diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-04-08 11:31:24 -0300 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2018-11-20 18:06:04 +0000 |
| commit | 8f7cfa5be5a15f7e299eece39f67b09a46345477 (patch) | |
| tree | 6cee9c77f0924e0a618cb7fe6ca64f17c2719645 /tools | |
| parent | d7c288316164259002f6bf7441b12dd215f956ab (diff) | |
perf thread_map: Use readdir() instead of deprecated readdir_r()
commit 3354cf71104de49326d19d2f9bdb1f66eea52ef4 upstream.
The readdir() function is thread safe as long as just one thread uses a
DIR, which is the case in thread_map, so, 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-del8h2a0f40z75j4r42l96l0@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/thread_map.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/tools/perf/util/thread_map.c b/tools/perf/util/thread_map.c index 5d3215912105..07e8a85282e9 100644 --- a/tools/perf/util/thread_map.c +++ b/tools/perf/util/thread_map.c @@ -64,7 +64,7 @@ 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 dirent *dirent, **namelist = NULL; struct thread_map *threads = malloc(sizeof(*threads) + max_threads * sizeof(pid_t)); if (threads == NULL) @@ -76,16 +76,16 @@ struct thread_map *thread_map__new_by_uid(uid_t uid) threads->nr = 0; - while (!readdir_r(proc, &dirent, &next) && next) { + while ((dirent = readdir(proc)) != NULL) { char *end; bool grow = false; struct stat st; - pid_t pid = strtol(dirent.d_name, &end, 10); + 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); + snprintf(path, sizeof(path), "/proc/%s", dirent->d_name); if (stat(path, &st) != 0) continue; |