void
quitenv(struct shf *shf)
{
struct env *ep = e;
char *cp;
int fd;
yyrecursive_pop(true);
while (ep->oenv && ep->oenv->loc != ep->loc)
popblock();
if (ep->savefd != NULL) {
for (fd = 0; fd < NUFILE; fd++)
/* if ep->savefd[fd] < 0, means fd was closed */
if (ep->savefd[fd])
restfd(fd, ep->savefd[fd]);
if (ep->savefd[2])
/* Clear any write errors */
shf_reopen(2, SHF_WR, shl_out);
}
/*
* Bottom of the stack.
* Either main shell is exiting or cleanup_parents_env() was called.
*/
if (ep->oenv == NULL) {
#ifdef DEBUG_LEAKS
int i;
#endif
if (ep->type == E_NONE) {
/* Main shell exiting? */
#if HAVE_PERSISTENT_HISTORY
if (Flag(FTALKING))
hist_finish();
#endif
j_exit();
if (ep->flags & EF_FAKE_SIGDIE) {
int sig = (exstat & 0xFF) - 128;
/*
* ham up our death a bit (AT&T ksh
* only seems to do this for SIGTERM)
* Don't do it for SIGQUIT, since we'd
* dump a core..
*/
if ((sig == SIGINT || sig == SIGTERM) &&
(kshpgrp == kshpid)) {
setsig(&sigtraps[sig], SIG_DFL,
SS_RESTORE_CURR | SS_FORCE);
kill(0, sig);
}
}
}
if (shf)
shf_close(shf);
reclaim();
#ifdef DEBUG_LEAKS
#ifndef MKSH_NO_CMDLINE_EDITING
x_done();
#endif
#ifndef MKSH_NOPROSPECTOFWORK
/* block at least SIGCHLD during/after afreeall */
sigprocmask(SIG_BLOCK, &sm_sigchld, NULL);
#endif
afreeall(APERM);
for (fd = 3; fd < NUFILE; fd++)
if ((i = fcntl(fd, F_GETFD, 0)) != -1 &&
(i & FD_CLOEXEC))
close(fd);
close(2);
close(1);
close(0);
#endif
exit(exstat & 0xFF);
}
if (shf)
shf_close(shf);
reclaim();
e = e->oenv;
/* free the struct env - tricky due to the ALLOC_ITEM inside */
cp = (void *)ep;
afree(cp + sizeof(ALLOC_ITEM), ATEMP);
}
static int
comexec(struct op *t, struct tbl * volatile tp, const char **ap,
volatile int flags, volatile int *xerrok)
{
int i;
volatile int rv = 0;
const char *cp;
const char **lastp;
/* Must be static (XXX but why?) */
static struct op texec;
int type_flags;
bool keepasn_ok;
int fcflags = FC_BI|FC_FUNC|FC_PATH;
bool bourne_function_call = false;
struct block *l_expand, *l_assign;
/*
* snag the last argument for $_ XXX not the same as AT&T ksh,
* which only seems to set $_ after a newline (but not in
* functions/dot scripts, but in interactive and script) -
* perhaps save last arg here and set it in shell()?.
*/
if (Flag(FTALKING) && *(lastp = ap)) {
while (*++lastp)
;
/* setstr() can't fail here */
setstr(typeset("_", LOCAL, 0, INTEGER, 0), *--lastp,
KSH_RETURN_ERROR);
}
/**
* Deal with the shell builtins builtin, exec and command since
* they can be followed by other commands. This must be done before
* we know if we should create a local block which must be done
* before we can do a path search (in case the assignments change
* PATH).
* Odd cases:
* FOO=bar exec >/dev/null FOO is kept but not exported
* FOO=bar exec foobar FOO is exported
* FOO=bar command exec >/dev/null FOO is neither kept nor exported
* FOO=bar command FOO is neither kept nor exported
* PATH=... foobar use new PATH in foobar search
*/
keepasn_ok = true;
while (tp && tp->type == CSHELL) {
/* undo effects of command */
fcflags = FC_BI|FC_FUNC|FC_PATH;
if (tp->val.f == c_builtin) {
if ((cp = *++ap) == NULL ||
(!strcmp(cp, "--") && (cp = *++ap) == NULL)) {
tp = NULL;
break;
}
if ((tp = findcom(cp, FC_BI)) == NULL)
errorf("%s: %s: %s", Tbuiltin, cp, "not a builtin");
continue;
} else if (tp->val.f == c_exec) {
if (ap[1] == NULL)
break;
ap++;
flags |= XEXEC;
} else if (tp->val.f == c_command) {
int optc, saw_p = 0;
/*
* Ugly dealing with options in two places (here
* and in c_command(), but such is life)
*/
ksh_getopt_reset(&builtin_opt, 0);
while ((optc = ksh_getopt(ap, &builtin_opt, ":p")) == 'p')
saw_p = 1;
if (optc != EOF)
/* command -vV or something */
break;
/* don't look for functions */
fcflags = FC_BI|FC_PATH;
if (saw_p) {
if (Flag(FRESTRICTED)) {
warningf(true, "%s: %s",
"command -p", "restricted");
rv = 1;
goto Leave;
}
fcflags |= FC_DEFPATH;
}
ap += builtin_opt.optind;
/*
* POSIX says special builtins lose their status
* if accessed using command.
*/
keepasn_ok = false;
if (!ap[0]) {
/* ensure command with no args exits with 0 */
subst_exstat = 0;
break;
}
#ifndef MKSH_NO_EXTERNAL_CAT
} else if (tp->val.f == c_cat) {
/*
* if we have any flags, do not use the builtin
* in theory, we could allow -u, but that would
* mean to use ksh_getopt here and possibly ad-
* ded complexity and more code and isn't worth
* additional hassle (and the builtin must call
* ksh_getopt already but can't come back here)
*/
if (ap[1] && ap[1][0] == '-' && ap[1][1] != '\0' &&
/* argument, begins with -, is not - or -- */
(ap[1][1] != '-' || ap[1][2] != '\0'))
/* don't look for builtins or functions */
fcflags = FC_PATH;
else
/* go on, use the builtin */
break;
#endif
#if !defined(MKSH_SMALL)
} else if (tp->val.f == c_trap) {
t->u.evalflags &= ~DOTCOMEXEC;
break;
#endif
} else
break;
tp = findcom(ap[0], fcflags & (FC_BI|FC_FUNC));
}
#if !defined(MKSH_SMALL)
if (t->u.evalflags & DOTCOMEXEC)
flags |= XEXEC;
#endif
l_expand = e->loc;
if (keepasn_ok && (!ap[0] || (tp && (tp->flag & KEEPASN))))
type_flags = 0;
else {
/* create new variable/function block */
newblock();
/* ksh functions don't keep assignments, POSIX functions do. */
if (keepasn_ok && tp && tp->type == CFUNC &&
!(tp->flag & FKSH)) {
bourne_function_call = true;
type_flags = EXPORT;
} else
type_flags = LOCAL|LOCAL_COPY|EXPORT;
}
l_assign = e->loc;
if (Flag(FEXPORT))
type_flags |= EXPORT;
for (i = 0; t->vars[i]; i++) {
/* do NOT lookup in the new var/fn block just created */
e->loc = l_expand;
cp = evalstr(t->vars[i], DOASNTILDE);
e->loc = l_assign;
/* but assign in there as usual */
if (Flag(FXTRACE)) {
if (i == 0)
shf_puts(substitute(str_val(global("PS4")), 0),
shl_out);
shf_fprintf(shl_out, "%s%c", cp,
t->vars[i + 1] ? ' ' : '\n');
if (!t->vars[i + 1])
shf_flush(shl_out);
}
typeset(cp, type_flags, 0, 0, 0);
if (bourne_function_call && !(type_flags & EXPORT))
typeset(cp, LOCAL|LOCAL_COPY|EXPORT, 0, 0, 0);
}
if ((cp = *ap) == NULL) {
rv = subst_exstat;
goto Leave;
} else if (!tp) {
if (Flag(FRESTRICTED) && vstrchr(cp, '/')) {
warningf(true, "%s: %s", cp, "restricted");
rv = 1;
goto Leave;
}
tp = findcom(cp, fcflags);
}
switch (tp->type) {
/* shell built-in */
case CSHELL:
rv = call_builtin(tp, (const char **)ap, null);
if (!keepasn_ok && tp->val.f == c_shift) {
l_expand->argc = l_assign->argc;
l_expand->argv = l_assign->argv;
}
break;
/* function call */
case CFUNC: {
volatile unsigned char old_xflag;
volatile uint32_t old_inuse;
const char * volatile old_kshname;
if (!(tp->flag & ISSET)) {
struct tbl *ftp;
if (!tp->u.fpath) {
rv = (tp->u2.errnov == ENOENT) ? 127 : 126;
warningf(true, "%s: %s %s: %s", cp,
"can't find", "function definition file",
cstrerror(tp->u2.errnov));
break;
}
if (include(tp->u.fpath, 0, NULL, false) < 0) {
rv = errno;
warningf(true, "%s: %s %s %s: %s", cp,
"can't open", "function definition file",
tp->u.fpath, cstrerror(rv));
rv = 127;
break;
}
if (!(ftp = findfunc(cp, hash(cp), false)) ||
!(ftp->flag & ISSET)) {
warningf(true, "%s: %s %s", cp,
"function not defined by", tp->u.fpath);
rv = 127;
break;
}
tp = ftp;
}
/*
* ksh functions set $0 to function name, POSIX
* functions leave $0 unchanged.
*/
old_kshname = kshname;
if (tp->flag & FKSH)
kshname = ap[0];
else
ap[0] = kshname;
e->loc->argv = ap;
for (i = 0; *ap++ != NULL; i++)
;
e->loc->argc = i - 1;
/*
* ksh-style functions handle getopts sanely,
* Bourne/POSIX functions are insane...
*/
if (tp->flag & FKSH) {
e->loc->flags |= BF_DOGETOPTS;
e->loc->getopts_state = user_opt;
getopts_reset(1);
}
old_xflag = Flag(FXTRACE);
Flag(FXTRACE) |= tp->flag & TRACE ? 1 : 0;
old_inuse = tp->flag & FINUSE;
tp->flag |= FINUSE;
e->type = E_FUNC;
if (!(i = kshsetjmp(e->jbuf))) {
execute(tp->val.t, flags & XERROK, NULL);
i = LRETURN;
}
kshname = old_kshname;
Flag(FXTRACE) = old_xflag;
tp->flag = (tp->flag & ~FINUSE) | old_inuse;
/*
* Were we deleted while executing? If so, free the
* execution tree. TODO: Unfortunately, the table entry
* is never re-used until the lookup table is expanded.
*/
if ((tp->flag & (FDELETE|FINUSE)) == FDELETE) {
if (tp->flag & ALLOC) {
tp->flag &= ~ALLOC;
tfree(tp->val.t, tp->areap);
}
tp->flag = 0;
}
switch (i) {
case LRETURN:
case LERROR:
rv = exstat & 0xFF;
break;
case LINTR:
case LEXIT:
case LLEAVE:
case LSHELL:
quitenv(NULL);
unwind(i);
/* NOTREACHED */
default:
quitenv(NULL);
internal_errorf("%s %d", "CFUNC", i);
}
break;
}
/* executable command */
case CEXEC:
/* tracked alias */
case CTALIAS:
if (!(tp->flag&ISSET)) {
if (tp->u2.errnov == ENOENT) {
rv = 127;
warningf(true, "%s: %s", cp, "not found");
} else {
rv = 126;
warningf(true, "%s: %s: %s", cp, "can't execute",
cstrerror(tp->u2.errnov));
}
break;
}
/* set $_ to programme's full path */
/* setstr() can't fail here */
setstr(typeset("_", LOCAL|EXPORT, 0, INTEGER, 0),
tp->val.s, KSH_RETURN_ERROR);
if (flags&XEXEC) {
j_exit();
if (!(flags&XBGND)
#ifndef MKSH_UNEMPLOYED
|| Flag(FMONITOR)
#endif
) {
setexecsig(&sigtraps[SIGINT], SS_RESTORE_ORIG);
setexecsig(&sigtraps[SIGQUIT], SS_RESTORE_ORIG);
}
}
/* to fork we set up a TEXEC node and call execute */
texec.type = TEXEC;
/* for tprint */
texec.left = t;
texec.str = tp->val.s;
texec.args = ap;
rv = exchild(&texec, flags, xerrok, -1);
break;
}
Leave:
if (flags & XEXEC) {
exstat = rv & 0xFF;
unwind(LLEAVE);
}
return (rv);
}
static int
comexec(struct op *t, struct tbl * volatile tp, const char **ap,
volatile int flags, volatile int *xerrok)
{
int i;
volatile int rv = 0;
const char *cp;
const char **lastp;
/* Must be static (XXX but why?) */
static struct op texec;
int type_flags;
bool resetspec;
int fcflags = FC_BI|FC_FUNC|FC_PATH;
struct block *l_expand, *l_assign;
int optc;
const char *exec_argv0 = NULL;
bool exec_clrenv = false;
/* snag the last argument for $_ */
if (Flag(FTALKING) && *(lastp = ap)) {
/*
* XXX not the same as AT&T ksh, which only seems to set $_
* after a newline (but not in functions/dot scripts, but in
* interactive and script) - perhaps save last arg here and
* set it in shell()?.
*/
while (*++lastp)
;
/* setstr() can't fail here */
setstr(typeset("_", LOCAL, 0, INTEGER, 0), *--lastp,
KSH_RETURN_ERROR);
}
/**
* Deal with the shell builtins builtin, exec and command since
* they can be followed by other commands. This must be done before
* we know if we should create a local block which must be done
* before we can do a path search (in case the assignments change
* PATH).
* Odd cases:
* FOO=bar exec >/dev/null FOO is kept but not exported
* FOO=bar exec foobar FOO is exported
* FOO=bar command exec >/dev/null FOO is neither kept nor exported
* FOO=bar command FOO is neither kept nor exported
* PATH=... foobar use new PATH in foobar search
*/
resetspec = false;
while (tp && tp->type == CSHELL) {
/* undo effects of command */
fcflags = FC_BI|FC_FUNC|FC_PATH;
if (tp->val.f == c_builtin) {
if ((cp = *++ap) == NULL ||
(!strcmp(cp, "--") && (cp = *++ap) == NULL)) {
tp = NULL;
break;
}
if ((tp = findcom(cp, FC_BI)) == NULL)
errorf("%s: %s: %s", Tbuiltin, cp, "not a builtin");
if (tp->type == CSHELL && (tp->val.f == c_cat
#ifdef MKSH_PRINTF_BUILTIN
|| tp->val.f == c_printf
#endif
))
break;
continue;
} else if (tp->val.f == c_exec) {
if (ap[1] == NULL)
break;
ksh_getopt_reset(&builtin_opt, GF_ERROR);
while ((optc = ksh_getopt(ap, &builtin_opt, "a:c")) != -1)
switch (optc) {
case 'a':
exec_argv0 = builtin_opt.optarg;
break;
case 'c':
exec_clrenv = true;
/* ensure we can actually do this */
resetspec = true;
break;
default:
rv = 2;
goto Leave;
}
ap += builtin_opt.optind;
flags |= XEXEC;
} else if (tp->val.f == c_command) {
bool saw_p = false;
/*
* Ugly dealing with options in two places (here
* and in c_command(), but such is life)
*/
ksh_getopt_reset(&builtin_opt, 0);
while ((optc = ksh_getopt(ap, &builtin_opt, ":p")) == 'p')
saw_p = true;
if (optc != -1)
/* command -vV or something */
break;
/* don't look for functions */
fcflags = FC_BI|FC_PATH;
if (saw_p) {
if (Flag(FRESTRICTED)) {
warningf(true, "%s: %s",
"command -p", "restricted");
rv = 1;
goto Leave;
}
fcflags |= FC_DEFPATH;
}
ap += builtin_opt.optind;
/*
* POSIX says special builtins lose their status
* if accessed using command.
*/
resetspec = true;
if (!ap[0]) {
/* ensure command with no args exits with 0 */
subst_exstat = 0;
break;
}
} else if (tp->val.f == c_cat) {
/* if we have any flags, do not use the builtin */
if (ap[1] && ap[1][0] == '-' && ap[1][1] != '\0' &&
/* argument, begins with -, is not - or -- */
(ap[1][1] != '-' || ap[1][2] != '\0')) {
struct tbl *ext_cat;
ext_cat = findcom(Tcat, FC_PATH | FC_FUNC);
if (ext_cat && (ext_cat->type != CTALIAS ||
(ext_cat->flag & ISSET)))
tp = ext_cat;
}
break;
#ifdef MKSH_PRINTF_BUILTIN
} else if (tp->val.f == c_printf) {
struct tbl *ext_printf;
ext_printf = findcom(Tprintf, FC_PATH | FC_FUNC);
if (ext_printf && (ext_printf->type != CTALIAS ||
(ext_printf->flag & ISSET)))
tp = ext_printf;
break;
#endif
} else if (tp->val.f == c_trap) {
t->u.evalflags &= ~DOTCOMEXEC;
break;
} else
break;
tp = findcom(ap[0], fcflags & (FC_BI|FC_FUNC));
}
if (t->u.evalflags & DOTCOMEXEC)
flags |= XEXEC;
l_expand = e->loc;
if (!resetspec && (!ap[0] || (tp && (tp->flag & KEEPASN))))
type_flags = 0;
else {
/* create new variable/function block */
newblock();
/* ksh functions don't keep assignments, POSIX functions do. */
if (!resetspec && tp && tp->type == CFUNC &&
!(tp->flag & FKSH))
type_flags = EXPORT;
else
type_flags = LOCAL|LOCAL_COPY|EXPORT;
}
l_assign = e->loc;
if (exec_clrenv)
l_assign->flags |= BF_STOPENV;
if (Flag(FEXPORT))
type_flags |= EXPORT;
if (Flag(FXTRACE))
change_xtrace(2, false);
for (i = 0; t->vars[i]; i++) {
/* do NOT lookup in the new var/fn block just created */
e->loc = l_expand;
cp = evalstr(t->vars[i], DOASNTILDE | DOSCALAR);
e->loc = l_assign;
if (Flag(FXTRACE)) {
const char *ccp;
ccp = skip_varname(cp, true);
if (*ccp == '+')
++ccp;
if (*ccp == '=')
++ccp;
shf_write(cp, ccp - cp, shl_xtrace);
print_value_quoted(shl_xtrace, ccp);
shf_putc(' ', shl_xtrace);
}
/* but assign in there as usual */
typeset(cp, type_flags, 0, 0, 0);
}
if (Flag(FXTRACE)) {
change_xtrace(2, false);
if (ap[rv = 0]) {
xtrace_ap_loop:
print_value_quoted(shl_xtrace, ap[rv]);
if (ap[++rv]) {
shf_putc(' ', shl_xtrace);
goto xtrace_ap_loop;
}
}
change_xtrace(1, false);
}
if ((cp = *ap) == NULL) {
rv = subst_exstat;
goto Leave;
} else if (!tp) {
if (Flag(FRESTRICTED) && vstrchr(cp, '/')) {
warningf(true, "%s: %s", cp, "restricted");
rv = 1;
goto Leave;
}
tp = findcom(cp, fcflags);
}
switch (tp->type) {
/* shell built-in */
case CSHELL:
do_call_builtin:
rv = call_builtin(tp, (const char **)ap, null, resetspec);
if (resetspec && tp->val.f == c_shift) {
l_expand->argc = l_assign->argc;
l_expand->argv = l_assign->argv;
}
break;
/* function call */
case CFUNC: {
volatile uint32_t old_inuse;
const char * volatile old_kshname;
volatile uint8_t old_flags[FNFLAGS];
if (!(tp->flag & ISSET)) {
struct tbl *ftp;
if (!tp->u.fpath) {
rv = (tp->u2.errnov == ENOENT) ? 127 : 126;
warningf(true, "%s: %s %s: %s", cp,
"can't find", "function definition file",
cstrerror(tp->u2.errnov));
break;
}
if (include(tp->u.fpath, 0, NULL, false) < 0) {
if (!strcmp(cp, Tcat)) {
no_cat_in_FPATH:
tp = findcom(Tcat, FC_BI);
goto do_call_builtin;
}
#ifdef MKSH_PRINTF_BUILTIN
if (!strcmp(cp, Tprintf)) {
no_printf_in_FPATH:
tp = findcom(Tprintf, FC_BI);
goto do_call_builtin;
}
#endif
warningf(true, "%s: %s %s %s: %s", cp,
"can't open", "function definition file",
tp->u.fpath, cstrerror(errno));
rv = 127;
break;
}
if (!(ftp = findfunc(cp, hash(cp), false)) ||
!(ftp->flag & ISSET)) {
if (!strcmp(cp, Tcat))
goto no_cat_in_FPATH;
#ifdef MKSH_PRINTF_BUILTIN
if (!strcmp(cp, Tprintf))
goto no_printf_in_FPATH;
#endif
warningf(true, "%s: %s %s", cp,
"function not defined by", tp->u.fpath);
rv = 127;
break;
}
tp = ftp;
}
/*
* ksh functions set $0 to function name, POSIX
* functions leave $0 unchanged.
*/
old_kshname = kshname;
if (tp->flag & FKSH)
kshname = ap[0];
else
ap[0] = kshname;
e->loc->argv = ap;
for (i = 0; *ap++ != NULL; i++)
;
e->loc->argc = i - 1;
/*
* ksh-style functions handle getopts sanely,
* Bourne/POSIX functions are insane...
*/
if (tp->flag & FKSH) {
e->loc->flags |= BF_DOGETOPTS;
e->loc->getopts_state = user_opt;
getopts_reset(1);
}
for (type_flags = 0; type_flags < FNFLAGS; ++type_flags)
old_flags[type_flags] = shell_flags[type_flags];
change_xtrace((Flag(FXTRACEREC) ? Flag(FXTRACE) : 0) |
((tp->flag & TRACE) ? 1 : 0), false);
old_inuse = tp->flag & FINUSE;
tp->flag |= FINUSE;
e->type = E_FUNC;
if (!(i = kshsetjmp(e->jbuf))) {
execute(tp->val.t, flags & XERROK, NULL);
i = LRETURN;
}
kshname = old_kshname;
change_xtrace(old_flags[(int)FXTRACE], false);
#ifndef MKSH_LEGACY_MODE
if (tp->flag & FKSH) {
/* Korn style functions restore Flags on return */
old_flags[(int)FXTRACE] = Flag(FXTRACE);
for (type_flags = 0; type_flags < FNFLAGS; ++type_flags)
shell_flags[type_flags] = old_flags[type_flags];
}
#endif
tp->flag = (tp->flag & ~FINUSE) | old_inuse;
/*
* Were we deleted while executing? If so, free the
* execution tree.
*/
if ((tp->flag & (FDELETE|FINUSE)) == FDELETE) {
if (tp->flag & ALLOC) {
tp->flag &= ~ALLOC;
tfree(tp->val.t, tp->areap);
}
tp->flag = 0;
}
switch (i) {
case LRETURN:
case LERROR:
rv = exstat & 0xFF;
break;
case LINTR:
case LEXIT:
case LLEAVE:
case LSHELL:
quitenv(NULL);
unwind(i);
/* NOTREACHED */
default:
quitenv(NULL);
internal_errorf("%s %d", "CFUNC", i);
}
break;
}
/* executable command */
case CEXEC:
/* tracked alias */
case CTALIAS:
if (!(tp->flag&ISSET)) {
if (tp->u2.errnov == ENOENT) {
rv = 127;
warningf(true, "%s: %s", cp, "not found");
} else {
rv = 126;
warningf(true, "%s: %s: %s", cp, "can't execute",
cstrerror(tp->u2.errnov));
}
break;
}
/* set $_ to program's full path */
/* setstr() can't fail here */
setstr(typeset("_", LOCAL | EXPORT, 0, INTEGER, 0),
tp->val.s, KSH_RETURN_ERROR);
/* to fork, we set up a TEXEC node and call execute */
texec.type = TEXEC;
/* for vistree/dumptree */
texec.left = t;
texec.str = tp->val.s;
texec.args = ap;
/* in this case we do not fork, of course */
if (flags & XEXEC) {
if (exec_argv0)
texec.args[0] = exec_argv0;
j_exit();
if (!(flags & XBGND)
#ifndef MKSH_UNEMPLOYED
|| Flag(FMONITOR)
#endif
) {
setexecsig(&sigtraps[SIGINT], SS_RESTORE_ORIG);
setexecsig(&sigtraps[SIGQUIT], SS_RESTORE_ORIG);
}
}
rv = exchild(&texec, flags, xerrok, -1);
break;
}
Leave:
if (flags & XEXEC) {
exstat = rv & 0xFF;
unwind(LLEAVE);
}
return (rv);
}