External SAS packages

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Дата изменения: Wed Aug 9 16:29:06 2000
Дата индексирования: Sat Dec 22 12:21:26 2007
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Using external packages

It is possible to incorporate in the SAS software packages that are not part of the official SAS distribution. These we call 'external packages'. All that is needed is to set the environment variable SAS_PATH to point to all directories that contain SAS components, in the form of a colon-separated list. It is required that these additional component are structured as proper SAS extension, as explained in the following section.

Assume that a user wants to use the official SAS distribution in /usr/sas, local additions in /usr/local/sas, and his own additions in $HOME/sas. He will have to set the SAS_DIR and SAS_PATH environment variable and call the sas-setup script (preferably in a login script), e.g. (csh):

setenv SAS_DIR /usr/sas

setenv SAS_PATH $HOME/sas:/usr/local/sas:$SAS_DIR

source /usr/sas/sas-setup.csh

With this setup

the binaries that are installed in the bin subdirectories of the directories in SAS_PATH are in the search path,
the executables will look for their config files in the config subdirectories of SAS_PATH,
the documentation will contain links to the HTML pages in the doc subdirectories of SAS_PATH.

Developing external packages

Packages can be developed outside the official SAS distribution. To develop packages outside the distribution:

Create a directory (e.g. mysas),
Add this directory to the environment variable SAS_PATH (preferably in the login script),
Create a subdirectory packages.

The simplest way to fill this with the proper content is to copy the structure of the SAS distribution. The Makefile in the toplevel directory should contain:

SUBDIRS = packages

MKDIRS = lib bin include doc config

include $(SAS_DIR)/Make.include

packages/Makefile should contain:

SUBDIRS = <list of all packages>

include ${SAS_DIR}/Make.include

In the packages subdirectory one can develop tasks just as they are developed within the SAS distribution (see the task development documentation). This results in packages that are placed in the subdirectory packages. The Makefiles in all subdirectories set the appropriate variables and includes $SAS_DIR/Make.include.

Doing a make in the toplevel directory (mysas) compiles the packages and creates symbolic links. After this the new code and data is available to the SAS.

To make your local SAS tree compatible with the main SAS one, the toplevel directory (e.g. mysas) should contain the subdirectories lib, bin, include, doc and config.

lib should contain all public libraries or symbolic links to them.
bin should contain all public executables or symbolic links to them.
include should contain subdirectories that contain the include files. There should be a subdirectory for each public library and with the same name as the library, or a symbolic link of that name.
doc should contain files with a .ref extension; each of these files should contain a URL to the associated HTML page.
config should contain all the config files, or symbolic links to them.

These conventions are automatically followed once the make file in the top directory (mysas) is created as indicated above.

Updated on: August 9, 2000