Linux Standard Base Specification 2.1 | ||
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The ioctl() function shall manipulate the underlying device parameters of special files. d shall be an open file descriptor referring to a special file. The ioctl() function shall take three parameters; the type and value of the third parameter is dependent on the device and request.
Conforming LSB applications shall not call ioctl() except in situations explicitly stated in this specification.
On success, 0 is returned.
An ioctl() may use the return value as an
output parameter and return a non-negative value on success.
On error, -1 is returned and
the global variable errno
is set appropriately.
d is not a valid descriptor.
The third parameter references an inaccessible memory area.
d is not associated with a character special device.
The specified request does not apply to the kind of object that d references.
request or the third parameter is not valid.
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