[patch 3/4] Refactor do_syslog interface

This patch breaks out the read operations in do_syslog() into their own functions (klog_read, klog_readhist) and adds a klog_poll. klog_read grows the ability to do a nonblocking read, which I expose in the sys_syslog interface because there doesn't seem to be any reason not to. do_syslog itself i

[patch 3/4] Refactor do_syslog interface

This patch breaks out the read operations in do_syslog() into their own functions (klog_read, klog_readhist) and adds a klog_poll. klog_read grows the ability to do a nonblocking read, which I expose in the sys_syslog interface because there doesn't seem to be any reason not to. do_syslog itself i