119 lines
4.2 KiB
C
Executable file
119 lines
4.2 KiB
C
Executable file
/* The <sys/types.h> header contains important data type definitions.
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* It is considered good programming practice to use these definitions,
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* instead of the underlying base type. By convention, all type names end
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* with _t.
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*/
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#ifndef _TYPES_H
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#define _TYPES_H
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#ifndef _ANSI_H
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#include <ansi.h>
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#endif
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/* The type size_t holds all results of the sizeof operator. At first glance,
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* it seems obvious that it should be an unsigned int, but this is not always
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* the case. For example, MINIX-ST (68000) has 32-bit pointers and 16-bit
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* integers. When one asks for the size of a 70K struct or array, the result
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* requires 17 bits to express, so size_t must be a long type. The type
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* ssize_t is the signed version of size_t.
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*/
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#ifndef _SIZE_T
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#define _SIZE_T
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typedef unsigned int size_t;
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#endif
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#ifndef _SSIZE_T
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#define _SSIZE_T
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typedef int ssize_t;
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#endif
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#ifndef _TIME_T
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#define _TIME_T
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typedef long time_t; /* time in sec since 1 Jan 1970 0000 GMT */
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#endif
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#ifndef _CLOCK_T
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#define _CLOCK_T
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typedef long clock_t; /* unit for system accounting */
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#endif
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#ifndef _SIGSET_T
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#define _SIGSET_T
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typedef unsigned long sigset_t;
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#endif
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/* Types used in disk, inode, etc. data structures. */
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typedef short dev_t; /* holds (major|minor) device pair */
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typedef char gid_t; /* group id */
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typedef unsigned long ino_t; /* i-node number (V3 filesystem) */
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typedef unsigned short mode_t; /* file type and permissions bits */
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typedef short nlink_t; /* number of links to a file */
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typedef unsigned long off_t; /* offset within a file */
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typedef int pid_t; /* process id (must be signed) */
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typedef short uid_t; /* user id */
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typedef unsigned long zone_t; /* zone number */
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typedef unsigned long block_t; /* block number */
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typedef unsigned long bit_t; /* bit number in a bit map */
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typedef unsigned short zone1_t; /* zone number for V1 file systems */
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typedef unsigned short bitchunk_t; /* collection of bits in a bitmap */
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typedef unsigned char u8_t; /* 8 bit type */
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typedef unsigned short u16_t; /* 16 bit type */
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typedef unsigned long u32_t; /* 32 bit type */
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typedef char i8_t; /* 8 bit signed type */
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typedef short i16_t; /* 16 bit signed type */
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typedef long i32_t; /* 32 bit signed type */
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typedef struct { u32_t _[2]; } u64_t;
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/* The following types are needed because MINIX uses K&R style function
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* definitions (for maximum portability). When a short, such as dev_t, is
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* passed to a function with a K&R definition, the compiler automatically
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* promotes it to an int. The prototype must contain an int as the parameter,
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* not a short, because an int is what an old-style function definition
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* expects. Thus using dev_t in a prototype would be incorrect. It would be
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* sufficient to just use int instead of dev_t in the prototypes, but Dev_t
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* is clearer.
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*/
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typedef int Dev_t;
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typedef int Gid_t;
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typedef int Nlink_t;
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typedef int Uid_t;
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typedef int U8_t;
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typedef unsigned long U32_t;
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typedef int I8_t;
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typedef int I16_t;
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typedef long I32_t;
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/* ANSI C makes writing down the promotion of unsigned types very messy. When
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* sizeof(short) == sizeof(int), there is no promotion, so the type stays
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* unsigned. When the compiler is not ANSI, there is usually no loss of
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* unsignedness, and there are usually no prototypes so the promoted type
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* doesn't matter. The use of types like Ino_t is an attempt to use ints
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* (which are not promoted) while providing information to the reader.
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*/
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typedef unsigned long Ino_t;
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#if _EM_WSIZE == 2
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/*typedef unsigned int Ino_t; Ino_t is now 32 bits */
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typedef unsigned int Zone1_t;
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typedef unsigned int Bitchunk_t;
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typedef unsigned int U16_t;
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typedef unsigned int Mode_t;
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#else /* _EM_WSIZE == 4, or _EM_WSIZE undefined */
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/*typedef int Ino_t; Ino_t is now 32 bits */
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typedef int Zone1_t;
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typedef int Bitchunk_t;
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typedef int U16_t;
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typedef int Mode_t;
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#endif /* _EM_WSIZE == 2, etc */
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/* Signal handler type, e.g. SIG_IGN */
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typedef void _PROTOTYPE( (*sighandler_t), (int) );
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#endif /* _TYPES_H */
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