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| author | Rob Landley <rob@landley.net> | 2017-03-21 19:25:33 -0500 |
|---|---|---|
| committer | Rob Landley <rob@landley.net> | 2017-03-21 19:25:33 -0500 |
| commit | e97aeb6dea6ed654d599527c1f1d521e576743b4 (patch) | |
| tree | 577c38f71fa2ae0da453cfebb2e7c0b755a240f4 | |
| parent | 47d07dc1554348b3b3a920627a538bd7164aeb8e (diff) | |
| download | toybox-e97aeb6dea6ed654d599527c1f1d521e576743b4.tar.gz | |
dirtree_flagread() returns DIRTREE_ABORTVAL when the initial node doesn't
exist, which can hit ps when /proc isn't there or /proc/$PID/task isn't
there (because process exited between the time we checked its contents
and the time we looked for its threads).
| -rw-r--r-- | toys/posix/ps.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/toys/posix/ps.c b/toys/posix/ps.c index 41ddf6a4..0d79b5cb 100644 --- a/toys/posix/ps.c +++ b/toys/posix/ps.c @@ -896,6 +896,7 @@ static int get_threads(struct dirtree *new) kcount = TT.kcount; sprintf(toybuf, "/proc/%u/task", pid); new->child = dirtree_flagread(toybuf, DIRTREE_SHUTUP|DIRTREE_PROC, get_ps); + if (new->child == DIRTREE_ABORTVAL) new->child = 0; TT.threadparent = 0; kcount = TT.kcount-kcount+1; tb = (void *)new->extra; @@ -1236,7 +1237,7 @@ void ps_main(void) ((toys.optflags&FLAG_T) || (TT.bits&(_PS_TID|_PS_TCNT))) ? get_threads : get_ps); - if (toys.optflags&(FLAG_k|FLAG_M)) { + if ((dt != DIRTREE_ABORTVAL) && toys.optflags&(FLAG_k|FLAG_M)) { struct carveup **tbsort = collate(TT.kcount, dt); if (toys.optflags&FLAG_M) { @@ -1365,6 +1366,7 @@ static void top_common( dt = dirtree_flagread("/proc", DIRTREE_SHUTUP|DIRTREE_PROC, ((toys.optflags&FLAG_H) || (TT.bits&(_PS_TID|_PS_TCNT))) ? get_threads : get_ps); + if (dt == DIRTREE_ABORTVAL) error_exit("no /proc"); plnew->tb = collate(plnew->count = TT.kcount, dt); TT.kcount = 0; |