#include	<sys/types.h>#include	<time.h>#include	<termios.h>#include	<signal.h>#include 	<pwd.h>#include	<sched.h>#include	<sys/resource.h>#include	<sys/wait.h>#include	<sys/time.h> #include	"dat.h"#include	"fns.h"#include	"error.h" /* glibc 2.3.3-NTPL messes up getpid() by trying to cache the result, so we'll do it ourselves */#include	<sys/syscall.h>#define	getpid()	syscall(SYS_getpid) enum{	DELETE	= 0x7f,	CTRLC	= 'C'-'@',	NSTACKSPERALLOC = 16,	X11STACK=	256*1024};char *hosttype = "Linux"; static void *stackalloc(Proc *p, void **tos);static void stackfreeandexit(void *stack); extern int dflag; int	gidnobody = -1;int	uidnobody = -1;static struct 	termios tinit; voidpexit(char *msg, int t){	Osenv *e;	void *kstack; 	lock(&procs.l);	if(up->prev)		up->prev->next = up->next;	else		procs.head = up->next; 	if(up->next)		up->next->prev = up->prev;	else		procs.tail = up->prev;	unlock(&procs.l); 	if(0)		print("pexit: %s: %s\n", up->text, msg); 	e = up->env;	if(e != nil) {		closefgrp(e->fgrp);		closepgrp(e->pgrp);		closeegrp(e->egrp);		closesigs(e->sigs);	}	kstack = up->kstack;	free(up->prog);	free(up);	if(kstack != nil)		stackfreeandexit(kstack);} voidtramp(void *arg){	Proc *p;	p = arg;	p->pid = p->sigid = getpid();	(*p->func)(p->arg);	pexit("{Tramp}", 0);} intkproc(char *name, void (*func)(void*), void *arg, int flags){	int pid;	Proc *p;	Pgrp *pg;	Fgrp *fg;	Egrp *eg;	void *tos; 	p = newproc();	if(0)		print("start %s:%.8lx\n", name, p);	if(p == nil) {		print("kproc(%s): no memory", name);		return;	} 	if(flags & KPDUPPG) {		pg = up->env->pgrp;		incref(&pg->r);		p->env->pgrp = pg;	}	if(flags & KPDUPFDG) {		fg = up->env->fgrp;		incref(&fg->r);		p->env->fgrp = fg;	}	if(flags & KPDUPENVG) {		eg = up->env->egrp;		incref(&eg->r);		p->env->egrp = eg;	} 	p->env->uid = up->env->uid;	p->env->gid = up->env->gid;	kstrdup(&p->env->user, up->env->user); 	strcpy(p->text, name); 	p->func = func;	p->arg = arg; 	if(flags & KPX11){		p->kstack = nil;	/* never freed; also up not defined */		tos = (char*)mallocz(X11STACK, 0) + X11STACK - sizeof(void*);	}else		p->kstack = stackalloc(p, &tos); 	lock(&procs.l);	if(procs.tail != nil) {		p->prev = procs.tail;		procs.tail->next = p;	}	else {		procs.head = p;		p->prev = nil;	}	procs.tail = p;	unlock(&procs.l); 	if (__clone(tramp, tos, CLONE_PTRACE|CLONE_VM|CLONE_FS|CLONE_FILES|SIGCHLD, p) <= 0)		panic("kproc: clone failed"); 	return 0;} /* * TO DO: * To get pc on trap, use sigaction instead of signal and * examine its siginfo structure */ /*static voiddiserr(char *s, int pc){	char buf[ERRMAX]; 	snprint(buf, sizeof(buf), "%s: pc=0x%lux", s, pc);	disfault(nil, buf);}*/ static voidtrapILL(int signo){	USED(signo);	disfault(nil, "Illegal instruction");} static voidtrapBUS(int signo){	USED(signo);	disfault(nil, "Bus error");} static voidtrapSEGV(int signo){	USED(signo);	disfault(nil, "Segmentation violation");} #include <fpuctl.h>static voidtrapFPE(int signo){	USED(signo);	print("FPU status=0x%.4lux", getfsr());	disfault(nil, "Floating exception");} static voidtrapUSR1(int signo){	int intwait; 	USED(signo); 	intwait = up->intwait;	up->intwait = 0;	/* clear it to let proc continue in osleave */ 	if(up->type != Interp)		/* Used to unblock pending I/O */		return; 	if(intwait == 0)		/* Not posted so it's a sync error */		disfault(nil, Eintr);	/* Should never happen */} /* called to wake up kproc blocked on a syscall */voidoshostintr(Proc *p){	kill(p->sigid, SIGUSR1);} static voidtrapUSR2(int signo){	USED(signo);	/* we've done our work of interrupting sigsuspend */} voidosblock(void){	sigset_t mask; 	sigprocmask(SIG_SETMASK, NULL, &mask);	sigdelset(&mask, SIGUSR2);	sigsuspend(&mask);} voidosready(Proc *p){	if(kill(p->sigid, SIGUSR2) < 0)		fprint(2, "emu: osready failed: pid %d: %s\n", p->sigid, strerror(errno));} voidoslongjmp(void *regs, osjmpbuf env, int val){	USED(regs);	siglongjmp(env, val);} static voidtermset(void){	struct termios t; 	tcgetattr(0, &t);	tinit = t;	t.c_lflag &= ~(ICANON|ECHO|ISIG);	t.c_cc[VMIN] = 1;	t.c_cc[VTIME] = 0;	tcsetattr(0, TCSANOW, &t);} static voidtermrestore(void){	tcsetattr(0, TCSANOW, &tinit);} voidcleanexit(int x){	USED(x); 	if(up->intwait) {		up->intwait = 0;		return;	} 	if(dflag == 0)		termrestore(); 	kill(0, SIGKILL);	exit(0);} voidosreboot(char *file, char **argv){	if(dflag == 0)		termrestore();	execvp(file, argv);	error("reboot failure");} voidlibinit(char *imod){	struct termios t;	struct sigaction act;	sigset_t mask;	struct passwd *pw;	Proc *p;	void *tos;	char sys[64]; 	setsid(); 	gethostname(sys, sizeof(sys));	kstrdup(&ossysname, sys);	pw = getpwnam("nobody");	if(pw != nil) {		uidnobody = pw->pw_uid;		gidnobody = pw->pw_gid;	} 	if(dflag == 0)		termset(); 	memset(&act, 0 , sizeof(act));	act.sa_handler = trapUSR1;	sigaction(SIGUSR1, &act, nil); 	sigemptyset(&mask);	sigaddset(&mask, SIGUSR2);	sigprocmask(SIG_BLOCK, &mask, NULL); 	memset(&act, 0 , sizeof(act));	act.sa_handler = trapUSR2;	sigaction(SIGUSR2, &act, nil); 	act.sa_handler = SIG_IGN;	sigaction(SIGCHLD, &act, nil); 	/*	 * For the correct functioning of devcmd in the	 * face of exiting slaves	 */	signal(SIGPIPE, SIG_IGN);	if(signal(SIGTERM, SIG_IGN) != SIG_IGN)		signal(SIGTERM, cleanexit);	if(signal(SIGINT, SIG_IGN) != SIG_IGN)		signal(SIGINT, cleanexit); 	if(sflag == 0) {		act.sa_handler = trapBUS;		sigaction(SIGBUS, &act, nil);		act.sa_handler = trapILL;		sigaction(SIGILL, &act, nil);		act.sa_handler = trapSEGV;		sigaction(SIGSEGV, &act, nil);		act.sa_handler = trapFPE;		sigaction(SIGFPE, &act, nil);	} 	p = newproc();	p->kstack = stackalloc(p, &tos); 	pw = getpwuid(getuid());	if(pw != nil)		kstrdup(&eve, pw->pw_name);	else		print("cannot getpwuid\n"); 	p->env->uid = getuid();	p->env->gid = getgid(); 	executeonnewstack(tos, emuinit, imod);} intreadkbd(void){	int n;	char buf[1]; 	n = read(0, buf, sizeof(buf));	if(n < 0)		print("keyboard close (n=%d, %s)\n", n, strerror(errno));	if(n <= 0)		pexit("keyboard thread", 0); 	switch(buf[0]) {	case '\r':		buf[0] = '\n';		break;	case DELETE:		buf[0] = 'H' - '@';		break;	case CTRLC:		cleanexit(0);		break;	}	return buf[0];} /* * Return an abitrary millisecond clock time */longosmillisec(void){	static long sec0 = 0, usec0;	struct timeval t; 	if(gettimeofday(&t,(struct timezone*)0)<0)		return 0; 	if(sec0 == 0) {		sec0 = t.tv_sec;		usec0 = t.tv_usec;	}	return (t.tv_sec-sec0)*1000+(t.tv_usec-usec0+500)/1000;} /* * Return the time since the epoch in nanoseconds and microseconds * The epoch is defined at 1 Jan 1970 */vlongosnsec(void){	struct timeval t; 	gettimeofday(&t, nil);	return (vlong)t.tv_sec*1000000000L + t.tv_usec*1000;} vlongosusectime(void){	struct timeval t; 	gettimeofday(&t, nil);	return (vlong)t.tv_sec * 1000000 + t.tv_usec;} intosmillisleep(ulong milsec){	struct  timespec time; 	time.tv_sec = milsec/1000;	time.tv_nsec= (milsec%1000)*1000000;	nanosleep(&time, NULL);	return 0;} intlimbosleep(ulong milsec){	return osmillisleep(milsec);} voidosyield(void){	sched_yield();} voidospause(void){	for(;;)		pause();} voidoslopri(void){	setpriority(PRIO_PROCESS, 0, getpriority(PRIO_PROCESS,0)+4);} static struct {	Lock l;	void *free;} stacklist; static void_stackfree(void *stack){	*((void **)stack) = stacklist.free;	stacklist.free = stack;} static voidstackfreeandexit(void *stack){	lock(&stacklist.l);	_stackfree(stack);	unlockandexit(&stacklist.l.val);} static void *stackalloc(Proc *p, void **tos){	void *rv;	lock(&stacklist.l);	if (stacklist.free == 0) {		int x;

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