发布时间：2014-11-20 13:35:03
一、制作补丁：diff -urP from-file to-fileIf from-file is a directory and to-file is not, diff compares the file in from-file whose file name is that of to-file, and vice versa.If both from-file and to-file are directories, diff compares corresponding files in both director.........【阅读全文】
发布时间：2014-10-29 18:38:45
1. socket 的阻塞与非阻塞的含义：When the message does not fit into the send buffer of the socket, send() normally blocks, unless the socket has been placed in nonblocking I/O mode. In nonblocking mode it would fail with the error EAGAIN or EWOULDBLOCK in .........【阅读全文】
发布时间：2014-10-28 20:52:36
1. time:系统调用功能：返回从 1970-01-01 00:00:00 到此刻秒数。#include <time.h>time_t time(time_t *t);2. gettimeofday:系统调用功能：返回从 1970-01-01 00:00:00 到此刻秒数和毫秒数（比 time 返回的时间更精准）。#include <sys/time.h>int gettimeofday(struct timeval *tv, struct timezone *tz);struc.........【阅读全文】
发布时间：2014-10-24 23:22:22
僵尸进程并不可怕，可怕的是量大。僵尸进程是有它存在的意义的。以下解释摘自百度百科：由于子进程的结束和父进程的运行是一个异步过程，即父进程永远无法预测子进程 到底什么时候结束. 那么会不会因为父进程太忙来不及wait子进程，或者说不知道 子进程什么时候结束，而丢失子进程结束时的状态信息呢? 不会。因为UNⅨ提供.........【阅读全文】
