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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _USER_EVENTS_SELFTESTS_H
#define _USER_EVENTS_SELFTESTS_H
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <unistd.h>
#include <errno.h>
#include "../kselftest.h"
static inline void tracefs_unmount(void)
{
umount("/sys/kernel/tracing");
}
static inline bool tracefs_enabled(char **message, bool *fail, bool *umount)
{
struct stat buf;
int ret;
*message = "";
*fail = false;
*umount = false;
/* Ensure tracefs is installed */
ret = stat("/sys/kernel/tracing", &buf);
if (ret == -1) {
*message = "Tracefs is not installed";
return false;
}
/* Ensure mounted tracefs */
ret = stat("/sys/kernel/tracing/README", &buf);
if (ret == -1 && errno == ENOENT) {
if (mount(NULL, "/sys/kernel/tracing", "tracefs", 0, NULL) != 0) {
*message = "Cannot mount tracefs";
*fail = true;
return false;
}
*umount = true;
ret = stat("/sys/kernel/tracing/README", &buf);
}
if (ret == -1) {
*message = "Cannot access tracefs";
*fail = true;
return false;
}
return true;
}
static inline bool user_events_enabled(char **message, bool *fail, bool *umount)
{
struct stat buf;
int ret;
*message = "";
*fail = false;
*umount = false;
if (getuid() != 0) {
*message = "Must be run as root";
*fail = true;
return false;
}
if (!tracefs_enabled(message, fail, umount))
return false;
/* Ensure user_events is installed */
ret = stat("/sys/kernel/tracing/user_events_data", &buf);
if (ret == -1) {
switch (errno) {
case ENOENT:
*message = "user_events is not installed";
return false;
default:
*message = "Cannot access user_events_data";
*fail = true;
return false;
}
}
return true;
}
#define USER_EVENT_FIXTURE_SETUP(statement, umount) do { \
char *message; \
bool fail; \
if (!user_events_enabled(&message, &fail, &(umount))) { \
if (fail) { \
TH_LOG("Setup failed due to: %s", message); \
ASSERT_FALSE(fail); \
} \
SKIP(statement, "Skipping due to: %s", message); \
} \
} while (0)
#define USER_EVENT_FIXTURE_TEARDOWN(umount) do { \
if ((umount)) \
tracefs_unmount(); \
} while (0)
#endif /* _USER_EVENTS_SELFTESTS_H */
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