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#pragma once
#include <stddef.h>
enum async_write_status {ASYNC_WRITE_DONE, ASYNC_WRITE_REMAIN, ASYNC_WRITE_ERR};
/*
* Primitive that writes data to a NONBLOCK:ing FD.
*
* _data: points to the beginning of the buffer
* len: total size of the data buffer
* idx: pointer to byte offset into data buffer - writing starts here.
*
* Thus, the total amount of data to write is (len - *idx). *idx is
* updated such that it points to the next unwritten byte in the data
* buffer.
*
* I.e. if the return value is:
* - ASYNC_WRITE_DONE, then the *idx == len.
* - ASYNC_WRITE_REMAIN, then *idx < len
* - ASYNC_WRITE_ERR, there was an error, and no data was written
*/
enum async_write_status async_write(
int fd, const void *data, size_t len, size_t *idx);
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