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28 .\" @(#)ioctl.2 8.2 (Berkeley) 12/11/93
30 .\" $FreeBSD: src/lib/libc/sys/ioctl.2,v 1.7.2.7 2001/12/14 18:34:01 ru Exp $
31 .\" $DragonFly: src/lib/libc/sys/ioctl.2,v 1.4 2008/11/10 23:47:31 swildner Exp $
44 .Fn ioctl "int d" "unsigned long request" ...
48 system call manipulates the underlying device parameters of special files.
49 In particular, many operating
50 characteristics of character special files (e.g.\& terminals)
51 may be controlled with
56 must be an open file descriptor.
60 is traditionally named
64 however, require the third argument to be a
72 has encoded in it whether the argument is an
76 argument, and the size of the argument
79 Macros and defines used in specifying an ioctl
81 are located in the file
84 If an error has occurred, a value of -1 is returned and
86 is set to indicate the error.
93 is not a valid descriptor.
96 is not associated with a character
99 The specified request does not apply to the kind
100 of object that the descriptor
110 points outside the process's allocated address space.
121 function call appeared in