Borland C++ 3.1 ›

`<dos.h>`

`_8087`	Coprocessor chip flag.
`_argc`	Keeps a count of command-line arguments.
`_argv`	An array of pointers to command-line arguments.
`_chain_intr`	Chains to another interrupt handler.
`_chmod`	Gets or sets DOS file attributes.
`_creat, _dos_creat`	Creates a new file or overwrites an existing one.
`_dos_close`	Closes a file.
`_dos_creatnew`	Creates a new file.
`_dos_findfirst`	Searches a disk directory.
`_dos_findnext`	Continues _dos_findfirst search.
`_dos_getdiskfree`	Gets disk free space.
`_dos_getdrive, _dos_setdrive`	Gets and sets the current drive number.
`_dos_getfileattr, _dos_setfileattr`	Changes file access mode.
`_dos_getftime, _dos_setftime`	Gets and sets file date and time.
`_dos_gettime, _dos_settime`	Gets and sets system time.
`_dos_getvect`	Gets interrupt vector.
`_dos_setvect`	Sets interrupt vector entry.
`_dos_write`	Writes to a file.
`_harderr`	Establishes a hardware error handler.
`_hardresume`	Hardware error handler.
`_hardretn`	Hardware error handler.
`_heaplen`	Holds the length of the near heap.
`_osmajor, _osminor`	Contain the major and minor DOS version numbers.
`_ovrbuffer`	Change the size of the overlay buffer.
`_OvrInitEms`	Initializes expanded memory swapping for the overlay manager.
`_OvrInitExt`	Initializes extended memory swapping for the overlay manager.
`_psp`	Contains the segment address of the program segment prefix (PSP) for the current program.
`_stklen`	Holds size of the stack.
`_version`	Contains the DOS version number.
`absread`	Reads absolute disk sectors.
`abswrite`	Writes absolute disk sectors.
`allocmem, _dos_allocmem`	Allocates DOS memory segment.
`bdos`	Accesses DOS system calls.
`bdosptr`	Accesses DOS system calls.
`country`	Returns country-dependent information.
`creatnew`	Creates a new file.
`creattemp`	Creates a unique file in the directory associated with the path name.
`ctrlbrk`	Sets control-break handler.
`delay`	Suspends execution for an interval (milliseconds).
`disable, _disable, enable, _enable`	Disables and enables interrupts.
`dosexterr`	Gets extended DOS error information.
`dostounix`	Converts date and time to UNIX time format.
`ellipse`	Draws an elliptical arc. Inserts literal values directly into code.
`environ`	Accesses DOS environment variables.
`FP_OFF, FP_SEG`	Gets a far address offset or segment.
`freemem, _dos_freemem`	Frees a previously allocated DOS memory block.
`geninterrupt`	Generates a software interrupt.
`getcbrk`	Gets control-break setting.
`getdate, _dos_getdate, _dos_setdate, setdate`	Gets and sets system date.
`getdfree`	Gets disk free space.
`getdta`	Gets disk transfer address.
`getfat`	Gets file allocation table information for given drive.
`getfatd`	Gets file allocation table information.
`getpsp`	Gets the program segment prefix.
`gettime, settime`	Gets and sets the system time.
`getvect, setvect`	Gets and sets interrupt vector.
`getverify`	Returns the state of the DOS verify flag.
`harderr, hardresume, hardretn`	Establishes and handles hardware errors.
`inport`	Reads a word from a hardware port.
`inportb`	Reads a byte from a hardware port.
`int86`	General 8086 software interrupt.
`int86x`	General 8086 software interrupt interface.
`intdos`	General DOS interrupt interface.
`intdosx`	General DOS interrupt interface.
`intr`	Alternate 8086 software interrupt interface.
`keep, _dos_keep`	Exits and remains resident.
`MK_FP`	Makes a far pointer.
`nosound`	Turns PC speaker off.
`outport, outportb`	Outputs a word or byte to a hardware port.
`parsfnm`	Parses file name.
`peek`	Returns the word at memory location specified by segmentioffset.
`peekb`	Returns the byte of memory specified by segmentoffset.
`poke`	Stores an integer value at a memory location given by segment-.offset.
`pokeb`	Stores a byte value at memory location segmentoffset.
`randbrd`	Reads random block.
`randbwr`	Writes random block.
`segread`	Reads segment registers.
`setblock, _dos_setblock`	Modifies the size of a previously allocated block.
`setcbrk`	Sets control-break setting.
`setdta`	Sets disk-transfer address.
`setverify`	Sets the state of the verify flag in DOS.
`sleep`	Suspends execution for an interval (seconds).
`sound`	Turns PC speaker on at specified frequency.
`unixtodos`