#include <u.h>#include <libc.h>#include <tos.h> static int fd = -1;static struct {	int	pid;	int	fd;} fds[64]; vlongnsec(void){	uchar b[8];	int pid, i, f, tries; 	/*	 * Threaded programs may have multiple procs	 * with different fd tables, so we may need to open	 * /dev/bintime on a per-pid basis	 */ 	/* First, look if we've opened it for this particular pid */	pid = _tos->pid;	for(tries = 0; tries < 3; tries++){		f = -1;		for(i = 0; i < nelem(fds); i++)			if(fds[i].pid == pid){				f = fds[i].fd;				break;			}		if(f < 0){			/* If it's not open for this pid, try the global pid */			if(fd >= 0)				f = fd;			else{				/* must open */				if((f = open("/dev/bintime", OREAD|OCEXEC)) < 0)					return 0;				fd = f;				for(i = 0; i < nelem(fds); i++)					if(fds[i].pid == 0){						fds[i].pid = pid;						fds[i].fd = f;						break;					}			}		}		if(pread(f, b, sizeof b, 0) == sizeof b)			return getbe(b, 8);		close(f);		if(f == fd)			fd = -1;		if(i < nelem(fds)){			fds[i].pid = 0;			fds[i].fd = -1;		}	}	return 0;}