#include <unistd.h>
#include <errno.h>

/* -1: not now (try later), -2: con closed, -3: unexpected error */

int iobase_write(int fd, const void* buf, int len) {
	int res = write(fd, buf, len);
	if (res >= 0) return res;
	switch (errno) {
	case EAGAIN:
#if EAGAIN != EWOULDBLOCK
	case EWOULDBLOCK:
#endif
	case EINTR:
		return -1;
		break;
	case ECONNRESET:
	case EPIPE:
	case ETIMEDOUT:
		return -2;
	default:
		return -3;
	}
}

/* 0: eof, -1: not now (try later), -2: con closed, -3: unexpected error */
int iobase_read(int fd, void* buf, int len) {
	int res = read(fd, buf, len);
	if (res >= 0) return res;
	switch (errno) {
	case EAGAIN:
#if EAGAIN != EWOULDBLOCK
	case EWOULDBLOCK:
#endif
	case EINTR:
		return -1;
		break;
	case ECONNRESET:
	case ETIMEDOUT:
		return -2;
	default:
		return -3;
	}
}