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These
functions set, unset and fetch environment variables from the host For
compatibility with differing environment conventions, the given arguments
and may be appended and prepended, respectively, with an equal sign
The function obtains the current value of the environment variable,
If the variable is not in the current environment , a null pointer is
returned. The function inserts or resets the environment variable in
the current environment list. If the variable does not exist in the list,
it is inserted with the given If the variable does exist, the argument
is tested; if zero, the variable is not reset, otherwise it is reset
to the given The function takes an argument of the form ‘‘name=value’’ and
is equivalent to: setenv(name, value, 1); The function deletes all
instances of the variable name pointed to by from the list.
The
functions and return zero if successful; otherwise the global variable
is set to indicate the error and a -1 is returned.
The function
or failed because they were unable to allocate memory for the environment.
The function conforms to
The functions
and appeared in The function appeared in
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