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#include "failtest_helper.h"
#include "logging.h"
#include <string.h>
#include <ccan/tap/tap.h>
/* FIXME: From ccan/str */
static inline bool strends(const char *str, const char *postfix)
{
if (strlen(str) < strlen(postfix))
return false;
return !strcmp(str + strlen(str) - strlen(postfix), postfix);
}
bool failmatch(const struct failtest_call *call,
const char *file, int line, enum failtest_call_type type)
{
return call->type == type
&& call->line == line
&& ((strcmp(call->file, file) == 0)
|| (strends(call->file, file)
&& (call->file[strlen(call->file) - strlen(file) - 1]
== '/')));
}
static const struct failtest_call *
find_repeat(const struct failtest_call *start, const struct failtest_call *end,
const struct failtest_call *call)
{
const struct failtest_call *i;
for (i = start; i < end; i++) {
if (failmatch(i, call->file, call->line, call->type))
return i;
}
return NULL;
}
static bool is_nonblocking_lock(const struct failtest_call *call)
{
return call->type == FAILTEST_FCNTL && call->u.fcntl.cmd == F_SETLK;
}
static bool is_unlock(const struct failtest_call *call)
{
return call->type == FAILTEST_FCNTL
&& call->u.fcntl.arg.fl.l_type == F_UNLCK;
}
bool exit_check_log(struct failtest_call *history, unsigned num)
{
unsigned int i;
for (i = 0; i < num; i++) {
if (!history[i].fail)
continue;
/* Failing the /dev/urandom open doesn't count: we fall back. */
if (failmatch(&history[i], URANDOM_OPEN))
continue;
/* Similarly with read fail. */
if (failmatch(&history[i], URANDOM_READ))
continue;
/* Initial allocation of tdb doesn't log. */
if (failmatch(&history[i], INITIAL_TDB_MALLOC))
continue;
/* We don't block "failures" on non-blocking locks. */
if (is_nonblocking_lock(&history[i]))
continue;
if (!tap_log_messages)
diag("We didn't log for %u (%s:%u)",
i, history[i].file, history[i].line);
return tap_log_messages != 0;
}
return true;
}
/* Some places we soldier on despite errors: only fail them once. */
enum failtest_result
block_repeat_failures(struct failtest_call *history, unsigned num)
{
const struct failtest_call *i, *last = &history[num-1];
if (failmatch(last, INITIAL_TDB_MALLOC)
|| failmatch(last, URANDOM_OPEN)
|| failmatch(last, URANDOM_READ)) {
if (find_repeat(history, last, last))
return FAIL_DONT_FAIL;
return FAIL_PROBE;
}
/* Unlock or non-blocking lock is fail-once. */
if (is_unlock(last)) {
/* Find a previous unlock at this point? */
for (i = find_repeat(history, last, last);
i;
i = find_repeat(history, i, last)) {
if (is_unlock(i))
return FAIL_DONT_FAIL;
}
return FAIL_PROBE;
} else if (is_nonblocking_lock(last)) {
/* Find a previous non-blocking lock at this point? */
for (i = find_repeat(history, last, last);
i;
i = find_repeat(history, i, last)) {
if (is_nonblocking_lock(i))
return FAIL_DONT_FAIL;
}
return FAIL_PROBE;
}
return FAIL_OK;
}
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