#include <u.h>#include <libc.h>#include <gio.h> int fdopen(ReadWriter*);int fdclose(ReadWriter*);long fdread(ReadWriter*, void*, long, vlong);long fdwrite(ReadWriter*, void*, long, vlong); ReadWriter fdrdwr = {	.open = fdopen,	.close = fdclose,	.pread = fdread,	.pwrite = fdwrite,}; intfdopen(ReadWriter *rd){	int *afd = (int*)rd->aux; 	rd->offset = 0;	rd->length = (u64int) seek(*afd, 0, 2);	seek(*afd, 0, 0);	return 0;} intfdclose(ReadWriter *rd){	void *x = rd->aux;	free(x);	return 0;} longfdread(ReadWriter *rd, void *bf, long len, vlong offset){	int *afd = (int*)rd->aux; 	return pread(*afd, bf, len, offset);} longfdwrite(ReadWriter *rd, void *bf, long len, vlong offset){	int *afd = (int*)rd->aux; 	return pwrite(*afd, bf, len, offset);} intfd2gio(int fd){	void *x = malloc(sizeof(int));	memcpy(x, &fd, sizeof(int));	return gopen(&fdrdwr, x);}