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README: U_BOOT_ENV_CALLBACK functions

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Describe the interface of environment variable callback functions.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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Heinrich Schuchardt 2018-07-29 11:08:14 +02:00 committed by Tom Rini
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commit 1b04047a87
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@ -3943,6 +3943,17 @@ If CONFIG_REGEX is defined, the variable_name above is evaluated as a
regular expression. This allows multiple variables to be connected to
the same callback without explicitly listing them all out.
The signature of the callback functions is:
int callback(const char *name, const char *value, enum env_op op, int flags)
* name - changed environment variable
* value - new value of the environment variable
* op - operation (create, overwrite, or delete)
* flags - attributes of the environment variable change, see flags H_* in
include/search.h
The return value is 0 if the variable change is accepted and 1 otherwise.
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