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29 function clears the contents of the environment.
30 All environment variables in the calling process are removed as though the
33 had been called on every environment variable.
34 Until subsequent calls to
43 Upon successful completion,
47 Otherwise, it returns a non-zero value and sets
49 to indicate the error.
50 At this time, no errors are defined for
52 it will always succeed.
53 Portable applications should always check the return value of
56 No errors are defined.
57 .Sh INTERFACE STABILITY