1IOCTL(2)                      System Calls Manual                     IOCTL(2)
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NAME

6       ioctl, stty, gtty - control device
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SYNOPSIS

9       #include <sgtty.h>
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11       ioctl(fildes, request, argp)
12       struct sgttyb *argp;
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14       stty(fildes, argp)
15       struct sgttyb *argp;
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17       gtty(fildes, argp)
18       struct sgttyb *argp;
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DESCRIPTION

21       Ioctl  performs  a  variety  of  functions  on  character special files
22       (devices).  The writeups of various devices in section  4  discuss  how
23       ioctl applies to them.
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25       For certain status setting and status inquiries about terminal devices,
26       the functions stty and gtty are equivalent to
27              ioctl(fildes, TIOCSETP, argp)
28              ioctl(fildes, TIOCGETP, argp)
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30       respectively; see tty(4).
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32       The following two calls, however, apply to any open file:
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34              ioctl(fildes, FIOCLEX, NULL);
35              ioctl(fildes, FIONCLEX, NULL);
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37       The first causes the file to be closed automatically during a  success‐
38       ful exec operation; the second reverses the effect of the first.
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SEE ALSO

41       stty(1), tty(4), exec(2)
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DIAGNOSTICS

44       Zero  is returned if the call was successful; -1 if the file descriptor
45       does not refer to the kind of file for which it was intended.
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BUGS

48       Strictly speaking, since ioctl may be extended  in  different  ways  to
49       devices  with different properties, argp should have an open-ended dec‐
50       laration like
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52              union { struct sgttyb ...; ...  } *argp;
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54       The important thing is that the size is fixed by `struct sgttyb'.
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ASSEMBLER

57       (ioctl = 54.)
58       sys ioctl; fildes; request; argp
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60       (stty = 31.)
61       (file descriptor in r0)
62       stty; argp
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64       (gtty = 32.)
65       (file descriptor in r0)
66       sys gtty; argp
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