08-23-2006
cannot understand u
Quote:
Originally Posted by steelrose
I've looked at both of those before (and just now again to be sure). I understand that it is some sort of input looking for a terminal session, but I don't understand why it's treating the assignment as something needing a terminal.
hint is not enough
pleade support more thanks pankaj
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ioctl(2) System Calls Manual ioctl(2)
Name
ioctl - control device
Syntax
#include <sys/ioctl.h>
ioctl(d, request, argp)
int d, request;
char *argp;
Description
The call performs a variety of functions on open descriptors. In particular, many operating characteristics of character special files
(for example, terminals) can be controlled with requests. Certain requests operate on a number of device types. These include informa-
tional requests, such as and The descriptions of various devices in the Reference Pages, Section 4: Special Files discuss how applies to
them. Also consult <sys/ioctl.h> for more information.
An 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 specifying an request are located in the file <sys/ioctl.h>.
Return Values
If an error has occurred, a value of -1 is returned, and errno is set to indicate the error.
Diagnostics
The call fails under the following conditions:
[EBADF] The d is not a valid descriptor.
[ENOTTY] The d is not associated with a character special device.
[ENOTTY] The specified request does not apply to the kind of object which the descriptor d references.
[EINVAL] The request or argp is not valid.
[EFAULT] The argp points to memory that is not part of the process' address space.
See Also
execve(2), fcntl(2), devio(4), intro(4n), mu(4), nbuf(4), tty(4)
ioctl(2)