linux c syslog LOG_CONS off 关闭控制台输出
linux c syslog LOG_CONS off
linux c syslog 控制台不输出
openlog("SEC", LOG_PID, LOG_USER);
使用上面的选项打开控制台就不输出日志了。
可用的参数：
option
The option argument to openlog() is an OR of any of these:
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 or POSIX.1-2008.) Print to stderr as well.
LOG_PID
Include PID with each message.
linux c openlog example
Here is an example of openlog, syslog, and closelog:
This example sets the logmask so that debug and informational messages get discarded without ever reaching Syslog. So the second syslog in the example does nothing.
#include <syslog.h>
setlogmask (LOG_UPTO (LOG_NOTICE));
openlog ("exampleprog", LOG_CONS | LOG_PID | LOG_NDELAY, LOG_LOCAL1);
syslog (LOG_NOTICE, "Program started by User %d", getuid ());
syslog (LOG_INFO, "A tree falls in a forest");
closelog ();