Global InformationPrintk information
printk is a C function from the Linux kernel interface that prints messages to the kernel log.[1] It accepts a string parameter called the format string, which specifies a method for rendering an arbitrary number of varied data type parameter(s) into a string.[1] The string is then printed to the kernel log.[1]
It provides a printf-like abstraction and its parsing of the format string and arguments behave similarly to printf.[1] It acts as a debugging tool for kernel programmers who need this function for logging messages from the kernel.[1]
The printk function prototype is:
int printk(const char *fmt, ...);
C standard library and its printf function are unavailable in kernel mode, hence the need for printk.[2]
- ^ a b c d e "Message logging with printk — The Linux Kernel documentation". www.kernel.org. Retrieved 2020-09-09.
- ^ ISO/IEC 9899:2018. International Standards Organization. 2018.