What is the function of dos.h?
You can find a copy of that file in here:
http://ftp.ibiblio.org/pub/micro/PC-stuff/freedos/files/devel/c/dos.h
in case the server is down check the extracted file:
#ifndef __DOS_H
#define __DOS_H
#include <_defs.h>
#include <stddef.h>
#ifdef __WATCOMC__
#pragma pack( __push, 1 )
#endif
struct _R16BIT {
unsigned short ax, bx, cx, dx, si, di, es, cs, ss, ds,
flags;
unsigned char cflag;
};
struct _R8BIT {
unsigned char al, ah, bl, bh, cl, ch, dl, dh;
};
union _INTR {
struct _R16BIT x;
struct _R8BIT h;
};
#define INTR _INTR
struct country {
int co_date; /* date format */
char co_curr[ 5 ]; /* currency symbol */
char co_thsep[ 2 ]; /* thousands separator */
char co_desep[ 2 ]; /* decimal separator */
char co_dtsep[ 2 ]; /* date separator */
char co_tmsep[ 2 ]; /* time separator */
char co_currstyle; /* currency style */
char co_digits; /* significant digits in currency */
char co_time; /* time format */
long co_case; /* case map */
char co_dasep[ 2 ]; /* data separator */
char co_fill[ 10 ]; /* filler */
};
#define COUNTRY country
struct DOSERROR {
int de_exterror; /* extended error */
char de_class; /* error class */
char de_action; /* action */
char de_locus; /* error locus */
};
struct date {
unsigned int da_year; /* current year */
unsigned char da_day; /* day of the month */
unsigned char da_mon; /* month (1 = Jan) */
};
struct dosdate_t {
unsigned char day; /* 1--31 */
unsigned char month; /* 1--12 */
unsigned int year; /* 1980--2099 */
unsigned char dayofweek; /* 0--6; 0 = Sunday */
};
struct devhdr {
long dh_next;
short dh_attr;
unsigned short dh_strat;
unsigned short dh_inter;
char dh_name[ 8 ];
};
struct dfree {
unsigned df_avail; /* Available clusters */
unsigned df_total; /* Total clusters */
unsigned df_bsec; /* Bytes per sector */
unsigned df_sclus; /* Sectors per cluster */
};
struct diskfree_t {
unsigned total_clusters;
unsigned avail_clusters;
unsigned sectors_per_cluster;
unsigned bytes_per_sector;
};
typedef struct {
char drive;
char pattern [ 13 ];
char reserved [ 7 ];
char attrib;
short time;
short date;
long size;
char nameZ [ 13 ];
} dosSearchInfo;
struct fatinfo {
char fi_sclus; /* sectors per cluster */
char fi_fatid; /* the FAT id byte */
int fi_nclus; /* number of clusters */
int fi_bysec; /* bytes per sector */
};
struct ffblk {
#ifdef __CLIB_LFN__
unsigned short cr_time; /* time of file creation */
unsigned short cr_date; /* date of file creation */
unsigned short ac_time; /* time of last file access */
unsigned short ac_date; /* date of last file access */
char ff_reserved[ 13 ]; /* reserved for use by DOS */
#else
char ff_reserved[ 21 ]; /* reserved for use by DOS */
#endif
char ff_attrib; /* attribute byte for file */
unsigned short ff_ftime; /* time of last write to file */
unsigned short ff_fdate; /* date of last write to file */
unsigned long ff_fsize; /* length of file in bytes */
#ifdef __CLIB_LFN__
char ff_name[ 256 ]; /* null-terminated filename */
unsigned short lfnhandle;/* DOS LFN support handle */
#else
char ff_name[ 13 ]; /* null-terminated filename */
#endif
};
struct find_t {
#ifdef __CLIB_LFN__
unsigned short cr_time; /* time of file creation */
unsigned short cr_date; /* date of file creation */
unsigned short ac_time; /* time of last file access */
unsigned short ac_date; /* date of last file access */
char reserved[ 13 ]; /* reserved for use by DOS */
#else
char reserved[ 21 ]; /* reserved for use by DOS */
#endif
char attrib; /* attribute byte for file */
unsigned short wr_time; /* time of last write to file */
unsigned short wr_date; /* date of last write to file */
unsigned long size; /* length of file in bytes */
#ifdef __CLIB_LFN__
char name[ 256 ]; /* null-terminated filename */
unsigned short lfnhandle;/* DOS LFN support handle */
#else
char name[ 13 ]; /* null-terminated filename */
#endif
};
#define _find_t find_t
struct fcb {
char fcb_drive;
char fcb_name[ 8 ],
fcb_ext[ 3 ];
short fcb_curblk,
fcb_recsize;
long fcb_filsize;
short fcb_date;
char fcb_resv[ 10 ],
fcb_currec;
long fcb_random;
};
struct xfcb {
char xfcb_flag;
char xfcb_resv[ 5 ];
char xfcb_attr;
struct fcb xfcb_fcb;
};
struct dostime_t {
unsigned char hour; /* Hours */
unsigned char minute; /* Minutes */
unsigned char second; /* Seconds */
unsigned char hsecond; /* Hundredths of seconds */
};
struct time {
unsigned char ti_min; /* minutes */
unsigned char ti_hour; /* hours */
unsigned char ti_hund; /* hundredths of seconds */
unsigned char ti_sec; /* seconds */
};
#ifdef __WATCOMC__
#pragma pack( __pop )
#endif
extern int __getversion( void );
extern char ** environ;
#define _version (*__getversion)()
extern unsigned char _osmajor;
extern unsigned char _osminor;
extern int absread( int drive, int sects, long lsect, void
*buffer );
extern int abswrite( int drive, int sects, long lsect, void
*buffer );
extern int allocmem( unsigned size, unsigned *seg );
extern int bdos( int ah, unsigned dx, unsigned al );
extern int bdosptr( int ah, void *argument, unsigned al );
extern int _callint( union INTR *regs );
extern struct COUNTRY *
country( int xcode, struct COUNTRY *ct );
extern void ctrlbrk( int ( *handler )( void ) );
extern void delay( unsigned mill );
extern void _disable( void );
extern unsigned _dos_allocmem( unsigned size, unsigned *seg
);
extern unsigned _dos_close( int handle );
extern unsigned _dos_creat( const char *path, int attr, unsigned
*handle );
extern unsigned _dos_creatnew( const char *path, int attr,
unsigned *handle );
extern int __cdecl dosexterror( struct DOSERROR *errblk );
extern unsigned _dos_findfirst( char *filename, int attrib, void
*strptr );
extern unsigned _dos_findnext( void *strptr );
extern unsigned _dos_findclose( void *strptr );
extern unsigned _dos_freemem( unsigned seg );
extern void __cdecl _dos_getdate( struct dosdate_t *ptr );
extern unsigned __cdecl
_dos_getdiskfree( unsigned char dr, struct diskfree_t *d );
extern unsigned _dos_getdrive( unsigned *disk );
extern unsigned _dos_getfileattr( const char *filename, unsigned
*attrs );
extern unsigned __cdecl
_dos_getftime( int handle,
unsigned *date,
unsigned *time );
extern void __cdecl _dos_gettime( struct dostime_t *timeptr
);
extern void ( interrupt far *
_dos_getvect( unsigned intno ) )( );
extern void _dos_keep( unsigned char retcode, unsigned size
);
extern unsigned _dos_open( const char *path, unsigned flags,
unsigned *handle );
extern unsigned _dos_read( int handle,
void far *buf,
unsigned len,
unsigned *nread );
extern unsigned _dos_setblock( unsigned newsize,
unsigned seg,
unsigned *max );
extern void _dos_setdate( struct dosdate_t *ptr );
extern void _dos_setdrive( unsigned disk, unsigned *total );
extern unsigned _dos_setfileattr( const char *filename, unsigned
attrs );
extern unsigned _dos_setftime( int handle, unsigned date,
unsigned time );
extern unsigned _dos_settime( struct dostime_t *timeptr );
extern void _dos_setvect( unsigned intno,
void ( interrupt far *vect )() );
extern time_t dostounix( struct date *date, struct time *time
);
extern unsigned _dos_write( int handle,
void far *buf,
unsigned len,
unsigned *bytes );
extern void _enable( void );
extern int freemem( unsigned seg );
extern int getcbrk( void );
extern void __cdecl getdate( struct date *datep );
extern void __cdecl getdfree( unsigned char drive, struct dfree
*dtable );
extern char * getdta( void );
extern void getfat( unsigned char drive, struct fatinfo *dtable
);
extern void getfatd( struct fatinfo *dtable );
extern unsigned getpsp( void );
extern void __cdecl gettime( struct time *timeptr );
extern void ( interrupt far *
getvect( int intno ) )( );
extern int getverify( void );
extern int inp( unsigned id );
extern unsigned inpw( unsigned id );
extern unsigned inport( unsigned id );
extern unsigned char inportb( unsigned id );
extern void keep( unsigned char retcode, unsigned size );
extern void nosound( void );
extern int outp( unsigned id, int value );
extern unsigned outpw( unsigned id, unsigned value );
extern void outport( unsigned id, unsigned value );
extern void outportb( unsigned id, unsigned char value );
extern char * parsfnm( const char *cmdline, struct fcb *ptr, int
al );
extern int peek( unsigned seg, unsigned offs );
extern char peekb( unsigned seg, unsigned offs );
extern void poke( unsigned seg, unsigned offs, int value );
extern void pokeb( unsigned seg, unsigned offs, char value
);
extern int randbrd( struct fcb *buf, int rnum );
extern int randbwr( struct fcb *buf, int rnum );
extern int setblock( unsigned newsize, unsigned seg );
extern int setcbrk( int value );
extern void setdate( struct date *datep );
extern void setdta( char far *dta );
extern void setpsp( unsigned psp );
extern void settime( struct time *timeptr );
extern void setvect( int intno, void ( interrupt far *vect )()
);
extern void setverify( int flag );
extern void sleep( unsigned x );
extern void sound( unsigned frequency );
extern void unixtodos( time_t longtime,
struct date *date,
struct time *time );
extern int unlink( const char *filename );
#define disable _disable
#define enable _enable
#define _A_NORMAL 0x00
#define _A_RDONLY 0x01
#define _A_HIDDEN 0x02
#define _A_SYSTEM 0x04
#define _A_VOLID 0x08
#define _A_SUBDIR 0x10
#define _A_ARCH 0x20
#define FA_NORMAL _A_NORMAL
#define FA_RDONLY _A_RDONLY
#define FA_HIDDEN _A_HIDDEN
#define FA_SYSTEM _A_SYSTEM
#define FA_LABEL _A_VOLID
#define FA_DIREC _A_SUBDIR
#define FA_ARCH _A_ARCH
#define NFDS 20
#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2
#define MK_FP( seg, ofs ) ( ( void * )\
( ( ( unsigned long )( seg ) << 16 ) |\
( unsigned )( ofs ) ) )
#define FP_SEG(fp) ( ( unsigned )( ( unsigned long )( fp )
>> 16 ) )
#define FP_OFF(fp) ( ( unsigned )( fp ) )
#define __peek( a,b ) ( *( ( int far * ) MK_FP ( ( a ), ( b ) )
) )
#define __peekb( a,b ) ( *( ( char far * ) MK_FP ( ( a ), ( b )
) ) )
#define __poke( a,b,c ) ( *( ( int far * ) MK_FP ( (a),(b)) ) =
( int )(c))
#define __pokeb( a,b,c ) ( *( ( char far * ) MK_FP ( (a),(b)) )
= ( char )(c))
#define peek( a,b ) ( *( ( int far * ) MK_FP ( ( a ), ( b ) ) )
)
#define peekb( a,b ) ( *( ( char far * ) MK_FP ( ( a ), ( b ) )
) )
#define poke( a,b,c ) ( *( ( int far * ) MK_FP ( (a),(b)) ) = (
int )(c))
#define pokeb( a,b,c ) ( *( ( char far * ) MK_FP ( (a),(b)) ) =
( char )(c))
#ifndef __NO_INLINE_FUNCTIONS
#pragma aux _enable = "sti";
#pragma aux _disable = "cli";
#pragma aux inp = "in al, dx" parm [dx] value [al] modify [ax
dx];
#pragma aux inpw = "in ax, dx" parm [dx] value [ax] modify [ax
dx];
#pragma aux inport = "in ax, dx" parm [dx] value [ax] modify [ax
dx];
#pragma aux inportb = "in al, dx" parm [dx] value [al] modify
[ax dx];
#pragma aux outp = "out dx, al" parm [dx] [al] value [al] modify
[ax dx];
#pragma aux outpw = "out dx, ax" parm [dx] [ax] value [ax]
modify [ax dx];
#pragma aux outport = "out dx, ax" parm [dx] [ax] modify [ax
dx];
#pragma aux outportb = "out dx, al" parm [dx] [al] modify [ax
dx];
#endif
#endif
