TYPES.H(3HEAD) Headers TYPES.H(3HEAD)

types.h, types - primitive system data types

#include <sys/types.h>

The data types defined in <sys/types.h> are as follows:

The data types listed below are defined in <sys/types.h> for 32-bit illumos.


typedef    struct    { int r[1]; } *physadr;
typedef    long              clock_t;
typedef    long              daddr_t;
typedef    char *            caddr_t;
typedef    unsigned char     unchar;
typedef    unsigned short    ushort;
typedef    unsigned int      uint;
typedef    unsigned long     ulong_t;
typedef    unsigned long     ino_t;
typedef    long              uid_t;
typedef    long              gid_t;
typedef    ulong_t           nlink_t;
typedef    ulong_t           mode_t;
typedef    short             cnt_t;
typedef    long              time_t;
typedef    int               label_t[10];
typedef    ulong_t           dev_t;
typedef    long              off_t;
typedef    long              pid_t;
typedef    long              paddr_t;
typedef    int               key_t;
typedef    unsigned char     use_t;
typedef    short             sysid_t;
typedef    short             index_t;
typedef    short             lock_t;
typedef    unsigned int      size_t;
typedef    long              clock_t;
typedef    long              pid_t;

Several of the above types are altered by the 32-bit large file compilation environment; see the lfcompile(7) man page for additional information on that environment.

The data types listed below are defined in <sys/types.h> for 64-bit illumos.


typedef     long        blkcnt_t
typedef     long        clock_t
typedef     long        daddr_t
typedef     ulong_t     dev_t
typedef     ulong_t     fsblkcnt_t
typedef     ulong_t     fsfilcnt_t
typedef     int         gid_t
typedef     int         id_t
typedef     ulong_t     ino_t
typedef     int         key_t
typedef     uint_t      major_t
typedef     uint_t      minor_t
typedef     uint_t      mode_t
typedef     uint_t      nlink_t
typedef     int         pid_t
typedef     ptrdiff_t   intptr_t
typedef     ulong_t     rlim_t
typedef     ulong_t     size_t
typedef     uint_t      speed_t
typedef     long        ssize_t
typedef     long        suseconds_t
typedef     uint_t      tcflag_t
typedef     long        time_t
typedef     int         uid_t
typedef     int         wchar_t

For 32-bit programs, pointers and the C data types int and long are all 32-bit quantities. For 64-bit programs, pointers and the C data type long are defined as 64-bit quantities.

The preprocessor symbol _ILP32, made visible by the inclusion of <sys/types.h>, can be used with the preprocessor #ifdef construct to define sections of code that will be compiled only as part of a 32-bit version of a given C program.

The preprocessor symbol _LP64 can be used in the same way to define sections of code that will be compiled only as part of a 64-bit version of a given C program. See EXAMPLES.

This header incorporates definitions of other preprocessor symbols that can be useful when keeping code portable between different instruction set architectures.

_LITTLE_ENDIAN
_BIG_ENDIAN

The natural byte order of the processor. A pointer to an int points to the least/most significant byte of that int.

_STACK_GROWS_UPWARD
_STACK_GROWS_DOWNWARD

The processor specific direction of stack growth. A push onto the stack increases/decreases the stack pointer, so it stores data at successively higher/lower addresses.

_CHAR_IS_UNSIGNED
_CHAR_IS_SIGNED

The C Compiler implements objects of type char as unsigned or signed respectively. This is really an implementation choice of the compiler, but it is specified in the ABI and tends to be uniform across compilers for an instruction set architecture.

_CHAR_ALIGNMENT
_SHORT_ALIGNMENT
_INT_ALIGNMENT
_LONG_ALIGNMENT
_LONG_LONG_ALIGNMENT
_DOUBLE_ALIGNMENT
_LONG_DOUBLE_ALIGNMENT
_POINTER_ALIGNMENT
_FLOAT_ALIGNMENT

The ABI defines alignment requirements of each of the primitive object types. Some, if not all, might be hardware requirements as well. The values are expressed in bytes.

_MAX_ALIGNMENT

The most stringent alignment requirement as specified by the ABI. Equal to the maximum of all the above _XXX_ALIGNMENT values.

_LONG_LONG_ALIGNMENT_32

The 32-bit ABI supported by a 64-bit kernel may have different alignment requirements for primitive object types. The value of this identifier is expressed in bytes.

The daddr_t type is used for disk addresses except in an inode on disk. Times are encoded in seconds since 00:00:00 UTC, January 1, 1970. The major and minor parts of a device code specify kind and unit number of a device and are installation-dependent. Offsets are measured in bytes from the beginning of a file.

The label_t[] types are used to save the processor state while another process is running.

Example 1 Use of preprocessor symbol _LP64.

In the following example, the preprocessor symbol _LP64 defines sections of code that will be compiled only as part of a 64-bit version of the given C program.


#include <sys/types.h>
...
#ifdef _LP64


        printf("The data model is LP64 in this environment\n");
#else
#ifdef _ILP32


        printf("The data model is ILP32 in this environment\n");
#else
#error "Unknown data model!"
#endif
#endif

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE
Interface Stability Stable

types32.h(3HEAD), attributes(7), lfcompile(7), standards(7)

August 16, 2024 OmniOS