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[lib] Put symbolic backtrace on system log

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When BGP crashes, sometimes all we get to see is syslog.
This commit is contained in:
Stephen Hemminger 2009-03-09 16:09:50 -07:00 committed by Paul Jakma
parent e5862a2df2
commit 94fc1dd41c
1 changed files with 15 additions and 6 deletions
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21
lib/log.c
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@ -435,10 +435,10 @@ zlog_backtrace_sigsafe(int priority, void *program_counter)
{ {
#ifdef HAVE_STACK_TRACE #ifdef HAVE_STACK_TRACE
static const char pclabel[] = "Program counter: "; static const char pclabel[] = "Program counter: ";
void *array[20]; void *array[64];
int size; int size;
char buf[100]; char buf[100];
char *s; char *s, **bt = NULL;
#define LOC s,buf+sizeof(buf)-s #define LOC s,buf+sizeof(buf)-s
#ifdef HAVE_GLIBC_BACKTRACE #ifdef HAVE_GLIBC_BACKTRACE
@ -485,20 +485,29 @@ zlog_backtrace_sigsafe(int priority, void *program_counter)
syslog_sigsafe(priority|zlog_default->facility,buf,s-buf); syslog_sigsafe(priority|zlog_default->facility,buf,s-buf);
{ {
int i; int i;
#ifdef HAVE_GLIBC_BACKTRACE
bt = backtrace_symbols(array, size);
#endif
/* Just print the function addresses. */ /* Just print the function addresses. */
for (i = 0; i < size; i++) for (i = 0; i < size; i++)
{ {
s = buf; s = buf;
s = str_append(LOC,"[bt "); if (bt)
s = num_append(LOC,i); s = str_append(LOC, bt[i]);
s = str_append(LOC,"] 0x"); else {
s = hex_append(LOC,(u_long)(array[i])); s = str_append(LOC,"[bt ");
s = num_append(LOC,i);
s = str_append(LOC,"] 0x");
s = hex_append(LOC,(u_long)(array[i]));
}
*s = '\0'; *s = '\0';
if (priority <= zlog_default->maxlvl[ZLOG_DEST_MONITOR]) if (priority <= zlog_default->maxlvl[ZLOG_DEST_MONITOR])
vty_log_fixed(buf,s-buf); vty_log_fixed(buf,s-buf);
if (priority <= zlog_default->maxlvl[ZLOG_DEST_SYSLOG]) if (priority <= zlog_default->maxlvl[ZLOG_DEST_SYSLOG])
syslog_sigsafe(priority|zlog_default->facility,buf,s-buf); syslog_sigsafe(priority|zlog_default->facility,buf,s-buf);
} }
if (bt)
free(bt);
} }
} }
#undef DUMP #undef DUMP