rt_public void failure(void)
{
/* A fatal Eiffel exception has occurred. The stack of exceptions is dumped
* and the memory is cleaned up, if possible.
*/
GTCX
/* When we arrive at this location, the Eiffel call stack is theoratically
* empty, but `loc_set' still points to the location where the last Eiffel
* call has been made. Since now `loc_set' records address of C local variable
* which are usually located on the C call stack. Any addition to the C call
* stack (like the call to `trapsig' below) will corrupt the information
* stored in `loc_set' since it will replace a location by another.
*
* To prevent this, we have to manually empty `loc_set'. It does not matter
* at this point that the GC forgets about all objects referenced through
* a local variable since all Eiffel calls have been executed.
* Doing so, enables a safe `reclaim' that will not traverse `loc_set'
* objects.
* We then create an empty `loc_set' as most of the run-time macros for stack
* management expect `loc_set' to have at least one chunk.
*/
#ifdef ISE_GC
st_reset (&loc_set);
st_alloc (&loc_set, eif_stack_chunk);
#endif
trapsig(emergency); /* Weird signals are trapped */
esfail(MTC_NOARG); /* Dump the execution stack trace */
reclaim(); /* Reclaim all the objects */
exit(1); /* Abnormal termination */
/* NOTREACHED */
}
/* note: i MUST NOT be 0 */
void
unwind(int i)
{
/*
* This is a kludge. We need to restore everything that was
* changed in the new environment, see cid 1005090337C7A669439
* and 10050903386452ACBF1, but fail to even save things most of
* the time. funcs.c:c_eval() changes FERREXIT temporarily to 0,
* which needs to be restored thus (related to Debian #696823).
* We did not save the shell flags, so we use a special or'd
* value here... this is mostly to clean up behind *other*
* callers of unwind(LERROR) here; exec.c has the regular case.
*/
if (Flag(FERREXIT) & 0x80) {
/* GNU bash does not run this trapsig */
trapsig(ksh_SIGERR);
Flag(FERREXIT) &= ~0x80;
}
/* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */
if (i == LEXIT || ((i == LERROR || i == LINTR) &&
sigtraps[ksh_SIGEXIT].trap &&
(!Flag(FTALKING) || Flag(FERREXIT)))) {
++trap_nested;
runtrap(&sigtraps[ksh_SIGEXIT], trap_nested == 1);
--trap_nested;
i = LLEAVE;
} else if (Flag(FERREXIT) == 1 && (i == LERROR || i == LINTR)) {
++trap_nested;
runtrap(&sigtraps[ksh_SIGERR], trap_nested == 1);
--trap_nested;
i = LLEAVE;
}
while (/* CONSTCOND */ 1) {
switch (e->type) {
case E_PARSE:
case E_FUNC:
case E_INCL:
case E_LOOP:
case E_ERRH:
kshlongjmp(e->jbuf, i);
/* NOTREACHED */
case E_NONE:
if (i == LINTR)
e->flags |= EF_FAKE_SIGDIE;
/* FALLTHROUGH */
default:
quitenv(NULL);
/*
* quitenv() may have reclaimed the memory
* used by source which will end badly when
* we jump to a function that expects it to
* be valid
*/
source = NULL;
}
}
}
/*
* Called from post_syscall() when a deferred singlestep is to be taken.
*/
void
deferred_singlestep_trap(caddr_t pc)
{
proc_t *p = ttoproc(curthread);
klwp_t *lwp = ttolwp(curthread);
pcb_t *pcb = &lwp->lwp_pcb;
uint_t fault = 0;
k_siginfo_t siginfo;
bzero(&siginfo, sizeof (siginfo));
/*
* If both NORMAL_STEP and WATCH_STEP are in
* effect, give precedence to NORMAL_STEP.
* If neither is set, user must have set the
* PS_T bit in %efl; treat this as NORMAL_STEP.
*/
if ((pcb->pcb_flags & NORMAL_STEP) ||
!(pcb->pcb_flags & WATCH_STEP)) {
siginfo.si_signo = SIGTRAP;
siginfo.si_code = TRAP_TRACE;
siginfo.si_addr = pc;
fault = FLTTRACE;
if (pcb->pcb_flags & WATCH_STEP)
(void) undo_watch_step(NULL);
} else {
fault = undo_watch_step(&siginfo);
}
pcb->pcb_flags &= ~(DEBUG_PENDING|NORMAL_STEP|WATCH_STEP);
if (fault) {
/*
* Remember the fault and fault adddress
* for real-time (SIGPROF) profiling.
*/
lwp->lwp_lastfault = fault;
lwp->lwp_lastfaddr = siginfo.si_addr;
/*
* If a debugger has declared this fault to be an
* event of interest, stop the lwp. Otherwise just
* deliver the associated signal.
*/
if (prismember(&p->p_fltmask, fault) &&
stop_on_fault(fault, &siginfo) == 0)
siginfo.si_signo = 0;
}
if (siginfo.si_signo)
trapsig(&siginfo, 1);
}
/*
* execute command tree
*/
int
execute(struct op * volatile t,
/* if XEXEC don't fork */
volatile int flags,
volatile int * volatile xerrok)
{
int i;
volatile int rv = 0, dummy = 0;
int pv[2];
const char ** volatile ap = NULL;
char ** volatile up;
const char *s, *ccp;
struct ioword **iowp;
struct tbl *tp = NULL;
char *cp;
if (t == NULL)
return (0);
/* Caller doesn't care if XERROK should propagate. */
if (xerrok == NULL)
xerrok = &dummy;
if ((flags&XFORK) && !(flags&XEXEC) && t->type != TPIPE)
/* run in sub-process */
return (exchild(t, flags & ~XTIME, xerrok, -1));
newenv(E_EXEC);
if (trap)
runtraps(0);
/* we want to run an executable, do some variance checks */
if (t->type == TCOM) {
/* check if this is 'var=<<EOF' */
if (
/* we have zero arguments, i.e. no programme to run */
t->args[0] == NULL &&
/* we have exactly one variable assignment */
t->vars[0] != NULL && t->vars[1] == NULL &&
/* we have exactly one I/O redirection */
t->ioact != NULL && t->ioact[0] != NULL &&
t->ioact[1] == NULL &&
/* of type "here document" (or "here string") */
(t->ioact[0]->flag & IOTYPE) == IOHERE &&
/* the variable assignment begins with a valid varname */
(ccp = skip_wdvarname(t->vars[0], true)) != t->vars[0] &&
/* and has no right-hand side (i.e. "varname=") */
ccp[0] == CHAR && ccp[1] == '=' && ccp[2] == EOS &&
/* plus we can have a here document content */
herein(t->ioact[0], &cp) == 0 && cp && *cp) {
char *sp = cp, *dp;
size_t n = ccp - t->vars[0] + 2, z;
/* drop redirection (will be garbage collected) */
t->ioact = NULL;
/* set variable to its expanded value */
z = strlen(cp) + 1;
if (notoktomul(z, 2) || notoktoadd(z * 2, n))
internal_errorf(Toomem, (unsigned long)-1);
dp = alloc(z * 2 + n, ATEMP);
memcpy(dp, t->vars[0], n);
t->vars[0] = dp;
dp += n;
while (*sp) {
*dp++ = QCHAR;
*dp++ = *sp++;
}
*dp = EOS;
/* free the expanded value */
afree(cp, APERM);
}
/*
* Clear subst_exstat before argument expansion. Used by
* null commands (see comexec() and c_eval()) and by c_set().
*/
subst_exstat = 0;
/* for $LINENO */
current_lineno = t->lineno;
/*
* POSIX says expand command words first, then redirections,
* and assignments last..
*/
up = eval(t->args, t->u.evalflags | DOBLANK | DOGLOB | DOTILDE);
if (flags & XTIME)
/* Allow option parsing (bizarre, but POSIX) */
timex_hook(t, &up);
ap = (const char **)up;
if (Flag(FXTRACE) && ap[0]) {
shf_puts(substitute(str_val(global("PS4")), 0),
shl_out);
for (i = 0; ap[i]; i++)
shf_fprintf(shl_out, "%s%c", ap[i],
ap[i + 1] ? ' ' : '\n');
shf_flush(shl_out);
}
if (ap[0])
tp = findcom(ap[0], FC_BI|FC_FUNC);
}
flags &= ~XTIME;
if (t->ioact != NULL || t->type == TPIPE || t->type == TCOPROC) {
e->savefd = alloc2(NUFILE, sizeof(short), ATEMP);
/* initialise to not redirected */
memset(e->savefd, 0, NUFILE * sizeof(short));
}
/* mark for replacement later (unless TPIPE) */
vp_pipest->flag |= INT_L;
/* do redirection, to be restored in quitenv() */
if (t->ioact != NULL)
for (iowp = t->ioact; *iowp != NULL; iowp++) {
if (iosetup(*iowp, tp) < 0) {
exstat = rv = 1;
/*
* Redirection failures for special commands
* cause (non-interactive) shell to exit.
*/
if (tp && tp->type == CSHELL &&
(tp->flag & SPEC_BI))
errorfz();
/* Deal with FERREXIT, quitenv(), etc. */
goto Break;
}
}
switch (t->type) {
case TCOM:
rv = comexec(t, tp, (const char **)ap, flags, xerrok);
break;
case TPAREN:
rv = execute(t->left, flags | XFORK, xerrok);
break;
case TPIPE:
flags |= XFORK;
flags &= ~XEXEC;
e->savefd[0] = savefd(0);
e->savefd[1] = savefd(1);
while (t->type == TPIPE) {
openpipe(pv);
/* stdout of curr */
ksh_dup2(pv[1], 1, false);
/**
* Let exchild() close pv[0] in child
* (if this isn't done, commands like
* (: ; cat /etc/termcap) | sleep 1
* will hang forever).
*/
exchild(t->left, flags | XPIPEO | XCCLOSE,
NULL, pv[0]);
/* stdin of next */
ksh_dup2(pv[0], 0, false);
closepipe(pv);
flags |= XPIPEI;
t = t->right;
}
/* stdout of last */
restfd(1, e->savefd[1]);
/* no need to re-restore this */
e->savefd[1] = 0;
/* Let exchild() close 0 in parent, after fork, before wait */
i = exchild(t, flags | XPCLOSE | XPIPEST, xerrok, 0);
if (!(flags&XBGND) && !(flags&XXCOM))
rv = i;
break;
case TLIST:
while (t->type == TLIST) {
execute(t->left, flags & XERROK, NULL);
t = t->right;
}
rv = execute(t, flags & XERROK, xerrok);
break;
case TCOPROC: {
#ifndef MKSH_NOPROSPECTOFWORK
sigset_t omask;
/*
* Block sigchild as we are using things changed in the
* signal handler
*/
sigprocmask(SIG_BLOCK, &sm_sigchld, &omask);
e->type = E_ERRH;
if ((i = kshsetjmp(e->jbuf))) {
sigprocmask(SIG_SETMASK, &omask, NULL);
quitenv(NULL);
unwind(i);
/* NOTREACHED */
}
#endif
/* Already have a (live) co-process? */
if (coproc.job && coproc.write >= 0)
errorf("coprocess already exists");
/* Can we re-use the existing co-process pipe? */
coproc_cleanup(true);
/* do this before opening pipes, in case these fail */
e->savefd[0] = savefd(0);
e->savefd[1] = savefd(1);
openpipe(pv);
if (pv[0] != 0) {
ksh_dup2(pv[0], 0, false);
close(pv[0]);
}
coproc.write = pv[1];
coproc.job = NULL;
if (coproc.readw >= 0)
ksh_dup2(coproc.readw, 1, false);
else {
openpipe(pv);
coproc.read = pv[0];
ksh_dup2(pv[1], 1, false);
/* closed before first read */
coproc.readw = pv[1];
coproc.njobs = 0;
/* create new coprocess id */
++coproc.id;
}
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
/* no more need for error handler */
e->type = E_EXEC;
#endif
/*
* exchild() closes coproc.* in child after fork,
* will also increment coproc.njobs when the
* job is actually created.
*/
flags &= ~XEXEC;
exchild(t->left, flags | XBGND | XFORK | XCOPROC | XCCLOSE,
NULL, coproc.readw);
break;
}
case TASYNC:
/*
* XXX non-optimal, I think - "(foo &)", forks for (),
* forks again for async... parent should optimise
* this to "foo &"...
*/
rv = execute(t->left, (flags&~XEXEC)|XBGND|XFORK, xerrok);
break;
case TOR:
case TAND:
rv = execute(t->left, XERROK, xerrok);
if ((rv == 0) == (t->type == TAND))
rv = execute(t->right, XERROK, xerrok);
flags |= XERROK;
if (xerrok)
*xerrok = 1;
break;
case TBANG:
rv = !execute(t->right, XERROK, xerrok);
flags |= XERROK;
if (xerrok)
*xerrok = 1;
break;
case TDBRACKET: {
Test_env te;
te.flags = TEF_DBRACKET;
te.pos.wp = t->args;
te.isa = dbteste_isa;
te.getopnd = dbteste_getopnd;
te.eval = test_eval;
te.error = dbteste_error;
rv = test_parse(&te);
break;
}
case TFOR:
case TSELECT: {
volatile bool is_first = true;
ap = (t->vars == NULL) ? e->loc->argv + 1 :
(const char **)eval((const char **)t->vars,
DOBLANK | DOGLOB | DOTILDE);
e->type = E_LOOP;
while ((i = kshsetjmp(e->jbuf))) {
if ((e->flags&EF_BRKCONT_PASS) ||
(i != LBREAK && i != LCONTIN)) {
quitenv(NULL);
unwind(i);
} else if (i == LBREAK) {
rv = 0;
goto Break;
}
}
/* in case of a continue */
rv = 0;
if (t->type == TFOR) {
while (*ap != NULL) {
setstr(global(t->str), *ap++, KSH_UNWIND_ERROR);
rv = execute(t->left, flags & XERROK, xerrok);
}
} else {
/* TSELECT */
for (;;) {
if (!(ccp = do_selectargs(ap, is_first))) {
rv = 1;
break;
}
is_first = false;
setstr(global(t->str), ccp, KSH_UNWIND_ERROR);
execute(t->left, flags & XERROK, xerrok);
}
}
break;
}
case TWHILE:
case TUNTIL:
e->type = E_LOOP;
while ((i = kshsetjmp(e->jbuf))) {
if ((e->flags&EF_BRKCONT_PASS) ||
(i != LBREAK && i != LCONTIN)) {
quitenv(NULL);
unwind(i);
} else if (i == LBREAK) {
rv = 0;
goto Break;
}
}
/* in case of a continue */
rv = 0;
while ((execute(t->left, XERROK, NULL) == 0) ==
(t->type == TWHILE))
rv = execute(t->right, flags & XERROK, xerrok);
break;
case TIF:
case TELIF:
if (t->right == NULL)
/* should be error */
break;
rv = execute(t->left, XERROK, NULL) == 0 ?
execute(t->right->left, flags & XERROK, xerrok) :
execute(t->right->right, flags & XERROK, xerrok);
break;
case TCASE:
i = 0;
ccp = evalstr(t->str, DOTILDE);
for (t = t->left; t != NULL && t->type == TPAT; t = t->right) {
for (ap = (const char **)t->vars; *ap; ap++) {
if (i || ((s = evalstr(*ap, DOTILDE|DOPAT)) &&
gmatchx(ccp, s, false))) {
rv = execute(t->left, flags & XERROK,
xerrok);
i = 0;
switch (t->u.charflag) {
case '&':
i = 1;
/* FALLTHROUGH */
case '|':
goto TCASE_next;
}
goto TCASE_out;
}
}
i = 0;
TCASE_next:
/* empty */;
}
TCASE_out:
break;
case TBRACE:
rv = execute(t->left, flags & XERROK, xerrok);
break;
case TFUNCT:
rv = define(t->str, t);
break;
case TTIME:
/*
* Clear XEXEC so nested execute() call doesn't exit
* (allows "ls -l | time grep foo").
*/
rv = timex(t, flags & ~XEXEC, xerrok);
break;
case TEXEC:
/* an eval'd TCOM */
s = t->args[0];
up = makenv();
restoresigs();
cleanup_proc_env();
{
union mksh_ccphack cargs;
cargs.ro = t->args;
execve(t->str, cargs.rw, up);
rv = errno;
}
if (rv == ENOEXEC)
scriptexec(t, (const char **)up);
else
errorf("%s: %s", s, cstrerror(rv));
}
Break:
exstat = rv & 0xFF;
if (vp_pipest->flag & INT_L) {
unset(vp_pipest, 1);
vp_pipest->flag = DEFINED | ISSET | INTEGER | RDONLY |
ARRAY | INT_U;
vp_pipest->val.i = rv;
}
/* restores IO */
quitenv(NULL);
if ((flags&XEXEC))
/* exit child */
unwind(LEXIT);
if (rv != 0 && !(flags & XERROK) &&
(xerrok == NULL || !*xerrok)) {
if (Flag(FERREXIT) & 0x80) {
/* inside eval */
Flag(FERREXIT) = 0;
} else {
trapsig(ksh_SIGERR);
if (Flag(FERREXIT))
unwind(LERROR);
}
}
return (rv);
}
/*
* wait for job to complete or change state
*
* If jobs are compiled in then this routine expects sigchld to be blocked.
*/
static int
j_waitj(Job *j,
int flags, /* see JW_* */
const char *where)
{
int rv;
/*
* No auto-notify on the job we are waiting on.
*/
j->flags |= JF_WAITING;
if (flags & JW_ASYNCNOTIFY)
j->flags |= JF_W_ASYNCNOTIFY;
if (!Flag(FMONITOR))
flags |= JW_STOPPEDWAIT;
while ((volatile int) j->state == PRUNNING ||
((flags & JW_STOPPEDWAIT) && (volatile int) j->state == PSTOPPED)) {
sigsuspend(&sm_default);
if (fatal_trap) {
int oldf = j->flags & (JF_WAITING|JF_W_ASYNCNOTIFY);
j->flags &= ~(JF_WAITING|JF_W_ASYNCNOTIFY);
runtraps(TF_FATAL);
j->flags |= oldf; /* not reached... */
}
if ((flags & JW_INTERRUPT) && (rv = trap_pending())) {
j->flags &= ~(JF_WAITING|JF_W_ASYNCNOTIFY);
return -rv;
}
}
j->flags &= ~(JF_WAITING|JF_W_ASYNCNOTIFY);
if (j->flags & JF_FG) {
int status;
j->flags &= ~JF_FG;
#ifdef JOBS
if (Flag(FMONITOR) && ttypgrp_ok && j->pgrp) {
/*
* Save the tty's current pgrp so it can be restored
* when the job is foregrounded. This is to
* deal with things like the GNU su which does
* a fork/exec instead of an exec (the fork means
* the execed shell gets a different pid from its
* pgrp, so naturally it sets its pgrp and gets hosed
* when it gets foregrounded by the parent shell, which
* has restored the tty's pgrp to that of the su
* process).
*/
if (j->state == PSTOPPED &&
(j->saved_ttypgrp = tcgetpgrp(tty_fd)) >= 0)
j->flags |= JF_SAVEDTTYPGRP;
if (tcsetpgrp(tty_fd, our_pgrp) < 0) {
warningf(true,
"j_waitj: tcsetpgrp(%d, %d) failed: %s",
tty_fd, (int) our_pgrp,
strerror(errno));
}
if (j->state == PSTOPPED) {
j->flags |= JF_SAVEDTTY;
tcgetattr(tty_fd, &j->ttystate);
}
}
#endif /* JOBS */
if (tty_fd >= 0) {
/* Only restore tty settings if job was originally
* started in the foreground. Problems can be
* caused by things like `more foobar &' which will
* typically get and save the shell's vi/emacs tty
* settings before setting up the tty for itself;
* when more exits, it restores the `original'
* settings, and things go down hill from there...
*/
if (j->state == PEXITED && j->status == 0 &&
(j->flags & JF_USETTYMODE)) {
tcgetattr(tty_fd, &tty_state);
} else {
tcsetattr(tty_fd, TCSADRAIN, &tty_state);
/* Don't use tty mode if job is stopped and
* later restarted and exits. Consider
* the sequence:
* vi foo (stopped)
* ...
* stty something
* ...
* fg (vi; ZZ)
* mode should be that of the stty, not what
* was before the vi started.
*/
if (j->state == PSTOPPED)
j->flags &= ~JF_USETTYMODE;
}
}
#ifdef JOBS
/* If it looks like user hit ^C to kill a job, pretend we got
* one too to break out of for loops, etc. (at&t ksh does this
* even when not monitoring, but this doesn't make sense since
* a tty generated ^C goes to the whole process group)
*/
status = j->last_proc->status;
if (Flag(FMONITOR) && j->state == PSIGNALLED &&
WIFSIGNALED(status) &&
(sigtraps[WTERMSIG(status)].flags & TF_TTY_INTR))
trapsig(WTERMSIG(status));
#endif /* JOBS */
}
j_usrtime = j->usrtime;
j_systime = j->systime;
rv = j->status;
if (!(flags & JW_ASYNCNOTIFY) &&
(!Flag(FMONITOR) || j->state != PSTOPPED)) {
j_print(j, JP_SHORT, shl_out);
shf_flush(shl_out);
}
if (j->state != PSTOPPED &&
(!Flag(FMONITOR) || !(flags & JW_ASYNCNOTIFY)))
remove_job(j, where);
return rv;
}
