请问6<<3代表什么含义？位操作？

[Brain]

Extract from /usr/include/sys/syslog.h
/*
* Facility codes
*/
#define LOG_KERN (0<<3) /* kernel messages */
#define LOG_USER (1<<3) /* random user-level messages */
#define LOG_MAIL (2<<3) /* mail system */
#define LOG_DAEMON (3<<3) /* system daemons */
#define LOG_AUTH (4<<3) /* security/authorization messages */
#define LOG_SYSLOG (5<<3) /* messages generated internally by syslogd */
#define LOG_LPR (6<<3) /* line printer subsystem */
#define LOG_NEWS (7<<3) /* netnews subsystem */
#define LOG_UUCP (8<<3) /* uucp subsystem */
#define LOG_CRON (15<<3) /* cron/at subsystem */
/* other codes through 15 reserved for system use */
#define LOG_LOCAL0 (16<<3) /* reserved for local use */
#define LOG_LOCAL1 (17<<3) /* reserved for local use */
#define LOG_LOCAL2 (18<<3) /* reserved for local use */
#define LOG_LOCAL3 (19<<3) /* reserved for local use */
#define LOG_LOCAL4 (20<<3) /* reserved for local use */
#define LOG_LOCAL5 (21<<3) /* reserved for local use */
#define LOG_LOCAL6 (22<<3) /* reserved for local use */

[x86]

位操作，左移三位，很基本的知识啊

unsigned short flag = LOG_LOCAL0｜ 5;

那么flag的高15位是16，低三位是5

[Brain]

对，很基本：（很长时间没看过，不清楚了
一阵猛看书后
我在
http://expert.csdn.net/Expert/topic/1159/1159631.xml?temp=.1597101
问了新的问题

[Brain]

感谢感谢！：）

[blh]

6<<3 = 6 * 8