[unix-history] / usr / src / sys / kern / kern_proc.c

/*	kern_proc.c	4.31	82/08/11	*/

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/map.h"
#include "../h/mtpr.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/proc.h"
#include "../h/buf.h"
#include "../h/reg.h"
#include "../h/inode.h"
#include "../h/seg.h"
#include "../h/acct.h"
#include "/usr/include/wait.h"
#include "../h/pte.h"
#include "../h/vm.h"
#include "../h/text.h"
#include "../h/psl.h"
#include "../h/vlimit.h"
#include "../h/file.h"
#include "../h/quota.h"
#include "../h/descrip.h"
#include "../h/uio.h"

/*
 * exec system call, with and without environments.
 */
struct execa {
	char	*fname;
	char	**argp;
	char	**envp;
};

exec()
{
	((struct execa *)u.u_ap)->envp = NULL;
	exece();
}

exece()
{
	register nc;
	register char *cp;
	register struct buf *bp;
	register struct execa *uap;
	int na, ne, ucp, ap, c;
	int indir, uid, gid;
	char *sharg;
	struct inode *ip;
	swblk_t bno;
	char cfname[MAXNAMLEN + 1];
	char cfarg[SHSIZE];
	struct uio uio;
	struct iovec iovec;

	if ((ip = namei(uchar, 0, 1)) == NULL)
		return;
	bno = 0;
	bp = 0;
	indir = 0;
	uid = u.u_uid;
	gid = u.u_gid;
	if (ip->i_mode & ISUID)
		uid = ip->i_uid;
	if (ip->i_mode & ISGID)
		gid = ip->i_gid;

  again:
	if (access(ip, IEXEC))
		goto bad;
	if ((u.u_procp->p_flag&STRC) && access(ip, IREAD))
		goto bad;
	if ((ip->i_mode & IFMT) != IFREG ||
	   (ip->i_mode & (IEXEC|(IEXEC>>3)|(IEXEC>>6))) == 0) {
		u.u_error = EACCES;
		goto bad;
	}

	/*
	 * Read in first few bytes of file for segment sizes, ux_mag:
	 *	407 = plain executable
	 *	410 = RO text
	 *	413 = demand paged RO text
	 * Also an ASCII line beginning with #! is
	 * the file name of a ``shell'' and arguments may be prepended
	 * to the argument list if given here.
	 *
	 * SHELL NAMES ARE LIMITED IN LENGTH.
	 *
	 * ONLY ONE ARGUMENT MAY BE PASSED TO THE SHELL FROM
	 * THE ASCII LINE.
	 */
	uio.uio_iov = &iovec;
	uio.uio_iovcnt = 1;
	iovec.iov_base = (caddr_t)&u.u_exdata;
	iovec.iov_len = sizeof (u.u_exdata);
	uio.uio_offset = 0;
	uio.uio_segflg = 1;
	u.u_error = readip(ip, &uio);
	if (u.u_error)
		goto bad;
	u.u_count = uio.uio_resid;
	if (u.u_count > sizeof(u.u_exdata) - sizeof(u.u_exdata.Ux_A) &&
	    u.u_exdata.ux_shell[0] != '#') {
		u.u_error = ENOEXEC;
		goto bad;
	}
	switch (u.u_exdata.ux_mag) {

	case 0407:
		u.u_exdata.ux_dsize += u.u_exdata.ux_tsize;
		u.u_exdata.ux_tsize = 0;
		break;

	case 0413:
	case 0410:
		if (u.u_exdata.ux_tsize == 0) {
			u.u_error = ENOEXEC;
			goto bad;
		}
		break;

	default:
		if (u.u_exdata.ux_shell[0] != '#' ||
		    u.u_exdata.ux_shell[1] != '!' ||
		    indir) {
			u.u_error = ENOEXEC;
			goto bad;
		}
		cp = &u.u_exdata.ux_shell[2];		/* skip "#!" */
		while (cp < &u.u_exdata.ux_shell[SHSIZE]) {
			if (*cp == '\t')
				*cp = ' ';
			else if (*cp == '\n') {
				*cp = '\0';
				break;
			}
			cp++;
		}
		if (*cp != '\0') {
			u.u_error = ENOEXEC;
			goto bad;
		}
		cp = &u.u_exdata.ux_shell[2];
		while (*cp == ' ')
			cp++;
		u.u_dirp = cp;
		while (*cp && *cp != ' ')
			cp++;
		sharg = NULL;
		if (*cp) {
			*cp++ = '\0';
			while (*cp == ' ')
				cp++;
			if (*cp) {
				bcopy((caddr_t)cp, (caddr_t)cfarg, SHSIZE);
				sharg = cfarg;
			}
		}
		bcopy((caddr_t)u.u_dent.d_name, (caddr_t)cfname,
		    u.u_dent.d_namlen + 1);
		indir = 1;
		iput(ip);
		ip = namei(schar, 0, 1);
		if (ip == NULL)
			return;
		goto again;
	}

	/*
	 * Collect arguments on "file" in swap space.
	 */
	na = 0;
	ne = 0;
	nc = 0;
	uap = (struct execa *)u.u_ap;
	if ((bno = rmalloc(argmap, ctod(clrnd((int) btoc(NCARGS))))) == 0) {
		swkill(u.u_procp, "exece");
		goto bad;
	}
	if (bno % CLSIZE)
		panic("execa rmalloc");
	if (uap->argp) for (;;) {
		ap = NULL;
		if (indir && (na == 1 || na == 2 && sharg))
			ap = (int)uap->fname;
		else if (uap->argp) {
			ap = fuword((caddr_t)uap->argp);
			uap->argp++;
		}
		if (ap==NULL && uap->envp) {
			uap->argp = NULL;
			if ((ap = fuword((caddr_t)uap->envp)) == NULL)
				break;
			uap->envp++;
			ne++;
		}
		if (ap == NULL)
			break;
		na++;
		if (ap == -1)
			u.u_error = EFAULT;
		do {
			if (nc >= NCARGS-1)
				u.u_error = E2BIG;
			if (indir && na == 2 && sharg != NULL)
				c = *sharg++ & 0377;
			else if ((c = fubyte((caddr_t)ap++)) < 0)
				u.u_error = EFAULT;
			if (u.u_error) {
				if (bp)
					brelse(bp);
				bp = 0;
				goto badarg;
			}
			if (nc % (CLSIZE*NBPG) == 0) {
				if (bp)
					bdwrite(bp);
				bp = getblk(argdev, bno + nc / NBPG,
				    CLSIZE*NBPG);
				cp = bp->b_un.b_addr;
			}
			nc++;
			*cp++ = c;
		} while (c > 0);
	}
	if (bp)
		bdwrite(bp);
	bp = 0;
	nc = (nc + NBPW-1) & ~(NBPW-1);
	if (indir) {
		u.u_dent.d_namlen = strlen(cfname);
		bcopy((caddr_t)cfname, (caddr_t)u.u_dent.d_name,
		    u.u_dent.d_namlen + 1);
	}
	getxfile(ip, nc + (na+4)*NBPW, uid, gid);
	if (u.u_error) {
badarg:
		for (c = 0; c < nc; c += CLSIZE*NBPG)
			if (bp = baddr(argdev, bno + c / NBPG, CLSIZE*NBPG)) {
				bp->b_flags |= B_AGE;		/* throw away */
				bp->b_flags &= ~B_DELWRI;	/* cancel io */
				brelse(bp);
				bp = 0;
			}
		goto bad;
	}

	/*
	 * copy back arglist
	 */
	ucp = USRSTACK - nc - NBPW;
	ap = ucp - na*NBPW - 3*NBPW;
	u.u_ar0[SP] = ap;
	(void) suword((caddr_t)ap, na-ne);
	nc = 0;
	for (;;) {
		ap += NBPW;
		if (na==ne) {
			(void) suword((caddr_t)ap, 0);
			ap += NBPW;
		}
		if (--na < 0)
			break;
		(void) suword((caddr_t)ap, ucp);
		do {
			if (nc % (CLSIZE*NBPG) == 0) {
				if (bp)
					brelse(bp);
				bp = bread(argdev, bno + nc / NBPG,
				    CLSIZE*NBPG);
				bp->b_flags |= B_AGE;		/* throw away */
				bp->b_flags &= ~B_DELWRI;	/* cancel io */
				cp = bp->b_un.b_addr;
			}
			(void) subyte((caddr_t)ucp++, (c = *cp++));
			nc++;
		} while(c&0377);
	}
	(void) suword((caddr_t)ap, 0);
	(void) suword((caddr_t)ucp, 0);
	setregs();
bad:
	if (bp)
		brelse(bp);
	if (bno)
		rmfree(argmap, ctod(clrnd((int) btoc(NCARGS))), bno);
	iput(ip);
}

/*
 * Read in and set up memory for executed file.
 */
getxfile(ip, nargc, uid, gid)
register struct inode *ip;
{
	register size_t ts, ds, ss;
	int pagi;

	if (u.u_exdata.ux_mag == 0413)
		pagi = SPAGI;
	else
		pagi = 0;
	if (u.u_exdata.ux_tsize!=0 && (ip->i_flag&ITEXT)==0 &&
	    ip->i_count!=1) {
		register struct file *fp;

		for (fp = file; fp < fileNFILE; fp++) {
			if (fp->f_type == DTYPE_FILE &&
			    fp->f_inode == ip && (fp->f_flag&FWRITE)) {
				u.u_error = ETXTBSY;
				goto bad;
			}
		}
	}

	/*
	 * Compute text and data sizes and make sure not too large.
	 */
	ts = clrnd(btoc(u.u_exdata.ux_tsize));
	ds = clrnd(btoc((u.u_exdata.ux_dsize+u.u_exdata.ux_bsize)));
	ss = clrnd(SSIZE + btoc(nargc));
	if (chksize(ts, ds, ss))
		goto bad;

	/*
	 * Make sure enough space to start process.
	 */
	u.u_cdmap = zdmap;
	u.u_csmap = zdmap;
	if (swpexpand(ds, ss, &u.u_cdmap, &u.u_csmap) == NULL)
		goto bad;

	/*
	 * At this point, committed to the new image!
	 * Release virtual memory resources of old process, and
	 * initialize the virtual memory of the new process.
	 * If we resulted from vfork(), instead wakeup our
	 * parent who will set SVFDONE when he has taken back
	 * our resources.
	 */
	u.u_prof.pr_scale = 0;
	if ((u.u_procp->p_flag & SVFORK) == 0)
		vrelvm();
	else {
		u.u_procp->p_flag &= ~SVFORK;
		u.u_procp->p_flag |= SKEEP;
		wakeup((caddr_t)u.u_procp);
		while ((u.u_procp->p_flag & SVFDONE) == 0)
			sleep((caddr_t)u.u_procp, PZERO - 1);
		u.u_procp->p_flag &= ~(SVFDONE|SKEEP);
	}
	u.u_procp->p_flag &= ~(SPAGI|SSEQL|SUANOM|SNUSIG);
	u.u_procp->p_flag |= pagi;
	u.u_dmap = u.u_cdmap;
	u.u_smap = u.u_csmap;
	vgetvm(ts, ds, ss);

	if (pagi == 0) {
		/*
		 * Read in data segment.
		 */
		u.u_base = (char *)ctob(ts);
		u.u_offset = sizeof(u.u_exdata)+u.u_exdata.ux_tsize;
		u.u_count = u.u_exdata.ux_dsize;
		readi(ip);
	}
	xalloc(ip, pagi);
	if (pagi && u.u_procp->p_textp)
		vinifod((struct fpte *)dptopte(u.u_procp, 0),
		    PG_FTEXT, u.u_procp->p_textp->x_iptr,
		    1 + ts/CLSIZE, (int)btoc(u.u_exdata.ux_dsize));

	/* THIS SHOULD BE DONE AT A LOWER LEVEL, IF AT ALL */
	mtpr(TBIA, 0);

	if (u.u_error)
		swkill(u.u_procp, "i/o error mapping pages");
	/*
	 * set SUID/SGID protections, if no tracing
	 */
	if ((u.u_procp->p_flag&STRC)==0) {
		u.u_uid = uid;
		u.u_procp->p_uid = uid;
		u.u_gid = gid;
		u.u_grps[gid/(sizeof(int)*8)] |= 1 << (gid%(sizeof(int)*8));
	} else
		psignal(u.u_procp, SIGTRAP);
	u.u_tsize = ts;
	u.u_dsize = ds;
	u.u_ssize = ss;
bad:
	return;
}

/*
 * Clear registers on exec
 */
setregs()
{
	register int (**rp)();
	register i;
	long sigmask;

	for (rp = &u.u_signal[1], sigmask = 1L; rp < &u.u_signal[NSIG];
	    sigmask <<= 1, rp++) {
		switch (*rp) {

		case SIG_IGN:
		case SIG_DFL:
		case SIG_HOLD:
			continue;

		default:
			/*
			 * Normal or deferring catch; revert to default.
			 */
			(void) spl6();
			*rp = SIG_DFL;
			if ((int)*rp & 1)
				u.u_procp->p_siga0 |= sigmask;
			else
				u.u_procp->p_siga0 &= ~sigmask;
			if ((int)*rp & 2)
				u.u_procp->p_siga1 |= sigmask;
			else
				u.u_procp->p_siga1 &= ~sigmask;
			(void) spl0();
			continue;
		}
	}
/*
	for (rp = &u.u_ar0[0]; rp < &u.u_ar0[16];)
		*rp++ = 0;
*/
	u.u_ar0[PC] = u.u_exdata.ux_entloc + 2; /* skip over entry mask */
	for (i=0; i<NOFILE; i++) {
		if (u.u_pofile[i]&EXCLOSE) {
			closef(u.u_ofile[i], 1, u.u_pofile[i]);
			u.u_ofile[i] = NULL;
			u.u_pofile[i] = 0;
		}
	}

	/*
	 * Remember file name for accounting.
	 */
	u.u_acflag &= ~AFORK;
	bcopy((caddr_t)u.u_dent.d_name, (caddr_t)u.u_comm,
	    u.u_dent.d_namlen + 1);
}

/*
 * Exit system call: pass back caller's arg
 */
rexit()
{
	register struct a {
		int	rval;
	} *uap;

	uap = (struct a *)u.u_ap;
	exit((uap->rval & 0377) << 8);
}

/*
 * Release resources.
 * Save u. area for parent to look at.
 * Enter zombie state.
 * Wake up parent and init processes,
 * and dispose of children.
 */
exit(rv)
{
	register int i;
	register struct proc *p, *q;
	register int x;

#ifdef PGINPROF
	vmsizmon();
#endif
	p = u.u_procp;
	p->p_flag &= ~(STRC|SULOCK);
	p->p_flag |= SWEXIT;
	p->p_clktim = 0;
	(void) spl6();
	if ((int)SIG_IGN & 1)
		p->p_siga0 = ~0;
	else
		p->p_siga0 = 0;
	if ((int)SIG_IGN & 2)
		p->p_siga1 = ~0;
	else
		p->p_siga1 = 0;
	(void) spl0();
	p->p_cpticks = 0;
	p->p_pctcpu = 0;
	for (i=0; i<NSIG; i++)
		u.u_signal[i] = SIG_IGN;
	/*
	 * Release virtual memory.  If we resulted from
	 * a vfork(), instead give the resources back to
	 * the parent.
	 */
	if ((p->p_flag & SVFORK) == 0)
		vrelvm();
	else {
		p->p_flag &= ~SVFORK;
		wakeup((caddr_t)p);
		while ((p->p_flag & SVFDONE) == 0)
			sleep((caddr_t)p, PZERO - 1);
		p->p_flag &= ~SVFDONE;
	}
	for (i = 0; i < NOFILE; i++) {
#ifdef notdef
		/* why was this like this? */
		f = u.u_ofile[i];
		u.u_ofile[i] = NULL;
		closef(f, 1);
#else
		closef(u.u_ofile[i], 1, u.u_pofile[i]);
		u.u_ofile[i] = NULL;
		u.u_pofile[i] = 0;
#endif
	}
	ilock(u.u_cdir);
	iput(u.u_cdir);
	if (u.u_rdir) {
		ilock(u.u_rdir);
		iput(u.u_rdir);
	}
	u.u_limit[LIM_FSIZE] = INFINITY;
	acct();
#ifdef QUOTA
	qclean();
#endif
	vrelpt(u.u_procp);
	vrelu(u.u_procp, 0);
	(void) spl5();		/* hack for mem alloc race XXX */
	multprog--;
	p->p_stat = SZOMB;
	noproc = 1;
	i = PIDHASH(p->p_pid);
	x = p - proc;
	if (pidhash[i] == x)
		pidhash[i] = p->p_idhash;
	else {
		for (i = pidhash[i]; i != 0; i = proc[i].p_idhash)
			if (proc[i].p_idhash == x) {
				proc[i].p_idhash = p->p_idhash;
				goto done;
			}
		panic("exit");
	}
	if (p->p_pid == 1)
		panic("init died");
done:
	((struct xproc *)p)->xp_xstat = rv;		/* overlay */
	((struct xproc *)p)->xp_vm = u.u_vm;		/* overlay */
	vmsadd(&((struct xproc *)p)->xp_vm, &u.u_cvm);
	for (q = proc; q < procNPROC; q++)
		if (q->p_pptr == p) {
			if (q->p_osptr)
				q->p_osptr->p_ysptr = q->p_ysptr;
			if (q->p_ysptr)
				q->p_ysptr->p_osptr = q->p_osptr;
			if (proc[1].p_cptr)
				proc[1].p_cptr->p_ysptr = q;
			q->p_osptr = proc[1].p_cptr;
			q->p_ysptr = NULL;
			proc[1].p_cptr = q;

			q->p_pptr = &proc[1];
			q->p_ppid = 1;
			wakeup((caddr_t)&proc[1]);
			/*
			 * Traced processes are killed
			 * since their existence means someone is screwing up.
			 * Stopped processes are sent a hangup and a continue.
			 * This is designed to be ``safe'' for setuid
			 * processes since they must be willing to tolerate
			 * hangups anyways.
			 */
			if (q->p_flag&STRC) {
				q->p_flag &= ~STRC;
				psignal(q, SIGKILL);
			} else if (q->p_stat == SSTOP) {
				psignal(q, SIGHUP);
				psignal(q, SIGCONT);
			}
			/*
			 * Protect this process from future
			 * tty signals, clear TSTP/TTIN/TTOU if pending.
			 */
			(void) spgrp(q, -1);
		}
	psignal(p->p_pptr, SIGCHLD);
	wakeup((caddr_t)p->p_pptr);
	swtch();
}

wait()
{
	struct vtimes vm;
	struct vtimes *vp;

	if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) {
		wait1(0, (struct vtimes *)0);
		return;
	}
	vp = (struct vtimes *)u.u_ar0[R1];
	wait1(u.u_ar0[R0], &vm);
	if (u.u_error)
		return;
	(void) copyout((caddr_t)&vm, (caddr_t)vp, sizeof (struct vtimes));
}

/*
 * Wait system call.
 * Search for a terminated (zombie) child,
 * finally lay it to rest, and collect its status.
 * Look also for stopped (traced) children,
 * and pass back status from them.
 */
wait1(options, vp)
	register options;
	struct vtimes *vp;
{
	register f;
	register struct proc *p, *q;

	f = 0;
loop:
	for (p = proc; p < procNPROC; p++)
	if (p->p_pptr == u.u_procp) {
		f++;
		if (p->p_stat == SZOMB) {
			u.u_r.r_val1 = p->p_pid;
			u.u_r.r_val2 = ((struct xproc *)p)->xp_xstat;
			((struct xproc *)p)->xp_xstat = 0;
			if (vp)
				*vp = ((struct xproc *)p)->xp_vm;
			vmsadd(&u.u_cvm, &((struct xproc *)p)->xp_vm);
			((struct xproc *)p)->xp_vm = zvms;
			p->p_stat = NULL;
			p->p_pid = 0;
			p->p_ppid = 0;
			if (q = p->p_ysptr)
				q->p_osptr = p->p_osptr;
			if (q = p->p_osptr)
				q->p_ysptr = p->p_ysptr;
			if ((q = p->p_pptr)->p_cptr == p)
				q->p_cptr = p->p_osptr;
			p->p_pptr = 0;
			p->p_ysptr = 0;
			p->p_osptr = 0;
			p->p_cptr = 0;
			p->p_sig = 0;
			p->p_siga0 = 0;
			p->p_siga1 = 0;
			p->p_pgrp = 0;
			p->p_flag = 0;
			p->p_wchan = 0;
			p->p_cursig = 0;
			return;
		}
		if (p->p_stat == SSTOP && (p->p_flag&SWTED)==0 &&
		    (p->p_flag&STRC || options&WUNTRACED)) {
			p->p_flag |= SWTED;
			u.u_r.r_val1 = p->p_pid;
			u.u_r.r_val2 = (p->p_cursig<<8) | WSTOPPED;
			return;
		}
	}
	if (f==0) {
		u.u_error = ECHILD;
		return;
	}
	if (options&WNOHANG) {
		u.u_r.r_val1 = 0;
		return;
	}
	if ((u.u_procp->p_flag&SNUSIG) && setjmp(u.u_qsav)) {
		u.u_eosys = RESTARTSYS;
		return;
	}
	sleep((caddr_t)u.u_procp, PWAIT);
	goto loop;
}

/*
 * fork system call.
 */
fork()
{

	u.u_cdmap = zdmap;
	u.u_csmap = zdmap;
	if (swpexpand(u.u_dsize, u.u_ssize, &u.u_cdmap, &u.u_csmap) == 0) {
		u.u_r.r_val2 = 0;
		return;
	}
	fork1(0);
}

fork1(isvfork)
{
	register struct proc *p1, *p2;
#ifndef	QUOTA
	register a;

	a = 0;
#else
	if (u.u_quota != NOQUOT && u.u_quota->q_plim &&
	    u.u_quota->q_cnt >= u.u_quota->q_plim) {
		u.u_error = EPROCLIM;
		return;
	}
#endif
	p2 = NULL;
	for (p1 = proc; p1 < procNPROC; p1++) {
#ifdef QUOTA
		if (p1->p_stat == NULL) {
			p2 = p1;
			break;
		}
#else
		if (p1->p_stat==NULL && p2==NULL)
			p2 = p1;
		else {
			if (p1->p_uid==u.u_uid && p1->p_stat!=NULL)
				a++;
		}
#endif
	}
	/*
	 * Disallow if
	 *  No processes at all;
	 *  not su and too many procs owned; or
	 *  not su and would take last slot.
	 */
	if (p2==NULL)
		tablefull("proc");
#ifdef QUOTA
	if (p2==NULL || (u.u_uid!=0 && p2==procNPROC-1)) {
#else
	if (p2==NULL || (u.u_uid!=0 && (p2==procNPROC-1 || a>MAXUPRC))) {
#endif
		u.u_error = EAGAIN;
		if (!isvfork) {
			(void) vsexpand(0, &u.u_cdmap, 1);
			(void) vsexpand(0, &u.u_csmap, 1);
		}
		goto out;
	}
	p1 = u.u_procp;
	if (newproc(isvfork)) {
		u.u_r.r_val1 = p1->p_pid;
		u.u_r.r_val2 = 1;  /* child */
		u.u_start = time;
		u.u_acflag = AFORK;
#ifdef QUOTA
		u.u_qflags &= ~QUF_LOGIN;
#endif
		return;
	}
	u.u_r.r_val1 = p2->p_pid;

out:
	u.u_r.r_val2 = 0;
}

spgrp(top, npgrp)
register struct proc *top;
{
	register struct proc *pp, *p;
	int f = 0;

	for (p = top; npgrp == -1 || u.u_uid == p->p_uid ||
	    !u.u_uid || inferior(p); p = pp) {
		if (npgrp == -1) {
#define	bit(a)	(1<<(a-1))
			p->p_sig &= ~(bit(SIGTSTP)|bit(SIGTTIN)|bit(SIGTTOU));
		} else
			p->p_pgrp = npgrp;
		f++;
		/*
		 * Search for children.
		 */
		for (pp = proc; pp < procNPROC; pp++)
			if (pp->p_pptr == p)
				goto cont;
		/*
		 * Search for siblings.
		 */
		for (; p != top; p = p->p_pptr)
			for (pp = p + 1; pp < procNPROC; pp++)
				if (pp->p_pptr == p->p_pptr)
					goto cont;
		break;
	cont:
		;
	}
	return (f);
}

/*
 * Is p an inferior of the current process?
 */
inferior(p)
register struct proc *p;
{

	for (; p != u.u_procp; p = p->p_pptr)
		if (p->p_ppid == 0)
			return (0);
	return (1);
}
Commit	Line	Data
6fd40cea	1	/* kern_proc.c 4.31 82/08/11 */
29dd101b BJ	2
	3	#include "../h/param.h"
	4	#include "../h/systm.h"
	5	#include "../h/map.h"
	6	#include "../h/mtpr.h"
	7	#include "../h/dir.h"
	8	#include "../h/user.h"
	9	#include "../h/proc.h"
	10	#include "../h/buf.h"
	11	#include "../h/reg.h"
	12	#include "../h/inode.h"
	13	#include "../h/seg.h"
	14	#include "../h/acct.h"
8643403f	15	#include "/usr/include/wait.h"
29dd101b BJ	16	#include "../h/pte.h"
	17	#include "../h/vm.h"
	18	#include "../h/text.h"
bdfe5b0f	19	#include "../h/psl.h"
b07c4d64	20	#include "../h/vlimit.h"
3ca1542b	21	#include "../h/file.h"
feab6b5e	22	#include "../h/quota.h"
4147b3f6	23	#include "../h/descrip.h"
6fd40cea	24	#include "../h/uio.h"
29dd101b BJ	25
	26	/*
	27	* exec system call, with and without environments.
	28	*/
	29	struct execa {
	30	char *fname;
	31	char **argp;
	32	char **envp;
	33	};
	34
	35	exec()
	36	{
	37	((struct execa *)u.u_ap)->envp = NULL;
	38	exece();
	39	}
	40
	41	exece()
	42	{
	43	register nc;
	44	register char *cp;
	45	register struct buf *bp;
	46	register struct execa *uap;
	47	int na, ne, ucp, ap, c;
7eeaac77 RE	48	int indir, uid, gid;
7eeaac77 RE	49	char *sharg;
29dd101b BJ	50	struct inode *ip;
29dd101b BJ	51	swblk_t bno;
6459ebe0	52	char cfname[MAXNAMLEN + 1];
7eeaac77	53	char cfarg[SHSIZE];
6fd40cea BJ	54	struct uio uio;
6fd40cea BJ	55	struct iovec iovec;
29dd101b	56
5485e062	57	if ((ip = namei(uchar, 0, 1)) == NULL)
29dd101b BJ	58	return;
	59	bno = 0;
	60	bp = 0;
7eeaac77 RE	61	indir = 0;
	62	uid = u.u_uid;
	63	gid = u.u_gid;
7eeaac77 RE	64	if (ip->i_mode & ISUID)
	65	uid = ip->i_uid;
	66	if (ip->i_mode & ISGID)
	67	gid = ip->i_gid;
	68
	69	again:
e92a04af	70	if (access(ip, IEXEC))
29dd101b	71	goto bad;
e92a04af	72	if ((u.u_procp->p_flag&STRC) && access(ip, IREAD))
eb83bf86	73	goto bad;
e92a04af	74	if ((ip->i_mode & IFMT) != IFREG \|\|
29dd101b BJ	75	(ip->i_mode & (IEXEC\|(IEXEC>>3)\|(IEXEC>>6))) == 0) {
	76	u.u_error = EACCES;
	77	goto bad;
	78	}
7eeaac77 RE	79
	80	/*
	81	* Read in first few bytes of file for segment sizes, ux_mag:
	82	* 407 = plain executable
	83	* 410 = RO text
	84	* 413 = demand paged RO text
	85	* Also an ASCII line beginning with #! is
	86	* the file name of a ``shell'' and arguments may be prepended
	87	* to the argument list if given here.
	88	*
	89	* SHELL NAMES ARE LIMITED IN LENGTH.
	90	*
	91	* ONLY ONE ARGUMENT MAY BE PASSED TO THE SHELL FROM
	92	* THE ASCII LINE.
	93	*/
6fd40cea BJ	94	uio.uio_iov = &iovec;
	95	uio.uio_iovcnt = 1;
	96	iovec.iov_base = (caddr_t)&u.u_exdata;
	97	iovec.iov_len = sizeof (u.u_exdata);
	98	uio.uio_offset = 0;
	99	uio.uio_segflg = 1;
	100	u.u_error = readip(ip, &uio);
e92a04af	101	if (u.u_error)
7eeaac77	102	goto bad;
6fd40cea	103	u.u_count = uio.uio_resid;
348d7c13 BJ	104	if (u.u_count > sizeof(u.u_exdata) - sizeof(u.u_exdata.Ux_A) &&
348d7c13 BJ	105	u.u_exdata.ux_shell[0] != '#') {
7eeaac77 RE	106	u.u_error = ENOEXEC;
	107	goto bad;
	108	}
	109	switch (u.u_exdata.ux_mag) {
	110
	111	case 0407:
	112	u.u_exdata.ux_dsize += u.u_exdata.ux_tsize;
	113	u.u_exdata.ux_tsize = 0;
	114	break;
	115
	116	case 0413:
	117	case 0410:
	118	if (u.u_exdata.ux_tsize == 0) {
	119	u.u_error = ENOEXEC;
	120	goto bad;
	121	}
	122	break;
	123
	124	default:
	125	if (u.u_exdata.ux_shell[0] != '#' \|\|
	126	u.u_exdata.ux_shell[1] != '!' \|\|
	127	indir) {
	128	u.u_error = ENOEXEC;
	129	goto bad;
	130	}
	131	cp = &u.u_exdata.ux_shell[2]; /* skip "#!" */
	132	while (cp < &u.u_exdata.ux_shell[SHSIZE]) {
	133	if (*cp == '\t')
	134	*cp = ' ';
	135	else if (*cp == '\n') {
	136	*cp = '\0';
	137	break;
	138	}
	139	cp++;
	140	}
	141	if (*cp != '\0') {
	142	u.u_error = ENOEXEC;
	143	goto bad;
	144	}
	145	cp = &u.u_exdata.ux_shell[2];
	146	while (*cp == ' ')
	147	cp++;
	148	u.u_dirp = cp;
	149	while (cp && cp != ' ')
	150	cp++;
	151	sharg = NULL;
	152	if (*cp) {
	153	*cp++ = '\0';
	154	while (*cp == ' ')
	155	cp++;
	156	if (*cp) {
	157	bcopy((caddr_t)cp, (caddr_t)cfarg, SHSIZE);
	158	sharg = cfarg;
	159	}
	160	}
6459ebe0 KM	161	bcopy((caddr_t)u.u_dent.d_name, (caddr_t)cfname,
6459ebe0 KM	162	u.u_dent.d_namlen + 1);
7eeaac77 RE	163	indir = 1;
7eeaac77 RE	164	iput(ip);
5485e062	165	ip = namei(schar, 0, 1);
7eeaac77 RE	166	if (ip == NULL)
	167	return;
	168	goto again;
	169	}
	170
29dd101b BJ	171	/*
	172	* Collect arguments on "file" in swap space.
	173	*/
	174	na = 0;
	175	ne = 0;
	176	nc = 0;
	177	uap = (struct execa *)u.u_ap;
b725a0ca	178	if ((bno = rmalloc(argmap, ctod(clrnd((int) btoc(NCARGS))))) == 0) {
29dd101b BJ	179	swkill(u.u_procp, "exece");
	180	goto bad;
	181	}
	182	if (bno % CLSIZE)
b725a0ca	183	panic("execa rmalloc");
29dd101b BJ	184	if (uap->argp) for (;;) {
29dd101b BJ	185	ap = NULL;
40d07ebb	186	if (indir && (na == 1 \|\| na == 2 && sharg))
7eeaac77 RE	187	ap = (int)uap->fname;
7eeaac77 RE	188	else if (uap->argp) {
29dd101b BJ	189	ap = fuword((caddr_t)uap->argp);
	190	uap->argp++;
	191	}
	192	if (ap==NULL && uap->envp) {
	193	uap->argp = NULL;
	194	if ((ap = fuword((caddr_t)uap->envp)) == NULL)
	195	break;
	196	uap->envp++;
	197	ne++;
	198	}
6459ebe0	199	if (ap == NULL)
29dd101b BJ	200	break;
29dd101b BJ	201	na++;
e92a04af	202	if (ap == -1)
29dd101b BJ	203	u.u_error = EFAULT;
	204	do {
	205	if (nc >= NCARGS-1)
	206	u.u_error = E2BIG;
7eeaac77 RE	207	if (indir && na == 2 && sharg != NULL)
	208	c = *sharg++ & 0377;
	209	else if ((c = fubyte((caddr_t)ap++)) < 0)
29dd101b	210	u.u_error = EFAULT;
64d6118b BJ	211	if (u.u_error) {
	212	if (bp)
	213	brelse(bp);
	214	bp = 0;
29dd101b	215	goto badarg;
64d6118b	216	}
6459ebe0	217	if (nc % (CLSIZE*NBPG) == 0) {
29dd101b BJ	218	if (bp)
29dd101b BJ	219	bdwrite(bp);
6459ebe0 KM	220	bp = getblk(argdev, bno + nc / NBPG,
6459ebe0 KM	221	CLSIZE*NBPG);
29dd101b BJ	222	cp = bp->b_un.b_addr;
	223	}
	224	nc++;
	225	*cp++ = c;
6459ebe0	226	} while (c > 0);
29dd101b BJ	227	}
	228	if (bp)
	229	bdwrite(bp);
	230	bp = 0;
	231	nc = (nc + NBPW-1) & ~(NBPW-1);
6459ebe0 KM	232	if (indir) {
	233	u.u_dent.d_namlen = strlen(cfname);
	234	bcopy((caddr_t)cfname, (caddr_t)u.u_dent.d_name,
	235	u.u_dent.d_namlen + 1);
	236	}
7eeaac77	237	getxfile(ip, nc + (na+4)*NBPW, uid, gid);
29a06346	238	if (u.u_error) {
29dd101b	239	badarg:
6459ebe0 KM	240	for (c = 0; c < nc; c += CLSIZE*NBPG)
6459ebe0 KM	241	if (bp = baddr(argdev, bno + c / NBPG, CLSIZE*NBPG)) {
29dd101b BJ	242	bp->b_flags \|= B_AGE; /* throw away */
	243	bp->b_flags &= ~B_DELWRI; /* cancel io */
	244	brelse(bp);
	245	bp = 0;
	246	}
	247	goto bad;
	248	}
	249
	250	/*
	251	* copy back arglist
	252	*/
29dd101b BJ	253	ucp = USRSTACK - nc - NBPW;
	254	ap = ucp - naNBPW - 3NBPW;
	255	u.u_ar0[SP] = ap;
81263dba	256	(void) suword((caddr_t)ap, na-ne);
29dd101b BJ	257	nc = 0;
	258	for (;;) {
	259	ap += NBPW;
	260	if (na==ne) {
81263dba	261	(void) suword((caddr_t)ap, 0);
29dd101b BJ	262	ap += NBPW;
	263	}
	264	if (--na < 0)
	265	break;
81263dba	266	(void) suword((caddr_t)ap, ucp);
29dd101b	267	do {
6459ebe0	268	if (nc % (CLSIZE*NBPG) == 0) {
29dd101b BJ	269	if (bp)
29dd101b BJ	270	brelse(bp);
6459ebe0 KM	271	bp = bread(argdev, bno + nc / NBPG,
6459ebe0 KM	272	CLSIZE*NBPG);
29dd101b BJ	273	bp->b_flags \|= B_AGE; /* throw away */
	274	bp->b_flags &= ~B_DELWRI; /* cancel io */
	275	cp = bp->b_un.b_addr;
	276	}
81263dba	277	(void) subyte((caddr_t)ucp++, (c = *cp++));
29dd101b BJ	278	nc++;
	279	} while(c&0377);
	280	}
81263dba BJ	281	(void) suword((caddr_t)ap, 0);
81263dba BJ	282	(void) suword((caddr_t)ucp, 0);
29dd101b BJ	283	setregs();
	284	bad:
	285	if (bp)
	286	brelse(bp);
	287	if (bno)
b725a0ca	288	rmfree(argmap, ctod(clrnd((int) btoc(NCARGS))), bno);
29dd101b BJ	289	iput(ip);
	290	}
	291
	292	/*
	293	* Read in and set up memory for executed file.
29dd101b	294	*/
7eeaac77	295	getxfile(ip, nargc, uid, gid)
29dd101b BJ	296	register struct inode *ip;
29dd101b BJ	297	{
29dd101b	298	register size_t ts, ds, ss;
7eeaac77	299	int pagi;
29dd101b	300
7eeaac77	301	if (u.u_exdata.ux_mag == 0413)
29dd101b	302	pagi = SPAGI;
7eeaac77 RE	303	else
7eeaac77 RE	304	pagi = 0;
e92a04af BJ	305	if (u.u_exdata.ux_tsize!=0 && (ip->i_flag&ITEXT)==0 &&
e92a04af BJ	306	ip->i_count!=1) {
3ca1542b BJ	307	register struct file *fp;
3ca1542b BJ	308
e92a04af	309	for (fp = file; fp < fileNFILE; fp++) {
4147b3f6 BJ	310	if (fp->f_type == DTYPE_FILE &&
4147b3f6 BJ	311	fp->f_inode == ip && (fp->f_flag&FWRITE)) {
3ca1542b BJ	312	u.u_error = ETXTBSY;
	313	goto bad;
	314	}
e92a04af	315	}
29dd101b BJ	316	}
	317
	318	/*
e92a04af	319	* Compute text and data sizes and make sure not too large.
29dd101b	320	*/
29dd101b BJ	321	ts = clrnd(btoc(u.u_exdata.ux_tsize));
	322	ds = clrnd(btoc((u.u_exdata.ux_dsize+u.u_exdata.ux_bsize)));
	323	ss = clrnd(SSIZE + btoc(nargc));
29a06346 BJ	324	if (chksize(ts, ds, ss))
29a06346 BJ	325	goto bad;
e92a04af BJ	326
	327	/*
	328	* Make sure enough space to start process.
	329	*/
29a06346 BJ	330	u.u_cdmap = zdmap;
	331	u.u_csmap = zdmap;
	332	if (swpexpand(ds, ss, &u.u_cdmap, &u.u_csmap) == NULL)
	333	goto bad;
29dd101b	334
29a06346 BJ	335	/*
	336	* At this point, committed to the new image!
	337	* Release virtual memory resources of old process, and
	338	* initialize the virtual memory of the new process.
	339	* If we resulted from vfork(), instead wakeup our
	340	* parent who will set SVFDONE when he has taken back
	341	* our resources.
	342	*/
	343	u.u_prof.pr_scale = 0;
	344	if ((u.u_procp->p_flag & SVFORK) == 0)
	345	vrelvm();
	346	else {
	347	u.u_procp->p_flag &= ~SVFORK;
	348	u.u_procp->p_flag \|= SKEEP;
	349	wakeup((caddr_t)u.u_procp);
	350	while ((u.u_procp->p_flag & SVFDONE) == 0)
	351	sleep((caddr_t)u.u_procp, PZERO - 1);
	352	u.u_procp->p_flag &= ~(SVFDONE\|SKEEP);
	353	}
2ce421b6	354	u.u_procp->p_flag &= ~(SPAGI\|SSEQL\|SUANOM\|SNUSIG);
29a06346 BJ	355	u.u_procp->p_flag \|= pagi;
	356	u.u_dmap = u.u_cdmap;
	357	u.u_smap = u.u_csmap;
	358	vgetvm(ts, ds, ss);
29dd101b	359
29a06346	360	if (pagi == 0) {
29dd101b	361	/*
29a06346	362	* Read in data segment.
29dd101b	363	*/
29a06346 BJ	364	u.u_base = (char *)ctob(ts);
	365	u.u_offset = sizeof(u.u_exdata)+u.u_exdata.ux_tsize;
	366	u.u_count = u.u_exdata.ux_dsize;
	367	readi(ip);
29dd101b	368	}
29a06346 BJ	369	xalloc(ip, pagi);
	370	if (pagi && u.u_procp->p_textp)
	371	vinifod((struct fpte *)dptopte(u.u_procp, 0),
	372	PG_FTEXT, u.u_procp->p_textp->x_iptr,
	373	1 + ts/CLSIZE, (int)btoc(u.u_exdata.ux_dsize));
	374
	375	/* THIS SHOULD BE DONE AT A LOWER LEVEL, IF AT ALL */
	376	mtpr(TBIA, 0);
	377
5b98abb9 BJ	378	if (u.u_error)
5b98abb9 BJ	379	swkill(u.u_procp, "i/o error mapping pages");
29a06346 BJ	380	/*
	381	* set SUID/SGID protections, if no tracing
	382	*/
	383	if ((u.u_procp->p_flag&STRC)==0) {
e92a04af BJ	384	u.u_uid = uid;
e92a04af BJ	385	u.u_procp->p_uid = uid;
7eeaac77	386	u.u_gid = gid;
4f4caf05	387	u.u_grps[gid/(sizeof(int)8)] \|= 1 << (gid%(sizeof(int)8));
29a06346 BJ	388	} else
29a06346 BJ	389	psignal(u.u_procp, SIGTRAP);
29dd101b BJ	390	u.u_tsize = ts;
	391	u.u_dsize = ds;
	392	u.u_ssize = ss;
29dd101b	393	bad:
29a06346	394	return;
29dd101b BJ	395	}
	396
	397	/*
	398	* Clear registers on exec
	399	*/
	400	setregs()
	401	{
594ebedd	402	register int (**rp)();
29dd101b	403	register i;
bdfe5b0f	404	long sigmask;
29dd101b	405
4e6e3887	406	for (rp = &u.u_signal[1], sigmask = 1L; rp < &u.u_signal[NSIG];
bdfe5b0f BJ	407	sigmask <<= 1, rp++) {
	408	switch (*rp) {
	409
	410	case SIG_IGN:
	411	case SIG_DFL:
	412	case SIG_HOLD:
	413	continue;
	414
	415	default:
	416	/*
99fa88a2	417	* Normal or deferring catch; revert to default.
bdfe5b0f	418	*/
99fa88a2 BJ	419	(void) spl6();
99fa88a2 BJ	420	*rp = SIG_DFL;
bdfe5b0f BJ	421	if ((int)*rp & 1)
	422	u.u_procp->p_siga0 \|= sigmask;
	423	else
a4aaef65	424	u.u_procp->p_siga0 &= ~sigmask;
bdfe5b0f BJ	425	if ((int)*rp & 2)
	426	u.u_procp->p_siga1 \|= sigmask;
	427	else
	428	u.u_procp->p_siga1 &= ~sigmask;
99fa88a2	429	(void) spl0();
bdfe5b0f BJ	430	continue;
	431	}
	432	}
29dd101b	433	/*
e92a04af	434	for (rp = &u.u_ar0[0]; rp < &u.u_ar0[16];)
29dd101b BJ	435	*rp++ = 0;
	436	*/
	437	u.u_ar0[PC] = u.u_exdata.ux_entloc + 2; /* skip over entry mask */
e92a04af	438	for (i=0; i<NOFILE; i++) {
29dd101b	439	if (u.u_pofile[i]&EXCLOSE) {
a81e9a81	440	closef(u.u_ofile[i], 1, u.u_pofile[i]);
29dd101b	441	u.u_ofile[i] = NULL;
a81e9a81	442	u.u_pofile[i] = 0;
29dd101b	443	}
29dd101b	444	}
e92a04af	445
29dd101b BJ	446	/*
	447	* Remember file name for accounting.
	448	*/
	449	u.u_acflag &= ~AFORK;
6459ebe0 KM	450	bcopy((caddr_t)u.u_dent.d_name, (caddr_t)u.u_comm,
6459ebe0 KM	451	u.u_dent.d_namlen + 1);
29dd101b BJ	452	}
	453
	454	/*
e92a04af	455	* Exit system call: pass back caller's arg
29dd101b BJ	456	*/
	457	rexit()
	458	{
	459	register struct a {
	460	int rval;
	461	} *uap;
	462
	463	uap = (struct a *)u.u_ap;
	464	exit((uap->rval & 0377) << 8);
	465	}
	466
	467	/*
	468	* Release resources.
	469	* Save u. area for parent to look at.
	470	* Enter zombie state.
	471	* Wake up parent and init processes,
	472	* and dispose of children.
	473	*/
	474	exit(rv)
	475	{
	476	register int i;
	477	register struct proc p, q;
29dd101b BJ	478	register int x;
	479
	480	#ifdef PGINPROF
	481	vmsizmon();
	482	#endif
	483	p = u.u_procp;
	484	p->p_flag &= ~(STRC\|SULOCK);
	485	p->p_flag \|= SWEXIT;
	486	p->p_clktim = 0;
bdfe5b0f BJ	487	(void) spl6();
	488	if ((int)SIG_IGN & 1)
	489	p->p_siga0 = ~0;
	490	else
	491	p->p_siga0 = 0;
	492	if ((int)SIG_IGN & 2)
	493	p->p_siga1 = ~0;
	494	else
99fa88a2	495	p->p_siga1 = 0;
bdfe5b0f	496	(void) spl0();
dd808ba3 BJ	497	p->p_cpticks = 0;
dd808ba3 BJ	498	p->p_pctcpu = 0;
e92a04af	499	for (i=0; i<NSIG; i++)
594ebedd	500	u.u_signal[i] = SIG_IGN;
29dd101b BJ	501	/*
	502	* Release virtual memory. If we resulted from
	503	* a vfork(), instead give the resources back to
	504	* the parent.
	505	*/
	506	if ((p->p_flag & SVFORK) == 0)
	507	vrelvm();
	508	else {
	509	p->p_flag &= ~SVFORK;
	510	wakeup((caddr_t)p);
	511	while ((p->p_flag & SVFDONE) == 0)
	512	sleep((caddr_t)p, PZERO - 1);
	513	p->p_flag &= ~SVFDONE;
	514	}
a81e9a81 SL	515	for (i = 0; i < NOFILE; i++) {
	516	#ifdef notdef
	517	/* why was this like this? */
29dd101b BJ	518	f = u.u_ofile[i];
29dd101b BJ	519	u.u_ofile[i] = NULL;
f3156a73	520	closef(f, 1);
a81e9a81 SL	521	#else
	522	closef(u.u_ofile[i], 1, u.u_pofile[i]);
	523	u.u_ofile[i] = NULL;
	524	u.u_pofile[i] = 0;
	525	#endif
29dd101b	526	}
e92a04af	527	ilock(u.u_cdir);
29dd101b BJ	528	iput(u.u_cdir);
29dd101b BJ	529	if (u.u_rdir) {
e92a04af	530	ilock(u.u_rdir);
29dd101b BJ	531	iput(u.u_rdir);
29dd101b BJ	532	}
054016e1	533	u.u_limit[LIM_FSIZE] = INFINITY;
29dd101b	534	acct();
feab6b5e RE	535	#ifdef QUOTA
	536	qclean();
	537	#endif
29dd101b BJ	538	vrelpt(u.u_procp);
29dd101b BJ	539	vrelu(u.u_procp, 0);
f12a8410	540	(void) spl5(); /* hack for mem alloc race XXX */
29dd101b	541	multprog--;
29dd101b	542	p->p_stat = SZOMB;
42343c0f	543	noproc = 1;
29dd101b BJ	544	i = PIDHASH(p->p_pid);
	545	x = p - proc;
	546	if (pidhash[i] == x)
	547	pidhash[i] = p->p_idhash;
	548	else {
	549	for (i = pidhash[i]; i != 0; i = proc[i].p_idhash)
	550	if (proc[i].p_idhash == x) {
	551	proc[i].p_idhash = p->p_idhash;
	552	goto done;
	553	}
	554	panic("exit");
	555	}
9c82b9fd BJ	556	if (p->p_pid == 1)
9c82b9fd BJ	557	panic("init died");
29dd101b BJ	558	done:
	559	((struct xproc )p)->xp_xstat = rv; / overlay */
	560	((struct xproc )p)->xp_vm = u.u_vm; / overlay */
	561	vmsadd(&((struct xproc *)p)->xp_vm, &u.u_cvm);
e92a04af BJ	562	for (q = proc; q < procNPROC; q++)
e92a04af BJ	563	if (q->p_pptr == p) {
feab6b5e RE	564	if (q->p_osptr)
	565	q->p_osptr->p_ysptr = q->p_ysptr;
	566	if (q->p_ysptr)
	567	q->p_ysptr->p_osptr = q->p_osptr;
	568	if (proc[1].p_cptr)
	569	proc[1].p_cptr->p_ysptr = q;
	570	q->p_osptr = proc[1].p_cptr;
	571	q->p_ysptr = NULL;
	572	proc[1].p_cptr = q;
	573
bdfe5b0f	574	q->p_pptr = &proc[1];
29dd101b	575	q->p_ppid = 1;
bdfe5b0f BJ	576	wakeup((caddr_t)&proc[1]);
bdfe5b0f BJ	577	/*
0dde1c43	578	* Traced processes are killed
bdfe5b0f	579	* since their existence means someone is screwing up.
62bac59f	580	* Stopped processes are sent a hangup and a continue.
0dde1c43 BJ	581	* This is designed to be ``safe'' for setuid
	582	* processes since they must be willing to tolerate
	583	* hangups anyways.
bdfe5b0f	584	*/
0dde1c43	585	if (q->p_flag&STRC) {
bdfe5b0f BJ	586	q->p_flag &= ~STRC;
bdfe5b0f BJ	587	psignal(q, SIGKILL);
0dde1c43 BJ	588	} else if (q->p_stat == SSTOP) {
	589	psignal(q, SIGHUP);
	590	psignal(q, SIGCONT);
bdfe5b0f	591	}
8643403f BJ	592	/*
8643403f BJ	593	* Protect this process from future
7ac93404	594	* tty signals, clear TSTP/TTIN/TTOU if pending.
8643403f	595	*/
934e4ecf	596	(void) spgrp(q, -1);
29dd101b	597	}
bdfe5b0f	598	psignal(p->p_pptr, SIGCHLD);
4e6e3887	599	wakeup((caddr_t)p->p_pptr);
29dd101b BJ	600	swtch();
	601	}
	602
	603	wait()
	604	{
bdfe5b0f BJ	605	struct vtimes vm;
bdfe5b0f BJ	606	struct vtimes *vp;
29dd101b	607
bdfe5b0f BJ	608	if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) {
	609	wait1(0, (struct vtimes *)0);
	610	return;
	611	}
	612	vp = (struct vtimes *)u.u_ar0[R1];
	613	wait1(u.u_ar0[R0], &vm);
	614	if (u.u_error)
	615	return;
	616	(void) copyout((caddr_t)&vm, (caddr_t)vp, sizeof (struct vtimes));
29dd101b BJ	617	}
	618
	619	/*
	620	* Wait system call.
	621	* Search for a terminated (zombie) child,
	622	* finally lay it to rest, and collect its status.
	623	* Look also for stopped (traced) children,
	624	* and pass back status from them.
	625	*/
bdfe5b0f BJ	626	wait1(options, vp)
bdfe5b0f BJ	627	register options;
29dd101b BJ	628	struct vtimes *vp;
	629	{
	630	register f;
feab6b5e	631	register struct proc p, q;
29dd101b BJ	632
29dd101b BJ	633	f = 0;
29dd101b	634	loop:
e92a04af BJ	635	for (p = proc; p < procNPROC; p++)
e92a04af BJ	636	if (p->p_pptr == u.u_procp) {
29dd101b	637	f++;
e92a04af	638	if (p->p_stat == SZOMB) {
29dd101b BJ	639	u.u_r.r_val1 = p->p_pid;
	640	u.u_r.r_val2 = ((struct xproc *)p)->xp_xstat;
	641	((struct xproc *)p)->xp_xstat = 0;
	642	if (vp)
	643	vp = ((struct xproc )p)->xp_vm;
	644	vmsadd(&u.u_cvm, &((struct xproc *)p)->xp_vm);
	645	((struct xproc *)p)->xp_vm = zvms;
	646	p->p_stat = NULL;
	647	p->p_pid = 0;
	648	p->p_ppid = 0;
feab6b5e RE	649	if (q = p->p_ysptr)
	650	q->p_osptr = p->p_osptr;
	651	if (q = p->p_osptr)
	652	q->p_ysptr = p->p_ysptr;
	653	if ((q = p->p_pptr)->p_cptr == p)
	654	q->p_cptr = p->p_osptr;
bdfe5b0f	655	p->p_pptr = 0;
feab6b5e RE	656	p->p_ysptr = 0;
	657	p->p_osptr = 0;
	658	p->p_cptr = 0;
29dd101b	659	p->p_sig = 0;
bdfe5b0f BJ	660	p->p_siga0 = 0;
bdfe5b0f BJ	661	p->p_siga1 = 0;
29dd101b BJ	662	p->p_pgrp = 0;
	663	p->p_flag = 0;
	664	p->p_wchan = 0;
bdfe5b0f	665	p->p_cursig = 0;
29dd101b BJ	666	return;
29dd101b BJ	667	}
bdfe5b0f BJ	668	if (p->p_stat == SSTOP && (p->p_flag&SWTED)==0 &&
	669	(p->p_flag&STRC \|\| options&WUNTRACED)) {
	670	p->p_flag \|= SWTED;
	671	u.u_r.r_val1 = p->p_pid;
	672	u.u_r.r_val2 = (p->p_cursig<<8) \| WSTOPPED;
	673	return;
29dd101b BJ	674	}
29dd101b BJ	675	}
bdfe5b0f BJ	676	if (f==0) {
	677	u.u_error = ECHILD;
	678	return;
	679	}
	680	if (options&WNOHANG) {
	681	u.u_r.r_val1 = 0;
	682	return;
	683	}
29a06346	684	if ((u.u_procp->p_flag&SNUSIG) && setjmp(u.u_qsav)) {
bdfe5b0f BJ	685	u.u_eosys = RESTARTSYS;
bdfe5b0f BJ	686	return;
29dd101b	687	}
bdfe5b0f BJ	688	sleep((caddr_t)u.u_procp, PWAIT);
bdfe5b0f BJ	689	goto loop;
29dd101b BJ	690	}
	691
	692	/*
	693	* fork system call.
	694	*/
	695	fork()
	696	{
	697
	698	u.u_cdmap = zdmap;
	699	u.u_csmap = zdmap;
	700	if (swpexpand(u.u_dsize, u.u_ssize, &u.u_cdmap, &u.u_csmap) == 0) {
	701	u.u_r.r_val2 = 0;
	702	return;
	703	}
	704	fork1(0);
	705	}
	706
	707	fork1(isvfork)
	708	{
	709	register struct proc p1, p2;
feab6b5e	710	#ifndef QUOTA
29dd101b BJ	711	register a;
	712
	713	a = 0;
feab6b5e RE	714	#else
	715	if (u.u_quota != NOQUOT && u.u_quota->q_plim &&
	716	u.u_quota->q_cnt >= u.u_quota->q_plim) {
	717	u.u_error = EPROCLIM;
	718	return;
	719	}
	720	#endif
29dd101b	721	p2 = NULL;
e92a04af	722	for (p1 = proc; p1 < procNPROC; p1++) {
feab6b5e RE	723	#ifdef QUOTA
	724	if (p1->p_stat == NULL) {
	725	p2 = p1;
	726	break;
	727	}
	728	#else
29dd101b BJ	729	if (p1->p_stat==NULL && p2==NULL)
	730	p2 = p1;
	731	else {
	732	if (p1->p_uid==u.u_uid && p1->p_stat!=NULL)
	733	a++;
	734	}
feab6b5e	735	#endif
29dd101b BJ	736	}
	737	/*
	738	* Disallow if
	739	* No processes at all;
	740	* not su and too many procs owned; or
	741	* not su and would take last slot.
	742	*/
62901f34 BJ	743	if (p2==NULL)
62901f34 BJ	744	tablefull("proc");
feab6b5e RE	745	#ifdef QUOTA
	746	if (p2==NULL \|\| (u.u_uid!=0 && p2==procNPROC-1)) {
	747	#else
86fd527f	748	if (p2==NULL \|\| (u.u_uid!=0 && (p2==procNPROC-1 \|\| a>MAXUPRC))) {
feab6b5e	749	#endif
29dd101b BJ	750	u.u_error = EAGAIN;
29dd101b BJ	751	if (!isvfork) {
81263dba BJ	752	(void) vsexpand(0, &u.u_cdmap, 1);
81263dba BJ	753	(void) vsexpand(0, &u.u_csmap, 1);
29dd101b BJ	754	}
	755	goto out;
	756	}
	757	p1 = u.u_procp;
e92a04af	758	if (newproc(isvfork)) {
29dd101b BJ	759	u.u_r.r_val1 = p1->p_pid;
	760	u.u_r.r_val2 = 1; /* child */
	761	u.u_start = time;
	762	u.u_acflag = AFORK;
feab6b5e RE	763	#ifdef QUOTA
	764	u.u_qflags &= ~QUF_LOGIN;
	765	#endif
29dd101b BJ	766	return;
	767	}
	768	u.u_r.r_val1 = p2->p_pid;
	769
	770	out:
	771	u.u_r.r_val2 = 0;
	772	}
	773
4147b3f6 BJ	774	spgrp(top, npgrp)
	775	register struct proc *top;
	776	{
	777	register struct proc pp, p;
	778	int f = 0;
	779
	780	for (p = top; npgrp == -1 \|\| u.u_uid == p->p_uid \|\|
	781	!u.u_uid \|\| inferior(p); p = pp) {
	782	if (npgrp == -1) {
	783	#define bit(a) (1<<(a-1))
	784	p->p_sig &= ~(bit(SIGTSTP)\|bit(SIGTTIN)\|bit(SIGTTOU));
	785	} else
	786	p->p_pgrp = npgrp;
	787	f++;
	788	/*
	789	* Search for children.
	790	*/
	791	for (pp = proc; pp < procNPROC; pp++)
	792	if (pp->p_pptr == p)
	793	goto cont;
	794	/*
	795	* Search for siblings.
	796	*/
	797	for (; p != top; p = p->p_pptr)
	798	for (pp = p + 1; pp < procNPROC; pp++)
	799	if (pp->p_pptr == p->p_pptr)
	800	goto cont;
	801	break;
	802	cont:
	803	;
	804	}
	805	return (f);
	806	}
	807
29dd101b	808	/*
4147b3f6	809	* Is p an inferior of the current process?
29dd101b	810	*/
4147b3f6 BJ	811	inferior(p)
4147b3f6 BJ	812	register struct proc *p;
29dd101b	813	{
29dd101b	814
4147b3f6 BJ	815	for (; p != u.u_procp; p = p->p_pptr)
	816	if (p->p_ppid == 0)
	817	return (0);
	818	return (1);
29dd101b	819	}