I am a bit confused about the correct way to delete a user defined builtin using
sh_addbuiltin.
.../cmd/ksh93/sh/nvdisc.c says:
/*
* add or replace built-in version of command corresponding to
* The argument is a pointer to the built-in
* if ==1, the built-in will be deleted
* Special builtins cannot be added or deleted return failure
* The return value for adding builtins is a pointer to the node or NULL on
* failure. For delete NULL means success and the node that cannot be
* deleted is returned on failure.
*/
Namval_t *sh_addbuiltin(const char *path, int (*bltin)(int, char*[],void*),void
*extra)
whereas shell.3 manpage says
The sh_addbuiltin() function is used to add, replace or delete
built-in commands. It takes the name of the built-in, name,
a pointer to the function that implements the built-in, fn,
and a pointer that will be passed to the function when it is
invoked. If, fn is non-NULL the built-in command is added
or replaced. Otherwise, the given built-in command will be
deleted.
Which is the correct way to delete a user-defined builtin?
Set extra to 1 or set fn to NULL?
- Finnbarr
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