c - C代码中的syslog命令

#include<syslog.h>
syslog(LOG_INFO, "Start logging");

上面的syslog命令没有登录到syslog中。所以我试着，

openlog("Logs", "", LOG_USER);
syslog(LOG_INFO, "Start logging");
closelog();

这无法记录任何内容，我得到以下错误：

syslog: unknown facility/priority: 8049584

最佳答案

这一行错了：

openlog("vyatta-conntrack", "", LOG_USER);

“”应该是整数：

void openlog(const char *ident, int option, int facility);

整数应该是这些常量中的任意一个或在一起：

   LOG_CONS       Write directly to system console if there is
                  an error while sending to system logger.

   LOG_NDELAY     Open the connection immediately (normally, the
                  connection is opened when the first message is
                  logged).

   LOG_NOWAIT     Don't wait for child processes that may have
                  been created while logging the message.  (The
                  GNU C library does not create a child process,
                  so this option has no effect on Linux.)

   LOG_ODELAY     The converse of LOG_NDELAY; opening of the
                  connection is delayed until syslog() is
                  called.  (This is the default, and need not be
                  specified.)

   LOG_PERROR     (Not in POSIX.1-2001.)  Print to stderr as
                  well.

   LOG_PID        Include PID with each message.

再试一次，类似于：

openlog("vyatta-conntrack", LOG_PID, LOG_USER);

注意，您的syslogd配置可能没有设置为保留日志级别LOG_INFO的消息。尝试LOG_ALERT或其他方法来调试此问题——如果它有效，则返回LOG_INFO并配置syslogd以保留要保留的日志消息。添加一行如下：

*.* /var/log/all_messages.log

将完成rsyslogd(8)的工作。如果您的系统使用rsyslog.conf(5)，请务必阅读rsyslogd(8)手册页。如果您的系统使用不同的系统日志守护程序，请查看系统的手册页以了解详细信息。