source: trunk/src/kash/shinstance.c@ 2296

Last change on this file since 2296 was 2296, checked in by bird, 16 years ago

kash: avoid file steams in the trace code.
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1/* $Id: shinstance.c 2296 2009-03-01 01:54:30Z bird $ */
2/** @file
3 * The shell instance methods.
4 */
5
6/*
7 * Copyright (c) 2007-2009 knut st. osmundsen <bird-kBuild-spamix@anduin.net>
8 *
9 *
10 * This file is part of kBuild.
11 *
12 * kBuild is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * kBuild is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with kBuild; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 */
27
28/*******************************************************************************
29* Header Files *
30*******************************************************************************/
31#include <string.h>
32#include <stdlib.h>
33#include <assert.h>
34#ifdef _MSC_VER
35# include <process.h>
36#else
37# include <unistd.h>
38# include <pwd.h>
39#endif
40#if K_OS == K_OS_WINDOWS
41# include <Windows.h>
42#endif
43#include "shinstance.h"
44
45#if K_OS == K_OS_WINDOWS
46extern pid_t shfork_do_it(shinstance *psh); /* shforkA-win.asm */
47#endif
48
49
50/*******************************************************************************
51* Global Variables *
52*******************************************************************************/
53/** The mutex protecting the the globals and some shell instance members (sigs). */
54static shmtx g_sh_mtx;
55/** The root shell instance. */
56static shinstance *g_sh_root;
57/** The first shell instance. */
58static shinstance *g_sh_head;
59/** The last shell instance. */
60static shinstance *g_sh_tail;
61/** The number of shells. */
62static int volatile g_num_shells;
63/** Per signal state for determining a common denominator.
64 * @remarks defaults and unmasked actions aren't counted. */
65struct shsigstate
66{
67 /** The current signal action. */
68#ifndef _MSC_VER
69 struct sigaction sa;
70#else
71 struct
72 {
73 void (*sa_handler)(int);
74 int sa_flags;
75 shsigset_t sa_mask;
76 } sa;
77#endif
78 /** The number of restarts (siginterrupt / SA_RESTART). */
79 int num_restart;
80 /** The number of ignore handlers. */
81 int num_ignore;
82 /** The number of specific handlers. */
83 int num_specific;
84 /** The number of threads masking it. */
85 int num_masked;
86} g_sig_state[NSIG];
87
88
89
90int shmtx_init(shmtx *pmtx)
91{
92 pmtx->b[0] = 0;
93 return 0;
94}
95
96void shmtx_delete(shmtx *pmtx)
97{
98 pmtx->b[0] = 0;
99}
100
101void shmtx_enter(shmtx *pmtx, shmtxtmp *ptmp)
102{
103 pmtx->b[0] = 0;
104 ptmp->i = 0;
105}
106
107void shmtx_leave(shmtx *pmtx, shmtxtmp *ptmp)
108{
109 pmtx->b[0] = 0;
110 ptmp->i = 432;
111}
112
113/**
114 * Links the shell instance.
115 *
116 * @param psh The shell.
117 */
118static void sh_int_link(shinstance *psh)
119{
120 shmtxtmp tmp;
121 shmtx_enter(&g_sh_mtx, &tmp);
122
123 if (psh->rootshell)
124 g_sh_root = psh;
125
126 psh->next = NULL;
127 psh->prev = g_sh_tail;
128 if (g_sh_tail)
129 g_sh_tail->next = psh;
130 else
131 g_sh_tail = g_sh_head = psh;
132 g_sh_tail = psh;
133
134 g_num_shells++;
135
136 shmtx_leave(&g_sh_mtx, &tmp);
137}
138
139#if 0
140/**
141 * Unlink the shell instance.
142 *
143 * @param psh The shell.
144 */
145static void sh_int_unlink(shinstance *psh)
146{
147 shmtxtmp tmp;
148 shmtx_enter(&g_sh_mtx, &tmp);
149
150 g_num_shells--;
151
152 if (g_sh_tail == psh)
153 g_sh_tail = psh->prev;
154 else
155 psh->next->prev = psh->prev;
156
157 if (g_sh_head == psh)
158 g_sh_head = psh->next;
159 else
160 psh->prev->next = psh->next;
161
162 if (g_sh_root == psh)
163 g_sh_root = 0;
164
165 shmtx_leave(&g_sh_mtx, &tmp);
166}
167#endif
168
169/**
170 * Destroys the shell instance.
171 *
172 * This will work on partially initialized instances (because I'm lazy).
173 *
174 * @param psh The shell instance to be destroyed.
175 */
176static void sh_destroy(shinstance *psh)
177{
178 memset(psh, 0, sizeof(*psh));
179 sh_free(NULL, psh);
180}
181
182/**
183 * Clones a string vector like enviorn or argv.
184 *
185 * @returns 0 on success, -1 and errno on failure.
186 * @param psh The shell to associate the allocations with.
187 * @param dstp Where to store the clone.
188 * @param src The vector to be cloned.
189 */
190static int sh_clone_string_vector(shinstance *psh, char ***dstp, char **src)
191{
192 char **dst;
193 size_t items;
194
195 /* count first */
196 items = 0;
197 while (src[items])
198 items++;
199
200 /* alloc clone array. */
201 *dstp = dst = sh_malloc(psh, sizeof(*dst) * items + 1);
202 if (!dst)
203 return -1;
204
205 /* copy the items */
206 dst[items] = NULL;
207 while (items-- > 0)
208 {
209 dst[items] = sh_strdup(psh, src[items]);
210 if (!dst[items])
211 {
212 /* allocation error, clean up. */
213 while (dst[++items])
214 sh_free(psh, dst[items]);
215 sh_free(psh, dst);
216 errno = ENOMEM;
217 return -1;
218 }
219 }
220
221 return 0;
222}
223
224/**
225 * Creates a root shell instance.
226 *
227 * @param inherit The shell to inherit from. If NULL inherit from environment and such.
228 * @param argc The argument count.
229 * @param argv The argument vector.
230 * @param envp The environment vector.
231 *
232 * @returns pointer to root shell on success, NULL on failure.
233 */
234shinstance *sh_create_root_shell(shinstance *inherit, int argc, char **argv, char **envp)
235{
236 shinstance *psh;
237 int i;
238
239 /*
240 * The allocations.
241 */
242 psh = sh_calloc(NULL, sizeof(*psh), 1);
243 if (psh)
244 {
245 /* Init it enought for sh_destroy() to not get upset */
246 /* ... */
247
248 /* Call the basic initializers. */
249 if ( !sh_clone_string_vector(psh, &psh->shenviron, envp)
250 && !sh_clone_string_vector(psh, &psh->argptr, argv)
251 && !shfile_init(&psh->fdtab, inherit ? &inherit->fdtab : NULL))
252 {
253 /* the special stuff. */
254#ifdef _MSC_VER
255 psh->pid = _getpid();
256#else
257 psh->pid = getpid();
258#endif
259 /*sh_sigemptyset(&psh->sigrestartset);*/
260 for (i = 0; i < NSIG; i++)
261 psh->sigactions[i].sh_handler = SH_SIG_UNK;
262 if (inherit)
263 psh->sigmask = psh->sigmask;
264 else
265 {
266#if defined(SH_PURE_STUB_MODE) || defined(_MSC_VER)
267 sh_sigemptyset(&psh->sigmask);
268#else
269 sigprocmask(SIG_SETMASK, NULL, &psh->sigmask);
270#endif
271 }
272
273 /* memalloc.c */
274 psh->stacknleft = MINSIZE;
275 psh->herefd = -1;
276 psh->stackp = &psh->stackbase;
277 psh->stacknxt = psh->stackbase.space;
278
279 /* input.c */
280 psh->plinno = 1;
281 psh->init_editline = 0;
282 psh->parsefile = &psh->basepf;
283
284 /* output.c */
285 psh->output.bufsize = OUTBUFSIZ;
286 psh->output.fd = 1;
287 psh->output.psh = psh;
288 psh->errout.bufsize = 100;
289 psh->errout.fd = 2;
290 psh->errout.psh = psh;
291 psh->memout.fd = MEM_OUT;
292 psh->memout.psh = psh;
293 psh->out1 = &psh->output;
294 psh->out2 = &psh->errout;
295
296 /* jobs.c */
297 psh->backgndpid = -1;
298#if JOBS
299 psh->curjob = -1;
300#else
301# error asdf
302#endif
303 psh->ttyfd = -1;
304
305 /* show.c */
306 psh->tracefd = -1;
307
308 /* link it. */
309 sh_int_link(psh);
310 return psh;
311 }
312
313 sh_destroy(psh);
314 }
315 return NULL;
316}
317
318/** getenv() */
319char *sh_getenv(shinstance *psh, const char *var)
320{
321 size_t len;
322 int i = 0;
323
324 if (!var)
325 return NULL;
326
327 len = strlen(var);
328 i = 0;
329 while (psh->shenviron[i])
330 {
331 const char *item = psh->shenviron[i];
332 if ( !strncmp(item, var, len)
333 && item[len] == '=')
334 return (char *)item + len + 1;
335 }
336
337 return NULL;
338}
339
340char **sh_environ(shinstance *psh)
341{
342 return psh->shenviron;
343}
344
345const char *sh_gethomedir(shinstance *psh, const char *user)
346{
347 const char *ret = NULL;
348
349#ifdef _MSC_VER
350 ret = sh_getenv(psh, "HOME");
351 if (!ret)
352 ret = sh_getenv(psh, "USERPROFILE");
353#else
354 struct passwd *pwd = getpwnam(user); /** @todo use getpwdnam_r */
355 (void)psh;
356 ret = pwd ? pwd->pw_dir : NULL;
357#endif
358
359 return ret;
360}
361
362/**
363 * Lazy initialization of a signal state, globally.
364 *
365 * @param psh The shell doing the lazy work.
366 * @param signo The signal (valid).
367 */
368static void sh_int_lazy_init_sigaction(shinstance *psh, int signo)
369{
370 if (psh->sigactions[signo].sh_handler == SH_SIG_UNK)
371 {
372 shmtxtmp tmp;
373 shmtx_enter(&g_sh_mtx, &tmp);
374
375 if (psh->sigactions[signo].sh_handler == SH_SIG_UNK)
376 {
377 shsigaction_t shold;
378 shinstance *cur;
379#ifndef _MSC_VER
380 struct sigaction old;
381 if (!sigaction(signo, NULL, &old))
382 {
383 /* convert */
384 shold.sh_flags = old.sa_flags;
385 shold.sh_mask = old.sa_mask;
386 if (old.sa_handler == SIG_DFL)
387 shold.sh_handler = SH_SIG_DFL;
388 else
389 {
390 assert(old.sa_handler == SIG_IGN);
391 shold.sh_handler = SH_SIG_IGN;
392 }
393 }
394 else
395#endif
396 {
397 /* fake */
398#ifndef _MSC_VER
399 assert(0);
400 old.sa_handler = SIG_DFL;
401 old.sa_flags = 0;
402 sigemptyset(&shold.sh_mask);
403 sigaddset(&shold.sh_mask, signo);
404#endif
405 shold.sh_flags = 0;
406 sh_sigemptyset(&shold.sh_mask);
407 sh_sigaddset(&shold.sh_mask, signo);
408 shold.sh_handler = SH_SIG_DFL;
409 }
410
411 /* update globals */
412#ifndef _MSC_VER
413 g_sig_state[signo].sa = old;
414#else
415 g_sig_state[signo].sa.sa_handler = SIG_DFL;
416 g_sig_state[signo].sa.sa_flags = 0;
417 g_sig_state[signo].sa.sa_mask = shold.sh_mask;
418#endif
419 TRACE2((psh, "sh_int_lazy_init_sigaction: signo=%d:%s sa_handler=%p sa_flags=%#x\n",
420 signo, sys_signame[signo], g_sig_state[signo].sa.sa_handler, g_sig_state[signo].sa.sa_flags));
421
422 /* update all shells */
423 for (cur = g_sh_head; cur; cur = cur->next)
424 {
425 assert(cur->sigactions[signo].sh_handler == SH_SIG_UNK);
426 cur->sigactions[signo] = shold;
427 }
428 }
429
430 shmtx_leave(&g_sh_mtx, &tmp);
431 }
432}
433
434/**
435 * Perform the default signal action on the shell.
436 *
437 * @param psh The shell instance.
438 * @param signo The signal.
439 */
440static void sh_sig_do_default(shinstance *psh, int signo)
441{
442 /** @todo */
443}
444
445/**
446 * Deliver a signal to a shell.
447 *
448 * @param psh The shell instance.
449 * @param pshDst The shell instance to signal.
450 * @param signo The signal.
451 * @param locked Whether we're owning the lock or not.
452 */
453static void sh_sig_do_signal(shinstance *psh, shinstance *pshDst, int signo, int locked)
454{
455 shsig_t pfn = pshDst->sigactions[signo].sh_handler;
456 if (pfn == SH_SIG_UNK)
457 {
458 sh_int_lazy_init_sigaction(pshDst, signo);
459 pfn = pshDst->sigactions[signo].sh_handler;
460 }
461
462 if (pfn == SH_SIG_DFL)
463 sh_sig_do_default(pshDst, signo);
464 else if (pfn == SH_SIG_IGN)
465 /* ignore it */;
466 else
467 {
468 assert(pfn != SH_SIG_ERR);
469 pfn(pshDst, signo);
470 }
471 (void)locked;
472}
473
474/**
475 * Handler for external signals.
476 *
477 * @param signo The signal.
478 */
479static void sh_sig_common_handler(int signo)
480{
481 shinstance *psh;
482
483 fprintf(stderr, "sh_sig_common_handler: signo=%d:%s\n", signo, sys_signame[signo]);
484
485 /*
486 * No need to take locks if there is only one shell.
487 * Since this will be the initial case, just avoid the deadlock
488 * hell for a litte while...
489 */
490 if (g_num_shells <= 1)
491 {
492 psh = g_sh_head;
493 if (psh)
494 sh_sig_do_signal(NULL, psh, signo, 0 /* no lock */);
495 }
496 else
497 {
498 shmtxtmp tmp;
499 shmtx_enter(&g_sh_mtx, &tmp);
500
501 /** @todo signal focus chain or something? Atm there will only be one shell,
502 * so it's not really important until we go threaded for real... */
503 psh = g_sh_tail;
504 while (psh != NULL)
505 {
506 sh_sig_do_signal(NULL, psh, signo, 1 /* locked */);
507 psh = psh->prev;
508 }
509
510 shmtx_leave(&g_sh_mtx, &tmp);
511 }
512}
513
514int sh_sigaction(shinstance *psh, int signo, const struct shsigaction *newp, struct shsigaction *oldp)
515{
516 if (newp)
517 TRACE2((psh, "sh_sigaction: signo=%d:%s newp=%p:{.sh_handler=%p, .sh_flags=%#x} oldp=%p\n",
518 signo, sys_signame[signo], newp, newp->sh_handler, newp->sh_flags, oldp));
519 else
520 TRACE2((psh, "sh_sigaction: signo=%d:%s newp=NULL oldp=%p\n", signo, sys_signame[signo], oldp));
521
522 /*
523 * Input validation.
524 */
525 if (signo >= NSIG || signo <= 0)
526 {
527 errno = EINVAL;
528 return -1;
529 }
530
531#ifdef SH_PURE_STUB_MODE
532 return -1;
533#else
534
535 /*
536 * Make sure our data is correct.
537 */
538 sh_int_lazy_init_sigaction(psh, signo);
539
540 /*
541 * Get the old one if requested.
542 */
543 if (oldp)
544 *oldp = psh->sigactions[signo];
545
546 /*
547 * Set the new one if it has changed.
548 *
549 * This will be attempted coordinated with the other signal handlers so
550 * that we can arrive at a common denominator.
551 */
552 if ( newp
553 && memcmp(&psh->sigactions[signo], newp, sizeof(*newp)))
554 {
555 shmtxtmp tmp;
556 shmtx_enter(&g_sh_mtx, &tmp);
557
558 /* Undo the accounting for the current entry. */
559 if (psh->sigactions[signo].sh_handler == SH_SIG_IGN)
560 g_sig_state[signo].num_ignore--;
561 else if (psh->sigactions[signo].sh_handler != SH_SIG_DFL)
562 g_sig_state[signo].num_specific--;
563 if (psh->sigactions[signo].sh_flags & SA_RESTART)
564 g_sig_state[signo].num_restart--;
565
566 /* Set the new entry. */
567 psh->sigactions[signo] = *newp;
568
569 /* Add the bits for the new action entry. */
570 if (psh->sigactions[signo].sh_handler == SH_SIG_IGN)
571 g_sig_state[signo].num_ignore++;
572 else if (psh->sigactions[signo].sh_handler != SH_SIG_DFL)
573 g_sig_state[signo].num_specific++;
574 if (psh->sigactions[signo].sh_flags & SA_RESTART)
575 g_sig_state[signo].num_restart++;
576
577 /*
578 * Calc new common action.
579 *
580 * This is quit a bit ASSUMPTIVE about the limited use. We will not
581 * bother synching the mask, and we pretend to care about SA_RESTART.
582 * The only thing we really actually care about is the sh_handler.
583 *
584 * On second though, it's possible we should just tie this to the root
585 * shell since it only really applies to external signal ...
586 */
587 if ( g_sig_state[signo].num_specific
588 || g_sig_state[signo].num_ignore != g_num_shells)
589 g_sig_state[signo].sa.sa_handler = sh_sig_common_handler;
590 else if (g_sig_state[signo].num_ignore)
591 g_sig_state[signo].sa.sa_handler = SIG_IGN;
592 else
593 g_sig_state[signo].sa.sa_handler = SIG_DFL;
594 g_sig_state[signo].sa.sa_flags = psh->sigactions[signo].sh_flags & SA_RESTART;
595
596 TRACE2((psh, "sh_sigaction: setting signo=%d:%s to {.sa_handler=%p, .sa_flags=%#x}\n",
597 signo, sys_signame[signo], g_sig_state[signo].sa.sa_handler, g_sig_state[signo].sa.sa_flags));
598# ifdef _MSC_VER
599 if (signal(signo, g_sig_state[signo].sa.sa_handler) == SIG_ERR)
600# else
601 if (sigaction(signo, &g_sig_state[signo].sa, NULL))
602# endif
603 assert(0);
604
605 shmtx_leave(&g_sh_mtx, &tmp);
606 }
607
608 return 0;
609#endif
610}
611
612shsig_t sh_signal(shinstance *psh, int signo, shsig_t handler)
613{
614 shsigaction_t sa;
615 shsig_t ret;
616
617 /*
618 * Implementation using sh_sigaction.
619 */
620 if (sh_sigaction(psh, signo, NULL, &sa))
621 return SH_SIG_ERR;
622
623 ret = sa.sh_handler;
624 sa.sh_flags &= SA_RESTART;
625 sa.sh_handler = handler;
626 sh_sigemptyset(&sa.sh_mask);
627 sh_sigaddset(&sa.sh_mask, signo); /* ?? */
628 if (sh_sigaction(psh, signo, &sa, NULL))
629 return SH_SIG_ERR;
630
631 return ret;
632}
633
634int sh_siginterrupt(shinstance *psh, int signo, int interrupt)
635{
636 shsigaction_t sa;
637 int oldflags = 0;
638
639 /*
640 * Implementation using sh_sigaction.
641 */
642 if (sh_sigaction(psh, signo, NULL, &sa))
643 return -1;
644 oldflags = sa.sh_flags;
645 if (interrupt)
646 sa.sh_flags &= ~SA_RESTART;
647 else
648 sa.sh_flags |= ~SA_RESTART;
649 if (!((oldflags ^ sa.sh_flags) & SA_RESTART))
650 return 0; /* unchanged. */
651
652 return sh_sigaction(psh, signo, &sa, NULL);
653}
654
655void sh_sigemptyset(shsigset_t *setp)
656{
657 memset(setp, 0, sizeof(*setp));
658}
659
660void sh_sigfillset(shsigset_t *setp)
661{
662 memset(setp, 0xff, sizeof(*setp));
663}
664
665void sh_sigaddset(shsigset_t *setp, int signo)
666{
667#ifdef _MSC_VER
668 *setp |= 1U << signo;
669#else
670 sigaddset(setp, signo);
671#endif
672}
673
674void sh_sigdelset(shsigset_t *setp, int signo)
675{
676#ifdef _MSC_VER
677 *setp &= ~(1U << signo);
678#else
679 sigdelset(setp, signo);
680#endif
681}
682
683int sh_sigismember(shsigset_t const *setp, int signo)
684{
685#ifdef _MSC_VER
686 return !!(*setp & (1U << signo));
687#else
688 return !!sigismember(setp, signo);
689#endif
690}
691
692int sh_sigprocmask(shinstance *psh, int operation, shsigset_t const *newp, shsigset_t *oldp)
693{
694 int rc;
695
696 if ( operation != SIG_BLOCK
697 && operation != SIG_UNBLOCK
698 && operation != SIG_SETMASK)
699 {
700 errno = EINVAL;
701 return -1;
702 }
703
704#if (defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)) && !defined(_MSC_VER)
705 rc = sigprocmask(operation, newp, oldp);
706 if (!rc && newp)
707 psh->sigmask = *newp;
708
709#else
710 if (oldp)
711 *oldp = psh->sigmask;
712 if (newp)
713 {
714 /* calc the new mask */
715 shsigset_t mask = psh->sigmask;
716 switch (operation)
717 {
718 case SIG_BLOCK:
719 for (rc = 0; rc < NSIG; rc++)
720 if (sh_sigismember(newp, rc))
721 sh_sigaddset(&mask, rc);
722 break;
723 case SIG_UNBLOCK:
724 for (rc = 0; rc < NSIG; rc++)
725 if (sh_sigismember(newp, rc))
726 sh_sigdelset(&mask, rc);
727 break;
728 case SIG_SETMASK:
729 mask = *newp;
730 break;
731 }
732
733# if defined(SH_STUB_MODE) || defined(_MSC_VER)
734 rc = 0;
735# else
736 rc = sigprocmask(operation, &mask, NULL);
737 if (!rc)
738# endif
739 psh->sigmask = mask;
740 }
741
742#endif
743 return rc;
744}
745
746void sh_abort(shinstance *psh)
747{
748 shsigset_t set;
749 TRACE2((psh, "sh_abort\n"));
750
751 /* block other async signals */
752 sh_sigfillset(&set);
753 sh_sigdelset(&set, SIGABRT);
754 sh_sigprocmask(psh, SIG_SETMASK, &set, NULL);
755
756 sh_sig_do_signal(psh, psh, SIGABRT, 0 /* no lock */);
757
758 /** @todo die in a nicer manner. */
759 *(char *)1 = 3;
760
761 TRACE2((psh, "sh_abort returns!\n"));
762 (void)psh;
763 abort();
764}
765
766void sh_raise_sigint(shinstance *psh)
767{
768 TRACE2((psh, "sh_raise(SIGINT)\n"));
769
770 sh_sig_do_signal(psh, psh, SIGINT, 0 /* no lock */);
771
772 TRACE2((psh, "sh_raise(SIGINT) returns\n"));
773}
774
775int sh_kill(shinstance *psh, pid_t pid, int signo)
776{
777 shinstance *pshDst;
778 shmtxtmp tmp;
779 int rc;
780
781 /*
782 * Self or any of the subshells?
783 */
784 shmtx_enter(&g_sh_mtx, &tmp);
785
786 pshDst = g_sh_tail;
787 while (pshDst != NULL)
788 {
789 if (pshDst->pid == pid)
790 {
791 TRACE2((psh, "sh_kill(%d, %d): pshDst=%p\n", pid, signo, pshDst));
792 sh_sig_do_signal(psh, pshDst, signo, 1 /* locked */);
793
794 shmtx_leave(&g_sh_mtx, &tmp);
795 return 0;
796 }
797 pshDst = pshDst->prev;
798 }
799
800 shmtx_leave(&g_sh_mtx, &tmp);
801
802 /*
803 * Some other process, call kill where possible
804 */
805#ifdef SH_PURE_STUB_MODE
806 rc = -1;
807
808#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
809# ifdef _MSC_VER
810 errno = ENOSYS;
811 rc = -1;
812# else
813 fprintf(stderr, "kill(%d, %d)\n", pid, signo);
814 rc = kill(pid, signo);
815# endif
816
817#else
818#endif
819
820 TRACE2((psh, "sh_kill(%d, %d) -> %d [%d]\n", pid, signo, rc, errno));
821 return rc;
822}
823
824int sh_killpg(shinstance *psh, pid_t pgid, int signo)
825{
826 int rc;
827
828#ifdef SH_PURE_STUB_MODE
829 rc = -1;
830
831#elif defined(SH_STUB_MODE)
832# ifdef _MSC_VER
833 errno = ENOSYS;
834 rc = -1;
835# else
836 //fprintf(stderr, "killpg(%d, %d)\n", pgid, signo);
837 rc = killpg(pgid, signo);
838# endif
839
840#else
841#endif
842
843 TRACE2((psh, "sh_killpg(%d, %d) -> %d [%d]\n", pgid, signo, rc, errno));
844 (void)psh;
845 return rc;
846}
847
848clock_t sh_times(shinstance *psh, shtms *tmsp)
849{
850#ifdef SH_PURE_STUB_MODE
851 return 0;
852
853#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
854 (void)psh;
855# ifdef _MSC_VER
856 errno = ENOSYS;
857 return (clock_t)-1;
858# else
859 return times(tmsp);
860# endif
861
862#else
863#endif
864}
865
866int sh_sysconf_clk_tck(void)
867{
868#ifdef SH_PURE_STUB_MODE
869 return 1;
870#else
871# ifdef _MSC_VER
872 return CLK_TCK;
873# else
874 return sysconf(_SC_CLK_TCK);
875# endif
876#endif
877}
878
879/**
880 * Adds a child to the shell
881 *
882 * @returns 0 on success, on failure -1 and errno set to ENOMEM.
883 *
884 * @param psh The shell instance.
885 * @param pid The child pid.
886 * @param hChild Windows child handle.
887 */
888int sh_add_child(shinstance *psh, pid_t pid, void *hChild)
889{
890 /* get a free table entry. */
891 int i = psh->num_children++;
892 if (!(i % 32))
893 {
894 void *ptr = sh_realloc(psh, psh->children, sizeof(*psh->children) * (i + 32));
895 if (!ptr)
896 {
897 psh->num_children--;
898 errno = ENOMEM;
899 return -1;
900 }
901 psh->children = ptr;
902 }
903
904 /* add it */
905 psh->children[i].pid = pid;
906#if K_OS == K_OS_WINDOWS
907 psh->children[i].hChild = hChild;
908#endif
909 (void)hChild;
910 return 0;
911}
912
913pid_t sh_fork(shinstance *psh)
914{
915 pid_t pid;
916 TRACE2((psh, "sh_fork\n"));
917
918#ifdef SH_PURE_STUB_MODE
919 pid = -1;
920
921#elif K_OS == K_OS_WINDOWS //&& defined(SH_FORKED_MODE)
922 pid = shfork_do_it(psh);
923# ifdef DEBUG
924 if (!pid)
925 opentrace(psh);
926# endif
927
928#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
929# ifdef _MSC_VER
930 pid = -1;
931 errno = ENOSYS;
932# else
933 pid = fork();
934# endif
935
936#else
937
938#endif
939
940 /* child: update the pid */
941 if (!pid)
942# ifdef _MSC_VER
943 psh->pid = _getpid();
944# else
945 psh->pid = getpid();
946# endif
947
948 TRACE2((psh, "sh_fork -> %d [%d]\n", pid, errno));
949 (void)psh;
950 return pid;
951}
952
953/** waitpid() */
954pid_t sh_waitpid(shinstance *psh, pid_t pid, int *statusp, int flags)
955{
956 pid_t pidret;
957#ifdef SH_PURE_STUB_MODE
958 *statusp = 0;
959 pidret = -1;
960
961#elif K_OS == K_OS_WINDOWS //&& defined(SH_FORKED_MODE)
962 DWORD dwRet;
963 HANDLE hChild = INVALID_HANDLE_VALUE;
964 int i;
965
966 *statusp = 0;
967 pidret = -1;
968 if (pid != -1)
969 {
970 /*
971 * A specific child, try look it up in the child process table
972 * and wait for it.
973 */
974 for (i = 0; i < psh->num_children; i++)
975 if (psh->children[i].pid == pid)
976 break;
977 if (i < psh->num_children)
978 {
979 dwRet = WaitForSingleObject(psh->children[i].hChild,
980 flags & WNOHANG ? 0 : INFINITE);
981 if (dwRet == WAIT_OBJECT_0)
982 hChild = psh->children[i].hChild;
983 else if (dwRet == WAIT_TIMEOUT)
984 {
985 i = -1; /* don't try close anything */
986 pidret = 0;
987 }
988 else
989 errno = ECHILD;
990 }
991 else
992 errno = ECHILD;
993 }
994 else if (psh->num_children <= MAXIMUM_WAIT_OBJECTS)
995 {
996 HANDLE ahChildren[64];
997 for (i = 0; i < psh->num_children; i++)
998 ahChildren[i] = psh->children[i].hChild;
999 dwRet = WaitForMultipleObjects(psh->num_children, &ahChildren[0],
1000 FALSE,
1001 flags & WNOHANG ? 0 : INFINITE);
1002 i = dwRet - WAIT_OBJECT_0;
1003 if ((unsigned)i < (unsigned)psh->num_children)
1004 {
1005 hChild = psh->children[i].hChild;
1006 }
1007 else if (dwRet == WAIT_TIMEOUT)
1008 {
1009 i = -1; /* don't try close anything */
1010 pidret = 0;
1011 }
1012 else
1013 {
1014 i = -1; /* don't try close anything */
1015 errno = EINVAL;
1016 }
1017 }
1018 else
1019 {
1020 fprintf(stderr, "panic! too many children!\n");
1021 i = -1;
1022 *(char *)1 = '\0'; /** @todo implement this! */
1023 }
1024
1025 /*
1026 * Close the handle, and if we succeeded collect the exit code first.
1027 */
1028 if ( i >= 0
1029 && i < psh->num_children)
1030 {
1031 if (hChild != INVALID_HANDLE_VALUE)
1032 {
1033 DWORD dwExitCode = 127;
1034 if (GetExitCodeProcess(hChild, &dwExitCode))
1035 {
1036 pidret = psh->children[i].pid;
1037 if (dwExitCode && !W_EXITCODE(dwExitCode, 0))
1038 dwExitCode |= 16;
1039 *statusp = W_EXITCODE(dwExitCode, 0);
1040 }
1041 else
1042 errno = EINVAL;
1043 }
1044
1045 /* remove and close */
1046 hChild = psh->children[i].hChild;
1047 psh->num_children--;
1048 if (i < psh->num_children)
1049 psh->children[i] = psh->children[psh->num_children];
1050 i = CloseHandle(hChild); assert(i);
1051 }
1052
1053#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1054 *statusp = 0;
1055# ifdef _MSC_VER
1056 pidret = -1;
1057 errno = ENOSYS;
1058# else
1059 pidret = waitpid(pid, statusp, flags);
1060# endif
1061
1062#else
1063#endif
1064
1065 TRACE2((psh, "waitpid(%d, %p, %#x) -> %d [%d] *statusp=%#x (rc=%d)\n", pid, statusp, flags,
1066 pidret, errno, *statusp, WEXITSTATUS(*statusp)));
1067 (void)psh;
1068 return pidret;
1069}
1070
1071void sh__exit(shinstance *psh, int rc)
1072{
1073 TRACE2((psh, "sh__exit(%d)\n", rc));
1074 (void)psh;
1075
1076#ifdef SH_PURE_STUB_MODE
1077 return -1;
1078
1079#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1080 _exit(rc);
1081
1082#else
1083#endif
1084}
1085
1086int sh_execve(shinstance *psh, const char *exe, const char * const *argv, const char * const *envp)
1087{
1088#ifdef _MSC_VER
1089 intptr_t rc;
1090#else
1091 int rc;
1092#endif
1093
1094#ifdef DEBUG
1095 /* log it all */
1096 TRACE2((psh, "sh_execve(%p:{%s}, %p, %p}\n", exe, exe, argv, envp));
1097 for (rc = 0; argv[rc]; rc++)
1098 TRACE2((psh, " argv[%d]=%p:{%s}\n", rc, argv[rc], argv[rc]));
1099#endif
1100
1101 if (!envp)
1102 envp = sh_environ(psh);
1103
1104#ifdef SH_PURE_STUB_MODE
1105 rc = -1;
1106
1107#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1108# ifdef _MSC_VER
1109 rc = _spawnve(_P_WAIT, exe, (char **)argv, (char **)envp);
1110# else
1111 rc = execve(exe, (char **)argv, (char **)envp);
1112# endif
1113
1114#else
1115#endif
1116
1117 TRACE2((psh, "sh_execve -> %d [%d]\n", rc, errno));
1118 (void)psh;
1119 return (int)rc;
1120}
1121
1122uid_t sh_getuid(shinstance *psh)
1123{
1124#ifdef SH_PURE_STUB_MODE
1125 uid_t uid = 0;
1126
1127#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1128# ifdef _MSC_VER
1129 uid_t uid = 0;
1130# else
1131 uid_t uid = getuid();
1132# endif
1133
1134#else
1135#endif
1136
1137 TRACE2((psh, "sh_getuid() -> %d [%d]\n", uid, errno));
1138 (void)psh;
1139 return uid;
1140}
1141
1142uid_t sh_geteuid(shinstance *psh)
1143{
1144#ifdef SH_PURE_STUB_MODE
1145 uid_t euid = 0;
1146
1147#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1148# ifdef _MSC_VER
1149 uid_t euid = 0;
1150# else
1151 uid_t euid = geteuid();
1152# endif
1153
1154#else
1155#endif
1156
1157 TRACE2((psh, "sh_geteuid() -> %d [%d]\n", euid, errno));
1158 (void)psh;
1159 return euid;
1160}
1161
1162gid_t sh_getgid(shinstance *psh)
1163{
1164#ifdef SH_PURE_STUB_MODE
1165 gid_t gid = 0;
1166
1167#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1168# ifdef _MSC_VER
1169 gid_t gid = 0;
1170# else
1171 gid_t gid = getgid();
1172# endif
1173
1174#else
1175#endif
1176
1177 TRACE2((psh, "sh_getgid() -> %d [%d]\n", gid, errno));
1178 (void)psh;
1179 return gid;
1180}
1181
1182gid_t sh_getegid(shinstance *psh)
1183{
1184#ifdef SH_PURE_STUB_MODE
1185 gid_t egid = 0;
1186
1187#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1188# ifdef _MSC_VER
1189 gid_t egid = 0;
1190# else
1191 gid_t egid = getegid();
1192# endif
1193
1194#else
1195#endif
1196
1197 TRACE2((psh, "sh_getegid() -> %d [%d]\n", egid, errno));
1198 (void)psh;
1199 return egid;
1200}
1201
1202pid_t sh_getpid(shinstance *psh)
1203{
1204 pid_t pid;
1205
1206#ifdef SH_PURE_STUB_MODE
1207 pid = 0;
1208
1209#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1210# ifdef _MSC_VER
1211 pid = _getpid();
1212# else
1213 pid = getpid();
1214# endif
1215#else
1216#endif
1217
1218 (void)psh;
1219 return pid;
1220}
1221
1222pid_t sh_getpgrp(shinstance *psh)
1223{
1224#ifdef SH_PURE_STUB_MODE
1225 pid_t pgrp = 0;
1226
1227#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1228# ifdef _MSC_VER
1229 pid_t pgrp = _getpid();
1230# else
1231 pid_t pgrp = getpgrp();
1232# endif
1233
1234#else
1235#endif
1236
1237 TRACE2((psh, "sh_getpgrp() -> %d [%d]\n", pgrp, errno));
1238 (void)psh;
1239 return pgrp;
1240}
1241
1242pid_t sh_getpgid(shinstance *psh, pid_t pid)
1243{
1244#ifdef SH_PURE_STUB_MODE
1245 pid_t pgid = pid;
1246
1247#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1248# ifdef _MSC_VER
1249 pid_t pgid = pid;
1250# else
1251 pid_t pgid = getpgid(pid);
1252# endif
1253
1254#else
1255#endif
1256
1257 TRACE2((psh, "sh_getpgid(%d) -> %d [%d]\n", pid, pgid, errno));
1258 (void)psh;
1259 return pgid;
1260}
1261
1262int sh_setpgid(shinstance *psh, pid_t pid, pid_t pgid)
1263{
1264#ifdef SH_PURE_STUB_MODE
1265 int rc = -1;
1266
1267#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1268# ifdef _MSC_VER
1269 int rc = -1;
1270 errno = ENOSYS;
1271# else
1272 int rc = setpgid(pid, pgid);
1273# endif
1274
1275#else
1276#endif
1277
1278 TRACE2((psh, "sh_setpgid(%d, %d) -> %d [%d]\n", pid, pgid, rc, errno));
1279 (void)psh;
1280 return rc;
1281}
1282
1283pid_t sh_tcgetpgrp(shinstance *psh, int fd)
1284{
1285 pid_t pgrp;
1286
1287#ifdef SH_PURE_STUB_MODE
1288 pgrp = -1;
1289
1290#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1291# ifdef _MSC_VER
1292 pgrp = -1;
1293 errno = ENOSYS;
1294# else
1295 pgrp = tcgetpgrp(fd);
1296# endif
1297
1298#else
1299#endif
1300
1301 TRACE2((psh, "sh_tcgetpgrp(%d) -> %d [%d]\n", fd, pgrp, errno));
1302 (void)psh;
1303 return pgrp;
1304}
1305
1306int sh_tcsetpgrp(shinstance *psh, int fd, pid_t pgrp)
1307{
1308 int rc;
1309 TRACE2((psh, "sh_tcsetpgrp(%d, %d)\n", fd, pgrp));
1310
1311#ifdef SH_PURE_STUB_MODE
1312 rc = -1;
1313
1314#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1315# ifdef _MSC_VER
1316 rc = -1;
1317 errno = ENOSYS;
1318# else
1319 rc = tcsetpgrp(fd, pgrp);
1320# endif
1321
1322#else
1323#endif
1324
1325 TRACE2((psh, "sh_tcsetpgrp(%d, %d) -> %d [%d]\n", fd, pgrp, rc, errno));
1326 (void)psh;
1327 return rc;
1328}
1329
1330int sh_getrlimit(shinstance *psh, int resid, shrlimit *limp)
1331{
1332#ifdef SH_PURE_STUB_MODE
1333 int rc = -1;
1334
1335#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1336# ifdef _MSC_VER
1337 int rc = -1;
1338 errno = ENOSYS;
1339# else
1340 int rc = getrlimit(resid, limp);
1341# endif
1342
1343#else
1344 /* returned the stored limit */
1345#endif
1346
1347 TRACE2((psh, "sh_getrlimit(%d, %p) -> %d [%d] {%ld,%ld}\n",
1348 resid, limp, rc, errno, (long)limp->rlim_cur, (long)limp->rlim_max));
1349 (void)psh;
1350 return rc;
1351}
1352
1353int sh_setrlimit(shinstance *psh, int resid, const shrlimit *limp)
1354{
1355#ifdef SH_PURE_STUB_MODE
1356 int rc = -1;
1357
1358#elif defined(SH_STUB_MODE) || defined(SH_FORKED_MODE)
1359# ifdef _MSC_VER
1360 int rc = -1;
1361 errno = ENOSYS;
1362# else
1363 int rc = setrlimit(resid, limp);
1364# endif
1365
1366#else
1367 /* if max(shell) < limp; then setrlimit; fi
1368 if success; then store limit for later retrival and maxing. */
1369
1370#endif
1371
1372 TRACE2((psh, "sh_setrlimit(%d, %p:{%ld,%ld}) -> %d [%d]\n",
1373 resid, limp, (long)limp->rlim_cur, (long)limp->rlim_max, rc, errno));
1374 (void)psh;
1375 return rc;
1376}
1377
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