You probably won’t have much cause to use them, but all the Unix system
calls are available. The Unix system call functions are in the
Unix package. The name of the interface for a particular system
call is the name of the system call prepended with
system usually defines the associated constants without any prefix name.
To find out how to use a particular system call, try using
describe on it. If that is unhelpful, look at the source in
unix.lisp or consult your system maintainer.
The Unix system calls indicate an error by returning
nil as the
first value and the Unix error number as the second value. If the call
succeeds, then the first value will always be non-
For example, to use the
(multiple-value-bind (success errno) (unix:unix-chdir "/tmp") (unless success (error "Can't change working directory: ~a" (unix:get-unix-error-msg errno))))
This function returns a string describing the Unix error number
error (this is similar to the Unix function