struct timeval

http://groups.google.co.jp/groups?dq=&hl=ja&lr=&ie=UTF-8&threadm=3990310news.pl%40insigna.ie.u-ryukyu.ac.jp&prev=/groups%3Fhl%3Dja%26lr%3D%26ie%3DUTF-8%26group%3Dfj.comp.lang.c

googleにはまだ全部きてないみたい...。