/* 8c fdcat.c &&8l -o fdcat fdcat.8 &&cp fdcat $home/bin/386 &&8.out*/#include <u.h>#include <libc.h> int logfd;  voidcat(int f, char *s){	char buf[8192];	long n; 	while((n=read(f, buf, (long)sizeof buf))>0){		fprint(logfd, "%ld %d %s %*s\n", time(0), getpid(), argv0, n, buf);		if(write(1, buf, n)!=n){			fprint(logfd, "%ld %d %s write error copying %s: %r", time(0), getpid(), argv0, s);			sysfatal("write error copying %s: %r", s);		}	}	if(n < 0){		fprint(logfd, "%ld %d %s error reading %s: %r", time(0), getpid(), argv0, s);		sysfatal("error reading %s: %r", s);	}} voidmain(int argc, char *argv[]){	int f, i; 	logfd = open("/tmp/xcpu.log", OWRITE);	argv0 = "cat";	if(argc == 1)		cat(0, "<stdin>");	else for(i=1; i<argc; i++){		f = open(argv[i], OREAD);		if(f < 0)			sysfatal("can't open %s: %r", argv[i]);		else{			cat(f, argv[i]);			close(f);		}	}	exits(0);}