void
evalbackcmd(union node *n, struct backcmd *result)
{
int pip[2];
struct job *jp;
struct stackmark smark; /* unnecessary */
setstackmark(&smark);
result->fd = -1;
result->buf = NULL;
result->nleft = 0;
result->jp = NULL;
if (nflag || n == NULL) {
goto out;
}
#ifdef notyet
/*
* For now we disable executing builtins in the same
* context as the shell, because we are not keeping
* enough state to recover from changes that are
* supposed only to affect subshells. eg. echo "`cd /`"
*/
if (n->type == NCMD) {
exitstatus = oexitstatus;
evalcommand(n, EV_BACKCMD, result);
} else
#endif
{
INTOFF;
if (sh_pipe(pip) < 0)
error("Pipe call failed");
jp = makejob(n, 1);
if (forkshell(jp, n, FORK_NOJOB) == 0) {
FORCEINTON;
close(pip[0]);
if (pip[1] != 1) {
close(1);
copyfd(pip[1], 1, 1, 0);
close(pip[1]);
}
eflag = 0;
evaltree(n, EV_EXIT);
/* NOTREACHED */
}
close(pip[1]);
result->fd = pip[0];
result->jp = jp;
INTON;
}
out:
popstackmark(&smark);
TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
result->fd, result->buf, result->nleft, result->jp));
}
void
evalbackcmd(union node *n, struct backcmd *result)
{
int pip[2];
struct job *jp;
struct stackmark smark; /* unnecessary */
setstackmark(&smark);
result->fd = -1;
result->buf = NULL;
result->nleft = 0;
result->jp = NULL;
if (n == NULL) {
exitstatus = 0;
goto out;
}
if (n->type == NCMD) {
exitstatus = oexitstatus;
evalcommand(n, EV_BACKCMD, result);
} else {
exitstatus = 0;
if (pipe(pip) < 0)
error("Pipe call failed: %s", strerror(errno));
jp = makejob(n, 1);
if (forkshell(jp, n, FORK_NOJOB) == 0) {
FORCEINTON;
close(pip[0]);
if (pip[1] != 1) {
dup2(pip[1], 1);
close(pip[1]);
}
evaltree(n, EV_EXIT);
}
close(pip[1]);
result->fd = pip[0];
result->jp = jp;
}
out:
popstackmark(&smark);
TRACE(("evalbackcmd done: fd=%d buf=%p nleft=%d jp=%p\n",
result->fd, result->buf, result->nleft, result->jp));
}
void
evalbackcmd(union node *n, struct backcmd *result)
{
int pip[2];
struct job *jp;
struct stackmark smark;
struct jmploc jmploc;
struct jmploc *savehandler;
struct localvar *savelocalvars;
setstackmark(&smark);
result->fd = -1;
result->buf = NULL;
result->nleft = 0;
result->jp = NULL;
if (n == NULL) {
exitstatus = 0;
goto out;
}
exitstatus = oexitstatus;
if (is_valid_fast_cmdsubst(n)) {
savelocalvars = localvars;
localvars = NULL;
forcelocal++;
savehandler = handler;
if (setjmp(jmploc.loc)) {
if (exception == EXERROR || exception == EXEXEC)
exitstatus = 2;
else if (exception != 0) {
handler = savehandler;
forcelocal--;
poplocalvars();
localvars = savelocalvars;
longjmp(handler->loc, 1);
}
} else {
handler = &jmploc;
evalcommand(n, EV_BACKCMD, result);
}
handler = savehandler;
forcelocal--;
poplocalvars();
localvars = savelocalvars;
} else {
if (pipe(pip) < 0)
error("Pipe call failed: %s", strerror(errno));
jp = makejob(n, 1);
if (forkshell(jp, n, FORK_NOJOB) == 0) {
FORCEINTON;
close(pip[0]);
if (pip[1] != 1) {
dup2(pip[1], 1);
close(pip[1]);
}
evaltree(n, EV_EXIT);
}
close(pip[1]);
result->fd = pip[0];
result->jp = jp;
}
out:
popstackmark(&smark);
TRACE(("evalbackcmd done: fd=%d buf=%p nleft=%d jp=%p\n",
result->fd, result->buf, result->nleft, result->jp));
}
void
evaltree(union node *n, int flags)
{
int do_etest;
union node *next;
struct stackmark smark;
setstackmark(&smark);
do_etest = 0;
if (n == NULL) {
TRACE(("evaltree(NULL) called\n"));
exitstatus = 0;
goto out;
}
do {
next = NULL;
#ifndef NO_HISTORY
displayhist = 1; /* show history substitutions done with fc */
#endif
TRACE(("evaltree(%p: %d) called\n", (void *)n, n->type));
switch (n->type) {
case NSEMI:
evaltree(n->nbinary.ch1, flags & ~EV_EXIT);
if (evalskip)
goto out;
next = n->nbinary.ch2;
break;
case NAND:
evaltree(n->nbinary.ch1, EV_TESTED);
if (evalskip || exitstatus != 0) {
goto out;
}
next = n->nbinary.ch2;
break;
case NOR:
evaltree(n->nbinary.ch1, EV_TESTED);
if (evalskip || exitstatus == 0)
goto out;
next = n->nbinary.ch2;
break;
case NREDIR:
evalredir(n, flags);
break;
case NSUBSHELL:
evalsubshell(n, flags);
do_etest = !(flags & EV_TESTED);
break;
case NBACKGND:
evalsubshell(n, flags);
break;
case NIF: {
evaltree(n->nif.test, EV_TESTED);
if (evalskip)
goto out;
if (exitstatus == 0)
next = n->nif.ifpart;
else if (n->nif.elsepart)
next = n->nif.elsepart;
else
exitstatus = 0;
break;
}
case NWHILE:
case NUNTIL:
evalloop(n, flags & ~EV_EXIT);
break;
case NFOR:
evalfor(n, flags & ~EV_EXIT);
break;
case NCASE:
next = evalcase(n);
break;
case NCLIST:
next = n->nclist.body;
break;
case NCLISTFALLTHRU:
if (n->nclist.body) {
evaltree(n->nclist.body, flags & ~EV_EXIT);
if (evalskip)
goto out;
}
next = n->nclist.next;
break;
case NDEFUN:
defun(n->narg.text, n->narg.next);
exitstatus = 0;
break;
case NNOT:
evaltree(n->nnot.com, EV_TESTED);
if (evalskip)
goto out;
exitstatus = !exitstatus;
break;
case NPIPE:
evalpipe(n);
do_etest = !(flags & EV_TESTED);
break;
case NCMD:
evalcommand(n, flags, (struct backcmd *)NULL);
do_etest = !(flags & EV_TESTED);
break;
default:
out1fmt("Node type = %d\n", n->type);
flushout(&output);
break;
}
n = next;
popstackmark(&smark);
setstackmark(&smark);
} while (n != NULL);
out:
popstackmark(&smark);
if (pendingsig)
dotrap();
if (eflag && exitstatus != 0 && do_etest)
exitshell(exitstatus);
if (flags & EV_EXIT)
exraise(EXEXIT);
}
void
evaltree(union node *n, int flags)
{
int checkexit = 0;
void (*evalfn)(union node *, int);
unsigned isor;
int status;
if (n == NULL) {
//TRACE(("evaltree(NULL) called\n"));
goto out;
}
#ifndef SMALL
displayhist = 1; /* show history substitutions done with fc */
#endif
TRACE(("pid %d, evaltree(%p: %d, %d, %p) called\n",
getpid(), n, n->type, flags));
switch (n->type) {
default:
#ifdef DEBUG
#ifndef USE_GLIBC_STDIO
flushout(out1);
#endif
break;
#endif
case NNOT:
evaltree(n->nnot.com, EV_TESTED);
status = !exitstatus;
goto setstatus;
case NREDIR:
expredir(n->nredir.redirect);
status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
if (!status) {
evaltree(n->nredir.n, flags & EV_TESTED);
status = exitstatus;
}
popredir(0);
goto setstatus;
case NCMD:
#ifdef notyet
if (eflag && !(flags & EV_TESTED))
checkexit = ~0;
evalcommand(n, flags, (struct backcmd *)NULL);
break;
#else
evalfn = evalcommand;
checkexit:
if (eflag && !(flags & EV_TESTED))
checkexit = ~0;
goto calleval;
#endif
case NFOR:
evalfn = evalfor;
goto calleval;
case NWHILE:
case NUNTIL:
evalfn = evalloop;
goto calleval;
case NSUBSHELL:
case NBACKGND:
evalfn = evalsubshell;
evalsubshell (n, flags);
case NPIPE:
evalfn = evalpipe;
#ifdef notyet
if (eflag && !(flags & EV_TESTED))
checkexit = ~0;
goto calleval;
#else
goto checkexit;
#endif
case NCASE:
evalfn = evalcase;
goto calleval;
case NAND:
case NOR:
case NSEMI:
#if NAND + 1 != NOR
#error NAND + 1 != NOR
#endif
#if NOR + 1 != NSEMI
#error NOR + 1 != NSEMI
#endif
isor = n->type - NAND;
evaltree(
n->nbinary.ch1,
(flags | ((isor >> 1) - 1)) & EV_TESTED
);
if (!exitstatus == isor)
break;
if (!evalskip) {
n = n->nbinary.ch2;
evaln:
evaltree(n, flags);
break;
calleval:
evalfn(n, flags);
break;
}
break;
case NIF:
evaltree(n->nif.test, EV_TESTED);
if (evalskip)
break;
if (exitstatus == 0) {
n = n->nif.ifpart;
goto evaln;
} else if (n->nif.elsepart) {
n = n->nif.elsepart;
goto evaln;
}
goto success;
case NDEFUN:
defun(n->narg.text, n->narg.next);
success:
status = 0;
setstatus:
exitstatus = status;
break;
}
out:
if ((checkexit & exitstatus) ||
(pendingsigs && dotrap()) ||
(flags & EV_EXIT))
exraise(EXEXIT);
}
void
evaltree(union node *n, int flags)
{
int do_etest;
do_etest = 0;
if (n == NULL) {
TRACE(("evaltree(NULL) called\n"));
exitstatus = 0;
goto out;
}
#ifndef NO_HISTORY
displayhist = 1; /* show history substitutions done with fc */
#endif
TRACE(("evaltree(%p: %d) called\n", (void *)n, n->type));
switch (n->type) {
case NSEMI:
evaltree(n->nbinary.ch1, flags & ~EV_EXIT);
if (evalskip)
goto out;
evaltree(n->nbinary.ch2, flags);
break;
case NAND:
evaltree(n->nbinary.ch1, EV_TESTED);
if (evalskip || exitstatus != 0) {
goto out;
}
evaltree(n->nbinary.ch2, flags);
break;
case NOR:
evaltree(n->nbinary.ch1, EV_TESTED);
if (evalskip || exitstatus == 0)
goto out;
evaltree(n->nbinary.ch2, flags);
break;
case NREDIR:
oexitstatus = exitstatus;
expredir(n->nredir.redirect);
redirect(n->nredir.redirect, REDIR_PUSH);
evaltree(n->nredir.n, flags);
popredir();
break;
case NSUBSHELL:
evalsubshell(n, flags);
do_etest = !(flags & EV_TESTED);
break;
case NBACKGND:
evalsubshell(n, flags);
break;
case NIF: {
evaltree(n->nif.test, EV_TESTED);
if (evalskip)
goto out;
if (exitstatus == 0)
evaltree(n->nif.ifpart, flags);
else if (n->nif.elsepart)
evaltree(n->nif.elsepart, flags);
else
exitstatus = 0;
break;
}
case NWHILE:
case NUNTIL:
evalloop(n, flags & ~EV_EXIT);
break;
case NFOR:
evalfor(n, flags & ~EV_EXIT);
break;
case NCASE:
evalcase(n, flags);
break;
case NDEFUN:
defun(n->narg.text, n->narg.next);
exitstatus = 0;
break;
case NNOT:
evaltree(n->nnot.com, EV_TESTED);
exitstatus = !exitstatus;
break;
case NPIPE:
evalpipe(n);
do_etest = !(flags & EV_TESTED);
break;
case NCMD:
evalcommand(n, flags, (struct backcmd *)NULL);
do_etest = !(flags & EV_TESTED);
break;
default:
out1fmt("Node type = %d\n", n->type);
flushout(&output);
break;
}
out:
if (pendingsigs)
dotrap();
if ((flags & EV_EXIT) || (eflag && exitstatus != 0 && do_etest))
exitshell(exitstatus);
}
void
evaltree(shinstance *psh, union node *n, int flags)
{
if (n == NULL) {
TRACE((psh, "evaltree(NULL) called\n"));
psh->exitstatus = 0;
goto out;
}
#ifndef SMALL
psh->displayhist = 1; /* show history substitutions done with fc */
#endif
TRACE((psh, "pid %d, evaltree(%p: %d, %d) called\n",
sh_getpid(psh), n, n->type, flags));
switch (n->type) {
case NSEMI:
evaltree(psh, n->nbinary.ch1, flags & EV_TESTED);
if (psh->evalskip)
goto out;
evaltree(psh, n->nbinary.ch2, flags);
break;
case NAND:
evaltree(psh, n->nbinary.ch1, EV_TESTED);
if (psh->evalskip || psh->exitstatus != 0)
goto out;
evaltree(psh, n->nbinary.ch2, flags);
break;
case NOR:
evaltree(psh, n->nbinary.ch1, EV_TESTED);
if (psh->evalskip || psh->exitstatus == 0)
goto out;
evaltree(psh, n->nbinary.ch2, flags);
break;
case NREDIR:
expredir(psh, n->nredir.redirect);
redirect(psh, n->nredir.redirect, REDIR_PUSH);
evaltree(psh, n->nredir.n, flags);
popredir(psh);
break;
case NSUBSHELL:
evalsubshell(psh, n, flags);
break;
case NBACKGND:
evalsubshell(psh, n, flags);
break;
case NIF: {
evaltree(psh, n->nif.test, EV_TESTED);
if (psh->evalskip)
goto out;
if (psh->exitstatus == 0)
evaltree(psh, n->nif.ifpart, flags);
else if (n->nif.elsepart)
evaltree(psh, n->nif.elsepart, flags);
else
psh->exitstatus = 0;
break;
}
case NWHILE:
case NUNTIL:
evalloop(psh, n, flags);
break;
case NFOR:
evalfor(psh, n, flags);
break;
case NCASE:
evalcase(psh, n, flags);
break;
case NDEFUN:
defun(psh, n->narg.text, n->narg.next);
psh->exitstatus = 0;
break;
case NNOT:
evaltree(psh, n->nnot.com, EV_TESTED);
psh->exitstatus = !psh->exitstatus;
break;
case NPIPE:
evalpipe(psh, n);
break;
case NCMD:
evalcommand(psh, n, flags, (struct backcmd *)NULL);
break;
default:
out1fmt(psh, "Node type = %d\n", n->type);
flushout(&psh->output);
break;
}
out:
if (psh->pendingsigs)
dotrap(psh);
if ((flags & EV_EXIT) != 0)
exitshell(psh, psh->exitstatus);
}
void
evaltree(union node *n, int flags)
{
bool do_etest;
do_etest = false;
if (n == NULL || nflag) {
TRACE(("evaltree(%s) called\n", n == NULL ? "NULL" : "-n"));
if (nflag == 0)
exitstatus = 0;
goto out;
}
#ifndef SMALL
displayhist = 1; /* show history substitutions done with fc */
#endif
#ifdef NODETYPENAME
TRACE(("pid %d, evaltree(%p: %s(%d), %#x) called\n",
getpid(), n, NODETYPENAME(n->type), n->type, flags));
#else
TRACE(("pid %d, evaltree(%p: %d, %#x) called\n",
getpid(), n, n->type, flags));
#endif
switch (n->type) {
case NSEMI:
evaltree(n->nbinary.ch1, flags & EV_TESTED);
if (nflag || evalskip)
goto out;
evaltree(n->nbinary.ch2, flags);
break;
case NAND:
evaltree(n->nbinary.ch1, EV_TESTED);
if (nflag || evalskip || exitstatus != 0)
goto out;
evaltree(n->nbinary.ch2, flags);
break;
case NOR:
evaltree(n->nbinary.ch1, EV_TESTED);
if (nflag || evalskip || exitstatus == 0)
goto out;
evaltree(n->nbinary.ch2, flags);
break;
case NREDIR:
expredir(n->nredir.redirect);
redirect(n->nredir.redirect, REDIR_PUSH | REDIR_KEEP);
evaltree(n->nredir.n, flags);
popredir();
break;
case NSUBSHELL:
evalsubshell(n, flags);
do_etest = !(flags & EV_TESTED);
break;
case NBACKGND:
evalsubshell(n, flags);
break;
case NIF: {
evaltree(n->nif.test, EV_TESTED);
if (nflag || evalskip)
goto out;
if (exitstatus == 0)
evaltree(n->nif.ifpart, flags);
else if (n->nif.elsepart)
evaltree(n->nif.elsepart, flags);
else
exitstatus = 0;
break;
}
case NWHILE:
case NUNTIL:
evalloop(n, flags);
break;
case NFOR:
evalfor(n, flags);
break;
case NCASE:
evalcase(n, flags);
break;
case NDEFUN:
defun(n->narg.text, n->narg.next);
exitstatus = 0;
break;
case NNOT:
evaltree(n->nnot.com, EV_TESTED);
exitstatus = !exitstatus;
break;
case NPIPE:
evalpipe(n);
do_etest = !(flags & EV_TESTED);
break;
case NCMD:
evalcommand(n, flags, NULL);
do_etest = !(flags & EV_TESTED);
break;
default:
#ifdef NODETYPENAME
out1fmt("Node type = %d(%s)\n", n->type, NODETYPENAME(n->type));
#else
out1fmt("Node type = %d\n", n->type);
#endif
flushout(&output);
break;
}
out:
if (pendingsigs)
dotrap();
if ((flags & EV_EXIT) != 0 || (eflag && exitstatus != 0 && do_etest))
exitshell(exitstatus);
}
