BSD 2.11 - man page for ioctl (bsd section 2)
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ioctl - control device
ioctl(d, request, argp)
unsigned long request;
Ioctl performs a variety of functions on open descriptors. In particular, many operating
characteristics of character special files (e.g. terminals) may be controlled with ioctl
requests. The writeups of various devices in section 4 discuss how ioctl applies to them.
An ioctl request has encoded in it whether the argument is an "in" parameter or "out"
parameter, and the size of the argument argp in bytes. Macros and defines used in speci-
fying an ioctl request are located in the file <sys/ioctl.h>.
If an error has occurred, a value of -1 is returned and errno is set to indicate the
Ioctl will fail if one or more of the following are true:
[EBADF] D is not a valid descriptor.
[ENOTTY] D is not associated with a character special device.
[ENOTTY] The specified request does not apply to the kind of object that the
descriptor d references.
[EINVAL] Request or argp is not valid.
execve(2), fcntl(2), mt(4), tty(4), intro(4N)
4th Berkeley Distribution March 4, 1986 IOCTL(2)
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