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common/daemon: in DEVELOPER mode, check for tal_parent() loops.

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If you steal something onto its own child, you create a loop.  These are
expensive to check for at runtime, but they can hide from memleak and are
usually a bad idea.  So we add a tal_steal() notify which does this work
in DEVELOPER mdoe.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2018-10-25 10:16:10 +10:30
parent 3e2dea221b
commit 22b8a88b48
1 changed files with 29 additions and 0 deletions
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29
common/daemon.c
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@ -1,3 +1,4 @@
#include <assert.h>
#include <backtrace-supported.h>
#include <backtrace.h>
#include <ccan/err/err.h>
@ -78,6 +79,33 @@ int daemon_poll(struct pollfd *fds, nfds_t nfds, int timeout)
return poll(fds, nfds, timeout);
}
#if DEVELOPER
static void steal_notify(tal_t *child, enum tal_notify_type n, tal_t *newparent)
{
tal_t *p = newparent;
assert(tal_parent(child) == newparent);
while ((p = tal_parent(p)) != NULL)
assert(p != child);
}
static void add_steal_notifier(tal_t *parent UNUSED,
enum tal_notify_type type UNNEEDED,
void *child)
{
tal_add_notifier(child, TAL_NOTIFY_ADD_CHILD, add_steal_notifier);
tal_add_notifier(child, TAL_NOTIFY_STEAL, steal_notify);
}
static void add_steal_notifiers(const tal_t *root)
{
tal_add_notifier(root, TAL_NOTIFY_ADD_CHILD, add_steal_notifier);
for (const tal_t *i = tal_first(root); i; i = tal_next(i))
add_steal_notifiers(i);
}
#endif
void daemon_setup(const char *argv0,
void (*backtrace_print)(const char *fmt, ...),
void (*backtrace_exit)(void))
@ -91,6 +119,7 @@ void daemon_setup(const char *argv0,
/* Suppresses backtrace (breaks valgrind) */
if (!getenv("LIGHTNINGD_DEV_NO_BACKTRACE"))
backtrace_state = backtrace_create_state(argv0, 0, NULL, NULL);
add_steal_notifiers(NULL);
#else
backtrace_state = backtrace_create_state(argv0, 0, NULL, NULL);
#endif