ( ) IPC key_t System V msgget(2) semget(2) shmget(2). proj_id. ( ) . key_t. -1 errno stat(2). attributes(7). +------------+------------------------------------+--------------------+ || | | +------------+------------------------------------+--------------------+ |ftok() | | MT-Safe | +------------+------------------------------------+--------------------+ POSIX.1-2008. POSIX.1-2001. : key_t ftok(char *path, char proj_id); proj_id int 8 . ASCII proj_id proj_id . key_t . proj_id 16 inode 8 32 . /dev/hda1 /dev/sda1. semget(2). msgget(2), semget(2), shmget(2), stat(2), sysvipc(7) 3 . . : . 6.18 8 2026 ftok(3)