参考：http://blog.csdn.net/nowayings/article/details/38926501
https://www.cnblogs.com/bonelee/p/6234647.html
打印到日志中：
代码如下
#include<syslog.h> #include <stdio.h> int main(){ FILE*f; f = fopen("abc","r"); if(!f){ syslog(LOG_ERR|LOG_USER,"test -%m/n"); } }
配置如下：添加第2行部分。
ubuntu@ubuntu-vm:~/workspace/log$ vim /etc/rsyslog.d/30-debug.conf
*.debug /var/log/mydebug.log user.* -/var/log/user.log :msg,contains, "logger" ~
运行代码：
ubuntu@ubuntu-vm:~/workspace/log$ ./a.out
ubuntu@ubuntu-vm:~/workspace/log$ cat /var/log/user.log Nov 25 15:30:21 ubuntu-vm a.out: test -No such file or directory/n Nov 25 15:42:59 ubuntu-vm a.out: test -No such file or directory/n
原文：http://www.cnblogs.com/yuguangyuan/p/7895473.html