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libctf: add ctf_ref

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This allows you to bump the refcount on a ctf_file_t, so that you can
smuggle it out of iterators which open and close the ctf_file_t for you
around the loop body (like ctf_archive_iter).

You still can't use this to preserve a ctf_file_t for longer than the
lifetime of its containing entity (e.g. ctf_archive).

include/
	* ctf-api.h (ctf_ref): New.
libctf/
	* libctf.ver (ctf_ref): New.
	* ctf-open.c (ctf_ref): Implement it.
This commit is contained in:
Nick Alcock
2020-06-08 09:24:01 +01:00
parent 9850ce4d7b
commit 2399827bfa
5 changed files with 22 additions and 0 deletions
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11
libctf/ctf-open.c
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@ -1620,6 +1620,17 @@ bad:
return NULL;
}
/* Bump the refcount on the specified CTF container, to allow export of
ctf_file_t's from iterators that open and close the ctf_file_t around the
loop. (This does not extend their lifetime beyond that of the ctf_archive_t
in which they are contained.) */
void
ctf_ref (ctf_file_t *fp)
{
fp->ctf_refcnt++;
}
/* Close the specified CTF container and free associated data structures. Note
that ctf_file_close() is a reference counted operation: if the specified file
is the parent of other active containers, its reference count will be greater