Function `vprintf`

pub unsafe extern "C" fn vprintf(format: *const u8, valist: *const c_void) -> i32

Print formatted output from a kernel to a host-side output stream.

Syscall arguments:

status: The status value that is returned by vprintf.
format: A pointer to the format specifier input (uses common printf format).
valist: A pointer to the valist input.

# use std::mem::transmute;
#[repr(C)]
struct PrintArgs(f32, f32, f32, i32);

let a = 0.1f32;
let b = 0.2f32;
vprintf(
    "int(%f + %f) = int(%f) = %d\n".as_ptr(),
    transmute(&PrintArgs(a, b, a + b, (a + b) as i32)),
);

Sources: Programming Guide, PTX Interoperability.