Configuration Language

The language in which configuration scripts are written consists of a sequence of commands, each of which is interpreted separately. The following reserved keywords are defined: assign, push, pop, runwait, and run. The comment character is #. Blank lines are not significant. No line in a command script can exceed 1024 characters.

assign Keyword

The assign keyword is used to define environment variables.

assign variable=value

variable is the name of the environment variable and value is the value to be assigned to it. The value assigned must be a string constant. No form of parameter substitution is available. value can be quoted. The quoting rules are those that the shell uses for defining environment variables. assign fails if space cannot be allocated for the new variable or if any part of the specification is invalid.

push Keyword

The push keyword is used to push STREAMS modules onto the stream designated by fd. See the doconfig(3NSL) man page.

push module1[, module2, module3, ...]

module1 is the name of the first module to be pushed, module2 is the name of the second module to be pushed, and so on. The command fails if any of the named modules cannot be pushed. If a module cannot be pushed, the subsequent modules on the same command line are ignored and modules that have already been pushed are popped.

pop Keyword

The pop keyword is used to pop STREAMS modules off the designated stream.

pop [module]

If pop is invoked with no arguments, the top module on the stream is popped. If an argument is given, modules are popped one at a time until the named module is at the top of the stream. If the named module is not on the designated stream, the stream is left as it was and the command fails. If module is the special keyword ALL, then all modules on the stream are popped. Note that only modules above the topmost driver are affected.

runwait Keyword

The runwait keyword runs a command and waits for it to complete.

runwait command

command is the path name of the command to be run. The command is run with /bin/sh -c prepended to it. Shell scripts can thus be executed from configuration scripts. The runwait command fails if command cannot be found or cannot be executed, or if command exits with a nonzero status.

run Keyword

The run keyword is identical to runwait except that it does not wait for command to complete.

run command

command is the path name of the command to be run. run does not fail unless it is unable to create a child process to execute the command.

Although they are syntactically indistinguishable, some of the commands available to run and runwait are interpreter built-in commands. Interpreter built-ins are used when it is necessary to alter the state of a process within the context of that process. The doconfig() interpreter built-in commands are similar to the shell special commands and, like these commands, they do not spawn another process for execution. See the sh(1) man page. The initial set of built-in commands is:

cd ulimit umask