HP-UX Reference (11i v1 05/09) - 5 Miscellaneous Topics (vol 9)

t
types(5) types(5)
NAME
types - primitive system data types
SYNOPSIS
#include <sys/types.h>
DESCRIPTION
REMARKS
The example given on this page is a typical version. The type names are in general expected to be present,
although exceptions (if any) may be described in
DEPENDENCIES. In most cases the fundamental type
which implements each typedef is implementation dependent as long as source code which uses those
typedefs need not be changed. In some cases the typedef is actually a shorthand for a commonly used type,
and will not vary.
The data types defined in the include file are used in
HP-UX system code; some data of these types are
accessible to user code:
typedef struct { int r[1]; } ∗physadr;
typedef long daddr_t;
typedef char ∗caddr_t;
typedef unsigned int uint;
typedef unsigned short ushort;
typedef ushort ino_t;
typedef short cnt_t;
typedef long time_t;
typedef long dev_t;
typedef long off_t;
typedef long paddr_t;
typedef long key_t;
typedef short pid_t;
typedef long uid_t;
typedef long gid_t;
Note that the defined names above are standardized, but the actual type to which they are defined may
vary between
HP-UX implementations.
The meanings of the types are:
physadr used as a pointer to memory; the pointer is aligned to follow hardware-dependent
instruction addressing conventions.
daddr_t used for disk addresses except in an inode on disk, see fs(4).
caddr_t used as an untyped pointer or a pointer to untyped memory.
uint shorthand for unsigned integer.
ushort shorthand for unsigned short.
ino_t used to specify I-numbers.
cnt_t used in some implementations to hold reference counts for some kernel data structures.
time_t time encoded in seconds since 00:00:00
GMT, January 1, 1970.
dev_t specifies kind and unit number of a device, encoded in two parts known as major and
minor.
off_t offsets measured in bytes from the beginning of a file.
paddr_t used as an integer type which is properly sized to hold a pointer.
key_t the type of a key used to obtain a message queue, semaphore, or shared memory
identifier, see stdipc(3C).
pid_t used to specify process and process group identifiers.
uid_t used to specify user identifiers.
gid_t user to specify group identifiers.
HP-UX 11i Version 1: September 2005 − 1 − Hewlett-Packard Company Section 5−−375