bool find_process(const char *name)
{
size_t len = strlen(name);
DIR *dir;
struct dirent *d;
int ret = -1;
dir = opendir(procfs__mountpoint());
if (!dir)
return false;
/* Walk through the directory. */
while (ret && (d = readdir(dir)) != NULL) {
char path[PATH_MAX];
char *data;
size_t size;
if ((d->d_type != DT_DIR) ||
!strcmp(".", d->d_name) ||
!strcmp("..", d->d_name))
continue;
scnprintf(path, sizeof(path), "%s/%s/comm",
procfs__mountpoint(), d->d_name);
if (filename__read_str(path, &data, &size))
continue;
ret = strncmp(name, data, len);
free(data);
}
closedir(dir);
return ret ? false : true;
}
int perf_event_paranoid(void)
{
char path[PATH_MAX];
const char *procfs = procfs__mountpoint();
int value;
if (!procfs)
return INT_MAX;
scnprintf(path, PATH_MAX, "%s/sys/kernel/perf_event_paranoid", procfs);
if (filename__read_int(path, &value))
return INT_MAX;
return value;
}
static int get_comm(char **comm, pid_t pid)
{
char *path;
size_t size;
int err;
if (asprintf(&path, "%s/%d/comm", procfs__mountpoint(), pid) == -1)
return -ENOMEM;
err = filename__read_str(path, comm, &size);
if (!err) {
/*
* We're reading 16 bytes, while filename__read_str
* allocates data per BUFSIZ bytes, so we can safely
* mark the end of the string.
*/
(*comm)[size] = 0;
rtrim(*comm);
}
free(path);
return err;
}