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main.c
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/* $OpenBSD: main.c,v 1.57 2015/09/10 22:48:58 nicm Exp $ */
/* $OpenBSD: tty.c,v 1.10 2014/08/10 02:44:26 guenther Exp $ */
/* $OpenBSD: io.c,v 1.26 2015/09/11 08:00:27 guenther Exp $ */
/* $OpenBSD: table.c,v 1.16 2015/09/01 13:12:31 tedu Exp $ */
/*-
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
* 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018,
* 2019, 2020, 2021, 2022, 2023, 2025
* mirabilos <m$(date +%Y)@mirbsd.de>
*
* Provided that these terms and disclaimer and all copyright notices
* are retained or reproduced in an accompanying document, permission
* is granted to deal in this work without restriction, including un-
* limited rights to use, publicly perform, distribute, sell, modify,
* merge, give away, or sublicence.
*
* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
* the utmost extent permitted by applicable law, neither express nor
* implied; without malicious intent or gross negligence. In no event
* may a licensor, author or contributor be held liable for indirect,
* direct, other damage, loss, or other issues arising in any way out
* of dealing in the work, even if advised of the possibility of such
* damage or existence of a defect, except proven that it results out
* of said person's immediate fault when using the work as intended.
*/
#define EXTERN
#include "sh.h"
__RCSID("$MirOS: src/bin/mksh/main.c,v 1.441 2025/04/26 22:35:20 tg Exp $");
__IDSTRING(mbsdcc_h_rcsid, SYSKERN_MBSDCC_H);
__IDSTRING(mbsdint_h_rcsid, SYSKERN_MBSDINT_H);
__IDSTRING(sh_h_rcsid, MKSH_SH_H_ID);
#ifndef MKSHRC_PATH
#define MKSHRC_PATH "~/.mkshrc"
#endif
#ifndef MKSH_DEFAULT_TMPDIR
#define MKSH_DEFAULT_TMPDIR MKSH_UNIXROOT "/tmp"
#endif
#if !HAVE_POSIX_UTF8_LOCALE
/* this is the “implementation-defined default locale” */
#ifdef MKSH_DEFAULT_UTFLOC
#define MKSH_DEFAULT_LOCALE "UTF-8"
#else
#define MKSH_DEFAULT_LOCALE "C"
#endif
#endif
static void main_init(int, const char *[], Source **);
void chvt_reinit(void);
static void reclaim(void);
static void remove_temps(struct temp *);
static void rndsetup(void);
static void init_environ(void);
#ifdef SIGWINCH
static void x_sigwinch(int);
#endif
#ifdef DEBUG
static void reclim_trace(void);
#else
#define reclim_trace() /* nothing */
#endif
static const char initsubs[] =
"${PS2=> }"
"${PS3=#? }"
"${PS4=+ }"
"${SECONDS=0}"
"${TMOUT=0}"
"${EPOCHREALTIME=}";
static const char *initcoms[] = {
Ttypeset, Tdr, initvsn, NULL,
Ttypeset, Tdx, "HOME", TPATH, TSHELL, NULL,
Ttypeset, "-i10", "COLUMNS", "LINES", "SECONDS", "TMOUT", NULL,
Talias,
"integer=\\\\builtin typeset -i",
"local=\\\\builtin typeset",
/* not "alias -t --": hash -r needs to work */
"hash=\\\\builtin alias -t",
"type=\\\\builtin whence -v",
"autoload=\\\\builtin typeset -fu",
"functions=\\\\builtin typeset -f",
"history=\\\\builtin fc -l",
"nameref=\\\\builtin typeset -n",
"nohup=nohup ",
"r=\\\\builtin fc -e -",
"login=\\\\builtin exec login",
NULL,
/* this is what AT&T ksh seems to track, with the addition of emacs */
Talias, "-tU",
"cat", "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls",
"make", "mv", "pr", "rm", "sed", Tsh, "vi", "who", NULL,
NULL
};
static const char *restr_com[] = {
Ttypeset, Tdr, TENV, "HISTFILE", TPATH, TSHELL, NULL
};
extern const char Tpipest[];
/* top-level parsing and execution environment */
static struct env env;
struct env *e = &env;
/* buffer */
#if !HAVE_GET_CURRENT_DIR_NAME
static size_t getwd_bufsz = 448U;
#endif
static char *getwd_bufp = NULL;
/* many compile-time assertions */
mbCTA_BEG(main_c);
/* require char to be 8 bit long */
mbCTA(char_8bit, (CHAR_BIT) == 8 &&
(((unsigned int)(unsigned char)255U) == 255U) &&
(((unsigned int)(unsigned char)256U) == 0U) &&
mbiTYPE_UBITS(unsigned char) == 8U &&
mbiMASK_BITS(SCHAR_MAX) == 7U);
/* the next assertion is probably not really needed */
mbCTA(short_is_2_char, sizeof(short) == 2);
/* the next assertion is probably not really needed */
mbCTA(int_is_4_char, sizeof(int) == 4);
#ifndef MKSH_LEGACY_MODE
mbiCTA_TYPE_MBIT(sari, mksh_ari_t);
mbiCTA_TYPE_MBIT(uari, mksh_uari_t);
mbCTA(basic_int32_smask, mbiMASK_CHK(INT32_MAX));
mbCTA(basic_int32_umask, mbiMASK_CHK(UINT32_MAX));
mbCTA(basic_int32_ari,
mbiTYPE_UMAX(mksh_uari_t) == (UINT32_MAX) &&
/* require two’s complement */
((INT32_MIN)+1 == -(INT32_MAX)));
/* the next assertion is probably not really needed */
mbCTA(ari_is_4_char, sizeof(mksh_ari_t) == 4);
/* but this is */
mbCTA(ari_has_31_bit, mbiMASK_BITS(INT32_MAX) == 31);
/* the next assertion is probably not really needed */
mbCTA(uari_is_4_char, sizeof(mksh_uari_t) == 4);
mbCTA(uari_is_32_bit, mbiTYPE_UBITS(mksh_uari_t) == 32);
#else
mbCTA(long_complement, (LONG_MIN)+1 == -(LONG_MAX));
#endif
/* these are always required */
mbCTA(ari_is_signed, !mbiTYPE_ISU(mksh_ari_t));
mbCTA(uari_is_unsigned, mbiTYPE_ISU(mksh_uari_t));
/* we require these to have the precisely same size and assume 2s complement */
mbCTA(ari_size_no_matter_of_signedness,
sizeof(mksh_ari_t) == sizeof(mksh_uari_t));
/* our formatting routines assume this */
mbCTA(ari_fits_in_long, sizeof(mksh_ari_t) <= sizeof(long));
mbCTA_END(main_c);
/* end of compile-time asserts */
static void
rndsetup(void)
{
struct {
ALLOC_ITEM alloc_INT;
void *bssptr, *dataptr, *stkptr, *mallocptr;
kshjmp_buf jbuf;
struct timeval tv;
} *bufptr;
char *cp;
cp = alloc(sizeof(*bufptr) - sizeof(ALLOC_ITEM), APERM);
/* clear the allocated space, for valgrind and to avoid UB */
memset(cp, 0, sizeof(*bufptr) - sizeof(ALLOC_ITEM));
/* undo what alloc() did to the malloc result address */
bufptr = (void *)(cp - sizeof(ALLOC_ITEM));
/* PIE or something similar provides us with deltas here */
bufptr->bssptr = &rndsetupstate;
bufptr->dataptr = &e;
/* ASLR in at least Windows, Linux, some BSDs */
bufptr->stkptr = &bufptr;
/* randomised malloc in BSD (and possibly others) */
bufptr->mallocptr = bufptr;
/* glibc pointer guard */
#ifdef MKSH_NO_SIGSETJMP
setjmp(bufptr->jbuf);
#else
sigsetjmp(bufptr->jbuf, 1);
#endif
/* introduce variation (cannot use gettimeofday *tzp portably) */
mksh_TIME(bufptr->tv);
#ifdef MKSH_ALLOC_CATCH_UNDERRUNS
mprotect(((char *)bufptr) + 4096, 4096, PROT_READ | PROT_WRITE);
#endif
chvt_rndsetup(bufptr, sizeof(*bufptr));
afree(cp, APERM);
}
/* pre-initio() */
void
chvt_reinit(void)
{
kshpid = procpid = getpid();
ksheuid = geteuid();
kshpgrp = getpgrp();
kshppid = getppid();
}
static const char *empty_argv[] = {
Tmksh, NULL
};
#ifndef MKSH_EARLY_LOCALE_TRACKING
static kby
isuc(const char *cx) {
const char *cp;
if (!cx || !*cx)
return (0);
if ((cp = cstrchr(cx, '.')))
++cp;
else
cp = cx;
if (!isCh(cp[0], 'U', 'u') ||
!isCh(cp[1], 'T', 't') ||
!isCh(cp[2], 'F', 'f'))
return (0);
cp += isch(cp[3], '-') ? 4 : 3;
return (isch(*cp, '8') && (isch(cp[1], '@') || !cp[1]));
}
#endif
kby
kshname_islogin(const char **kshbasenamep)
{
const char *cp;
size_t o;
kby rv;
/* determine the basename (without '-' or path) of the executable */
cp = kshname;
o = 0;
while ((rv = cp[o++])) {
if (mksh_cdirsep(rv)) {
cp += o;
o = 0;
}
}
rv = isch(*cp, '-') || isch(*kshname, '-');
if (isch(*cp, '-'))
++cp;
if (!*cp)
cp = empty_argv[0];
*kshbasenamep = cp;
return (rv);
}
/* pre-initio() */
static void
main_init(int argc, const char *argv[], Source **sp)
{
int argi = 1, i;
Source *s = NULL;
unsigned char restricted_shell = 0, errexit, utf_flag;
char *cp;
const char *ccp, **wp;
struct tbl *vp;
struct stat s_stdin;
#if !defined(_PATH_DEFPATH) && defined(_CS_PATH)
ssize_t k;
#endif
#if defined(MKSH_EBCDIC) || defined(MKSH_FAUX_EBCDIC)
/* this must come *really* early due to locale use */
ebcdic_init();
#endif
set_ifs(TC_IFSWS);
#ifdef __OS2__
os2_init(&argc, &argv);
#define builtin_name_cmp stricmp
#else
#define builtin_name_cmp strcmp
#endif
/* do things like getpgrp() et al. */
chvt_reinit();
/* make sure argv[] is sane, for weird OSes */
if (!*argv) {
argv = empty_argv;
argc = 1;
}
kshname = argv[0];
/* initialise permanent Area */
ainit(&aperm);
/* max. name length: -2147483648 = 11 (+ NUL) */
vtemp = alloc(mbccFAMSZ(struct tbl, name, 12), APERM);
#if !HAVE_GET_CURRENT_DIR_NAME
getwd_bufp = alloc(getwd_bufsz + 1U, APERM);
getwd_bufp[getwd_bufsz] = '\0';
#endif
/* set up base environment */
env.type = E_NONE;
ainit(&env.area);
/* set up global l->vars and l->funs */
newblock();
/* Do this first so output routines (eg. kwarnf, shellf) can work */
initio();
/* check kshname: leading dash, determine basename */
Flag(FLOGIN) = kshname_islogin(&ccp);
/*
* Turn on nohup by default. (AT&T ksh does not have a nohup
* option - it always sends the hup).
*/
Flag(FNOHUP) = 1;
/*
* Turn on brace expansion by default. AT&T kshs that have
* alternation always have it on.
*/
Flag(FBRACEEXPAND) = 1;
/*
* Turn on "set -x" inheritance by default.
*/
Flag(FXTRACEREC) = 1;
/* define built-in commands and see if we were called as one */
ktinit(APERM, &builtins,
/* currently up to 50 builtins: 75% of 128 = 2^7 */
7);
for (i = 0; mkshbuiltins[i].name != NULL; ++i) {
const char *builtin_name;
builtin_name = builtin(mkshbuiltins[i].name,
mkshbuiltins[i].func);
if (!builtin_name_cmp(ccp, builtin_name)) {
/* canonicalise argv[0] */
ccp = builtin_name;
as_builtin = Ja;
}
}
if (!as_builtin) {
/* check for -T option early */
argi = parse_args(argv, OF_FIRSTTIME, NULL);
if (argi < 0)
unwind(LERROR);
/* called as rsh, rmksh, -rsh, RKSH.EXE, etc.? */
if (isCh(*ccp, 'R', 'r')) {
++ccp;
++restricted_shell;
}
#if defined(MKSH_BINSHPOSIX) || defined(MKSH_BINSHREDUCED)
/* are we called as -rsh or /bin/sh or SH.EXE or so? */
if (isCh(ccp[0], 'S', 's') &&
isCh(ccp[1], 'H', 'h')) {
/* either also turns off braceexpand */
#ifdef MKSH_BINSHPOSIX
/* enable better POSIX conformance */
change_flag(FPOSIX, OF_FIRSTTIME, Ja);
#endif
#ifdef MKSH_BINSHREDUCED
/* enable kludge/compat mode */
change_flag(FSH, OF_FIRSTTIME, Ja);
#endif
}
#endif
}
initvar();
inittraps();
coproc_init();
/* set up variable and command dictionaries */
ktinit(APERM, &taliases, 0);
ktinit(APERM, &aliases, 0);
#ifndef MKSH_NOPWNAM
ktinit(APERM, &homedirs, 0);
#endif
/* define shell keywords */
initkeywords();
init_histvec();
/* initialise tty size before importing environment */
change_winsz();
#ifdef _PATH_DEFPATH
def_path = _PATH_DEFPATH;
#else
#ifdef _CS_PATH
if ((k = confstr(_CS_PATH, NULL, 0)) > 0 &&
confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1)
def_path = cp;
else
#endif
/*
* this is uniform across all OSes unless it
* breaks somewhere hard; don't try to optimise,
* e.g. add stuff for Interix or remove /usr
* for HURD, because e.g. Debian GNU/HURD is
* "keeping a regular /usr"; this is supposed
* to be a sane 'basic' default PATH
*/
def_path = MKSH_UNIXROOT "/bin" MKSH_PATHSEPS
MKSH_UNIXROOT "/usr/bin" MKSH_PATHSEPS
MKSH_UNIXROOT "/sbin" MKSH_PATHSEPS
MKSH_UNIXROOT "/usr/sbin";
#endif
/*
* Set PATH to def_path (will set the path global variable).
* Import of environment below will probably change this setting;
* the EXPORT flag is only added via initcoms for this to work.
*/
vp = global(TPATH);
/* setstr can't fail here */
setstr(vp, def_path, KSH_RETURN_ERROR);
#ifndef MKSH_NO_CMDLINE_EDITING
/*
* Set edit mode to emacs by default, may be overridden
* by the environment or the user. Also, we want tab completion
* on in vi by default.
*/
change_flag(FEMACS, OF_INTERNAL, Ja);
#if !MKSH_S_NOVI
Flag(FVITABCOMPLETE) = 1;
#endif
#endif
/* import environment */
init_environ();
/* for security */
typeset(TinitIFS, 0, 0, 0, 0);
/* assign default shell variable values */
typeset("PATHSEP=" MKSH_PATHSEPS, 0, 0, 0, 0);
substitute(initsubs, 0);
/* Figure out the current working directory and set $PWD */
vp = global(TPWD);
cp = str_val(vp);
/* Try to use existing $PWD if it is valid */
set_current_wd((mksh_abspath(cp) && test_eval(NULL, TO_FILEQ, cp,
Tdot, Ja)) ? cp : NULL);
if (current_wd[0])
simplify_path(current_wd);
/* Only set pwd if we know where we are or if it had a bogus value */
if (current_wd[0] || *cp)
/* setstr can't fail here */
setstr(vp, current_wd, KSH_RETURN_ERROR);
for (wp = initcoms; *wp != NULL; wp++) {
c_builtin(wp);
while (*wp != NULL)
wp++;
}
setint_n(global("OPTIND"), 1, 10);
kshuid = getuid();
kshgid = getgid();
kshegid = getegid();
rndsetup();
safe_prompt = ksheuid ? "$ " : "# ";
vp = global("PS1");
/* Set PS1 if unset or we are root and prompt doesn't contain a # */
if (!(vp->flag & ISSET) ||
(!ksheuid && !vstrchr(str_val(vp), '#')))
/* setstr can't fail here */
setstr(vp, safe_prompt, KSH_RETURN_ERROR);
/* ensure several variables will be (unsigned) integers */
setint_n((vp = global("BASHPID")), 0, 10);
vp->flag |= INT_U;
setint_n((vp = global("PGRP")), (mksh_uari_t)kshpgrp, 10);
vp->flag |= INT_U;
setint_n((vp = global("PPID")), (mksh_uari_t)kshppid, 10);
vp->flag |= INT_U;
setint_n((vp = global("USER_ID")), (mksh_uari_t)ksheuid, 10);
vp->flag |= INT_U;
setint_n((vp = global("KSHUID")), (mksh_uari_t)kshuid, 10);
vp->flag |= INT_U;
setint_n((vp = global("KSHEGID")), (mksh_uari_t)kshegid, 10);
vp->flag |= INT_U;
setint_n((vp = global("KSHGID")), (mksh_uari_t)kshgid, 10);
vp->flag |= INT_U;
/* this is needed globally */
setint_n((vp_pipest = global(Tpipest)), 0, 10);
/* unsigned integer, but avoid rndset call: done farther below */
vp = global("RANDOM");
vp->flag &= ~SPECIAL;
setint_n(vp, 0, 10);
vp->flag |= SPECIAL | INT_U;
/* Set this before parsing arguments */
Flag(FPRIVILEGED) = (kshuid != ksheuid || kshgid != kshegid) ? 2 : 0;
/* record if monitor is set on command line (see j_init() in jobs.c) */
#ifndef MKSH_UNEMPLOYED
Flag(FMONITOR) = 127;
#endif
/* this to note if utf-8 mode is set on command line (see below) */
/*XXX this and the below can probably go away */
/*XXX UTFMODE should be set from env here if locale tracking, just keep it */
UTFMODE = 2;
if (!as_builtin) {
argi = parse_args(argv, OF_CMDLINE, NULL);
if (argi < 0)
unwind(LERROR);
}
/*XXX drop this and the entire cases below */
/* process this later only, default to off (hysterical raisins) */
utf_flag = UTFMODE;
UTFMODE = 0;
if (as_builtin) {
/* auto-detect from environment variables, always */
utf_flag = 3;
} else if (Flag(FCOMMAND)) {
s = pushs(SSTRINGCMDLINE, ATEMP);
if (!(s->start = s->str = argv[argi++]))
kerrf(KWF_ERR(1) | KWF_PREFIX | KWF_FILELINE |
KWF_TWOMSG | KWF_NOERRNO, Tdc, Treq_arg);
while (*s->str) {
if (ctype(*s->str, C_QUOTE))
break;
s->str++;
}
if (!*s->str)
s->flags |= SF_MAYEXEC;
s->str = s->start;
#ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT
/* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */
if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--"))
++argi;
#endif
if (argv[argi])
kshname = argv[argi++];
} else if (argi < argc && !Flag(FSTDIN)) {
s = pushs(SFILE, ATEMP);
#ifdef __OS2__
/*
* A bug in OS/2 extproc (like shebang) handling makes
* it not pass the full pathname of a script, so we need
* to search for it. This changes the behaviour of a
* simple "mksh foo", but can't be helped.
*/
s->file = argv[argi++];
if (search_access(s->file, X_OK) != 0)
s->file = search_path(s->file, path, X_OK, NULL);
if (!s->file || !*s->file)
s->file = argv[argi - 1];
#else
s->file = argv[argi++];
#endif
s->u.shf = shf_open(s->file, O_RDONLY | O_MAYEXEC, 0,
SHF_MAPHI | SHF_CLEXEC);
if (s->u.shf == NULL) {
shl_stdout_ok = Nee;
kwarnf(KWF_ERR(127) |
KWF_PREFIX | KWF_FILELINE | KWF_ONEMSG, s->file);
unwind(LERROR);
}
kshname = s->file;
} else {
Flag(FSTDIN) = 1;
s = pushs(SSTDIN, ATEMP);
s->file = "<stdin>";
s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0),
NULL);
if (isatty(0) && isatty(2)) {
Flag(FTALKING) = Flag(FTALKING_I) = 1;
/* The following only if isatty(0) */
s->flags |= SF_TTY;
s->u.shf->flags |= SHF_INTERRUPT;
s->file = NULL;
}
}
/* this bizarreness is mandated by POSIX */
if (Flag(FTALKING) && fstat(0, &s_stdin) >= 0 &&
(S_ISCHR(s_stdin.st_mode) || S_ISFIFO(s_stdin.st_mode)))
reset_nonblock(0);
/* initialise job control */
j_init();
/* do this after j_init() which calls tty_init_state() */
if (Flag(FTALKING)) {
if (utf_flag == 2) {
#ifndef MKSH_ASSUME_UTF8
/* auto-detect from locale or environment */
utf_flag = 4;
#else /* this may not be an #elif */
#if MKSH_ASSUME_UTF8
utf_flag = 1;
#else
/* always disable UTF-8 (for interactive) */
utf_flag = 0;
#endif
#endif
}
#ifndef MKSH_NO_CMDLINE_EDITING
x_init();
#endif
}
#ifdef SIGWINCH
sigtraps[SIGWINCH].flags |= TF_SHELL_USES;
setsig(&sigtraps[SIGWINCH], x_sigwinch,
SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP);
#endif
/*
* allocate a new array because otherwise, when we modify
* it in-place, ps(1) output changes; the meaning of argc
* here is slightly different as it excludes kshname, and
* we add a trailing NULL sentinel as well
*/
e->loc->argc = argc - argi;
e->loc->argv = alloc2(e->loc->argc + 2, sizeof(char *), APERM);
memcpy(&e->loc->argv[1], &argv[argi], e->loc->argc * sizeof(char *));
e->loc->argv[e->loc->argc + 1] = NULL;
if (as_builtin)
e->loc->argv[0] = ccp;
else {
e->loc->argv[0] = kshname;
getopts_reset(1);
}
/*XXX to go away entirely with locale tracking */
/* divine the initial state of the utf8-mode Flag */
ccp = null;
switch (utf_flag) {
#ifdef MKSH_EARLY_LOCALE_TRACKING
/* not set on command line, not FTALKING */
case 2:
#endif
/* auto-detect from locale or environment */
case 4:
#ifndef MKSH_EARLY_LOCALE_TRACKING
#if HAVE_POSIX_UTF8_LOCALE
ccp = setlocale(LC_CTYPE, "");
if (!isuc(ccp))
ccp = nl_langinfo(CODESET);
if (!isuc(ccp))
ccp = null;
#endif
#endif
/* FALLTHROUGH */
/* auto-detect from environment */
case 3:
#ifndef MKSH_EARLY_LOCALE_TRACKING
/* these were imported from environ earlier */
if (ccp == null)
ccp = str_val(global("LC_ALL"));
if (ccp == null)
ccp = str_val(global("LC_CTYPE"));
if (ccp == null)
ccp = str_val(global("LANG"));
UTFMODE = isuc(ccp);
#else
recheck_ctype(); /*XXX probably unnecessary here */
#endif
break;
#ifndef MKSH_EARLY_LOCALE_TRACKING
/* not set on command line, not FTALKING */
case 2:
#endif
/* unknown values */
default:
utf_flag = 0;
/* FALLTHROUGH */
/* known values */
case 1:
case 0:
UTFMODE = utf_flag;
break;
}
/* Disable during .profile/ENV reading */
restricted_shell |= Flag(FRESTRICTED);
Flag(FRESTRICTED) = 0;
errexit = Flag(FERREXIT);
Flag(FERREXIT) = 0;
/* save flags for "set +o" handling */
memcpy(baseline_flags, shell_flags, sizeof(shell_flags));
/* disable these because they have special handling */
baseline_flags[(int)FPOSIX] = 0;
baseline_flags[(int)FSH] = 0;
/* ensure these always show up setting, for FPOSIX/FSH */
baseline_flags[(int)FBRACEEXPAND] = 0;
baseline_flags[(int)FUNNYCODE] = 0;
#if !defined(MKSH_SMALL) || defined(DEBUG)
/* mark as initialised */
baseline_flags[(int)FNFLAGS] = 1;
#endif
rndpush(shell_flags, sizeof(shell_flags));
rndset(hash(/*=current_wd*/ cp) ^ hash(argv[0]));
if (as_builtin)
goto skip_startup_files;
/*
* Do this before profile/$ENV so that if it causes problems in them,
* user will know why things broke.
*/
if (!current_wd[0] && Flag(FTALKING))
kwarnf(KWF_PREFIX | KWF_ONEMSG | KWF_NOERRNO,
"can't determine current directory");
if (Flag(FLOGIN))
include(MKSH_SYSTEM_PROFILE, NULL, Ja);
if (Flag(FPRIVILEGED)) {
include(MKSH_SUID_PROFILE, NULL, Ja);
/* note whether -p was enabled during startup */
if (Flag(FPRIVILEGED) == 1)
/* allow set -p to setuid() later */
Flag(FPRIVILEGED) = 3;
else
/* turn off -p if not set explicitly */
change_flag(FPRIVILEGED, OF_INTERNAL, Nee);
/* track shell-imposed changes */
baseline_flags[(int)FPRIVILEGED] = Flag(FPRIVILEGED);
} else {
if (Flag(FLOGIN))
include(substitute("$HOME/.profile", 0), NULL, Ja);
if (Flag(FTALKING)) {
cp = substitute("${ENV:-" MKSHRC_PATH "}", DOTILDE);
if (cp[0] != '\0')
include(cp, NULL, Ja);
}
}
if (restricted_shell) {
c_builtin(restr_com);
/* After typeset command... */
Flag(FRESTRICTED) = 1;
/* track shell-imposed changes */
baseline_flags[(int)FRESTRICTED] = 1;
}
Flag(FERREXIT) = errexit;
if (Flag(FTALKING) && s)
hist_init(s);
else {
/* set after ENV */
skip_startup_files:
Flag(FTRACKALL) = 1;
/* track shell-imposed change (might lower surprise) */
baseline_flags[(int)FTRACKALL] = 1;
}
alarm_init();
*sp = s;
}
/* this indirection barrier reduces stack usage during normal operation */
int
main(int argc, const char *argv[])
{
int rv;
Source *s;
main_init(argc, argv, &s);
if (as_builtin) {
rv = c_builtin(e->loc->argv) & 0xFF;
exstat = rv;
unwind(LEXIT);
/* NOTREACHED */
} else {
rv = shell(s, 0) & 0xFF;
/* NOTREACHED */
}
return (rv);
}
int
include(const char *name, const char **argv, Wahr intr_ok)
{
Source *volatile s = NULL;
struct shf *shf;
const char **volatile old_argv;
volatile int old_argc;
int i;
shf = shf_open(name, O_RDONLY | O_MAYEXEC, 0, SHF_MAPHI | SHF_CLEXEC);
if (shf == NULL)
return (-1);
if (argv) {
old_argv = e->loc->argv;
old_argc = e->loc->argc;
} else {
old_argv = NULL;
old_argc = 0;
}
newenv(E_INCL);
if ((i = kshsetjmp(e->jbuf))) {
quitenv(s ? s->u.shf : NULL);
if (old_argv) {
e->loc->argv = old_argv;
e->loc->argc = old_argc;
}
switch (i) {
case LRDERR:
return (-2);
case LRETURN:
case LERROR:
case LERREXT:
/* see below */
return (exstat & 0xFF);
case LINTR:
/*
* intr_ok is set if we are including .profile or $ENV.
* If user ^Cs out, we don't want to kill the shell...
*/
if (intr_ok && ((exstat & 0xFF) - 128) != SIGTERM)
return (1);
/* FALLTHROUGH */
case LEXIT:
case LLEAVE:
case LSHELL:
unwind(i);
/* NOTREACHED */
default:
kerrf0(KWF_INTERNAL | KWF_ERR(0xFF) | KWF_NOERRNO,
Tunexpected_type, Tunwind, Tsource, i);
/* NOTREACHED */
}
}
if (argv) {
e->loc->argv = argv;
e->loc->argc = 0;
while (argv[e->loc->argc + 1])
++e->loc->argc;
}
s = pushs(SFILE, ATEMP);
s->u.shf = shf;
strdupx(s->file, name, ATEMP);
i = shell(s, 1);
quitenv(s->u.shf);
if (old_argv) {
e->loc->argv = old_argv;
e->loc->argc = old_argc;
}
/* & 0xFF to ensure value not -1 */
return (i & 0xFF);
}
/* spawn a command into a shell optionally keeping track of the line number */
int
command(const char *comm, int line)
{
Source *s, *sold = source;
int rv;
s = pushs(SSTRING, ATEMP);
s->start = s->str = comm;
s->line = line;
rv = shell(s, 1);
source = sold;
return (rv);
}
/*
* run the commands from the input source, returning status.
*/
int
shell(Source * volatile s, volatile int level)
{
struct op *t;
volatile Wahr wastty = isWahr(s->flags & SF_TTY);
volatile kby attempts = 13;
volatile Wahr interactive = (level == 0) && Flag(FTALKING);
Source *volatile old_source = source;
int i;
newenv(level == 2 ? E_EVAL : E_PARSE);
if (level == 2)
e->flags |= EF_IN_EVAL;
if (interactive)
really_exit = Nee;
switch ((i = kshsetjmp(e->jbuf))) {
case 0:
break;
case LBREAK:
case LCONTIN:
/* assert: interactive == Nee */
source = old_source;
quitenv(NULL);
if (level == 2) {
/* keep on going */
unwind(i);
/* NOTREACHED */
}
kerrf0(KWF_INTERNAL | KWF_ERR(0xFF) | KWF_NOERRNO,
Tf_cant_s, Tshell, i == LBREAK ? Tbreak : Tcontinue);
/* NOTREACHED */
case LRDERR:
if (level == 0)
/* run exit traps */
unwind(LEXIT);
/* FALLTHROUGH */
case LINTR:
/* we get here if SIGINT not caught or ignored */
case LERROR:
case LERREXT:
case LSHELL:
if (interactive) {
if (i == LINTR)
shellf(Tnl);
/*
* Reset any eof that was read as part of a
* multiline command.
*/
if (Flag(FIGNOREEOF) && s->type == SEOF && wastty)
s->type = SSTDIN;
/*
* Used by exit command to get back to
* top level shell. Kind of strange since
* interactive is set if we are reading from
* a tty, but to have stopped jobs, one only
* needs FMONITOR set (not FTALKING/SF_TTY)...
*/
/* toss any input we have so far */
yyrecursive_pop(Ja);
s->start = s->str = null;
retrace_info = NULL;
herep = heres;
break;
} else if (i == LSHELL && level == 0)
/* run exit traps */
unwind(LEXIT);
/* FALLTHROUGH */
case LEXIT:
case LLEAVE:
case LRETURN:
source = old_source;
quitenv(NULL);
if (i == LERREXT && level == 2)
return (exstat & 0xFF);
/* keep on going */
unwind(i);
/* NOTREACHED */
default:
source = old_source;
quitenv(NULL);
kerrf0(KWF_INTERNAL | KWF_ERR(0xFF) | KWF_NOERRNO,
Tunexpected_type, Tunwind, Tshell, i);
/* NOTREACHED */
}
while (/* CONSTCOND */ 1) {
if (trap)
runtraps(0);
if (s->next == NULL) {
if (Flag(FVERBOSE))
s->flags |= SF_ECHO;
else
s->flags &= ~SF_ECHO;
}
if (interactive) {
j_notify();
set_prompt(PS1, s);
}
t = compile(s, Ja);
if (interactive)
histsave(&s->line, NULL, HIST_FLUSH, Ja);
if (!t)
goto source_no_tree;
if (t->type == TEOF) {
if (wastty && Flag(FIGNOREEOF) && --attempts > 0) {
shellf("Use 'exit' to leave mksh\n");
s->type = SSTDIN;
} else if (wastty && !really_exit &&