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man pages section 1: User Commands     Oracle Solaris 10 8/11 Information Library
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Preface

Introduction

User Commands

acctcom(1)

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strchg

, strconf

- change or query stream configuration

Synopsis

strchg -h module1 [, module2...]
strchg -p [-a | -u module]
strchg -f filename
strconf [-m | -t module]

Description

These commands are used to alter or query the configuration of the stream associated with the user's standard input. The strchg command pushes modules on and/or pops modules off the stream. The strconf command queries the configuration of the stream. Only the super-user or owner of a STREAMS device can alter the configuration of that stream.

Invoked without any arguments, strconf prints a list of all the modules in the stream as well as the topmost driver. The list is printed with one name per line where the first name printed is the topmost module on the stream (if one exists) and the last item printed is the name of the driver.

Options

The following options apply to strchg and, -h, -f, and -p are mutually exclusive.

-a

Pop all the modules above the topmost driver off the stream. This option requires the -p option.

-f filename

Specify a filename that contains a list of modules representing the desired configuration of the stream. Each module name must appear on a separate line where the first name represents the topmost module and the last name represents the module that should be closest to the driver. strchg determines the current configuration of the stream and pop and push the necessary modules in order to end up with the desired configuration.

-h module1 [ , module2. . . ]

Mnemonic for push, pushes modules onto a stream. It takes as arguments the names of one or more pushable streams modules. These modules are pushed in order; that is, module1 is pushed first, module2 is pushed second, etc.

-p

Mnemonic for pop, pops modules off the stream. With the -p option alone, strchg pops the topmost module from the stream.

-u module

All modules above, but not including module are popped off the stream. This option requires the -p option.

The following options apply to strconf and, -m and -t are mutually exclusive.

-m module

Determine if the named module is present on a stream. If it is, strconf prints the message yes and returns zero. If not, strconf prints the message no and returns a non-zero value. The -t and -m options are mutually exclusive.

-t module

Print only the topmost module (if one exists). The -t and -m options are mutually exclusive.

Examples

Example 1 Using the strchg Command

The following command pushes the module ldterm on the stream associated with the user's standard input:

example% strchg -h ldterm

The following command pops the topmost module from the stream associated with /dev/term/24. The user must be the owner of this device or the super user.

example% strchg -p < /dev/term/24

If the file fileconf contains the following:

ttcompat
ldterm
ptem

then the command

example% strchg -f fileconf

configures the user's standard input stream so that the module ptem is pushed over the driver, followed by ldterm and ttcompat closest to the stream head.

The strconf command with no arguments lists the modules and topmost driver on the stream; for a stream that has only the module ldterm pushed above the zs driver, it would produce the following output:

ldterm
zs

The following command asks if ldterm is on the stream:

example% strconf -m ldterm

and produces the following output while returning an exit status of 0:

yes

Attributes

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Availability
SUNWcsu

See Also

attributes(5), streamio(7I)

Diagnostics

strchg returns zero on success. It prints an error message and returns non-zero status for various error conditions, including usage error, bad module name, too many modules to push, failure of an ioctl on the stream, or failure to open filename from the -f option.

strconf returns zero on success (for the -m or -t option, "success" means the named or topmost module is present). It returns a non-zero status if invoked with the -m or -t option and the module is not present. It prints an error message and returns non-zero status for various error conditions, including usage error or failure of an ioctl on the stream.

Notes

If the user is neither the owner of the stream nor the super-user, the strchg command fails. If the user does not have read permissions on the stream and is not the super user, the strconf command fails.

If modules are pushed in the wrong order, one could end up with a stream that does not function as expected. For ttys, if the line discipline module is not pushed in the correct place, one could have a terminal that does not respond to any commands.