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talloc: added talloc_stackframe_exists()

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This can be used to tell if a talloc stackframe is currently
available. Callers can use this to decide if they will use
talloc_tos() or instead use an alternative strategy. This gives us a
way to safely have calls to talloc_tos() in common code that may end
up in external libraries, as long as all talloc_tos() calls in these
pieces of common code check first that a stackframe is available.
This commit is contained in:
Andrew Tridgell 2011-06-17 14:22:28 +10:00
parent e080ae0faa
commit b07e4933b7
2 changed files with 25 additions and 0 deletions
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17
lib/util/talloc_stack.c
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@ -188,3 +188,20 @@ TALLOC_CTX *talloc_tos(void)
return ts->talloc_stack[ts->talloc_stacksize-1];
}
/*
* return true if a talloc stackframe exists
* this can be used to prevent memory leaks for code that can
* optionally use a talloc stackframe (eg. nt_errstr())
*/
bool talloc_stackframe_exists(void)
{
struct talloc_stackframe *ts =
(struct talloc_stackframe *)SMB_THREAD_GET_TLS(global_ts);
if (ts == NULL || ts->talloc_stacksize == 0) {
return false;
}
return true;
}

8
lib/util/talloc_stack.h
View File

@ -53,4 +53,12 @@ TALLOC_CTX *talloc_stackframe_pool(size_t poolsize);
TALLOC_CTX *talloc_tos(void);
/*
* return true if a talloc stackframe exists
* this can be used to prevent memory leaks for code that can
* optionally use a talloc stackframe (eg. nt_errstr())
*/
bool talloc_stackframe_exists(void);
#endif