1 /* $OpenBSD: main.c,v 1.57 2015/09/10 22:48:58 nicm Exp $ */
2 /* $OpenBSD: tty.c,v 1.10 2014/08/10 02:44:26 guenther Exp $ */
3 /* $OpenBSD: io.c,v 1.26 2015/09/11 08:00:27 guenther Exp $ */
4 /* $OpenBSD: table.c,v 1.16 2015/09/01 13:12:31 tedu Exp $ */
7 * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
8 * 2011, 2012, 2013, 2014, 2015, 2016
9 * mirabilos <m@mirbsd.org>
11 * Provided that these terms and disclaimer and all copyright notices
12 * are retained or reproduced in an accompanying document, permission
13 * is granted to deal in this work without restriction, including un-
14 * limited rights to use, publicly perform, distribute, sell, modify,
15 * merge, give away, or sublicence.
17 * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
18 * the utmost extent permitted by applicable law, neither express nor
19 * implied; without malicious intent or gross negligence. In no event
20 * may a licensor, author or contributor be held liable for indirect,
21 * direct, other damage, loss, or other issues arising in any way out
22 * of dealing in the work, even if advised of the possibility of such
23 * damage or existence of a defect, except proven that it results out
24 * of said person's immediate fault when using the work as intended.
30 #if HAVE_LANGINFO_CODESET
33 #if HAVE_SETLOCALE_CTYPE
37 __RCSID("$MirOS: src/bin/mksh/main.c,v 1.317 2016/08/04 20:51:35 tg Exp $");
39 extern char **environ;
42 #define MKSHRC_PATH "~/.mkshrc"
45 #ifndef MKSH_DEFAULT_TMPDIR
46 #define MKSH_DEFAULT_TMPDIR MKSH_UNIXROOT "/tmp"
49 static uint8_t isuc(const char *);
50 static int main_init(int, const char *[], Source **, struct block **);
51 void chvt_reinit(void);
52 static void reclaim(void);
53 static void remove_temps(struct temp *);
54 static mksh_uari_t rndsetup(void);
56 static void x_sigwinch(int);
59 static const char initifs[] = "IFS= \t\n";
61 static const char initsubs[] =
62 "${PS2=> } ${PS3=#? } ${PS4=+ } ${SECONDS=0} ${TMOUT=0} ${EPOCHREALTIME=}";
64 static const char *initcoms[] = {
65 Ttypeset, "-r", initvsn, NULL,
66 Ttypeset, "-x", "HOME", TPATH, TSHELL, NULL,
67 Ttypeset, "-i10", "COLUMNS", "LINES", "SECONDS", "TMOUT", NULL,
69 "integer=\\typeset -i",
71 /* not "alias -t --": hash -r needs to work */
72 "hash=\\builtin alias -t",
73 "type=\\builtin whence -v",
74 "autoload=\\typeset -fu",
75 "functions=\\typeset -f",
76 "history=\\builtin fc -l",
77 "nameref=\\typeset -n",
79 "r=\\builtin fc -e -",
82 /* this is what AT&T ksh seems to track, with the addition of emacs */
84 Tcat, "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls",
85 "make", "mv", "pr", "rm", "sed", Tsh, "vi", "who", NULL,
89 static const char *restr_com[] = {
90 Ttypeset, "-r", TPATH, "ENV", TSHELL, NULL
93 static bool initio_done;
95 /* top-level parsing and execution environment */
96 static struct env env;
104 ALLOC_ITEM alloc_INT;
105 void *dataptr, *stkptr, *mallocptr;
106 #if defined(__GLIBC__) && (__GLIBC__ >= 2)
113 cp = alloc(sizeof(*bufptr) - sizeof(ALLOC_ITEM), APERM);
115 /* clear the allocated space, for valgrind */
116 memset(cp, 0, sizeof(*bufptr) - sizeof(ALLOC_ITEM));
118 /* undo what alloc() did to the malloc result address */
119 bufptr = (void *)(cp - sizeof(ALLOC_ITEM));
120 /* PIE or something similar provides us with deltas here */
121 bufptr->dataptr = &rndsetupstate;
122 /* ASLR in at least Windows, Linux, some BSDs */
123 bufptr->stkptr = &bufptr;
124 /* randomised malloc in BSD (and possibly others) */
125 bufptr->mallocptr = bufptr;
126 #if defined(__GLIBC__) && (__GLIBC__ >= 2)
127 /* glibc pointer guard */
128 sigsetjmp(bufptr->jbuf, 1);
130 /* introduce variation (and yes, second arg MBZ for portability) */
131 mksh_TIME(bufptr->tv);
133 #ifdef MKSH_ALLOC_CATCH_UNDERRUNS
134 mprotect(((char *)bufptr) + 4096, 4096, PROT_READ | PROT_WRITE);
136 h = chvt_rndsetup(bufptr, sizeof(*bufptr));
139 return ((mksh_uari_t)h);
145 kshpid = procpid = getpid();
151 static const char *empty_argv[] = {
156 isuc(const char *cx) {
163 /* uppercase a string duplicate */
164 strdupx(x, cx, ATEMP);
166 while ((*cp = ksh_toupper(*cp)))
169 /* check for UTF-8 */
170 if (strstr(x, "UTF-8") || strstr(x, "UTF8"))
173 /* free copy and out */
179 main_init(int argc, const char *argv[], Source **sp, struct block **lp)
184 unsigned char restricted_shell, errexit, utf_flag;
186 const char *ccp, **wp;
189 #if !defined(_PATH_DEFPATH) && defined(_CS_PATH)
194 for (i = 0; i < 3; ++i)
196 setmode(i, O_BINARY);
199 /* do things like getpgrp() et al. */
202 /* make sure argv[] is sane, for weird OSes */
209 /* initialise permanent Area */
211 /* max. name length: -2147483648 = 11 (+ NUL) */
212 vtemp = alloc(offsetof(struct tbl, name[0]) + 12, APERM);
214 /* set up base environment */
217 /* set up global l->vars and l->funs */
220 /* Do this first so output routines (eg, errorf, shellf) can work */
223 /* determine the basename (without '-' or path) of the executable */
225 goto begin_parse_kshname;
226 while ((i = ccp[argi++])) {
239 * Turn on nohup by default. (AT&T ksh does not have a nohup
240 * option - it always sends the hup).
245 * Turn on brace expansion by default. AT&T kshs that have
246 * alternation always have it on.
248 Flag(FBRACEEXPAND) = 1;
251 * Turn on "set -x" inheritance by default.
253 Flag(FXTRACEREC) = 1;
255 /* define built-in commands and see if we were called as one */
256 ktinit(APERM, &builtins,
257 /* currently up to 54 builtins: 75% of 128 = 2^7 */
259 for (i = 0; mkshbuiltins[i].name != NULL; i++)
260 if (!strcmp(ccp, builtin(mkshbuiltins[i].name,
261 mkshbuiltins[i].func)))
262 Flag(FAS_BUILTIN) = 1;
264 if (!Flag(FAS_BUILTIN)) {
265 /* check for -T option early */
266 argi = parse_args(argv, OF_FIRSTTIME, NULL);
270 #if defined(MKSH_BINSHPOSIX) || defined(MKSH_BINSHREDUCED)
271 /* are we called as -sh or /bin/sh or so? */
272 if (!strcmp(ccp, "sh" MKSH_EXE_EXT)) {
273 /* either also turns off braceexpand */
274 #ifdef MKSH_BINSHPOSIX
275 /* enable better POSIX conformance */
276 change_flag(FPOSIX, OF_FIRSTTIME, true);
278 #ifdef MKSH_BINSHREDUCED
279 /* enable kludge/compat mode */
280 change_flag(FSH, OF_FIRSTTIME, true);
294 /* set up variable and command dictionaries */
295 ktinit(APERM, &taliases, 0);
296 ktinit(APERM, &aliases, 0);
298 ktinit(APERM, &homedirs, 0);
301 /* define shell keywords */
306 /* initialise tty size before importing environment */
310 def_path = _PATH_DEFPATH;
313 if ((k = confstr(_CS_PATH, NULL, 0)) > 0 &&
314 confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1)
319 * this is uniform across all OSes unless it
320 * breaks somewhere hard; don't try to optimise,
321 * e.g. add stuff for Interix or remove /usr
322 * for HURD, because e.g. Debian GNU/HURD is
323 * "keeping a regular /usr"; this is supposed
324 * to be a sane 'basic' default PATH
326 def_path = MKSH_UNIXROOT "/bin" MKSH_PATHSEPS
327 MKSH_UNIXROOT "/usr/bin" MKSH_PATHSEPS
328 MKSH_UNIXROOT "/sbin" MKSH_PATHSEPS
329 MKSH_UNIXROOT "/usr/sbin";
333 * Set PATH to def_path (will set the path global variable).
334 * (import of environment below will probably change this setting).
337 /* setstr can't fail here */
338 setstr(vp, def_path, KSH_RETURN_ERROR);
340 #ifndef MKSH_NO_CMDLINE_EDITING
342 * Set edit mode to emacs by default, may be overridden
343 * by the environment or the user. Also, we want tab completion
344 * on in vi by default.
346 change_flag(FEMACS, OF_SPECIAL, true);
348 Flag(FVITABCOMPLETE) = 1;
352 /* import environment */
353 if (environ != NULL) {
354 wp = (const char **)environ;
355 while (*wp != NULL) {
357 typeset(*wp, IMPORT | EXPORT, 0, 0, 0);
363 typeset(initifs, 0, 0, 0, 0);
365 /* assign default shell variable values */
366 substitute(initsubs, 0);
368 /* Figure out the current working directory and set $PWD */
371 /* Try to use existing $PWD if it is valid */
372 set_current_wd((mksh_abspath(cp) && test_eval(NULL, TO_FILEQ, cp,
373 Tdot, true)) ? cp : NULL);
375 simplify_path(current_wd);
376 /* Only set pwd if we know where we are or if it had a bogus value */
377 if (current_wd[0] || *cp)
378 /* setstr can't fail here */
379 setstr(vp, current_wd, KSH_RETURN_ERROR);
381 for (wp = initcoms; *wp != NULL; wp++) {
386 setint_n(global("OPTIND"), 1, 10);
392 safe_prompt = ksheuid ? "$ " : "# ";
394 /* Set PS1 if unset or we are root and prompt doesn't contain a # */
395 if (!(vp->flag & ISSET) ||
396 (!ksheuid && !strchr(str_val(vp), '#')))
397 /* setstr can't fail here */
398 setstr(vp, safe_prompt, KSH_RETURN_ERROR);
399 setint_n((vp = global("BASHPID")), 0, 10);
401 setint_n((vp = global("PGRP")), (mksh_uari_t)kshpgrp, 10);
403 setint_n((vp = global("PPID")), (mksh_uari_t)kshppid, 10);
405 setint_n((vp = global("USER_ID")), (mksh_uari_t)ksheuid, 10);
407 setint_n((vp = global("KSHUID")), (mksh_uari_t)kshuid, 10);
409 setint_n((vp = global("KSHEGID")), (mksh_uari_t)kshegid, 10);
411 setint_n((vp = global("KSHGID")), (mksh_uari_t)kshgid, 10);
413 setint_n((vp = global("RANDOM")), rndsetup(), 10);
415 setint_n((vp_pipest = global("PIPESTATUS")), 0, 10);
417 /* Set this before parsing arguments */
418 Flag(FPRIVILEGED) = (kshuid != ksheuid || kshgid != kshegid) ? 2 : 0;
420 /* this to note if monitor is set on command line (see below) */
421 #ifndef MKSH_UNEMPLOYED
422 Flag(FMONITOR) = 127;
424 /* this to note if utf-8 mode is set on command line (see below) */
427 if (!Flag(FAS_BUILTIN)) {
428 argi = parse_args(argv, OF_CMDLINE, NULL);
433 /* process this later only, default to off (hysterical raisins) */
437 if (Flag(FAS_BUILTIN)) {
438 /* auto-detect from environment variables, always */
440 } else if (Flag(FCOMMAND)) {
441 s = pushs(SSTRINGCMDLINE, ATEMP);
442 if (!(s->start = s->str = argv[argi++]))
443 errorf(Tf_optfoo, "", "", 'c', Treq_arg);
445 if (*s->str != ' ' && ctype(*s->str, C_QUOTE))
450 s->flags |= SF_MAYEXEC;
452 #ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT
453 /* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */
454 if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--"))
458 kshname = argv[argi++];
459 } else if (argi < argc && !Flag(FSTDIN)) {
460 s = pushs(SFILE, ATEMP);
463 * A bug in OS/2 extproc (like shebang) handling makes
464 * it not pass the full pathname of a script, so we need
465 * to search for it. This changes the behaviour of a
466 * simple "mksh foo", but can't be helped.
468 s->file = search_path(argv[argi++], path, X_OK, NULL);
469 if (!s->file || !*s->file)
470 s->file = argv[argi - 1];
472 s->file = argv[argi++];
474 s->u.shf = shf_open(s->file, O_RDONLY, 0,
475 SHF_MAPHI | SHF_CLEXEC);
476 if (s->u.shf == NULL) {
477 shl_stdout_ok = false;
478 warningf(true, Tf_sD_s, s->file, cstrerror(errno));
479 /* mandated by SUSv4 */
486 s = pushs(SSTDIN, ATEMP);
488 s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0),
490 if (isatty(0) && isatty(2)) {
491 Flag(FTALKING) = Flag(FTALKING_I) = 1;
492 /* The following only if isatty(0) */
494 s->u.shf->flags |= SHF_INTERRUPT;
499 /* this bizarreness is mandated by POSIX */
500 if (fstat(0, &s_stdin) >= 0 && S_ISCHR(s_stdin.st_mode) &&
504 /* initialise job control */
506 /* do this after j_init() which calls tty_init_state() */
507 if (Flag(FTALKING)) {
509 #ifndef MKSH_ASSUME_UTF8
510 /* auto-detect from locale or environment */
512 #else /* this may not be an #elif */
516 /* always disable UTF-8 (for interactive) */
521 #ifndef MKSH_NO_CMDLINE_EDITING
527 sigtraps[SIGWINCH].flags |= TF_SHELL_USES;
528 setsig(&sigtraps[SIGWINCH], x_sigwinch,
529 SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP);
533 if (Flag(FAS_BUILTIN)) {
538 l->argc = argc - argi;
540 * allocate a new array because otherwise, when we modify
541 * it in-place, ps(1) output changes; the meaning of argc
542 * here is slightly different as it excludes kshname, and
543 * we add a trailing NULL sentinel as well
545 l->argv = alloc2(l->argc + 2, sizeof(void *), APERM);
546 l->argv[0] = kshname;
547 memcpy(&l->argv[1], &argv[argi], l->argc * sizeof(void *));
548 l->argv[l->argc + 1] = NULL;
552 /* divine the initial state of the utf8-mode Flag */
556 /* auto-detect from locale or environment */
558 #if HAVE_SETLOCALE_CTYPE
559 ccp = setlocale(LC_CTYPE, "");
560 #if HAVE_LANGINFO_CODESET
562 ccp = nl_langinfo(CODESET);
569 /* auto-detect from environment */
571 /* these were imported from environ earlier */
573 ccp = str_val(global("LC_ALL"));
575 ccp = str_val(global("LC_CTYPE"));
577 ccp = str_val(global("LANG"));
581 /* not set on command line, not FTALKING */
595 /* Disable during .profile/ENV reading */
596 restricted_shell = Flag(FRESTRICTED);
597 Flag(FRESTRICTED) = 0;
598 errexit = Flag(FERREXIT);
602 * Do this before profile/$ENV so that if it causes problems in them,
603 * user will know why things broke.
605 if (!current_wd[0] && Flag(FTALKING))
606 warningf(false, "can't determine current directory");
609 include(MKSH_SYSTEM_PROFILE, 0, NULL, true);
610 if (!Flag(FPRIVILEGED)) {
612 include(substitute("$HOME/.profile", 0), 0, NULL, true);
613 if (Flag(FTALKING)) {
614 cp = substitute(substitute("${ENV:-" MKSHRC_PATH "}",
617 include(cp, 0, NULL, true);
620 include(MKSH_SUID_PROFILE, 0, NULL, true);
621 /* turn off -p if not set explicitly */
622 if (Flag(FPRIVILEGED) != 1)
623 change_flag(FPRIVILEGED, OF_INTERNAL, false);
626 if (restricted_shell) {
627 shcomexec(restr_com);
628 /* After typeset command... */
629 Flag(FRESTRICTED) = 1;
631 Flag(FERREXIT) = errexit;
633 if (Flag(FTALKING) && s)
646 /* this indirection barrier reduces stack usage during normal operation */
649 main(int argc, const char *argv[])
655 if ((rv = main_init(argc, argv, &s, &l)) == 0) {
656 if (Flag(FAS_BUILTIN)) {
657 rv = shcomexec(l->argv);
667 include(const char *name, int argc, const char **argv, bool intr_ok)
669 Source *volatile s = NULL;
671 const char **volatile old_argv;
672 volatile int old_argc;
675 shf = shf_open(name, O_RDONLY, 0, SHF_MAPHI | SHF_CLEXEC);
680 old_argv = e->loc->argv;
681 old_argc = e->loc->argc;
687 if ((i = kshsetjmp(e->jbuf))) {
688 quitenv(s ? s->u.shf : NULL);
690 e->loc->argv = old_argv;
691 e->loc->argc = old_argc;
697 return (exstat & 0xFF);
700 * intr_ok is set if we are including .profile or $ENV.
701 * If user ^Cs out, we don't want to kill the shell...
703 if (intr_ok && ((exstat & 0xFF) - 128) != SIGTERM)
712 internal_errorf("include %d", i);
720 s = pushs(SFILE, ATEMP);
722 strdupx(s->file, name, ATEMP);
726 e->loc->argv = old_argv;
727 e->loc->argc = old_argc;
729 /* & 0xff to ensure value not -1 */
733 /* spawn a command into a shell optionally keeping track of the line number */
735 command(const char *comm, int line)
737 Source *s, *sold = source;
740 s = pushs(SSTRING, ATEMP);
741 s->start = s->str = comm;
743 rv = shell(s, false);
749 * run the commands from the input source, returning status.
752 shell(Source * volatile s, volatile bool toplevel)
755 volatile bool wastty = tobool(s->flags & SF_TTY);
756 volatile uint8_t attempts = 13;
757 volatile bool interactive = Flag(FTALKING) && toplevel;
758 volatile bool sfirst = true;
759 Source *volatile old_source = source;
765 switch ((i = kshsetjmp(e->jbuf))) {
769 /* we get here if SIGINT not caught or ignored */
776 * Reset any eof that was read as part of a
779 if (Flag(FIGNOREEOF) && s->type == SEOF && wastty)
782 * Used by exit command to get back to
783 * top level shell. Kind of strange since
784 * interactive is set if we are reading from
785 * a tty, but to have stopped jobs, one only
786 * needs FMONITOR set (not FTALKING/SF_TTY)...
788 /* toss any input we have so far */
789 yyrecursive_pop(true);
790 s->start = s->str = null;
807 internal_errorf("shell %d", i);
810 while (/* CONSTCOND */ 1) {
814 if (s->next == NULL) {
818 s->flags &= ~SF_ECHO;
824 t = compile(s, sfirst);
826 histsave(&s->line, NULL, HIST_FLUSH, true);
830 if (t->type == TEOF) {
831 if (wastty && Flag(FIGNOREEOF) && --attempts > 0) {
832 shellf("Use 'exit' to leave mksh\n");
834 } else if (wastty && !really_exit &&
835 j_stopped_running()) {
840 * this for POSIX which says EXIT traps
841 * shall be taken in the environment
842 * immediately after the last command
849 } else if ((s->flags & SF_MAYEXEC) && t->type == TCOM)
850 t->u.evalflags |= DOTCOMEXEC;
851 if (!Flag(FNOEXEC) || (s->flags & SF_TTY))
852 exstat = execute(t, 0, NULL) & 0xFF;
854 if (t->type != TEOF && interactive && really_exit)
862 return (exstat & 0xFF);
865 /* return to closest error handler or shell(), exit if none found */
866 /* note: i MUST NOT be 0 */
871 * This is a kludge. We need to restore everything that was
872 * changed in the new environment, see cid 1005090337C7A669439
873 * and 10050903386452ACBF1, but fail to even save things most of
874 * the time. funcs.c:c_eval() changes FERREXIT temporarily to 0,
875 * which needs to be restored thus (related to Debian #696823).
876 * We did not save the shell flags, so we use a special or'd
877 * value here... this is mostly to clean up behind *other*
878 * callers of unwind(LERROR) here; exec.c has the regular case.
880 if (Flag(FERREXIT) & 0x80) {
881 /* GNU bash does not run this trapsig */
883 Flag(FERREXIT) &= ~0x80;
886 /* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */
887 if (i == LEXIT || ((i == LERROR || i == LINTR) &&
888 sigtraps[ksh_SIGEXIT].trap &&
889 (!Flag(FTALKING) || Flag(FERREXIT)))) {
891 runtrap(&sigtraps[ksh_SIGEXIT], trap_nested == 1);
894 } else if (Flag(FERREXIT) == 1 && (i == LERROR || i == LINTR)) {
896 runtrap(&sigtraps[ksh_SIGERR], trap_nested == 1);
901 while (/* CONSTCOND */ 1) {
908 kshlongjmp(e->jbuf, i);
912 e->flags |= EF_FAKE_SIGDIE;
927 * struct env includes ALLOC_ITEM for alignment constraints
928 * so first get the actually used memory, then assign it
930 cp = alloc(sizeof(struct env) - sizeof(ALLOC_ITEM), ATEMP);
931 /* undo what alloc() did to the malloc result address */
932 ep = (void *)(cp - sizeof(ALLOC_ITEM));
933 /* initialise public members of struct env (not the ALLOC_ITEM) */
939 ep->yyrecursive_statep = NULL;
942 /* jump buffer is invalid because flags == 0 */
947 quitenv(struct shf *shf)
953 yyrecursive_pop(true);
954 while (ep->oenv && ep->oenv->loc != ep->loc)
956 if (ep->savefd != NULL) {
957 for (fd = 0; fd < NUFILE; fd++)
958 /* if ep->savefd[fd] < 0, means fd was closed */
960 restfd(fd, ep->savefd[fd]);
962 /* Clear any write errors */
963 shf_reopen(2, SHF_WR, shl_out);
966 * Bottom of the stack.
967 * Either main shell is exiting or cleanup_parents_env() was called.
969 if (ep->oenv == NULL) {
974 if (ep->type == E_NONE) {
975 /* Main shell exiting? */
976 #if HAVE_PERSISTENT_HISTORY
981 if (ep->flags & EF_FAKE_SIGDIE) {
982 int sig = (exstat & 0xFF) - 128;
985 * ham up our death a bit (AT&T ksh
986 * only seems to do this for SIGTERM)
987 * Don't do it for SIGQUIT, since we'd
990 if ((sig == SIGINT || sig == SIGTERM) &&
991 (kshpgrp == kshpid)) {
992 setsig(&sigtraps[sig], SIG_DFL,
993 SS_RESTORE_CURR | SS_FORCE);
1002 #ifndef MKSH_NO_CMDLINE_EDITING
1005 #ifndef MKSH_NOPROSPECTOFWORK
1006 /* block at least SIGCHLD during/after afreeall */
1007 sigprocmask(SIG_BLOCK, &sm_sigchld, NULL);
1010 for (fd = 3; fd < NUFILE; fd++)
1011 if ((i = fcntl(fd, F_GETFD, 0)) != -1 &&
1018 exit(exstat & 0xFF);
1026 /* free the struct env - tricky due to the ALLOC_ITEM inside */
1028 afree(cp + sizeof(ALLOC_ITEM), ATEMP);
1031 /* Called after a fork to cleanup stuff left over from parents environment */
1033 cleanup_parents_env(void)
1039 * Don't clean up temporary files - parent will probably need them.
1040 * Also, can't easily reclaim memory since variables, etc. could be
1044 /* close all file descriptors hiding in savefd */
1045 for (ep = e; ep; ep = ep->oenv) {
1047 for (fd = 0; fd < NUFILE; fd++)
1048 if (ep->savefd[fd] > 0)
1049 close(ep->savefd[fd]);
1050 afree(ep->savefd, &ep->area);
1054 if (ep->type != E_NONE)
1063 /* Called just before an execve cleanup stuff temporary files */
1065 cleanup_proc_env(void)
1069 for (ep = e; ep; ep = ep->oenv)
1070 remove_temps(ep->temps);
1073 /* remove temp files and free ATEMP Area */
1079 while ((l = e->loc) && (!e->oenv || e->oenv->loc != l)) {
1084 remove_temps(e->temps);
1088 * if the memory backing source is reclaimed, things
1089 * will end up badly when a function expecting it to
1090 * be valid is run; a NULL pointer is easily debugged
1092 if (source && source->areap == &e->area)
1098 remove_temps(struct temp *tp)
1101 if (tp->pid == procpid)
1108 * Initialise tty_fd. Used for tracking the size of the terminal,
1109 * saving/resetting tty modes upon forground job completion, and
1110 * for setting up the tty process group. Return values:
1111 * 0 = got controlling tty
1112 * 1 = got terminal but no controlling tty
1113 * 2 = cannot find a terminal
1115 * 4 = cannot make fd close-on-exec
1116 * An existing tty_fd is cached if no "better" one could be found,
1117 * i.e. if tty_devtty was already set or the new would not set it.
1122 int fd, rv, eno = 0;
1123 bool do_close = false, is_devtty = true;
1126 /* already got a tty which is /dev/tty */
1131 /*XXX imake style */
1133 /* fd 3 on UWIN _is_ /dev/tty (or our controlling tty) */
1138 if ((fd = open(T_devtty, O_RDWR, 0)) >= 0) {
1145 /* already got a non-devtty one */
1151 if (isatty((fd = 0)) || isatty((fd = 2)))
1153 /* cannot find one */
1155 /* assert: do_close == false */
1159 if ((rv = fcntl(fd, F_DUPFD, FDBASE)) < 0) {
1164 if (fcntl(rv, F_SETFD, FD_CLOEXEC) < 0) {
1171 tty_devtty = is_devtty;
1180 /* A shell error occurred (eg, syntax error, etc.) */
1182 #define VWARNINGF_ERRORPREFIX 1
1183 #define VWARNINGF_FILELINE 2
1184 #define VWARNINGF_BUILTIN 4
1185 #define VWARNINGF_INTERNAL 8
1187 static void vwarningf(unsigned int, const char *, va_list)
1188 MKSH_A_FORMAT(__printf__, 2, 0);
1191 vwarningf(unsigned int flags, const char *fmt, va_list ap)
1194 if (flags & VWARNINGF_INTERNAL)
1195 shf_fprintf(shl_out, Tf_sD_, "internal error");
1196 if (flags & VWARNINGF_ERRORPREFIX)
1197 error_prefix(tobool(flags & VWARNINGF_FILELINE));
1198 if ((flags & VWARNINGF_BUILTIN) &&
1199 /* not set when main() calls parse_args() */
1200 builtin_argv0 && builtin_argv0 != kshname)
1201 shf_fprintf(shl_out, Tf_sD_, builtin_argv0);
1202 shf_vfprintf(shl_out, fmt, ap);
1203 shf_putchar('\n', shl_out);
1209 errorfx(int rc, const char *fmt, ...)
1215 /* debugging: note that stdout not valid */
1216 shl_stdout_ok = false;
1219 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va);
1225 errorf(const char *fmt, ...)
1231 /* debugging: note that stdout not valid */
1232 shl_stdout_ok = false;
1235 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va);
1240 /* like errorf(), but no unwind is done */
1242 warningf(bool fileline, const char *fmt, ...)
1247 vwarningf(VWARNINGF_ERRORPREFIX | (fileline ? VWARNINGF_FILELINE : 0),
1253 * Used by built-in utilities to prefix shell and utility name to message
1254 * (also unwinds environments for special builtins).
1257 bi_errorf(const char *fmt, ...)
1261 /* debugging: note that stdout not valid */
1262 shl_stdout_ok = false;
1267 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE |
1268 VWARNINGF_BUILTIN, fmt, va);
1272 * POSIX special builtins and ksh special builtins cause
1273 * non-interactive shells to exit. XXX may not want LERROR here
1276 builtin_argv0 = NULL;
1281 /* Called when something that shouldn't happen does */
1283 internal_errorf(const char *fmt, ...)
1288 vwarningf(VWARNINGF_INTERNAL, fmt, va);
1294 internal_warningf(const char *fmt, ...)
1299 vwarningf(VWARNINGF_INTERNAL, fmt, va);
1303 /* used by error reporting functions to print "ksh: .kshrc[25]: " */
1305 error_prefix(bool fileline)
1307 /* Avoid foo: foo[2]: ... */
1308 if (!fileline || !source || !source->file ||
1309 strcmp(source->file, kshname) != 0)
1310 shf_fprintf(shl_out, Tf_sD_, kshname + (*kshname == '-'));
1311 if (fileline && source && source->file != NULL) {
1312 shf_fprintf(shl_out, "%s[%lu]: ", source->file,
1313 (unsigned long)(source->errline ?
1314 source->errline : source->line));
1315 source->errline = 0;
1319 /* printf to shl_out (stderr) with flush */
1321 shellf(const char *fmt, ...)
1326 /* shl_out may not be set up yet... */
1329 shf_vfprintf(shl_out, fmt, va);
1334 /* printf to shl_stdout (stdout) */
1336 shprintf(const char *fmt, ...)
1341 internal_errorf("shl_stdout not valid");
1343 shf_vfprintf(shl_stdout, fmt, va);
1347 /* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */
1353 return (fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ?
1363 struct shf shf_iob[NSHF_IOB];
1372 /* force buffer allocation */
1373 shf_fdopen(1, SHF_WR, shl_stdout);
1374 shf_fdopen(2, SHF_WR, shl_out);
1375 shf_fdopen(2, SHF_WR, shl_xtrace);
1377 if ((lfp = getenv("SDMKSH_PATH")) == NULL) {
1378 if ((lfp = getenv("HOME")) == NULL || !mksh_abspath(lfp))
1379 errorf("cannot get home directory");
1380 lfp = shf_smprintf(Tf_sSs, lfp, "mksh-dbg.txt");
1383 if ((shl_dbg_fd = open(lfp, O_WRONLY | O_APPEND | O_CREAT, 0600)) < 0)
1384 errorf("cannot open debug output file %s", lfp);
1385 if (shl_dbg_fd < FDBASE) {
1388 nfd = fcntl(shl_dbg_fd, F_DUPFD, FDBASE);
1390 if ((shl_dbg_fd = nfd) == -1)
1391 errorf("cannot dup debug output file");
1393 fcntl(shl_dbg_fd, F_SETFD, FD_CLOEXEC);
1394 shf_fdopen(shl_dbg_fd, SHF_WR, shl_dbg);
1400 /* A dup2() with error checking */
1402 ksh_dup2(int ofd, int nfd, bool errok)
1406 if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF))
1407 errorf("too many files open in shell");
1410 /*XXX imake style */
1412 fcntl(nfd, F_SETFD, 0);
1419 * Move fd from user space (0 <= fd < 10) to shell space (fd >= 10),
1420 * set close-on-exec flag. See FDBASE in sh.h, maybe 24 not 10 here.
1427 if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 &&
1428 (errno == EBADF || errno == EPERM))
1430 if (nfd < 0 || nfd > SHRT_MAX)
1431 errorf("too many files open in shell");
1432 fcntl(nfd, F_SETFD, FD_CLOEXEC);
1433 return ((short)nfd);
1437 restfd(int fd, int ofd)
1440 shf_flush(&shf_iob[/* fd */ 2]);
1442 /* original fd closed */
1444 else if (fd != ofd) {
1445 /*XXX: what to do if this dup fails? */
1446 ksh_dup2(ofd, fd, true);
1457 errorf("can't create pipe - try again");
1458 pv[0] = savefd(lpv[0]);
1459 if (pv[0] != lpv[0])
1461 pv[1] = savefd(lpv[1]);
1462 if (pv[1] != lpv[1])
1474 * Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn
1475 * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor.
1478 check_fd(const char *name, int mode, const char **emsgp)
1482 if (!name[0] || name[1])
1483 goto illegal_fd_name;
1485 return (coproc_getfd(mode, emsgp));
1486 if (!ksh_isdigit(name[0])) {
1489 *emsgp = "illegal file descriptor name";
1493 if ((fl = fcntl((fd = ksh_numdig(name[0])), F_GETFL, 0)) < 0) {
1495 *emsgp = "bad file descriptor";
1500 * X_OK is a kludge to disable this check for dups (x<&1):
1501 * historical shells never did this check (XXX don't know what
1502 * POSIX has to say).
1504 if (!(mode & X_OK) && fl != O_RDWR && (
1505 ((mode & R_OK) && fl != O_RDONLY) ||
1506 ((mode & W_OK) && fl != O_WRONLY))) {
1508 *emsgp = (fl == O_WRONLY) ?
1509 "fd not open for reading" :
1510 "fd not open for writing";
1516 /* Called once from main */
1520 coproc.read = coproc.readw = coproc.write = -1;
1525 /* Called by c_read() when eof is read - close fd if it is the co-process fd */
1527 coproc_read_close(int fd)
1529 if (coproc.read >= 0 && fd == coproc.read) {
1530 coproc_readw_close(fd);
1537 * Called by c_read() and by iosetup() to close the other side of the
1538 * read pipe, so reads will actually terminate.
1541 coproc_readw_close(int fd)
1543 if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) {
1544 close(coproc.readw);
1550 * Called by c_print when a write to a fd fails with EPIPE and by iosetup
1551 * when co-process input is dup'd
1554 coproc_write_close(int fd)
1556 if (coproc.write >= 0 && fd == coproc.write) {
1557 close(coproc.write);
1563 * Called to check for existence of/value of the co-process file descriptor.
1564 * (Used by check_fd() and by c_read/c_print to deal with -p option).
1567 coproc_getfd(int mode, const char **emsgp)
1569 int fd = (mode & R_OK) ? coproc.read : coproc.write;
1574 *emsgp = "no coprocess";
1579 * called to close file descriptors related to the coprocess (if any)
1580 * Should be called with SIGCHLD blocked.
1583 coproc_cleanup(int reuse)
1585 /* This to allow co-processes to share output pipe */
1586 if (!reuse || coproc.readw < 0 || coproc.read < 0) {
1587 if (coproc.read >= 0) {
1591 if (coproc.readw >= 0) {
1592 close(coproc.readw);
1596 if (coproc.write >= 0) {
1597 close(coproc.write);
1603 maketemp(Area *ap, Temp_type type, struct temp **tlist)
1612 dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR;
1613 /* add "/shXXXXXX.tmp" plus NUL */
1615 checkoktoadd(len, offsetof(struct temp, tffn[0]) + 14);
1616 tp = alloc(offsetof(struct temp, tffn[0]) + 14 + len, ap);
1622 if (stat(dir, &sb) || !S_ISDIR(sb.st_mode)) {
1628 cp += offsetof(struct temp, tffn[0]);
1629 memcpy(cp, dir, len);
1631 memcpy(cp, "/shXXXXXX.tmp", 14);
1632 /* point to the first of six Xes */
1635 /* cyclically attempt to open a temporary file */
1637 /* generate random part of filename */
1640 cp[len++] = digits_lc[rndget() % 36];
1643 /* check if this one works */
1644 if ((i = binopen3(tp->tffn, O_CREAT | O_EXCL | O_RDWR,
1645 0600)) < 0 && errno != EEXIST)
1649 if (type == TT_FUNSUB) {
1650 /* map us high and mark as close-on-exec */
1651 if ((j = savefd(i)) != i) {
1656 /* operation mode for the shf */
1661 /* shf_fdopen cannot fail, so no fd leak */
1662 tp->shf = shf_fdopen(i, j, NULL);
1671 * We use a similar collision resolution algorithm as Python 2.5.4
1672 * but with a slightly tweaked implementation written from scratch.
1675 #define INIT_TBLSHIFT 3 /* initial table shift (2^3 = 8) */
1676 #define PERTURB_SHIFT 5 /* see Python 2.5.4 Objects/dictobject.c */
1678 static void tgrow(struct table *);
1679 static int tnamecmp(const void *, const void *);
1682 tgrow(struct table *tp)
1684 size_t i, j, osize, mask, perturb;
1685 struct tbl *tblp, **pp;
1686 struct tbl **ntblp, **otblp = tp->tbls;
1688 if (tp->tshift > 29)
1689 internal_errorf("hash table size limit reached");
1691 /* calculate old size, new shift and new size */
1692 osize = (size_t)1 << (tp->tshift++);
1695 ntblp = alloc2(i, sizeof(struct tbl *), tp->areap);
1696 /* multiplication cannot overflow: alloc2 checked that */
1697 memset(ntblp, 0, i * sizeof(struct tbl *));
1699 /* table can get very full when reaching its size limit */
1700 tp->nfree = (tp->tshift == 30) ? 0x3FFF0000UL :
1701 /* but otherwise, only 75% */
1708 for (i = 0; i < osize; i++)
1709 if ((tblp = otblp[i]) != NULL) {
1710 if ((tblp->flag & DEFINED)) {
1711 /* search for free hash table slot */
1712 j = perturb = tblp->ua.hval;
1713 goto find_first_empty_slot;
1714 find_next_empty_slot:
1715 j = (j << 2) + j + perturb + 1;
1716 perturb >>= PERTURB_SHIFT;
1717 find_first_empty_slot:
1718 pp = &ntblp[j & mask];
1720 goto find_next_empty_slot;
1721 /* found an empty hash table slot */
1724 } else if (!(tblp->flag & FINUSE)) {
1725 afree(tblp, tp->areap);
1728 afree(otblp, tp->areap);
1732 ktinit(Area *ap, struct table *tp, uint8_t initshift)
1736 tp->tshift = ((initshift > INIT_TBLSHIFT) ?
1737 initshift : INIT_TBLSHIFT) - 1;
1741 /* table, name (key) to search for, hash(name), rv pointer to tbl ptr */
1743 ktscan(struct table *tp, const char *name, uint32_t h, struct tbl ***ppp)
1745 size_t j, perturb, mask;
1746 struct tbl **pp, *p;
1748 mask = ((size_t)1 << (tp->tshift)) - 1;
1749 /* search for hash table slot matching name */
1751 goto find_first_slot;
1753 j = (j << 2) + j + perturb + 1;
1754 perturb >>= PERTURB_SHIFT;
1756 pp = &tp->tbls[j & mask];
1757 if ((p = *pp) != NULL && (p->ua.hval != h || !(p->flag & DEFINED) ||
1758 strcmp(p->name, name)))
1759 goto find_next_slot;
1760 /* p == NULL if not found, correct found entry otherwise */
1766 /* table, name (key) to enter, hash(n) */
1768 ktenter(struct table *tp, const char *n, uint32_t h)
1770 struct tbl **pp, *p;
1774 if ((p = ktscan(tp, n, h, &pp)))
1777 if (tp->nfree == 0) {
1783 /* create new tbl entry */
1785 checkoktoadd(len, offsetof(struct tbl, name[0]) + 1);
1786 p = alloc(offsetof(struct tbl, name[0]) + ++len, tp->areap);
1789 p->areap = tp->areap;
1793 memcpy(p->name, n, len);
1795 /* enter in tp->tbls */
1802 ktwalk(struct tstate *ts, struct table *tp)
1804 ts->left = (size_t)1 << (tp->tshift);
1805 ts->next = tp->tbls;
1809 ktnext(struct tstate *ts)
1811 while (--ts->left >= 0) {
1812 struct tbl *p = *ts->next++;
1813 if (p != NULL && (p->flag & DEFINED))
1820 tnamecmp(const void *p1, const void *p2)
1822 const struct tbl *a = *((const struct tbl * const *)p1);
1823 const struct tbl *b = *((const struct tbl * const *)p2);
1825 return (strcmp(a->name, b->name));
1829 ktsort(struct table *tp)
1832 struct tbl **p, **sp, **dp;
1835 * since the table is never entirely full, no need to reserve
1836 * additional space for the trailing NULL appended below
1838 i = (size_t)1 << (tp->tshift);
1839 p = alloc2(i, sizeof(struct tbl *), ATEMP);
1840 sp = tp->tbls; /* source */
1843 if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) ||
1844 ((*dp)->flag & ARRAY)))
1846 qsort(p, (i = dp - p), sizeof(struct tbl *), tnamecmp);
1853 x_sigwinch(int sig MKSH_A_UNUSED)
1855 /* this runs inside interrupt context, with errno saved */
1863 DF(const char *fmt, ...)
1869 mksh_lockfd(shl_dbg_fd);
1871 timet2mjd(&mjd, tv.tv_sec);
1872 shf_fprintf(shl_dbg, "[%02u:%02u:%02u (%u) %u.%06u] ",
1873 (unsigned)mjd.sec / 3600, ((unsigned)mjd.sec / 60) % 60,
1874 (unsigned)mjd.sec % 60, (unsigned)getpid(),
1875 (unsigned)tv.tv_sec, (unsigned)tv.tv_usec);
1876 va_start(args, fmt);
1877 shf_vfprintf(shl_dbg, fmt, args);
1879 shf_putc('\n', shl_dbg);
1881 mksh_unlkfd(shl_dbg_fd);
1886 x_mkraw(int fd, mksh_ttyst *ocb, bool forread)
1891 mksh_tcget(fd, ocb);
1897 cb.c_iflag &= ~(ISTRIP);
1898 cb.c_lflag &= ~(ICANON) | ECHO;
1900 cb.c_iflag &= ~(INLCR | ICRNL | ISTRIP);
1901 cb.c_lflag &= ~(ISIG | ICANON | ECHO);
1903 #if defined(VLNEXT) && defined(_POSIX_VDISABLE)
1904 /* OSF/1 processes lnext when ~icanon */
1905 cb.c_cc[VLNEXT] = _POSIX_VDISABLE;
1907 /* SunOS 4.1.x & OSF/1 processes discard(flush) when ~icanon */
1908 #if defined(VDISCARD) && defined(_POSIX_VDISABLE)
1909 cb.c_cc[VDISCARD] = _POSIX_VDISABLE;
1914 mksh_tcset(fd, &cb);