#include <u.h>#include <libc.h>#include <bio.h> void	ps(char*);void	error(char*);int	cmp(char*, char*); Biobuf	bin; voidmain(int argc, char *argv[]){	int fd, i, n, tot, none = 1;	char dir[500*DIRLEN], *mem; 	USED(argc, argv);	Binit(&bin, 1, OWRITE);	if(chdir("/proc")==-1)		error("/proc");	fd=open(".", OREAD);	if(fd<0)		error("/proc");	mem = sbrk(0);	tot = 0;	while((n = read(fd, dir, sizeof dir)) > 0){		if(brk((void*)(mem + tot + n)) == -1)			error("out of memory");		memmove(mem+tot, dir, n);		tot += n;	}	qsort(mem, tot/DIRLEN, DIRLEN, cmp);	for(i=0; i<tot; i+=DIRLEN){		ps(mem+i);		none = 0;	} 	if(none)		error("no processes; bad #p");	exits(0);} voidps(char *s){	int fd;	char buf[64];	long utime, stime, size;	char status[2*NAMELEN+12+7*12];	char *p; 	sprint(buf, "%s/status", s);	fd = open(buf, OREAD);	if(fd<0)		return;	memset(status, 0, sizeof status);	if(read(fd, status, sizeof status) > 0){		p = strchr(status, ' ');		if(!p)			goto Return;		*p = 0;		p = strchr(status+NAMELEN, ' ');		if(!p)			goto Return;		*p = 0;		status[2*NAMELEN+12-1] = 0;		utime = atol(status+2*NAMELEN+12)/1000;		stime = atol(status+2*NAMELEN+12+1*12)/1000;		size  = atol(status+2*NAMELEN+12+6*12);		Bprint(&bin, "%-8s %6s %4ld:%.2ld %3ld:%.2ld %5ldK %-.8s %s\n",				status+NAMELEN,				s,				utime/60, utime%60,				stime/60, stime%60,				size,				status+2*NAMELEN,				status);	}    Return:	close(fd);} voiderror(char *s){	fprint(2, "ps: %s: ", s);	perror("error");	exits(s);} intcmp(char *a, char *b){	return atoi(a) - atoi(b);}