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FTOK(3) Library Functions Manual FTOK(3) NAME ftok -- create IPC identifier from path name LIBRARY Standard C Library (libc, -lc) SYNOPSIS #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 ex- isting 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 msgget(2), semget(2), shmget(2) HISTORY The ftok() function originates with System V and is typically used by pro- grams 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. FreeBSD ports 15.1 November 28, 2022 FTOK(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | HISTORY | AUTHORS | BUGS
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