Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-28 07:01:32 +00:00
Code Issues Packages Projects Releases Wiki Activity

perf tools: Use readdir() instead of deprecated readdir_r()

Browse Source 
The readdir() function is thread safe as long as just one thread uses a
DIR, which is the case when parsing tracepoint event definitions, to
avoid breaking the build with glibc-2.23.90 (upcoming 2.24), use it
instead of readdir_r().

See: http://man7.org/linux/man-pages/man3/readdir.3.html

"However, in modern implementations (including the glibc implementation),
concurrent calls to readdir() that specify different directory streams
are thread-safe.  In cases where multiple threads must read from the
same directory stream, using readdir() with external synchronization is
still preferable to the use of the deprecated readdir_r(3) function."

Noticed while building on a Fedora Rawhide docker container.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-wddn49r6bz6wq4ee3dxbl7lo@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2016-04-08 11:53:02 -03:00
parent 7093b4c963
commit bfc279f3d2
1 changed files with 30 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
tools/perf/util/parse-events.c
View File

@ -138,11 +138,11 @@ struct event_symbol event_symbols_sw[PERF_COUNT_SW_MAX] = {
#define PERF_EVENT_TYPE(config) __PERF_EVENT_FIELD(config, TYPE) #define PERF_EVENT_TYPE(config) __PERF_EVENT_FIELD(config, TYPE)
#define PERF_EVENT_ID(config) __PERF_EVENT_FIELD(config, EVENT) #define PERF_EVENT_ID(config) __PERF_EVENT_FIELD(config, EVENT)
#define for_each_subsystem(sys_dir, sys_dirent, sys_next) \ #define for_each_subsystem(sys_dir, sys_dirent) \
while (!readdir_r(sys_dir, &sys_dirent, &sys_next) && sys_next) \ while ((sys_dirent = readdir(sys_dir)) != NULL) \
if (sys_dirent.d_type == DT_DIR && \ if (sys_dirent->d_type == DT_DIR && \
(strcmp(sys_dirent.d_name, ".")) && \ (strcmp(sys_dirent->d_name, ".")) && \
(strcmp(sys_dirent.d_name, ".."))) (strcmp(sys_dirent->d_name, "..")))
static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir) static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
{ {
@ -159,12 +159,12 @@ static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
return 0; return 0;
} }
#define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) \ #define for_each_event(sys_dirent, evt_dir, evt_dirent) \
while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next) \ while ((evt_dirent = readdir(evt_dir)) != NULL) \
if (evt_dirent.d_type == DT_DIR && \ if (evt_dirent->d_type == DT_DIR && \
(strcmp(evt_dirent.d_name, ".")) && \ (strcmp(evt_dirent->d_name, ".")) && \
(strcmp(evt_dirent.d_name, "..")) && \ (strcmp(evt_dirent->d_name, "..")) && \
(!tp_event_has_id(&sys_dirent, &evt_dirent))) (!tp_event_has_id(sys_dirent, evt_dirent)))
#define MAX_EVENT_LENGTH 512 #define MAX_EVENT_LENGTH 512
@ -173,7 +173,7 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
{ {
struct tracepoint_path *path = NULL; struct tracepoint_path *path = NULL;
DIR *sys_dir, *evt_dir; DIR *sys_dir, *evt_dir;
struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent; struct dirent *sys_dirent, *evt_dirent;
char id_buf[24]; char id_buf[24];
int fd; int fd;
u64 id; u64 id;
@ -184,18 +184,18 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
if (!sys_dir) if (!sys_dir)
return NULL; return NULL;
for_each_subsystem(sys_dir, sys_dirent, sys_next) { for_each_subsystem(sys_dir, sys_dirent) {
snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path, snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path,
sys_dirent.d_name); sys_dirent->d_name);
evt_dir = opendir(dir_path); evt_dir = opendir(dir_path);
if (!evt_dir) if (!evt_dir)
continue; continue;
for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) { for_each_event(sys_dirent, evt_dir, evt_dirent) {
snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path, snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
evt_dirent.d_name); evt_dirent->d_name);
fd = open(evt_path, O_RDONLY); fd = open(evt_path, O_RDONLY);
if (fd < 0) if (fd < 0)
continue; continue;
@ -220,9 +220,9 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
free(path); free(path);
return NULL; return NULL;
} }
strncpy(path->system, sys_dirent.d_name, strncpy(path->system, sys_dirent->d_name,
MAX_EVENT_LENGTH); MAX_EVENT_LENGTH);
strncpy(path->name, evt_dirent.d_name, strncpy(path->name, evt_dirent->d_name,
MAX_EVENT_LENGTH); MAX_EVENT_LENGTH);
return path; return path;
} }
@ -1812,7 +1812,7 @@ void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
bool name_only) bool name_only)
{ {
DIR *sys_dir, *evt_dir; DIR *sys_dir, *evt_dir;
struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent; struct dirent *sys_dirent, *evt_dirent;
char evt_path[MAXPATHLEN]; char evt_path[MAXPATHLEN];
char dir_path[MAXPATHLEN]; char dir_path[MAXPATHLEN];
char **evt_list = NULL; char **evt_list = NULL;
@ -1830,20 +1830,20 @@ restart:
goto out_close_sys_dir; goto out_close_sys_dir;
} }
for_each_subsystem(sys_dir, sys_dirent, sys_next) { for_each_subsystem(sys_dir, sys_dirent) {
if (subsys_glob != NULL && if (subsys_glob != NULL &&
!strglobmatch(sys_dirent.d_name, subsys_glob)) !strglobmatch(sys_dirent->d_name, subsys_glob))
continue; continue;
snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path, snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path,
sys_dirent.d_name); sys_dirent->d_name);
evt_dir = opendir(dir_path); evt_dir = opendir(dir_path);
if (!evt_dir) if (!evt_dir)
continue; continue;
for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) { for_each_event(sys_dirent, evt_dir, evt_dirent) {
if (event_glob != NULL && if (event_glob != NULL &&
!strglobmatch(evt_dirent.d_name, event_glob)) !strglobmatch(evt_dirent->d_name, event_glob))
continue; continue;
if (!evt_num_known) { if (!evt_num_known) {
@ -1852,7 +1852,7 @@ restart:
} }
snprintf(evt_path, MAXPATHLEN, "%s:%s", snprintf(evt_path, MAXPATHLEN, "%s:%s",
sys_dirent.d_name, evt_dirent.d_name); sys_dirent->d_name, evt_dirent->d_name);
evt_list[evt_i] = strdup(evt_path); evt_list[evt_i] = strdup(evt_path);
if (evt_list[evt_i] == NULL) if (evt_list[evt_i] == NULL)
@ -1905,7 +1905,7 @@ out_close_sys_dir:
int is_valid_tracepoint(const char *event_string) int is_valid_tracepoint(const char *event_string)
{ {
DIR *sys_dir, *evt_dir; DIR *sys_dir, *evt_dir;
struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent; struct dirent *sys_dirent, *evt_dirent;
char evt_path[MAXPATHLEN]; char evt_path[MAXPATHLEN];
char dir_path[MAXPATHLEN]; char dir_path[MAXPATHLEN];
@ -1913,17 +1913,17 @@ int is_valid_tracepoint(const char *event_string)
if (!sys_dir) if (!sys_dir)
return 0; return 0;
for_each_subsystem(sys_dir, sys_dirent, sys_next) { for_each_subsystem(sys_dir, sys_dirent) {
snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path, snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path,
sys_dirent.d_name); sys_dirent->d_name);
evt_dir = opendir(dir_path); evt_dir = opendir(dir_path);
if (!evt_dir) if (!evt_dir)
continue; continue;
for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) { for_each_event(sys_dirent, evt_dir, evt_dirent) {
snprintf(evt_path, MAXPATHLEN, "%s:%s", snprintf(evt_path, MAXPATHLEN, "%s:%s",
sys_dirent.d_name, evt_dirent.d_name); sys_dirent->d_name, evt_dirent->d_name);
if (!strcmp(evt_path, event_string)) { if (!strcmp(evt_path, event_string)) {
closedir(evt_dir); closedir(evt_dir);
closedir(sys_dir); closedir(sys_dir);