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NAME="NET-COMMON-TCPIP-MANPAGES-IOCTL">ioctl</H1
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NAME="NET-COMMON-TCPIP-MANPAGES-IOCTL">ioctl</H1
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>IOCTL(2) System Calls Manual IOCTL(2)
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>IOCTL(2) System Calls Manual IOCTL(2)
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NAME
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NAME
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ioctl - control device
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ioctl - control device
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SYNOPSIS
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SYNOPSIS
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#include <sys/ioctl.h>
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#include <sys/ioctl.h>
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int
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int
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ioctl(int d, unsigned long request, ...);
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ioctl(int d, unsigned long request, ...);
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DESCRIPTION
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DESCRIPTION
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The ioctl() function manipulates the underlying device parameters of spe-
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The ioctl() function manipulates the underlying device parameters of spe-
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cial files. In particular, many operating characteristics of character
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cial files. In particular, many operating characteristics of character
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special files (e.g., terminals) may be controlled with ioctl() requests.
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special files (e.g., terminals) may be controlled with ioctl() requests.
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The argument d must be an open file descriptor. The third argument is
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The argument d must be an open file descriptor. The third argument is
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called arg and contains additional information needed by this device to
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called arg and contains additional information needed by this device to
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perform the requested function. arg is either an int or a pointer to a
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perform the requested function. arg is either an int or a pointer to a
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device-specific data structure, depending upon the given request.
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device-specific data structure, depending upon the given request.
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An ioctl request has encoded in it whether the argument is an ``in''
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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 third argument (arg)
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parameter or ``out'' parameter, and the size of the third argument (arg)
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in bytes. Macros and defines used in specifying an ioctl request are
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in bytes. Macros and defines used in specifying an ioctl request are
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located in the file <sys/ioctl.h>.
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located in the file <sys/ioctl.h>.
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RETURN VALUES
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RETURN VALUES
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If an error has occurred, a value of -1 is returned and errno is set to
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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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indicate the error.
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ERRORS
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ERRORS
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ioctl() will fail if:
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ioctl() will fail if:
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[EBADF] d is not a valid descriptor.
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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] d is not associated with a character special device.
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[ENOTTY] The specified request does not apply to the kind of
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[ENOTTY] The specified request does not apply to the kind of
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object that the descriptor d references.
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object that the descriptor d references.
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[EINVAL] request or arg is not valid.
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[EINVAL] request or arg is not valid.
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[EFAULT] arg points outside the process's allocated address
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[EFAULT] arg points outside the process's allocated address
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space.
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space.
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SEE ALSO
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SEE ALSO
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cdio(1), chio(1), mt(1), execve(2), fcntl(2), intro(4), tty(4)
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cdio(1), chio(1), mt(1), execve(2), fcntl(2), intro(4), tty(4)
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HISTORY
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HISTORY
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An ioctl() function call appeared in Version 7 AT&T UNIX.
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An ioctl() function call appeared in Version 7 AT&T UNIX.
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BSD December 11, 1993 BSD
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BSD December 11, 1993 BSD
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