Jump to content
Main menu
Main menu
move to sidebar
hide
Navigation
Main page
Recent changes
Random page
freem
Search
Search
Appearance
Create account
Log in
Personal tools
Create account
Log in
Pages for logged out editors
learn more
Contributions
Talk
Editing
Openai/691b01b4-1b64-800b-992e-192d846b72fe
(section)
Add languages
Page
Discussion
English
Read
Edit
Edit source
View history
Tools
Tools
move to sidebar
hide
Actions
Read
Edit
Edit source
View history
General
What links here
Related changes
Special pages
Page information
Appearance
move to sidebar
hide
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
=== Assistant: 对头，哥们，不过稍微精确一点： === 对头，哥们，不过稍微精确一点： 当 alarm(5) 到时，内核会向进程发送 SIGALRM 信号。如果进程正在执行耗时计算，计算会被中断（即暂停当前执行流），然后跳转到你注册的信号处理函数执行自定义逻辑。处理器执行完毕后，进程通常会继续原来的计算，除非处理器里显式退出进程。 下一个问题： dup2(oldfd, newfd) 和直接关闭 newfd 再打开文件有什么本质区别？为什么前者更适合做重定向？
Summary:
Please note that all contributions to freem are considered to be released under the Creative Commons Attribution-ShareAlike 4.0 (see
Freem:Copyrights
for details). If you do not want your writing to be edited mercilessly and redistributed at will, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource.
Do not submit copyrighted work without permission!
Cancel
Editing help
(opens in new window)
