LOG(9) | Kernel Developer's Manual | LOG(9)

# NAME

`log`, `addlog` — log a message from the kernel through the /dev/klog device

# SYNOPSIS

`#include <sys/syslog.h>`

void
`log`(int level, const char *format, ...);

void
`addlog`(const char *format, ...);

# DESCRIPTION

The `log`() function allows the kernel to send formatted messages to user processes listening on /dev/klog. Usually syslogd(8) monitors /dev/klog for these messages and writes them to a log file.

All messages are formatted using printf(9), logged using facility `LOG_KERN`, and priority level level.

The `addlog`() function is used to build a log message in steps, by adding information to an initial call to `log`().

# SEE ALSO

syslog(3), syslogd(8), printf(9)

September 14, 2015 | Debian