types.h
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上传日期:2009-04-28
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- /* bits/types.h -- definitions of __*_t types underlying *_t types.
- Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- /*
- * Never include this file directly; use <sys/types.h> instead.
- */
- #ifndef _BITS_TYPES_H
- #define _BITS_TYPES_H 1
- #include <features.h>
- #include <bits/wordsize.h>
- #define __need_size_t
- #include <stddef.h>
- /* Convenience types. */
- typedef unsigned char __u_char;
- typedef unsigned short int __u_short;
- typedef unsigned int __u_int;
- typedef unsigned long int __u_long;
- /* Fixed-size types, underlying types depend on word size and compiler. */
- typedef signed char __int8_t;
- typedef unsigned char __uint8_t;
- typedef signed short int __int16_t;
- typedef unsigned short int __uint16_t;
- typedef signed int __int32_t;
- typedef unsigned int __uint32_t;
- #if __WORDSIZE == 64
- typedef signed long int __int64_t;
- typedef unsigned long int __uint64_t;
- #elif defined __GLIBC_HAVE_LONG_LONG
- __extension__ typedef signed long long int __int64_t;
- __extension__ typedef unsigned long long int __uint64_t;
- #endif
- /* quad_t is also 64 bits. */
- #if __WORDSIZE == 64
- typedef long int __quad_t;
- typedef unsigned long int __u_quad_t;
- #elif defined __GLIBC_HAVE_LONG_LONG
- __extension__ typedef long long int __quad_t;
- __extension__ typedef unsigned long long int __u_quad_t;
- #else
- typedef struct
- {
- long __val[2];
- } __quad_t;
- typedef struct
- {
- __u_long __val[2];
- } __u_quad_t;
- #endif
- /* The machine-dependent file <bits/typesizes.h> defines __*_T_TYPE
- macros for each of the OS types we define below. The definitions
- of those macros must use the following macros for underlying types.
- We define __S<SIZE>_TYPE and __U<SIZE>_TYPE for the signed and unsigned
- variants of each of the following integer types on this machine.
- 16 -- "natural" 16-bit type (always short)
- 32 -- "natural" 32-bit type (always int)
- 64 -- "natural" 64-bit type (long or long long)
- LONG32 -- 32-bit type, traditionally long
- QUAD -- 64-bit type, always long long
- WORD -- natural type of __WORDSIZE bits (int or long)
- LONGWORD -- type of __WORDSIZE bits, traditionally long
- We distinguish WORD/LONGWORD, 32/LONG32, and 64/QUAD so that the
- conventional uses of `long' or `long long' type modifiers match the
- types we define, even when a less-adorned type would be the same size.
- This matters for (somewhat) portably writing printf/scanf formats for
- these types, where using the appropriate l or ll format modifiers can
- make the typedefs and the formats match up across all GNU platforms. If
- we used `long' when it's 64 bits where `long long' is expected, then the
- compiler would warn about the formats not matching the argument types,
- and the programmer changing them to shut up the compiler would break the
- program's portability.
- Here we assume what is presently the case in all the GCC configurations
- we support: long long is always 64 bits, long is always word/address size,
- and int is always 32 bits. */
- #define __S16_TYPE short int
- #define __U16_TYPE unsigned short int
- #define __S32_TYPE int
- #define __U32_TYPE unsigned int
- #define __SLONGWORD_TYPE long int
- #define __ULONGWORD_TYPE unsigned long int
- #if __WORDSIZE == 32
- # define __SQUAD_TYPE __quad_t
- # define __UQUAD_TYPE __u_quad_t
- # define __SWORD_TYPE int
- # define __UWORD_TYPE unsigned int
- # define __SLONG32_TYPE long int
- # define __ULONG32_TYPE unsigned long int
- # define __S64_TYPE __quad_t
- # define __U64_TYPE __u_quad_t
- #elif __WORDSIZE == 64
- # define __SQUAD_TYPE long int
- # define __UQUAD_TYPE unsigned long int
- # define __SWORD_TYPE long int
- # define __UWORD_TYPE unsigned long int
- # define __SLONG32_TYPE int
- # define __ULONG32_TYPE unsigned int
- # define __S64_TYPE long int
- # define __U64_TYPE unsigned long int
- #else
- # error
- #endif
- #include <bits/typesizes.h> /* Defines __*_T_TYPE macros. */
- /* We want __extension__ before typedef's that use nonstandard base types
- such as `long long' in C89 mode. */
- #define __STD_TYPE __extension__ typedef
- __STD_TYPE __DEV_T_TYPE __dev_t; /* Type of device numbers. */
- __STD_TYPE __UID_T_TYPE __uid_t; /* Type of user identifications. */
- __STD_TYPE __GID_T_TYPE __gid_t; /* Type of group identifications. */
- __STD_TYPE __INO_T_TYPE __ino_t; /* Type of file serial numbers. */
- __STD_TYPE __INO64_T_TYPE __ino64_t; /* Type of file serial numbers (LFS).*/
- __STD_TYPE __MODE_T_TYPE __mode_t; /* Type of file attribute bitmasks. */
- __STD_TYPE __NLINK_T_TYPE __nlink_t; /* Type of file link counts. */
- __STD_TYPE __OFF_T_TYPE __off_t; /* Type of file sizes and offsets. */
- __STD_TYPE __OFF64_T_TYPE __off64_t; /* Type of file sizes and offsets (LFS). */
- __STD_TYPE __PID_T_TYPE __pid_t; /* Type of process identifications. */
- __STD_TYPE __FSID_T_TYPE __fsid_t; /* Type of file system IDs. */
- __STD_TYPE __CLOCK_T_TYPE __clock_t; /* Type of CPU usage counts. */
- __STD_TYPE __RLIM_T_TYPE __rlim_t; /* Type for resource measurement. */
- __STD_TYPE __RLIM64_T_TYPE __rlim64_t; /* Type for resource measurement (LFS). */
- __STD_TYPE __ID_T_TYPE __id_t; /* General type for IDs. */
- __STD_TYPE __TIME_T_TYPE __time_t; /* Seconds since the Epoch. */
- __STD_TYPE __USECONDS_T_TYPE __useconds_t; /* Count of microseconds. */
- __STD_TYPE __SUSECONDS_T_TYPE __suseconds_t; /* Signed count of microseconds. */
- __STD_TYPE __DADDR_T_TYPE __daddr_t; /* The type of a disk address. */
- __STD_TYPE __SWBLK_T_TYPE __swblk_t; /* Type of a swap block maybe? */
- __STD_TYPE __KEY_T_TYPE __key_t; /* Type of an IPC key. */
- /* Clock ID used in clock and timer functions. */
- __STD_TYPE __CLOCKID_T_TYPE __clockid_t;
- /* Timer ID returned by `timer_create'. */
- __STD_TYPE __TIMER_T_TYPE __timer_t;
- /* Type to represent block size. */
- __STD_TYPE __BLKSIZE_T_TYPE __blksize_t;
- /* Types from the Large File Support interface. */
- /* Type to count number of disk blocks. */
- __STD_TYPE __BLKCNT_T_TYPE __blkcnt_t;
- __STD_TYPE __BLKCNT64_T_TYPE __blkcnt64_t;
- /* Type to count file system blocks. */
- __STD_TYPE __FSBLKCNT_T_TYPE __fsblkcnt_t;
- __STD_TYPE __FSBLKCNT64_T_TYPE __fsblkcnt64_t;
- /* Type to count file system nodes. */
- __STD_TYPE __FSFILCNT_T_TYPE __fsfilcnt_t;
- __STD_TYPE __FSFILCNT64_T_TYPE __fsfilcnt64_t;
- __STD_TYPE __SSIZE_T_TYPE __ssize_t; /* Type of a byte count, or error. */
- /* These few don't really vary by system, they always correspond
- to one of the other defined types. */
- typedef __off64_t __loff_t; /* Type of file sizes and offsets (LFS). */
- typedef __quad_t *__qaddr_t;
- typedef char *__caddr_t;
- /* Duplicates info from stdint.h but this is used in unistd.h. */
- __STD_TYPE __SWORD_TYPE __intptr_t;
- /* Duplicate info from sys/socket.h. */
- __STD_TYPE __U32_TYPE __socklen_t;
- #undef __STD_TYPE
- #endif /* bits/types.h */