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CVS commit: src/lib/libc/stdlib

Module Name:    src
Committed By:   tron
Date:           Tue Nov 16 17:23:10 UTC 2010

Modified Files:
        src/lib/libc/stdlib: _env.c

Log Message:
Implement mark & sweep garbage collection as suggested by Enami Tsugutomo
on "current-users" mailing list. Garbage collection is performed if:
1.) We previously allocated memory for the environment array which
    is no longer used because the application overwrote "environ".
2.) We find a non-NULL pointer in the allocated environment array after
    the end of the environment. This happens if the applications attempts
    to clear the environment with something like "environ[0] = NULL;".

To generate a diff of this commit:
cvs rdiff -u -r1.3 -r1.4 src/lib/libc/stdlib/_env.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

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