60 lines
1.6 KiB
Groff
60 lines
1.6 KiB
Groff
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IOCTL(2) Minix Programmer's Manual IOCTL(2)
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NAME
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ioctl - control device
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SYNOPSIS
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#include <sys/types.h>
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#include <sys/ioctl.h>
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int ioctl(int d, int request, void *argp) (Minix)
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int ioctl(int d, ioreq_t request, void *argp) (Minix-vmd)
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DESCRIPTION
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Ioctl performs a variety of functions on open descriptors. In
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particular, many operating characteristics of character special files
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(e.g. terminals) may be controlled with ioctl requests. The writeups of
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various devices in section 4 discuss how ioctl applies to them.
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An ioctl request has encoded in it whether the argument is an "in"
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parameter or "out" parameter, and the size of the argument argp in bytes.
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Macros and defines used in specifying an ioctl request are located in the
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file <sys/ioctl.h>.
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RETURN VALUE
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If an error has occurred, a value of -1 is returned and errno is set to
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indicate the error.
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ERRORS
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Ioctl will fail if one or more of the following are true:
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[EBADF] D is not a valid descriptor.
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[ENOTTY] D is not associated with a character special device.
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[ENOTTY] The specified request does not apply to the kind of object
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that the descriptor d references.
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[EINVAL] Request or argp is not valid.
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SEE ALSO
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execve(2), fcntl(2), mt(4), tty(4), intro(4).
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4BSD March 4, 1986 1
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