/* KILLTASK -- Abort the currently executing task. Only call this when a task
* is to be killed spontaneously, as from interrupt, not when it is just dying
* due to a "bye" or eof.
* Close all pipes and pseudofiles, being careful not to close any that
* are real stdio files.
* Note that our function is to kill an external task, not the process in which
* it resides. The process is left running in the cache in case it is needed
* again.
*/
void
killtask (
register struct task *tp
)
{
char buf[128];
/* Print stack trace, with arguments.
*/
if (!(tp->t_ltp->lt_flags<_INVIS) && !(firstask->t_flags&T_BATCH) &&
!(strcmp (tp->t_ltp->lt_lname, "error") == 0))
printcall (currentask->t_stderr, tp);
/* If task is running in a subprocess, interrupt it and read the ERROR
* message. Not certain there isn't some case where this could cause
* deadlock, but it does not seem so. Interrupts are disabled during
* process startup. If task issues ERROR then it is popped before
* we are called, without issuing the signal.
*/
if (tp->t_pid != -1) {
fflush (tp->t_out);
c_prsignal (tp->t_pid, X_INT);
fgets (buf, 128, tp->t_in);
}
iofinish (tp);
}
/* SHUTDOWN -- Call this to exit gracefully from the whole cl; never return.
* Write out any remaining PF_UPDATE'd pfiles by restoring topd to just above
* first task unless we are in batch mode, then just flush io and die..
* So that the restor will include the cl's pfile and any other pfiles that
* might have been cached or assigned into, we force its topd to be
* below its pfile head. See the "pfp < topdp" loop in restor().
* Don't bother with restor'ing if BATCH since we don't want to write out
* anything then anyway.
*/
static void
shutdown (void)
{
float cpu, clk;
pr_dumpcache (0, YES); /* flush process cache */
clgflush(); /* flush graphics output */
if (firstask->t_flags & T_BATCH) {
iofinish (currentask);
if (notify()) {
cpu = (float)c_cputime(cpustart) / 1000.;
clk = (float)c_clktime(clkstart);
fprintf (stderr, "\n[%d] done %.1f %.0m %d%%\n", bkgno,
cpu, clk/60., (int)((clk > 0 ? cpu / clk : 0.) * 100.));
}
} else {
firstask->t_topd = dereference (firstask->t_ltp) + LTASKSIZ;
restor (firstask);
}
yy_startblock (LOG); /* flush and close log */
close_logfile (logfile());
clexit();
}
/* ARGSUSED */
void
onint (
int *vex, /* virtual exception code */
int (**next_handler)(void) /* next handler to be called */
)
{
if (firstask->t_flags & T_BATCH) {
/* Batch task.
*/
iofinish (currentask);
bkg_abort();
clexit();
} else if (currentask->t_flags & (T_SCRIPT|T_CL|T_BUILTIN)) {
/* CL task.
*/
cl_error (E_UERR, "interrupt!!!");
} else {
/* External task connected via IPC. Pass the interrupt on to
* the child.
*/
c_prsignal (currentask->t_pid, X_INT);
/* Cancel any output and disable i/o on the tasks pseudofiles.
* This is necessary to cancel any i/o still buffered in the
* IPC channel. Commonly when the task is writing to STDOUT,
* for example, the CL will be writing the last buffer sent
* to the terminal, while the task waits after having already
* pushed the next buffer into the IPC. When we resume reading
* from the task we will see this buffered output on the next
* read and we wish to discard it. Leave STDERR connected to
* give a path to the terminal for recovery actions such as
* turning standout or graphics mode off. This gives the task
* a chance to cleanup but does not permit full recovery. The
* pseudofiles will be reconnected for the next task run.
*/
c_fseti (fileno(stdout), F_CANCEL, OK);
c_fseti (fileno(currentask->t_in), F_CANCEL, OK);
c_fseti (fileno(currentask->t_out), F_CANCEL, OK);
c_prredir (currentask->t_pid, STDIN, 0);
c_prredir (currentask->t_pid, STDOUT, 0);
/* If a subprocess is repeatedly interrupted we assume that it
* is hung in a loop and abort, advising the user to kill the
* process.
*/
if (++ninterrupts >= MAX_INTERRUPTS)
cl_error (E_UERR, "subprocess is hung; should be killed");
else
longjmp (intenv, 1);
}
*next_handler = NULL;
}
/* ONEOF -- "on eof" (not "one of"):
* The current task has issued eof, either directly or via the "bye" command.
* Flush out all pending io, copy working pfile back to original if have one,
* pop a state back to the previous state and restore its environment.
* Avoid calling effecmode() if called from a builtin task since builtins
* do not have the "mode" parameter.
*
* If currentask is the first cl or we are batch, then we are truely done.
* Return true to the caller (EXECUTE), causing a return to the main.
*/
void
oneof (void)
{
register struct pfile *pfp;
register struct package *pkp;
static int nerrs = 0;
int flags;
if (cldebug)
eprintf ("received `%s' from `%s'\n", yeof ? "eof" : "bye",
currentask == firstask ? "root" : currentask->t_ltp->lt_lname);
if (!(firstask->t_flags & T_BATCH))
if (currentask == firstask && !gologout && !loggingout &&
isatty (fileno (stdin)) && nerrs++ < 8)
cl_error (E_UERR, "use `logout' to log out of the CL");
flags = currentask->t_flags;
if (!(flags & (T_BUILTIN|T_CL|T_SCRIPT|T_BATCH)))
fflush (currentask->t_out);
iofinish (currentask);
/* Copy back the main pfile and any pset-param files. If the task
* which has terminated is a package script task, fix up the pfile
* pointer in the package descriptor to point to the updated pset.
*/
if (currentask->t_ltp->lt_flags & LT_PFILE) {
pfcopyback (pfp = currentask->t_pfp);
if (currentask->t_ltp->lt_flags & LT_DEFPCK)
if ((pkp = pacfind(currentask->t_ltp->lt_lname)))
if (pkp->pk_pfp == pfp)
pkp->pk_pfp = pfp->pf_oldpfp;
for (pfp = pfp->pf_npset; pfp != NULL; pfp = pfp->pf_npset)
pfcopyback (pfp);
}
if (currentask == firstask)
alldone = 1;
else {
currentask = poptask();
if (currentask->t_flags & T_BATCH)
alldone = 1;
}
restor (currentask); /* restore environment */
}
/* BKG_ABORT -- Called by onint() in main.c when we get interrupted while
* running as a bkg job. Kill any and all background CL's WE may have
* started, flush io, close any open pipe files, remove our job seq lock
* file, kill all tasks back to the one that started us as background and
* write a message on stderr.
*/
void
bkg_abort (void)
{
register int job;
register struct task *tp;
for (job=1; job <= NBKG; job++)
if (busy (job))
bkg_kill (job);
iofinish (currentask);
delpipes (0);
tp = currentask;
while (!(tp->t_flags & T_BATCH)) {
killtask (tp);
tp = poptask();
}
fprintf (stderr, "\n[%d] killed\n", bkgno);
}
void
cl_error (int errtype, char *diagstr, ...)
{
va_list args;
register struct task *tp;
static int nfatal = 0;
static int break_locks = 1;
va_start (args, diagstr);
/* (Re)-initialize the error action.
*/
erract_init();
/* Safety measure, in the event of error recursion.
*/
if (err_abort) {
if (nfatal)
clexit();
if (errlev++ > 2) {
nfatal++;
eprintf ("Error recursion. Cl dies.\n");
clexit();
}
}
/* The first setjmp(errenv) is not done until we start the main loop.
* Set validerrenv when start the first interactive cl to indicate that
* we may safely longjmp back to main's loop on an error. ERRENV is
* not set for bkg jobs since error restart is not permitted.
*/
if (!validerrenv && !(firstask->t_flags & T_BATCH)) {
nfatal++;
u_doprnt (diagstr, &args, currentask->t_stderr);
if (errtype & E_P)
perror ("\nOS errmsg");
else
eprintf ("\n");
eprintf ("Fatal startup error. CL dies.\n");
clexit();
}
/* Any error occurring during logout is fatal.
*/
if (loggingout || gologout) {
nfatal++;
u_doprnt (diagstr, &args, currentask->t_stderr);
if (errtype & E_P)
perror ("\nOS errmsg");
else
eprintf ("\n");
eprintf ("Fatal logout error. CL dies.\n");
clexit();
}
/* Perform any ONERROR error recovery in the vos first. Initialize
* the error recovery mechanism (necessary since the iraf main is not
* being allowed to do error recovery).
*/
c_xonerr (1);
XER_RESET(); /* TODO: move into LIBC interface */
/* Clear terminal raw mode if still set. */
c_fseti ((XINT)STDIN, F_RAW, NO);
if (firstask->t_flags & T_BATCH)
eprintf ("\n[%d] ", bkgno);
if (errtype & E_IERR)
eprintf ("INTERNAL ");
if (errtype & E_FERR)
eprintf ("FATAL ");
/* Disable error tracing if requested.
*/
if (err_trace == YES || (errtype & E_UERR)) {
if (currentask->t_flags & T_SCRIPT &&
currentask->t_flags & T_INTERACTIVE)
eprintf ("ERROR on line %d: ", errorline);
else
eprintf ("ERROR: ");
u_doprnt (diagstr, &args, currentask->t_stderr);
if (errtype & E_P)
perror ("\nOS errmsg");
else
eprintf ("\n");
}
/* Log the error message if from a script or an executable.
*/
if (!errlog && keeplog() && log_errors()) {
if (currentask->t_flags & T_SCRIPT || currentask->t_pid != -1) {
PKCHAR buf[SZ_LINE+1];
FILE *fp;
int fd;
fd = c_stropen (buf, SZ_LINE, NEW_FILE);
fp = fdopen (fd, "w");
fprintf (fp, "ERROR on line %d: ", errorline);
u_doprnt (diagstr, &args, fp);
fclose (fp);
c_close (fd);
putlog (currentask, c_strpak (buf, (char *)buf, SZ_LINE));
}
}
errlog = 0;
/* Initialize the current command block but do not log the command
* which aborted. If we're only trapping errors and not fully
* recovering, don't reset the command block so we have the option
* to continue execution.
*/
if ((err_abort == YES && do_error == NO) ||
(do_error == YES || (errtype & E_UERR)))
yy_startblock (NOLOG);
/* Delete all pipefiles. Call iofinish() first as some OS's may
* require that the files be closed before they can be deleted.
*/
for (tp=currentask; !(tp->t_flags & T_INTERACTIVE); tp=next_task(tp)) {
iofinish (tp);
if (tp == firstask)
break;
}
delpipes (0);
/* Do not go on if this is a fatal error or we are unattended.
*/
if (errtype & E_FERR) {
nfatal++;
pr_dumpcache (0, break_locks);
clexit();
} else if (firstask->t_flags & T_BATCH)
clshutdown();
/* Reset state variables. */
/* Most of these probably needn't be reset, but we'll play
* it safe.
*/
nestlevel = 0; /* set nesting to 0 */
offsetmode (0); /* offset mode to index */
ncaseval = 0; /* number of case values */
n_indexes = 0;
imloopset = 0; /* in an implicit loop */
n_oarr = 0; /* implicit loop indicators */
i_oarr = 0;
maybeindex = 0; /* sexagesimal/index range */
parse_state = PARSE_FREE;
if (last_parm) { /* have we tried to add a param */
last_parm->p_np = NULL;
currentask->t_pfp->pf_lastpp = last_parm;
last_parm = NULL;
}
/* Set the error flag. */
errcom.errflag++;
errcom.nhandlers++;
/* Get back to an interactive state. We simply return if we're
* trapping errors except when processing a E_UERR. These type
* messages come from the CL itself and require user attention to
* correct (e.g. task not found, parameter type/syntax errors, etc).
* The calling procedure is not expecting us to return, so we cannot
* properly trap without rewriting the calling code.
*/
if (cltrace) {
eprintf ("cl_error: abort=%d beep=%d trace=%d flpr=%d\n",
err_abort, err_beep, err_trace, err_flpr);
eprintf ("cl_error: code=%d do_err=%d errtype=%d/%d task='%s'\n",
errcom.errcode, do_error, errtype, errtype&E_UERR,
currentask->t_ltp->lt_lname);
}
if ((err_abort == YES && do_error == NO) ||
(do_error == YES || (errtype & E_UERR))) {
extern ErrCom errcom;
register struct param *pp;
if (!errcom.errcode && (errtype & E_UERR)) {
errcom.errcode = errtype;
strcpy (errcom.errmsg, diagstr);
strcpy (errcom.task, currentask->t_ltp->lt_lname);
pp = paramfind (firstask->t_pfp, "$errno", 0, YES);
pp->p_val.v_i = errcom.errcode;
pp = paramfind (firstask->t_pfp, "$errmsg", 0, YES);
pp->p_val.v_s = errcom.errmsg;
pp = paramfind (firstask->t_pfp, "$errtask", 0, YES);
pp->p_val.v_s = errcom.task;
}
taskunwind();
/* If an abort occurs while interrupts are disabled they will
* never get reenabled unless we do so here.
*/
intr_reset();
/* Go back to main loop in main().
*/
va_end (args);
longjmp (errenv, 1);
} else {
va_end (args);
return;
}
}
