tools/testing/selftests/bpf/bpf_rlimit.h

   1 #include <sys/resource.h>
   2 #include <stdio.h>
   3
   4 static  __attribute__((constructor)) void bpf_rlimit_ctor(void)
   5 {
   6         struct rlimit rlim_old, rlim_new = {
   7                 .rlim_cur       = RLIM_INFINITY,
   8                 .rlim_max       = RLIM_INFINITY,
   9         };
  10
  11         getrlimit(RLIMIT_MEMLOCK, &rlim_old);
  12         /* For the sake of running the test cases, we temporarily
  13          * set rlimit to infinity in order for kernel to focus on
  14          * errors from actual test cases and not getting noise
  15          * from hitting memlock limits. The limit is on per-process
  16          * basis and not a global one, hence destructor not really
  17          * needed here.
  18          */
  19         if (setrlimit(RLIMIT_MEMLOCK, &rlim_new) < 0) {
  20                 perror("Unable to lift memlock rlimit");
  21                 /* Trying out lower limit, but expect potential test
  22                  * case failures from this!
  23                  */
  24                 rlim_new.rlim_cur = rlim_old.rlim_cur + (1UL << 20);
  25                 rlim_new.rlim_max = rlim_old.rlim_max + (1UL << 20);
  26                 setrlimit(RLIMIT_MEMLOCK, &rlim_new);
  27         }
  28 }