types(5)                                                           types(5)




 NAME    [Toc]    [Back]
      types - primitive system data types

 SYNOPSIS    [Toc]    [Back]
      #include <sys/types.h>

 DESCRIPTION    [Toc]    [Back]
    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 char                  *caddr_t;
           typedef unsigned int          uint;
           typedef unsigned short        ushort;
           typedef unsigned long         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 int32_t               pid_t;
           typedef long                  uid_t;
           typedef long                  gid_t;
           typedef long                  blkcnt_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.

           caddr_t     used as an untyped pointer or a pointer to untyped
                       memory.

           uint        shorthand for unsigned integer.

           ushort      shorthand for unsigned short.




 Hewlett-Packard Company            - 1 -   HP-UX 11i Version 2: August 2003






 types(5)                                                           types(5)




           ino_t       used to specify I-numbers.  All native file systems
                       (including HFS and VxFS 3.5) through HP-UX 11i, use
                       values that will fit within 32-bits.  Some remote NFS
                       servers may use larger values, which will be
                       truncated without error for 32-bit applications and
                       may not result in unique values.

           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       offset measured in bytes from the beginning of a
                       file.  If a 32-bit application is compiled with
                       -D_FILE_OFFSET_BITS=64 or -D_LARGEFILE64_SOURCE,
                       off_t will become an int64_t.

           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.

           blkcnt_t    disk quota or transfer size measured in blocks.  If a
                       32-bit application is compiled with
                       -D_FILE_OFFSET_BITS=64 or -D_LARGEFILE64_SOURCE,
                       blkcnt_t will become an int64_t.

 STANDARDS CONFORMANCE    [Toc]    [Back]
      <sys/types.h>: AES, SVID3, XPG2, XPG3, XPG4, FIPS 151-2, POSIX.1


 Hewlett-Packard Company            - 2 -   HP-UX 11i Version 2: August 2003