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lib: mark some allocations as "active at exit"

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In some cases we really don't want to clean up things even when exiting
(i.e. to keep the logging subsystem going.)  This adds a flag on MGROUPs
to indicate that.

[v2: add "(active at exit)" marker text to debug memstats-at-exit]
Signed-off-by: David Lamparter <equinox@diac24.net>
This commit is contained in:
David Lamparter 2019-12-02 16:20:00 +01:00
parent 0bdeb5e58d
commit 767439c558
3 changed files with 26 additions and 7 deletions
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3
lib/memory.c
View File

@ -163,7 +163,8 @@ static int qmem_exit_walker(void *arg, struct memgroup *mg, struct memtype *mt)
} else if (mt->n_alloc) {
char size[32];
eda->error++;
if (!mg->active_at_exit)
eda->error++;
snprintf(size, sizeof(size), "%10zu", mt->size);
fprintf(eda->fp, "%s: memstats: %-30s: %6zu * %s\n",
eda->prefix, mt->name, mt->n_alloc,

14
lib/memory.h
View File

@ -17,6 +17,7 @@
#ifndef _QUAGGA_MEMORY_H
#define _QUAGGA_MEMORY_H
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <frratomic.h>
@ -48,6 +49,8 @@ struct memgroup {
struct memgroup *next, **ref;
struct memtype *types, **insert;
const char *name;
/* ignore group on dumping memleaks at exit */
bool active_at_exit;
};
/* macro usage:
@ -76,7 +79,7 @@ struct memgroup {
*/
#define DECLARE_MGROUP(name) extern struct memgroup _mg_##name;
#define DEFINE_MGROUP(mname, desc) \
#define _DEFINE_MGROUP(mname, desc, ...) \
struct memgroup _mg_##mname \
__attribute__((section(".data.mgroups"))) = { \
.name = desc, \
@ -84,6 +87,7 @@ struct memgroup {
.next = NULL, \
.insert = NULL, \
.ref = NULL, \
__VA_ARGS__ \
}; \
static void _mginit_##mname(void) __attribute__((_CONSTRUCTOR(1000))); \
static void _mginit_##mname(void) \
@ -99,7 +103,13 @@ struct memgroup {
if (_mg_##mname.next) \
_mg_##mname.next->ref = _mg_##mname.ref; \
*_mg_##mname.ref = _mg_##mname.next; \
}
} \
/* end */
#define DEFINE_MGROUP(mname, desc) \
_DEFINE_MGROUP(mname, desc, )
#define DEFINE_MGROUP_ACTIVEATEXIT(mname, desc) \
_DEFINE_MGROUP(mname, desc, .active_at_exit = true)
#define DECLARE_MTYPE(name) \
extern struct memtype MTYPE_##name[1]; \

16
lib/zlog_targets.c
View File

@ -26,10 +26,18 @@
#include "zlog.h"
#include "zlog_targets.h"
DEFINE_MTYPE_STATIC(LIB, LOG_FD, "log file target")
DEFINE_MTYPE_STATIC(LIB, LOG_FD_NAME, "log file name")
DEFINE_MTYPE_STATIC(LIB, LOG_FD_ROTATE, "log file rotate helper")
DEFINE_MTYPE_STATIC(LIB, LOG_SYSL, "syslog target")
/* these allocations are intentionally left active even when doing full exit
* cleanup, in order to keep the logging subsystem fully functional until the
* absolute end.
*/
DECLARE_MGROUP(LOG)
DEFINE_MGROUP_ACTIVEATEXIT(LOG, "logging subsystem")
DEFINE_MTYPE_STATIC(LOG, LOG_FD, "log file target")
DEFINE_MTYPE_STATIC(LOG, LOG_FD_NAME, "log file name")
DEFINE_MTYPE_STATIC(LOG, LOG_FD_ROTATE, "log file rotate helper")
DEFINE_MTYPE_STATIC(LOG, LOG_SYSL, "syslog target")
struct zlt_fd {
struct zlog_target zt;