/* find the path to the mounted debugfs */
const char *debugfs_find_mountpoint(void)
{
const char **ptr;
char type[100];
FILE *fp;
if (debugfs_found)
return (const char *) debugfs_mountpoint;
ptr = debugfs_known_mountpoints;
while (*ptr) {
if (debugfs_valid_mountpoint(*ptr) == 0) {
debugfs_found = 1;
strncpy(debugfs_mountpoint, *ptr,
sizeof(debugfs_mountpoint));
debugfs_mountpoint[sizeof(debugfs_mountpoint) - 1] = '\0';
return debugfs_mountpoint;
}
ptr++;
}
/* give up and parse /proc/mounts */
fp = fopen("/proc/mounts", "r");
if (fp == NULL) {
fprintf(stderr, "Error - can't open /proc/mounts for read: %s\n",
strerror(errno));
return NULL;
}
while (fscanf(fp, "%*s %"
STR(MAX_PATH)
"s %99s %*s %*d %*d\n",
debugfs_mountpoint, type) == 2) {
if (strcmp(type, "debugfs") == 0)
break;
}
fclose(fp);
if (strcmp(type, "debugfs") != 0)
return NULL;
debugfs_found = 1;
return debugfs_mountpoint;
}
int debugfs_umount(void)
{
char umountcmd[128];
int ret;
/* if it was already mounted, leave it */
if (debugfs_premounted)
return 0;
/* make sure it's a valid mount point */
ret = debugfs_valid_mountpoint(debugfs_mountpoint);
if (ret)
return ret;
snprintf(umountcmd, sizeof(umountcmd),
"/bin/umount %s", debugfs_mountpoint);
return system(umountcmd);
}
/* find the path to the mounted debugfs */
const char *debugfs_find_mountpoint(void)
{
const char **ptr;
char type[100];
FILE *fp;
if (debugfs_found)
return (const char *) debugfs_mountpoint;
ptr = debugfs_known_mountpoints;
while (*ptr) {
if (debugfs_valid_mountpoint(*ptr) == 0) {
debugfs_found = 1;
strcpy(debugfs_mountpoint, *ptr);
return debugfs_mountpoint;
}
ptr++;
}
/* give up and parse /proc/mounts */
fp = fopen("/proc/mounts", "r");
if (fp == NULL)
die("Can't open /proc/mounts for read");
while (fscanf(fp, "%*s %"
STR(MAX_PATH)
"s %99s %*s %*d %*d\n",
debugfs_mountpoint, type) == 2) {
if (strcmp(type, "debugfs") == 0)
break;
}
fclose(fp);
if (strcmp(type, "debugfs") != 0)
return NULL;
debugfs_found = 1;
return debugfs_mountpoint;
}
struct tracepoint_path *tracepoint_id_to_path(u64 config)
{
struct tracepoint_path *path = NULL;
DIR *sys_dir, *evt_dir;
struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
char id_buf[24];
int fd;
u64 id;
char evt_path[MAXPATHLEN];
char dir_path[MAXPATHLEN];
if (debugfs_valid_mountpoint(tracing_events_path))
return NULL;
sys_dir = opendir(tracing_events_path);
if (!sys_dir)
return NULL;
for_each_subsystem(sys_dir, sys_dirent, sys_next) {
snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path,
sys_dirent.d_name);
evt_dir = opendir(dir_path);
if (!evt_dir)
continue;
for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
evt_dirent.d_name);
fd = open(evt_path, O_RDONLY);
if (fd < 0)
continue;
if (read(fd, id_buf, sizeof(id_buf)) < 0) {
close(fd);
continue;
}
close(fd);
id = atoll(id_buf);
if (id == config) {
closedir(evt_dir);
closedir(sys_dir);
path = zalloc(sizeof(*path));
path->system = malloc(MAX_EVENT_LENGTH);
if (!path->system) {
free(path);
return NULL;
}
path->name = malloc(MAX_EVENT_LENGTH);
if (!path->name) {
free(path->system);
free(path);
return NULL;
}
strncpy(path->system, sys_dirent.d_name,
MAX_EVENT_LENGTH);
strncpy(path->name, evt_dirent.d_name,
MAX_EVENT_LENGTH);
return path;
}
}