00001
00005 #include "system.h"
00006
00007 #if defined(__LCLINT__)
00008 #define _BITS_SIGTHREAD_H
00009
00010
00011
00012
00013 extern int sighold(int sig)
00014 ;
00015 extern int sigignore(int sig)
00016 ;
00017 extern int sigpause(int sig)
00018 ;
00019 extern int sigrelse(int sig)
00020 ;
00021 extern void (*sigset(int sig, void (*disp)(int)))(int)
00022 ;
00023
00024 struct qelem;
00025 extern void insque(struct qelem * __elem, struct qelem * __prev)
00026 ;
00027 extern void remque(struct qelem * __elem)
00028 ;
00029
00030 extern pthread_t pthread_self(void)
00031 ;
00032 extern int pthread_equal(pthread_t t1, pthread_t t2)
00033 ;
00034
00035 extern int pthread_create( pthread_t *restrict thread,
00036 const pthread_attr_t *restrict attr,
00037 void *(*start_routine)(void*), void *restrict arg)
00038 ;
00039 extern int pthread_join(pthread_t thread, void **value_ptr)
00040 ;
00041
00042 extern int pthread_setcancelstate(int state, int *oldstate)
00043
00044 ;
00045 extern int pthread_setcanceltype(int type, int *oldtype)
00046
00047 ;
00048 extern void pthread_testcancel(void)
00049
00050 ;
00051 extern void pthread_cleanup_pop(int execute)
00052
00053 ;
00054 extern void pthread_cleanup_push(void (*routine)(void*), void *arg)
00055
00056 ;
00057 extern void _pthread_cleanup_pop( struct _pthread_cleanup_buffer *__buffer, int execute)
00058
00059 ;
00060 extern void _pthread_cleanup_push( struct _pthread_cleanup_buffer *__buffer, void (*routine)(void*), void *arg)
00061
00062 ;
00063
00064 extern int pthread_mutexattr_destroy(pthread_mutexattr_t *attr)
00065
00066 ;
00067 extern int pthread_mutexattr_init( pthread_mutexattr_t *attr)
00068
00069 ;
00070
00071 int pthread_mutexattr_gettype(const pthread_mutexattr_t *restrict attr,
00072 int *restrict type)
00073 ;
00074 int pthread_mutexattr_settype(pthread_mutexattr_t *attr, int type)
00075
00076 ;
00077
00078 extern int pthread_mutex_destroy(pthread_mutex_t *mutex)
00079 ;
00080 extern int pthread_mutex_init( pthread_mutex_t *restrict mutex,
00081 const pthread_mutexattr_t *restrict attr)
00082
00083 ;
00084
00085 extern int pthread_mutex_lock(pthread_mutex_t *mutex)
00086
00087 ;
00088 extern int pthread_mutex_trylock(pthread_mutex_t *mutex)
00089
00090 ;
00091 extern int pthread_mutex_unlock(pthread_mutex_t *mutex)
00092
00093 ;
00094
00095 extern int pthread_cond_destroy(pthread_cond_t *cond)
00096 ;
00097 extern int pthread_cond_init( pthread_cond_t *restrict cond,
00098 const pthread_condattr_t *restrict attr)
00099
00100 ;
00101
00102 extern int pthread_cond_timedwait(pthread_cond_t *restrict cond,
00103 pthread_mutex_t *restrict mutex,
00104 const struct timespec *restrict abstime)
00105 ;
00106 extern int pthread_cond_wait(pthread_cond_t *restrict cond,
00107 pthread_mutex_t *restrict mutex)
00108 ;
00109 extern int pthread_cond_broadcast(pthread_cond_t *cond)
00110
00111 ;
00112 extern int pthread_cond_signal(pthread_cond_t *cond)
00113
00114 ;
00115
00116
00117
00118 #endif
00119
00120 #include <signal.h>
00121 #include <sys/signal.h>
00122 #include <sys/wait.h>
00123 #include <search.h>
00124
00125 #if defined(HAVE_PTHREAD_H)
00126
00127 #include <pthread.h>
00128
00129
00130 #if PTHREAD_MUTEX_DEFAULT != PTHREAD_MUTEX_NORMAL
00131 #error RPM expects PTHREAD_MUTEX_DEFAULT == PTHREAD_MUTEX_NORMAL
00132 #endif
00133
00134 #ifndef PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
00135
00136 static pthread_mutex_t rpmsigTbl_lock = PTHREAD_MUTEX_INITIALIZER;
00137 #else
00138
00139
00140 static pthread_mutex_t rpmsigTbl_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
00141
00142 #endif
00143
00144 #define DO_LOCK() pthread_mutex_lock(&rpmsigTbl_lock);
00145 #define DO_UNLOCK() pthread_mutex_unlock(&rpmsigTbl_lock);
00146 #define INIT_LOCK() \
00147 { pthread_mutexattr_t attr; \
00148 (void) pthread_mutexattr_init(&attr); \
00149 (void) pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); \
00150 (void) pthread_mutex_init (&rpmsigTbl_lock, &attr); \
00151 (void) pthread_mutexattr_destroy(&attr); \
00152 rpmsigTbl_sigchld->active = 0; \
00153 }
00154 #define ADD_REF(__tbl) (__tbl)->active++
00155 #define SUB_REF(__tbl) --(__tbl)->active
00156 #define CLEANUP_HANDLER(__handler, __arg, __oldtypeptr) \
00157 (void) pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, (__oldtypeptr));\
00158 pthread_cleanup_push((__handler), (__arg));
00159 #define CLEANUP_RESET(__execute, __oldtype) \
00160 pthread_cleanup_pop(__execute); \
00161 (void) pthread_setcanceltype ((__oldtype), &(__oldtype));
00162
00163 #define SAME_THREAD(_a, _b) pthread_equal(((pthread_t)_a), ((pthread_t)_b))
00164
00165 #define ME() ((void *)pthread_self())
00166
00167 #else
00168
00169 #define DO_LOCK()
00170 #define DO_UNLOCK()
00171 #define INIT_LOCK()
00172 #define ADD_REF(__tbl) (0)
00173 #define SUB_REF(__tbl) (0)
00174 #define CLEANUP_HANDLER(__handler, __arg, __oldtypeptr)
00175 #define CLEANUP_RESET(__execute, __oldtype)
00176
00177 #define SAME_THREAD(_a, _b) (42)
00178
00179 #define ME() (((void *)getpid()))
00180
00181 #endif
00182
00183 #include <rpmsq.h>
00184
00185 #include "debug.h"
00186
00187 #define _RPMSQ_DEBUG 0
00188
00189 int _rpmsq_debug = _RPMSQ_DEBUG;
00190
00191
00192 static struct rpmsqElem rpmsqRock;
00193
00194
00195
00196 rpmsq rpmsqQueue = &rpmsqRock;
00197
00198
00199 int rpmsqInsert(void * elem, void * prev)
00200 {
00201 rpmsq sq = (rpmsq) elem;
00202 int ret = -1;
00203
00204 if (sq != NULL) {
00205 #ifdef _RPMSQ_DEBUG
00206 if (_rpmsq_debug)
00207 fprintf(stderr, " Insert(%p): %p\n", ME(), sq);
00208 #endif
00209 ret = sighold(SIGCHLD);
00210 if (ret == 0) {
00211 sq->child = 0;
00212 sq->reaped = 0;
00213 sq->status = 0;
00214
00215 sq->reaper = 1;
00216
00217 sq->pipes[0] = sq->pipes[1] = -1;
00218
00219
00220 sq->id = ME();
00221 insque(elem, (prev != NULL ? prev : rpmsqQueue));
00222 ret = sigrelse(SIGCHLD);
00223 }
00224 }
00225 return ret;
00226 }
00227
00228 int rpmsqRemove(void * elem)
00229 {
00230 rpmsq sq = (rpmsq) elem;
00231 int ret = -1;
00232
00233 if (elem != NULL) {
00234
00235 #ifdef _RPMSQ_DEBUG
00236 if (_rpmsq_debug)
00237 fprintf(stderr, " Remove(%p): %p\n", ME(), sq);
00238 #endif
00239 ret = sighold (SIGCHLD);
00240 if (ret == 0) {
00241 remque(elem);
00242 sq->id = NULL;
00243
00244 if (sq->pipes[1] > 0) ret = close(sq->pipes[1]);
00245 if (sq->pipes[0] > 0) ret = close(sq->pipes[0]);
00246 sq->pipes[0] = sq->pipes[1] = -1;
00247
00248 #ifdef NOTYET
00249 sq->status = 0;
00250 sq->reaped = 0;
00251 sq->child = 0;
00252 #endif
00253 ret = sigrelse(SIGCHLD);
00254 }
00255 }
00256 return ret;
00257 }
00258
00259
00260 sigset_t rpmsqCaught;
00261
00262
00263
00264 static struct rpmsig_s {
00265 int signum;
00266 void (*handler) (int signum, void * info, void * context);
00267 int active;
00268 struct sigaction oact;
00269 } rpmsigTbl[] = {
00270 { SIGINT, rpmsqAction },
00271 #define rpmsigTbl_sigint (&rpmsigTbl[0])
00272 { SIGQUIT, rpmsqAction },
00273 #define rpmsigTbl_sigquit (&rpmsigTbl[1])
00274 { SIGCHLD, rpmsqAction },
00275 #define rpmsigTbl_sigchld (&rpmsigTbl[2])
00276 { SIGHUP, rpmsqAction },
00277 #define rpmsigTbl_sighup (&rpmsigTbl[3])
00278 { SIGTERM, rpmsqAction },
00279 #define rpmsigTbl_sigterm (&rpmsigTbl[4])
00280 { SIGPIPE, rpmsqAction },
00281 #define rpmsigTbl_sigpipe (&rpmsigTbl[5])
00282 { -1, NULL },
00283 };
00284
00285
00286 void rpmsqAction(int signum,
00287 void * info, void * context)
00288 {
00289 int save = errno;
00290 rpmsig tbl;
00291
00292 for (tbl = rpmsigTbl; tbl->signum >= 0; tbl++) {
00293 if (tbl->signum != signum)
00294 continue;
00295
00296 (void) sigaddset(&rpmsqCaught, signum);
00297
00298 switch (signum) {
00299 case SIGCHLD:
00300 while (1) {
00301 rpmsq sq;
00302 int status = 0;
00303 pid_t reaped = waitpid(0, &status, WNOHANG);
00304
00305
00306 if (reaped <= 0)
00307 break;
00308
00309
00310 for (sq = rpmsqQueue->q_forw;
00311 sq != NULL && sq != rpmsqQueue;
00312 sq = sq->q_forw)
00313 {
00314 int ret;
00315
00316 if (sq->child != reaped)
00317 continue;
00318 sq->reaped = reaped;
00319 sq->status = status;
00320
00321 ret = close(sq->pipes[1]); sq->pipes[1] = -1;
00322
00323 break;
00324 }
00325 }
00326 break;
00327 default:
00328 break;
00329 }
00330 break;
00331 }
00332 errno = save;
00333 }
00334
00335 int rpmsqEnable(int signum, rpmsqAction_t handler)
00336
00337
00338 {
00339 int tblsignum = (signum >= 0 ? signum : -signum);
00340 struct sigaction sa;
00341 rpmsig tbl;
00342 int ret = -1;
00343
00344 (void) DO_LOCK ();
00345 if (rpmsqQueue->id == NULL)
00346 rpmsqQueue->id = ME();
00347 for (tbl = rpmsigTbl; tbl->signum >= 0; tbl++) {
00348 if (tblsignum != tbl->signum)
00349 continue;
00350
00351 if (signum >= 0) {
00352 if (ADD_REF(tbl) <= 0) {
00353 (void) sigdelset(&rpmsqCaught, tbl->signum);
00354
00355
00356 (void) sigaction(tbl->signum, NULL, &tbl->oact);
00357 if (tbl->oact.sa_handler == SIG_IGN)
00358 continue;
00359
00360 (void) sigemptyset (&sa.sa_mask);
00361 sa.sa_flags = SA_SIGINFO;
00362 #if defined(__LCLINT__)
00363 sa.sa_handler = (handler != NULL ? handler : tbl->handler);
00364 #else
00365 sa.sa_sigaction = (handler != NULL ? handler : tbl->handler);
00366 #endif
00367 if (sigaction(tbl->signum, &sa, &tbl->oact) < 0) {
00368 SUB_REF(tbl);
00369 break;
00370 }
00371 tbl->active = 1;
00372 if (handler != NULL)
00373 tbl->handler = handler;
00374 }
00375 } else {
00376 if (SUB_REF(tbl) <= 0) {
00377 if (sigaction(tbl->signum, &tbl->oact, NULL) < 0)
00378 break;
00379 tbl->active = 0;
00380 tbl->handler = (handler != NULL ? handler : rpmsqAction);
00381 }
00382 }
00383 ret = tbl->active;
00384 break;
00385 }
00386 (void) DO_UNLOCK ();
00387 return ret;
00388 }
00389
00390 pid_t rpmsqFork(rpmsq sq)
00391 {
00392 pid_t pid;
00393 int xx;
00394
00395 if (sq->reaper) {
00396 xx = rpmsqInsert(sq, NULL);
00397 #ifdef _RPMSQ_DEBUG
00398 if (_rpmsq_debug)
00399 fprintf(stderr, " Enable(%p): %p\n", ME(), sq);
00400 #endif
00401 xx = rpmsqEnable(SIGCHLD, NULL);
00402 }
00403
00404 xx = pipe(sq->pipes);
00405
00406 xx = sighold(SIGCHLD);
00407
00408 pid = fork();
00409 if (pid < (pid_t) 0) {
00410
00411 xx = close(sq->pipes[0]);
00412 xx = close(sq->pipes[1]);
00413 sq->pipes[0] = sq->pipes[1] = -1;
00414
00415 goto out;
00416 } else if (pid == (pid_t) 0) {
00417 int yy;
00418
00419
00420
00421 xx = close(sq->pipes[1]);
00422 if (sq->reaper)
00423 xx = read(sq->pipes[0], &yy, sizeof(yy));
00424 xx = close(sq->pipes[0]);
00425 sq->pipes[0] = sq->pipes[1] = -1;
00426
00427
00428 #ifdef _RPMSQ_DEBUG
00429 if (_rpmsq_debug)
00430 fprintf(stderr, " Child(%p): %p child %d\n", ME(), sq, getpid());
00431 #endif
00432
00433 } else {
00434
00435 sq->child = pid;
00436
00437 #ifdef _RPMSQ_DEBUG
00438 if (_rpmsq_debug)
00439 fprintf(stderr, " Parent(%p): %p child %d\n", ME(), sq, sq->child);
00440 #endif
00441
00442 }
00443
00444 out:
00445 xx = sigrelse(SIGCHLD);
00446 return sq->child;
00447 }
00448
00455 static int rpmsqWaitUnregister(rpmsq sq)
00456
00457
00458 {
00459 int nothreads = 0;
00460 int ret = 0;
00461 int xx;
00462
00463 assert(sq->reaper);
00464
00465 ret = sighold(SIGCHLD);
00466
00467
00468
00469 if (sq->pipes[0] >= 0)
00470 xx = close(sq->pipes[0]);
00471 if (sq->pipes[1] >= 0)
00472 xx = close(sq->pipes[1]);
00473
00474
00475
00476 xx = pipe(sq->pipes);
00477
00478
00479 (void) rpmswEnter(&sq->op, -1);
00480
00481
00482
00483 while (ret == 0 && sq->reaped != sq->child) {
00484 if (nothreads)
00485
00486 ret = sigpause(SIGCHLD);
00487 else {
00488 xx = sigrelse(SIGCHLD);
00489
00490
00491 if (read(sq->pipes[0], &xx, sizeof(xx)) == 0) {
00492 xx = close(sq->pipes[0]); sq->pipes[0] = -1;
00493 ret = 1;
00494 }
00495
00496 xx = sighold(SIGCHLD);
00497 }
00498 }
00499
00500
00501
00502 sq->ms_scriptlets += rpmswExit(&sq->op, -1)/1000;
00503
00504 xx = sigrelse(SIGCHLD);
00505
00506 #ifdef _RPMSQ_DEBUG
00507 if (_rpmsq_debug)
00508 fprintf(stderr, " Wake(%p): %p child %d reaper %d ret %d\n", ME(), sq, sq->child, sq->reaper, ret);
00509 #endif
00510
00511
00512 xx = rpmsqRemove(sq);
00513
00514
00515 xx = rpmsqEnable(-SIGCHLD, NULL);
00516 #ifdef _RPMSQ_DEBUG
00517 if (_rpmsq_debug)
00518 fprintf(stderr, " Disable(%p): %p\n", ME(), sq);
00519 #endif
00520
00521 return ret;
00522 }
00523
00524 pid_t rpmsqWait(rpmsq sq)
00525 {
00526
00527 #ifdef _RPMSQ_DEBUG
00528 if (_rpmsq_debug)
00529 fprintf(stderr, " Wait(%p): %p child %d reaper %d\n", ME(), sq, sq->child, sq->reaper);
00530 #endif
00531
00532 if (sq->reaper) {
00533 (void) rpmsqWaitUnregister(sq);
00534 } else {
00535 pid_t reaped;
00536 int status;
00537 do {
00538 reaped = waitpid(sq->child, &status, 0);
00539 } while (reaped >= 0 && reaped != sq->child);
00540 sq->reaped = reaped;
00541 sq->status = status;
00542 #ifdef _RPMSQ_DEBUG
00543 if (_rpmsq_debug)
00544 fprintf(stderr, " Waitpid(%p): %p child %d reaped %d\n", ME(), sq, sq->child, sq->reaped);
00545 #endif
00546 }
00547
00548 #ifdef _RPMSQ_DEBUG
00549 if (_rpmsq_debug)
00550 fprintf(stderr, " Fini(%p): %p child %d status 0x%x\n", ME(), sq, sq->child, sq->status);
00551 #endif
00552
00553 return sq->reaped;
00554 }
00555
00556 void * rpmsqThread(void * (*start) (void * arg), void * arg)
00557 {
00558 pthread_t pth;
00559 int ret;
00560
00561 ret = pthread_create(&pth, NULL, start, arg);
00562 return (ret == 0 ? (void *)pth : NULL);
00563 }
00564
00565 int rpmsqJoin(void * thread)
00566 {
00567 pthread_t pth = (pthread_t) thread;
00568 if (thread == NULL)
00569 return EINVAL;
00570 return pthread_join(pth, NULL);
00571 }
00572
00573 int rpmsqThreadEqual(void * thread)
00574 {
00575 pthread_t t1 = (pthread_t) thread;
00576 pthread_t t2 = pthread_self();
00577 return pthread_equal(t1, t2);
00578 }
00579
00583 static void
00584 sigchld_cancel (void *arg)
00585
00586
00587 {
00588 pid_t child = *(pid_t *) arg;
00589 pid_t result;
00590
00591 (void) kill(child, SIGKILL);
00592
00593 do {
00594 result = waitpid(child, NULL, 0);
00595 } while (result == (pid_t)-1 && errno == EINTR);
00596
00597 (void) DO_LOCK ();
00598 if (SUB_REF (rpmsigTbl_sigchld) == 0) {
00599 (void) rpmsqEnable(-SIGQUIT, NULL);
00600 (void) rpmsqEnable(-SIGINT, NULL);
00601 }
00602 (void) DO_UNLOCK ();
00603 }
00604
00608 int
00609 rpmsqExecve (const char ** argv)
00610
00611
00612 {
00613 int oldtype;
00614 int status = -1;
00615 pid_t pid = 0;
00616 pid_t result;
00617 sigset_t newMask, oldMask;
00618 rpmsq sq = memset(alloca(sizeof(*sq)), 0, sizeof(*sq));
00619
00620 #ifndef PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
00621 INIT_LOCK ();
00622 #endif
00623
00624 (void) DO_LOCK ();
00625 if (ADD_REF (rpmsigTbl_sigchld) == 0) {
00626 if (rpmsqEnable(SIGINT, NULL) < 0) {
00627 SUB_REF (rpmsigTbl_sigchld);
00628 goto out;
00629 }
00630 if (rpmsqEnable(SIGQUIT, NULL) < 0) {
00631 SUB_REF (rpmsigTbl_sigchld);
00632 goto out_restore_sigint;
00633 }
00634 }
00635 (void) DO_UNLOCK ();
00636
00637 (void) sigemptyset (&newMask);
00638 (void) sigaddset (&newMask, SIGCHLD);
00639 if (sigprocmask (SIG_BLOCK, &newMask, &oldMask) < 0) {
00640 (void) DO_LOCK ();
00641 if (SUB_REF (rpmsigTbl_sigchld) == 0)
00642 goto out_restore_sigquit_and_sigint;
00643 goto out;
00644 }
00645
00646 CLEANUP_HANDLER(sigchld_cancel, &pid, &oldtype);
00647
00648 pid = fork ();
00649 if (pid < (pid_t) 0) {
00650 goto out;
00651 } else if (pid == (pid_t) 0) {
00652
00653
00654 (void) sigaction (SIGINT, &rpmsigTbl_sigint->oact, NULL);
00655 (void) sigaction (SIGQUIT, &rpmsigTbl_sigquit->oact, NULL);
00656 (void) sigprocmask (SIG_SETMASK, &oldMask, NULL);
00657
00658
00659 INIT_LOCK ();
00660
00661 (void) execve (argv[0], (char *const *) argv, environ);
00662 _exit (127);
00663 } else {
00664 do {
00665 result = waitpid(pid, &status, 0);
00666 } while (result == (pid_t)-1 && errno == EINTR);
00667 if (result != pid)
00668 status = -1;
00669 }
00670
00671 CLEANUP_RESET(0, oldtype);
00672
00673 (void) DO_LOCK ();
00674 if ((SUB_REF (rpmsigTbl_sigchld) == 0 &&
00675 (rpmsqEnable(-SIGINT, NULL) < 0 || rpmsqEnable (-SIGQUIT, NULL) < 0))
00676 || sigprocmask (SIG_SETMASK, &oldMask, NULL) != 0)
00677 {
00678 status = -1;
00679 }
00680 goto out;
00681
00682 out_restore_sigquit_and_sigint:
00683 (void) rpmsqEnable(-SIGQUIT, NULL);
00684 out_restore_sigint:
00685 (void) rpmsqEnable(-SIGINT, NULL);
00686 out:
00687 (void) DO_UNLOCK ();
00688 return status;
00689 }