#include <IOKit/system.h>

IOKit/system.h Kernel.framework

Must be before other includes of kern/assert.h

includes: sys/cdefs.h, kern/thread.h, Kernel/stdarg.h, Kernel/stdint.h, Kernel/string.h, IOKit/assert.h, kern/debug.h, kern/task.h, kern/sched_prim.h, kern/locks.h, kern/queue.h, kern/ipc_mig.h, libkern/libkern.h, mach/mach_types.h, mach/mach_interface.h, mach/memory_object_types.h, kern/kern_types.h

1 function

function_doprnt

extern void _doprnt(const char *format, va_list *arg, void (*lputc)(char), int radix)

▾

claude-fable-5, 2026-08-24 · not from Apple sources · verified against xnu osfmk/kern/printf.c

Common formatting engine for the kernel printf family, from CMU Mach. Formats format with the arguments at *argp, emitting each character through the lputc routine. Supports the standard integer, character and string conversions plus kernel extensions: %b (decoded register bits), %D (hex dump with separator), %r/%n (signed/unsigned in the default radix given by the radix parameter; kernel callers pass 16). Floating point is not supported. Used to build printf, kprintf and the paniclog writers.