IOCTL
Section: System Calls (2)
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NAME
ioctl, stty, gtty - control device
SYNOPSIS
#include <sgtty.h>
ioctl(fildes, request, argp)
struct sgttyb *argp;
stty(fildes, argp)
struct sgttyb *argp;
gtty(fildes, argp)
struct sgttyb *argp;
DESCRIPTION
Ioctl
performs a variety of functions
on character special files (devices).
The writeups of various devices
in section 4 discuss how
ioctl
applies to them.
For certain status setting and status inquiries
about terminal devices, the functions
stty
and
gtty
are equivalent to
-
ioctl(fildes, TIOCSETP, argp)
ioctl(fildes, TIOCGETP, argp)
respectively; see
tty(4).
The following two calls, however, apply to any open file:
-
ioctl(fildes, FIOCLEX, NULL);
ioctl(fildes, FIONCLEX, NULL);
The first causes the file to be closed automatically during
a successful
exec
operation;
the second reverses the effect of the first.
SEE ALSO
stty(1), tty(4), exec(2)
DIAGNOSTICS
Zero is returned if the call was successful;
-1 if the file descriptor does not refer to
the kind of file for which it was intended.
BUGS
Strictly speaking,
since
ioctl
may be extended in different ways to devices with
different properties,
argp
should have an open-ended declaration like
-
union { struct sgttyb
...;
...
} *argp;
The important thing is that the size is fixed by `struct sgttyb'.
ASSEMBLER
(ioctl = 54.)
sys ioctl; fildes; request; argp
(stty = 31.)
(file descriptor in r0)
stty; argp
(gtty = 32.)
(file descriptor in r0)
sys gtty; argp
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- SEE ALSO
-
- DIAGNOSTICS
-
- BUGS
-
- ASSEMBLER
-
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Time: 10:17:28 GMT, December 28, 2024