schedutils: don't apply -a without -p

The unsuspecting user might use taskset -a mask command. Behavior then
is to exec with no affinity applied at all. Better handled by ignoring
all_tasks if no pid was given.

Signed-off-by: Daniel Stodden <daniel.stodden@gmail.com>

diff --git a/schedutils/taskset.c b/schedutils/taskset.c
index aba0b6f9ee02b0bf5069feaa8eab031fd4691944..c2b9ab6f679a46c40c3e37becb5c3831ff9ba61e 100644 (file)
--- a/schedutils/taskset.c
+++ b/schedutils/taskset.c
@@ -217,7 +217,7 @@ int main(int argc, char **argv)
                     argv[optind]);
        }
 
-       if (all_tasks) {
+       if (all_tasks && pid) {
                struct proc_tasks *tasks = proc_open_tasks(pid);
                while (!proc_next_tid(tasks, &ts.pid))
                        do_taskset(&ts, new_setsize, new_set);