This is the standard C library
getenv() function from stdlib.h. It gets the value of a specified environment variable.
The default implementation returns
indicating that no environment information is available.
If you re-implement
getenv(), ARM® recommends that you
re-implement it in such a way that it searches some form of environment list for the input
. The set of
environment names and the method for altering the environment list are
getenv() does not depend on any
other function, and no other function depends on
A function closely associated with
called during startup if it is defined, to enable a user re-implementation
getenv() to initialize itself.
The return value is a pointer to a string associated with
the matched list member. The array pointed to must not be modified
by the program, but might be overwritten by a subsequent call to