usleep            99 libproff/utils.c                         usleep (2000000);
usleep           115 libproff/utils.c                         usleep (2000000);
usleep           130 libproff/utils.c                         usleep (2000000);
usleep           156 libproff/utils.c                         usleep (2000000);
usleep           888 src/xover.c                      usleep (5000); /* doesn't use SIGALRM */