linux/tools/perf/util/thread_map.c
Arnaldo Carvalho de Melo 74cf249d5c perf tools: Use zfree to help detect use after free bugs
Several areas already used this technique, so do some audit to
consistently use it elsewhere.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-9sbere0kkplwe45ak6rk4a1f@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-12-27 17:08:19 -03:00

295 lines
5.8 KiB
C

#include <dirent.h>
#include <limits.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "strlist.h"
#include <string.h>
#include "thread_map.h"
#include "util.h"
/* Skip "." and ".." directories */
static int filter(const struct dirent *dir)
{
if (dir->d_name[0] == '.')
return 0;
else
return 1;
}
struct thread_map *thread_map__new_by_pid(pid_t pid)
{
struct thread_map *threads;
char name[256];
int items;
struct dirent **namelist = NULL;
int i;
sprintf(name, "/proc/%d/task", pid);
items = scandir(name, &namelist, filter, NULL);
if (items <= 0)
return NULL;
threads = malloc(sizeof(*threads) + sizeof(pid_t) * items);
if (threads != NULL) {
for (i = 0; i < items; i++)
threads->map[i] = atoi(namelist[i]->d_name);
threads->nr = items;
}
for (i=0; i<items; i++)
zfree(&namelist[i]);
free(namelist);
return threads;
}
struct thread_map *thread_map__new_by_tid(pid_t tid)
{
struct thread_map *threads = malloc(sizeof(*threads) + sizeof(pid_t));
if (threads != NULL) {
threads->map[0] = tid;
threads->nr = 1;
}
return threads;
}
struct thread_map *thread_map__new_by_uid(uid_t uid)
{
DIR *proc;
int max_threads = 32, items, i;
char path[256];
struct dirent dirent, *next, **namelist = NULL;
struct thread_map *threads = malloc(sizeof(*threads) +
max_threads * sizeof(pid_t));
if (threads == NULL)
goto out;
proc = opendir("/proc");
if (proc == NULL)
goto out_free_threads;
threads->nr = 0;
while (!readdir_r(proc, &dirent, &next) && next) {
char *end;
bool grow = false;
struct stat st;
pid_t pid = strtol(dirent.d_name, &end, 10);
if (*end) /* only interested in proper numerical dirents */
continue;
snprintf(path, sizeof(path), "/proc/%s", dirent.d_name);
if (stat(path, &st) != 0)
continue;
if (st.st_uid != uid)
continue;
snprintf(path, sizeof(path), "/proc/%d/task", pid);
items = scandir(path, &namelist, filter, NULL);
if (items <= 0)
goto out_free_closedir;
while (threads->nr + items >= max_threads) {
max_threads *= 2;
grow = true;
}
if (grow) {
struct thread_map *tmp;
tmp = realloc(threads, (sizeof(*threads) +
max_threads * sizeof(pid_t)));
if (tmp == NULL)
goto out_free_namelist;
threads = tmp;
}
for (i = 0; i < items; i++)
threads->map[threads->nr + i] = atoi(namelist[i]->d_name);
for (i = 0; i < items; i++)
zfree(&namelist[i]);
free(namelist);
threads->nr += items;
}
out_closedir:
closedir(proc);
out:
return threads;
out_free_threads:
free(threads);
return NULL;
out_free_namelist:
for (i = 0; i < items; i++)
zfree(&namelist[i]);
free(namelist);
out_free_closedir:
zfree(&threads);
goto out_closedir;
}
struct thread_map *thread_map__new(pid_t pid, pid_t tid, uid_t uid)
{
if (pid != -1)
return thread_map__new_by_pid(pid);
if (tid == -1 && uid != UINT_MAX)
return thread_map__new_by_uid(uid);
return thread_map__new_by_tid(tid);
}
static struct thread_map *thread_map__new_by_pid_str(const char *pid_str)
{
struct thread_map *threads = NULL, *nt;
char name[256];
int items, total_tasks = 0;
struct dirent **namelist = NULL;
int i, j = 0;
pid_t pid, prev_pid = INT_MAX;
char *end_ptr;
struct str_node *pos;
struct strlist *slist = strlist__new(false, pid_str);
if (!slist)
return NULL;
strlist__for_each(pos, slist) {
pid = strtol(pos->s, &end_ptr, 10);
if (pid == INT_MIN || pid == INT_MAX ||
(*end_ptr != '\0' && *end_ptr != ','))
goto out_free_threads;
if (pid == prev_pid)
continue;
sprintf(name, "/proc/%d/task", pid);
items = scandir(name, &namelist, filter, NULL);
if (items <= 0)
goto out_free_threads;
total_tasks += items;
nt = realloc(threads, (sizeof(*threads) +
sizeof(pid_t) * total_tasks));
if (nt == NULL)
goto out_free_namelist;
threads = nt;
for (i = 0; i < items; i++) {
threads->map[j++] = atoi(namelist[i]->d_name);
zfree(&namelist[i]);
}
threads->nr = total_tasks;
free(namelist);
}
out:
strlist__delete(slist);
return threads;
out_free_namelist:
for (i = 0; i < items; i++)
zfree(&namelist[i]);
free(namelist);
out_free_threads:
zfree(&threads);
goto out;
}
static struct thread_map *thread_map__new_by_tid_str(const char *tid_str)
{
struct thread_map *threads = NULL, *nt;
int ntasks = 0;
pid_t tid, prev_tid = INT_MAX;
char *end_ptr;
struct str_node *pos;
struct strlist *slist;
/* perf-stat expects threads to be generated even if tid not given */
if (!tid_str) {
threads = malloc(sizeof(*threads) + sizeof(pid_t));
if (threads != NULL) {
threads->map[0] = -1;
threads->nr = 1;
}
return threads;
}
slist = strlist__new(false, tid_str);
if (!slist)
return NULL;
strlist__for_each(pos, slist) {
tid = strtol(pos->s, &end_ptr, 10);
if (tid == INT_MIN || tid == INT_MAX ||
(*end_ptr != '\0' && *end_ptr != ','))
goto out_free_threads;
if (tid == prev_tid)
continue;
ntasks++;
nt = realloc(threads, sizeof(*threads) + sizeof(pid_t) * ntasks);
if (nt == NULL)
goto out_free_threads;
threads = nt;
threads->map[ntasks - 1] = tid;
threads->nr = ntasks;
}
out:
return threads;
out_free_threads:
zfree(&threads);
goto out;
}
struct thread_map *thread_map__new_str(const char *pid, const char *tid,
uid_t uid)
{
if (pid)
return thread_map__new_by_pid_str(pid);
if (!tid && uid != UINT_MAX)
return thread_map__new_by_uid(uid);
return thread_map__new_by_tid_str(tid);
}
void thread_map__delete(struct thread_map *threads)
{
free(threads);
}
size_t thread_map__fprintf(struct thread_map *threads, FILE *fp)
{
int i;
size_t printed = fprintf(fp, "%d thread%s: ",
threads->nr, threads->nr > 1 ? "s" : "");
for (i = 0; i < threads->nr; ++i)
printed += fprintf(fp, "%s%d", i ? ", " : "", threads->map[i]);
return printed + fprintf(fp, "\n");
}