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perf tools: Use readdir() instead of deprecated readdir_r()
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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 <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Wang Nan <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
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@acmel
acmel committed May 12, 2016
1 parent 7839b9f commit 22a9f41
Showing 1 changed file with 30 additions and 30 deletions.
60 changes: 30 additions & 30 deletions tools/perf/util/parse-events.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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_ID(config) __PERF_EVENT_FIELD(config, EVENT)

#define for_each_subsystem(sys_dir, sys_dirent, sys_next) \
while (!readdir_r(sys_dir, &sys_dirent, &sys_next) && sys_next) \
if (sys_dirent.d_type == DT_DIR && \
(strcmp(sys_dirent.d_name, ".")) && \
(strcmp(sys_dirent.d_name, "..")))
#define for_each_subsystem(sys_dir, sys_dirent) \
while ((sys_dirent = readdir(sys_dir)) != NULL) \
if (sys_dirent->d_type == DT_DIR && \
(strcmp(sys_dirent->d_name, ".")) && \
(strcmp(sys_dirent->d_name, "..")))

static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
{
Expand All @@ -159,12 +159,12 @@ static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
return 0;
}

#define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) \
while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next) \
if (evt_dirent.d_type == DT_DIR && \
(strcmp(evt_dirent.d_name, ".")) && \
(strcmp(evt_dirent.d_name, "..")) && \
(!tp_event_has_id(&sys_dirent, &evt_dirent)))
#define for_each_event(sys_dirent, evt_dir, evt_dirent) \
while ((evt_dirent = readdir(evt_dir)) != NULL) \
if (evt_dirent->d_type == DT_DIR && \
(strcmp(evt_dirent->d_name, ".")) && \
(strcmp(evt_dirent->d_name, "..")) && \
(!tp_event_has_id(sys_dirent, evt_dirent)))

#define MAX_EVENT_LENGTH 512

Expand All @@ -173,7 +173,7 @@ 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;
struct dirent *sys_dirent, *evt_dirent;
char id_buf[24];
int fd;
u64 id;
Expand All @@ -184,18 +184,18 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
if (!sys_dir)
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,
sys_dirent.d_name);
sys_dirent->d_name);
evt_dir = opendir(dir_path);
if (!evt_dir)
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,
evt_dirent.d_name);
evt_dirent->d_name);
fd = open(evt_path, O_RDONLY);
if (fd < 0)
continue;
Expand All @@ -220,9 +220,9 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
free(path);
return NULL;
}
strncpy(path->system, sys_dirent.d_name,
strncpy(path->system, sys_dirent->d_name,
MAX_EVENT_LENGTH);
strncpy(path->name, evt_dirent.d_name,
strncpy(path->name, evt_dirent->d_name,
MAX_EVENT_LENGTH);
return path;
}
Expand Down Expand Up @@ -1812,7 +1812,7 @@ void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
bool name_only)
{
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 dir_path[MAXPATHLEN];
char **evt_list = NULL;
Expand All @@ -1830,20 +1830,20 @@ void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
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 &&
!strglobmatch(sys_dirent.d_name, subsys_glob))
!strglobmatch(sys_dirent->d_name, subsys_glob))
continue;

snprintf(dir_path, MAXPATHLEN, "%s/%s", tracing_events_path,
sys_dirent.d_name);
sys_dirent->d_name);
evt_dir = opendir(dir_path);
if (!evt_dir)
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 &&
!strglobmatch(evt_dirent.d_name, event_glob))
!strglobmatch(evt_dirent->d_name, event_glob))
continue;

if (!evt_num_known) {
Expand All @@ -1852,7 +1852,7 @@ void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
}

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);
if (evt_list[evt_i] == NULL)
Expand Down Expand Up @@ -1905,25 +1905,25 @@ void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
int is_valid_tracepoint(const char *event_string)
{
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 dir_path[MAXPATHLEN];

sys_dir = opendir(tracing_events_path);
if (!sys_dir)
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,
sys_dirent.d_name);
sys_dirent->d_name);
evt_dir = opendir(dir_path);
if (!evt_dir)
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",
sys_dirent.d_name, evt_dirent.d_name);
sys_dirent->d_name, evt_dirent->d_name);
if (!strcmp(evt_path, event_string)) {
closedir(evt_dir);
closedir(sys_dir);
Expand Down

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