-gethostid()
-{
-
- u.u_r.r_val1 = hostid;
-}
-
-sethostid()
-{
- struct a {
- int hostid;
- } *uap = (struct a *)u.u_ap;
-
- if (suser())
- hostid = uap->hostid;
-}
-
-gethostname()
-{
- register struct a {
- char *hostname;
- int len;
- } *uap = (struct a *)u.u_ap;
- register u_int len;
-
- len = uap->len;
- if (len > hostnamelen + 1)
- len = hostnamelen + 1;
- u.u_error = copyout((caddr_t)hostname, (caddr_t)uap->hostname, len);
-}
-
-sethostname()
-{
- register struct a {
- char *hostname;
- u_int len;
- } *uap = (struct a *)u.u_ap;
-
- if (!suser())
- return;
- if (uap->len > sizeof (hostname) - 1) {
- u.u_error = EINVAL;
- return;
- }
- hostnamelen = uap->len;
- u.u_error = copyin((caddr_t)uap->hostname, hostname, uap->len);
- hostname[hostnamelen] = 0;
-}
-
-/*
- * exec system call, with and without environments.
- */
-struct execa {
- char *fname;
- char **argp;
- char **envp;
-};
-
-execv()
-{
- ((struct execa *)u.u_ap)->envp = NULL;
- execve();
-}
-
-execve()
-{
- 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[MAXCOMLEN + 1];
- char cfarg[SHSIZE];
- int resid;
-
- if ((ip = namei(uchar, LOOKUP, 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.
- */
- u.u_exdata.ux_shell[0] = 0; /* for zero length files */
- u.u_error = rdwri(UIO_READ, ip, (caddr_t)&u.u_exdata, sizeof (u.u_exdata),
- 0, 1, &resid);
- if (u.u_error)
- goto bad;
- u.u_count = resid;
-#ifndef lint
- 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;
- }
-#endif
- 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;
- }
- }
- if (u.u_dent.d_namlen > MAXCOMLEN)
- u.u_dent.d_namlen = MAXCOMLEN;
- bcopy((caddr_t)u.u_dent.d_name, (caddr_t)cfname,
- (unsigned)(u.u_dent.d_namlen + 1));
- cfname[MAXCOMLEN] = 0;
- indir = 1;
- iput(ip);
- ip = namei(schar, LOOKUP, 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, (long)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 + ctod(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,
- (unsigned)(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) {
- bp = baddr(argdev, bno + ctod(c / NBPG), CLSIZE*NBPG);
- if (bp) {
- 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 + ctod(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);
- setregs();
-bad:
- if (bp)
- brelse(bp);
- if (bno)
- rmfree(argmap, (long)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_count > 0 &&
- 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.
- */
- 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)
- u.u_error =
- rdwri(UIO_READ, ip,
- (char *)ctob(dptov(u.u_procp, 0)),
- (int)u.u_exdata.ux_dsize,
- (int)(sizeof(u.u_exdata)+u.u_exdata.ux_tsize),
- 0, (int *)0);
- 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,
- (long)(1 + ts/CLSIZE), (int)btoc(u.u_exdata.ux_dsize));
-
-#ifdef vax
- /* THIS SHOULD BE DONE AT A LOWER LEVEL, IF AT ALL */
-#include "../vax/mtpr.h" /* XXX */
- mtpr(TBIA, 0);
-#endif
-
- 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;
- } 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;
- }
- }
-#ifdef vax
-/*
- for (rp = &u.u_ar0[0]; rp < &u.u_ar0[16];)
- *rp++ = 0;
-*/
- u.u_ar0[PC] = u.u_exdata.ux_entloc+2;
-#endif
-#ifdef sun
- { register struct regs *r = (struct regs *)u.u_ar0;
- for (i = 0; i < 8; i++) {
- r->r_dreg[i] = 0;
- if (&r->r_areg[i] != &r->r_sp)
- r->r_areg[i] = 0;
- }
- r->r_sr = PSL_USERSET;
- r->r_pc = u.u_exdata.ux_entloc;
- }
-#endif
- for (i=0; i<NOFILE; i++) {
- if (u.u_pofile[i]&UF_EXCLOSE) {
- closef(u.u_ofile[i], 1, u.u_pofile[i]);
- u.u_ofile[i] = NULL;
- u.u_pofile[i] = 0;
- }
- u.u_pofile[i] &= ~UF_MAPPED;
- }
-
- /*
- * Remember file name for accounting.
- */
- u.u_acflag &= ~AFORK;
- bcopy((caddr_t)u.u_dent.d_name, (caddr_t)u.u_comm,
- (unsigned)(u.u_dent.d_namlen + 1));
-#ifdef sun
- u.u_eosys = REALLYRETURN;
-#endif
-}
-
-/*
- * 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;
- struct mbuf *m = m_getclr(M_WAIT, MT_ZOMBIE);
-
-#ifdef PGINPROF
- vmsizmon();
-#endif
- p = u.u_procp;
- p->p_flag &= ~(STRC|SULOCK);
- p->p_flag |= SWEXIT;
- (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;
- untimeout(realitexpire, (caddr_t)p);
- /*
- * 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++) {
- struct file *f;
- int p;
-
- f = u.u_ofile[i];
- u.u_ofile[i] = NULL;
- p = u.u_pofile[i];
- u.u_pofile[i] = 0;
- closef(f, 1, p);
- }
- ilock(u.u_cdir);
- iput(u.u_cdir);
- if (u.u_rdir) {
- ilock(u.u_rdir);
- iput(u.u_rdir);
- }
- u.u_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
- acct();
-#ifdef QUOTA
- qclean();
-#endif
-#ifdef sun
- ctxfree(u.u_procp);
-#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:
- p->p_xstat = rv;
-if (m == 0)
-panic("exit: m_getclr");
- p->p_ru = mtod(m, struct rusage *);
- *p->p_ru = u.u_ru;
- ruadd(p->p_ru, &u.u_cru);
- 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 rusage ru, *rup;
-
- if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) {
- u.u_error = wait1(0, (struct rusage *)0);
- return;
- }
- rup = (struct rusage *)u.u_ar0[R1];
- u.u_error = wait1(u.u_ar0[R0], &ru);
- if (u.u_error)
- return;
- (void) copyout((caddr_t)&ru, (caddr_t)rup, sizeof (struct rusage));
-}
-
-#ifndef NOCOMPAT
-#include "../h/vtimes.h"
-
-owait()
-{
- struct rusage ru;
- struct vtimes *vtp, avt;
-
- if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) {
- u.u_error = wait1(0, (struct rusage *)0);
- return;
- }
- vtp = (struct vtimes *)u.u_ar0[R1];
- u.u_error = wait1(u.u_ar0[R0], &ru);
- if (u.u_error)
- return;
- getvtimes(&ru, &avt);
- (void) copyout((caddr_t)&avt, (caddr_t)vtp, sizeof (struct vtimes));
-}
-#endif
-
-/*
- * 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, ru)
- register int options;
- struct rusage *ru;
-{
- 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 = p->p_xstat;
- p->p_xstat = 0;
- if (ru)
- *ru = *p->p_ru;
- ruadd(&u.u_cru, p->p_ru);
- (void) m_free(dtom(p->p_ru));
- p->p_ru = 0;
- 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 (0);
- }
- 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 (0);
- }
- }
- if (f == 0) {
- return (ECHILD);
- }
- if (options&WNOHANG) {
- u.u_r.r_val1 = 0;
- return (0);
- }
- if ((u.u_procp->p_flag&SNUSIG) && setjmp(&u.u_qsave)) {
- u.u_eosys = RESTARTSYS;
- return (0);
- }
- 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;
- register a;
-
- a = 0;
- p2 = NULL;
- for (p1 = proc; p1 < procNPROC; p1++) {
- if (p1->p_stat==NULL && p2==NULL)
- p2 = p1;
- else {
- if (p1->p_uid==u.u_uid && p1->p_stat!=NULL)
- a++;
- }
- }
- /*
- * 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");
- if (p2==NULL || (u.u_uid!=0 && (p2==procNPROC-1 || a>MAXUPRC))) {
- 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.tv_sec;
- u.u_acflag = AFORK;
- return;
- }
- u.u_r.r_val1 = p2->p_pid;
-
-out:
- u.u_r.r_val2 = 0;
-}
-
projects / unix-history / commitdiff