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/*
* Various routines useful for debugging.
*/
#ifdef USE_BACKTRACE
#include <execinfo.h>
#endif
#include <stdio.h>
#include <stdarg.h>
#include <syslog.h>
#include <unistd.h>
#include "child.h"
#include "debug.h"
#include "log.h"
#include "params.h"
#include "pids.h"
#include "shm.h"
#include "syscall.h"
#include "version.h"
#define BACKTRACE_SIZE 100
static void __show_backtrace(void)
{
#ifdef USE_BACKTRACE
unsigned int j, nptrs;
void *buffer[BACKTRACE_SIZE];
char **strings;
nptrs = backtrace(buffer, BACKTRACE_SIZE);
strings = backtrace_symbols(buffer, nptrs);
if (strings == NULL) {
perror("backtrace_symbols");
return;
}
for (j = 0; j < nptrs; j++)
output(0, "%s\n", strings[j]);
free(strings);
#endif
}
static void show_child_backtrace(void)
{
struct childdata *child = this_child();
set_dontkillme(child, FALSE);
__show_backtrace();
set_dontkillme(child, TRUE);
}
void show_backtrace(void)
{
pid_t pid = getpid();
if (pid == mainpid) {
__show_backtrace();
return;
}
show_child_backtrace();
}
void __BUG(const char *bugtxt, const char *filename, const char *funcname, unsigned int lineno)
{
struct childdata *child = this_child();
printf("BUG!: %s\n", bugtxt);
printf("BUG!: %s\n", VERSION);
printf("BUG!: [%d] %s:%s:%u\n", getpid(), filename, funcname, lineno);
show_backtrace();
/* Now spin indefinitely (but allow ctrl-c) */
set_dontkillme(child, TRUE);
while (1) {
if (shm->exit_reason == EXIT_SIGINT) {
set_dontkillme(child, FALSE);
exit(EXIT_FAILURE);
}
sleep(1);
}
}
void dump_syscallrec(struct syscallrecord *rec)
{
output(0, " nr:%d a1:%lx a2:%lx a3:%lx a4:%lx a5:%lx a6:%lx retval:%ld errno_post:%d\n",
rec->nr, rec->a1, rec->a2, rec->a3, rec->a4, rec->a5, rec->a6, rec->retval, rec->errno_post);
output(0, " do32bit:%d\n", rec->do32bit);
output(0, " lock:%d {owner:%d)\n", rec->lock.lock, rec->lock.owner);
output(0, " state:%d\n", rec->state);
output(0, " prebuffer : %p (len:%d)\n", rec->prebuffer, strlen(rec->prebuffer));
output(0, " -> %s\n", rec->prebuffer);
output(0, " postbuffer : %p (len:%ld)\n", rec->postbuffer, strlen(rec->postbuffer));
output(0, " -> %s\n", rec->postbuffer);
}
void dump_childdata(struct childdata *child)
{
output(0, "child struct @%p\n", child);
output(0, " op_nr:%lx\n", child->op_nr);
output(0, "syscall: %p\n", &child->syscall);
dump_syscallrec(&child->syscall);
if (logging == LOGGING_FILES)
output(0, "logfile: %p (dirty:%d)\n", child->logfile, child->logdirty);
output(0, "objects: %p\n", child->objects);
//TODO: dump each objhead
output(0, " tp.tv_sec=%ld tp.tv_nsec=%ld\n", child->tp.tv_sec, child->tp.tv_nsec);
output(0, "seed: %u\n", child->seed);
output(0, "childnum: %d\n", child->num);
output(0, "killcount: %d\n", child->kill_count);
output(0, "dontkillme: %d\n", child->dontkillme);
output(0, "\n");
};
/*
* debugging output.
* This is just a convenience helper to avoid littering the code
* with dozens of 'if debug == TRUE' comparisons causing unnecessary nesting.
*/
#define BUFSIZE 1024
void debugf(const char *fmt, ...)
{
char debugbuf[BUFSIZE];
va_list args;
if (shm->debug == FALSE)
return;
va_start(args, fmt);
vsprintf(debugbuf, fmt, args);
va_end(args);
output(0, debugbuf);
}
/* This is a bit crappy, wrapping a varargs fn with another,
* but this saves us having to do the openlog/closelog for every
* case where we want to write a message.
*/
void syslogf(const char *fmt, ...)
{
char debugbuf[BUFSIZE];
va_list args;
va_start(args, fmt);
vsprintf(debugbuf, fmt, args);
va_end(args);
openlog("trinity", LOG_CONS|LOG_PERROR, LOG_USER);
syslog(LOG_CRIT, "%s", debugbuf);
closelog();
}
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