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Copyright 1991 David Jurgens |
TC: int ioctl( int handle, int cmd [, void *argdx, int argcx] )
- prototype in io.h
- direct interface to INT 21,44 (IOCTL)
- cmd = 0 get device information
1 set device information (in argdx)
2 read argcx bytes into addr given by argdx
3 write argcx bytes from addr given by argdx
4 same as 2, but handle treated as drive (0=def.,1=A)
5 same as 3, but handle treated as drive (0=def.,1=A)
6 get input status
7 get output status
8 test removability (DOS 3.x)
11 set sharing conflict retry count (DOS 3.x)
- cmd = 0,1; returns device information (DX of IOCTL call)
- cmd = 2-5; returns count of bytes transferred
- cmd = 6,7; returns device status
- returns -1 on error & errno = EINVAL, EBADF, or EINVDAT
- no corresponding function in MS C
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ioctl |
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