types(5)
NAME
types − primitive system data types
SYNOPSIS
#include <sys/types.h>
REMARKS
The example given on this page is a typical version; the type names are in general expected to be present, although exceptions can 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.
DESCRIPTION
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.
DEPENDENCIES
HP Clustered Environment
The following additional type is defined:
typedef ushort cnode_t;
cnode_t is the cnode ID of a machine in a cluster.
SEE ALSO
STANDARDS CONFORMANCE
<sys/types.h>: AES, XPG2, XPG3, XPG4, FIPS 151-2, POSIX.1
Hewlett-Packard Company — HP-UX Release 9.0: August 1992