exec 后，地址空间的疑惑

moxies

@folklore 解答的信息量太少。

怎么能把fork的100m 变成1k ？ 拷贝页表是怎么搞定的？

牛儿们，再不来，我就开始吹啦。

moxies

http://en.wikipedia.org/wiki/Fork-exec 看这个文章，同时还说了点别的，摘录如下：

When the child process calls exec(), all data in the original program is lost, and replaced with a running copy of the new program. This is known as overlaying. Although all data are replaced, the file descriptors that were open in the parent are closed only if the program has explicitly marked them close-on-exec. This allows for the common practice of the parent creating a pipe prior to calling fork() and using it to communicate with the executed program.


http://www.chinaunix.net/old_jh/23/62446.html 咱cu上也有过分析。没看过的同学。都来看看。{:3_189:}

moxies

@socay2擦，真刻苦。

你看的那段，好像有个前提就是fork 后 exec 。。。 对也不对？