问题
ubuntu下使用man命令查看signal函数
$ man 3 signal
出现
No manual entry for signal in section 3
原因
ubuntu下需要补充安装manpages手册
解决办法
网上搜索后,尝试yum install man-pages,发现ubuntu环境下无法使用yum
$ sudo yum install man-pages
There are no enabled repos.
Run "yum repolist all" to see the repos you have.
You can enable repos with yum-config-manager --enable <repo>
遂使用apt-get
$ sudo apt-get install man-pages
Reading package lists... Done
Building dependency tree
Reading state inf