Summary
Write a message to the debug serial port.
Declaration
#include <zircon/syscalls.h>
zx_status_t zx_debug_write(const char* buffer, size_t buffer_size);
Description
zx_debug_write() attempts to write data of buffer_size bytes to the debug serial port.
To use the zx_debug_write() function, you must specify
kernel.enable-serial-syscalls=true or
kernel.enable-serial-syscalls=output-only on the kernel command line.
Otherwise, the function returns ZX_ERR_NOT_SUPPORTED.
zx_debug_write is intended for diagnostic use. Data may be dropped or
truncated, but the data from two different zx_debug_write calls will not be
interleaved or reordered.
Rights
None.
Return value
Returns ZX_OK on success.
Errors
ZX_ERR_NOT_SUPPORTED kernel.enable-serial-syscalls is not set to true
or output-only on the kernel command line.
ZX_ERR_INVALID_ARGS buffer is NULL.