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
00131 static pthread_mutex_t rpmsigTbl_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
00132
00133
00134 #define DO_LOCK() pthread_mutex_lock(&rpmsigTbl_lock);
00135 #define DO_UNLOCK() pthread_mutex_unlock(&rpmsigTbl_lock);
00136 #define INIT_LOCK() \
00137 { pthread_mutexattr_t attr; \
00138 pthread_mutexattr_init(&attr); \
00139 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); \
00140 pthread_mutex_init (&rpmsigTbl_lock, &attr); \
00141 pthread_mutexattr_destroy(&attr); \
00142 rpmsigTbl_sigchld->active = 0; \
00143 }
00144 #define ADD_REF(__tbl) (__tbl)->active++
00145 #define SUB_REF(__tbl) --(__tbl)->active
00146 #define CLEANUP_HANDLER(__handler, __arg, __oldtypeptr) \
00147 pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, (__oldtypeptr));\
00148 pthread_cleanup_push((__handler), (__arg));
00149 #define CLEANUP_RESET(__execute, __oldtype) \
00150 pthread_cleanup_pop(__execute); \
00151 pthread_setcanceltype ((__oldtype), &(__oldtype));
00152
00153 #define SAME_THREAD(_a, _b) pthread_equal(((pthread_t)_a), ((pthread_t)_b))
00154
00155 #define ME() ((void *)pthread_self())
00156
00157 #else
00158
00159 #define DO_LOCK()
00160 #define DO_UNLOCK()
00161 #define INIT_LOCK()
00162 #define ADD_REF(__tbl) (0)
00163 #define SUB_REF(__tbl) (0)
00164 #define CLEANUP_HANDLER(__handler, __arg, __oldtypeptr)
00165 #define CLEANUP_RESET(__execute, __oldtype)
00166
00167 #define SAME_THREAD(_a, _b) (42)
00168
00169 #define ME() (((void *)getpid()))
00170
00171 #endif
00172
00173 #include <rpmsq.h>
00174
00175 #include "debug.h"
00176
00177 #define _RPMSQ_DEBUG 0
00178
00179 int _rpmsq_debug = _RPMSQ_DEBUG;
00180
00181
00182 static struct rpmsqElem rpmsqRock;
00183
00184
00185
00186 rpmsq rpmsqQueue = &rpmsqRock;
00187
00188
00189 int rpmsqInsert(void * elem, void * prev)
00190 {
00191 rpmsq sq = (rpmsq) elem;
00192 int ret = -1;
00193
00194 if (sq != NULL) {
00195 #ifdef _RPMSQ_DEBUG
00196 if (_rpmsq_debug)
00197 fprintf(stderr, " Insert(%p): %p\n", ME(), sq);
00198 #endif
00199 ret = sighold(SIGCHLD);
00200 if (ret == 0) {
00201 sq->child = 0;
00202 sq->reaped = 0;
00203 sq->status = 0;
00204 sq->reaper = 1;
00205
00206 sq->pipes[0] = sq->pipes[1] = -1;
00207
00208
00209 sq->id = ME();
00210 ret = pthread_mutex_init(&sq->mutex, NULL);
00211 ret = pthread_cond_init(&sq->cond, NULL);
00212 insque(elem, (prev != NULL ? prev : rpmsqQueue));
00213 ret = sigrelse(SIGCHLD);
00214 }
00215 }
00216 return ret;
00217 }
00218
00219 int rpmsqRemove(void * elem)
00220 {
00221 rpmsq sq = (rpmsq) elem;
00222 int ret = -1;
00223
00224 if (elem != NULL) {
00225
00226 #ifdef _RPMSQ_DEBUG
00227 if (_rpmsq_debug)
00228 fprintf(stderr, " Remove(%p): %p\n", ME(), sq);
00229 #endif
00230 ret = sighold (SIGCHLD);
00231 if (ret == 0) {
00232 remque(elem);
00233 ret = pthread_cond_destroy(&sq->cond);
00234 ret = pthread_mutex_destroy(&sq->mutex);
00235 sq->id = NULL;
00236
00237 if (sq->pipes[1]) ret = close(sq->pipes[1]);
00238 if (sq->pipes[0]) ret = close(sq->pipes[0]);
00239 sq->pipes[0] = sq->pipes[1] = -1;
00240
00241 #ifdef NOTYET
00242 sq->reaper = 1;
00243 sq->status = 0;
00244 sq->reaped = 0;
00245 sq->child = 0;
00246 #endif
00247 ret = sigrelse(SIGCHLD);
00248 }
00249 }
00250 return ret;
00251 }
00252
00253
00254 sigset_t rpmsqCaught;
00255
00256
00257
00258 static struct rpmsig_s {
00259 int signum;
00260 void (*handler) (int signum, void * info, void * context);
00261 int active;
00262 struct sigaction oact;
00263 } rpmsigTbl[] = {
00264 { SIGINT, rpmsqAction },
00265 #define rpmsigTbl_sigint (&rpmsigTbl[0])
00266 { SIGQUIT, rpmsqAction },
00267 #define rpmsigTbl_sigquit (&rpmsigTbl[1])
00268 { SIGCHLD, rpmsqAction },
00269 #define rpmsigTbl_sigchld (&rpmsigTbl[2])
00270 { SIGHUP, rpmsqAction },
00271 #define rpmsigTbl_sighup (&rpmsigTbl[3])
00272 { SIGTERM, rpmsqAction },
00273 #define rpmsigTbl_sigterm (&rpmsigTbl[4])
00274 { SIGPIPE, rpmsqAction },
00275 #define rpmsigTbl_sigpipe (&rpmsigTbl[5])
00276 { -1, NULL },
00277 };
00278
00279
00280 void rpmsqAction(int signum,
00281 void * info, void * context)
00282 {
00283 int save = errno;
00284 rpmsig tbl;
00285
00286 for (tbl = rpmsigTbl; tbl->signum >= 0; tbl++) {
00287 if (tbl->signum != signum)
00288 continue;
00289
00290 (void) sigaddset(&rpmsqCaught, signum);
00291
00292 switch (signum) {
00293 case SIGCHLD:
00294 while (1) {
00295 rpmsq sq;
00296 int status = 0;
00297 pid_t reaped = waitpid(0, &status, WNOHANG);
00298
00299
00300 if (reaped <= 0)
00301 break;
00302
00303
00304 for (sq = rpmsqQueue->q_forw;
00305 sq != NULL && sq != rpmsqQueue;
00306 sq = sq->q_forw)
00307 {
00308 if (sq->child != reaped)
00309 continue;
00310 sq->reaped = reaped;
00311 sq->status = status;
00312 (void) pthread_cond_signal(&sq->cond);
00313 break;
00314 }
00315 }
00316 break;
00317 default:
00318 break;
00319 }
00320 break;
00321 }
00322 errno = save;
00323 }
00324
00325 int rpmsqEnable(int signum, rpmsqAction_t handler)
00326
00327
00328 {
00329 int tblsignum = (signum >= 0 ? signum : -signum);
00330 struct sigaction sa;
00331 rpmsig tbl;
00332 int ret = -1;
00333
00334 (void) DO_LOCK ();
00335 if (rpmsqQueue->id == NULL)
00336 rpmsqQueue->id = ME();
00337 for (tbl = rpmsigTbl; tbl->signum >= 0; tbl++) {
00338 if (tblsignum != tbl->signum)
00339 continue;
00340
00341 if (signum >= 0) {
00342 if (ADD_REF(tbl) <= 0) {
00343 (void) sigdelset(&rpmsqCaught, tbl->signum);
00344 (void) sigemptyset (&sa.sa_mask);
00345
00346 sa.sa_flags = SA_SIGINFO;
00347 sa.sa_sigaction = (handler != NULL ? handler : tbl->handler);
00348 if (sigaction(tbl->signum, &sa, &tbl->oact) < 0) {
00349 SUB_REF(tbl);
00350 break;
00351 }
00352
00353 tbl->active = 1;
00354 if (handler != NULL)
00355 tbl->handler = handler;
00356 }
00357 } else {
00358 if (SUB_REF(tbl) <= 0) {
00359 if (sigaction(tbl->signum, &tbl->oact, NULL) < 0)
00360 break;
00361 tbl->active = 0;
00362 tbl->handler = (handler != NULL ? handler : rpmsqAction);
00363 }
00364 }
00365 ret = tbl->active;
00366 break;
00367 }
00368 (void) DO_UNLOCK ();
00369 return ret;
00370 }
00371
00372 pid_t rpmsqFork(rpmsq sq)
00373 {
00374 pid_t pid;
00375 int xx;
00376
00377 if (sq->reaper) {
00378 xx = rpmsqInsert(sq, NULL);
00379 #ifdef _RPMSQ_DEBUG
00380 if (_rpmsq_debug)
00381 fprintf(stderr, " Enable(%p): %p\n", ME(), sq);
00382 #endif
00383 xx = rpmsqEnable(SIGCHLD, NULL);
00384 }
00385
00386 xx = pipe(sq->pipes);
00387
00388 xx = sighold(SIGCHLD);
00389
00390 pid = fork();
00391 if (pid < (pid_t) 0) {
00392
00393 xx = close(sq->pipes[0]);
00394 xx = close(sq->pipes[1]);
00395 sq->pipes[0] = sq->pipes[1] = -1;
00396
00397 goto out;
00398 } else if (pid == (pid_t) 0) {
00399 int yy;
00400
00401
00402
00403 xx = close(sq->pipes[1]);
00404 xx = read(sq->pipes[0], &yy, sizeof(yy));
00405 xx = close(sq->pipes[0]);
00406 sq->pipes[0] = sq->pipes[1] = -1;
00407
00408
00409 #ifdef _RPMSQ_DEBUG
00410 if (_rpmsq_debug)
00411 fprintf(stderr, " Child(%p): %p child %d\n", ME(), sq, getpid());
00412 #endif
00413
00414 } else {
00415
00416 sq->child = pid;
00417
00418 #ifdef _RPMSQ_DEBUG
00419 if (_rpmsq_debug)
00420 fprintf(stderr, " Parent(%p): %p child %d\n", ME(), sq, sq->child);
00421 #endif
00422
00423 }
00424
00425 out:
00426 xx = sigrelse(SIGCHLD);
00427 return sq->child;
00428 }
00429
00436 static int rpmsqWaitUnregister(rpmsq sq)
00437
00438
00439 {
00440 int nothreads = 0;
00441 int ret = 0;
00442 int xx;
00443
00444
00445 ret = sighold(SIGCHLD);
00446
00447
00448 if (!nothreads)
00449 ret = pthread_mutex_lock(&sq->mutex);
00450
00451
00452
00453 if (sq->pipes[0] >= 0)
00454 xx = close(sq->pipes[0]);
00455 if (sq->pipes[1] >= 0)
00456 xx = close(sq->pipes[1]);
00457 sq->pipes[0] = sq->pipes[1] = -1;
00458
00459
00460
00461 (void) rpmswEnter(&sq->op, -1);
00462
00463
00464
00465 while (ret == 0 && sq->reaped != sq->child) {
00466 if (nothreads)
00467
00468 ret = sigpause(SIGCHLD);
00469 else {
00470 xx = sigrelse(SIGCHLD);
00471 ret = pthread_cond_wait(&sq->cond, &sq->mutex);
00472 xx = sighold(SIGCHLD);
00473 }
00474 }
00475
00476
00477
00478 sq->ms_scriptlets += rpmswExit(&sq->op, -1)/1000;
00479
00480
00481 if (!nothreads)
00482 xx = pthread_mutex_unlock(&sq->mutex);
00483 xx = sigrelse(SIGCHLD);
00484
00485 #ifdef _RPMSQ_DEBUG
00486 if (_rpmsq_debug)
00487 fprintf(stderr, " Wake(%p): %p child %d reaper %d ret %d\n", ME(), sq, sq->child, sq->reaper, ret);
00488 #endif
00489
00490
00491 xx = rpmsqRemove(sq);
00492
00493
00494 xx = rpmsqEnable(-SIGCHLD, NULL);
00495 #ifdef _RPMSQ_DEBUG
00496 if (_rpmsq_debug)
00497 fprintf(stderr, " Disable(%p): %p\n", ME(), sq);
00498 #endif
00499
00500 return ret;
00501 }
00502
00503 pid_t rpmsqWait(rpmsq sq)
00504 {
00505
00506 #ifdef _RPMSQ_DEBUG
00507 if (_rpmsq_debug)
00508 fprintf(stderr, " Wait(%p): %p child %d reaper %d\n", ME(), sq, sq->child, sq->reaper);
00509 #endif
00510
00511 if (sq->reaper) {
00512 (void) rpmsqWaitUnregister(sq);
00513 } else {
00514 pid_t reaped;
00515 int status;
00516 do {
00517 reaped = waitpid(sq->child, &status, 0);
00518 } while (reaped >= 0 && reaped != sq->child);
00519 sq->reaped = reaped;
00520 sq->status = status;
00521 #ifdef _RPMSQ_DEBUG
00522 if (_rpmsq_debug)
00523 fprintf(stderr, " Waitpid(%p): %p child %d reaped %d\n", ME(), sq, sq->child, sq->reaped);
00524 #endif
00525 }
00526
00527 #ifdef _RPMSQ_DEBUG
00528 if (_rpmsq_debug)
00529 fprintf(stderr, " Fini(%p): %p child %d status 0x%x\n", ME(), sq, sq->child, sq->status);
00530 #endif
00531
00532 return sq->reaped;
00533 }
00534
00535 void * rpmsqThread(void * (*start) (void * arg), void * arg)
00536 {
00537 pthread_t pth;
00538 int ret;
00539
00540 ret = pthread_create(&pth, NULL, start, arg);
00541 return (ret == 0 ? (void *)pth : NULL);
00542 }
00543
00544 int rpmsqJoin(void * thread)
00545 {
00546 pthread_t pth = (pthread_t) thread;
00547 if (thread == NULL)
00548 return EINVAL;
00549 return pthread_join(pth, NULL);
00550 }
00551
00552 int rpmsqThreadEqual(void * thread)
00553 {
00554 pthread_t t1 = (pthread_t) thread;
00555 pthread_t t2 = pthread_self();
00556 return pthread_equal(t1, t2);
00557 }
00558
00562 static void
00563 sigchld_cancel (void *arg)
00564
00565
00566 {
00567 pid_t child = *(pid_t *) arg;
00568 pid_t result;
00569
00570 (void) kill(child, SIGKILL);
00571
00572 do {
00573 result = waitpid(child, NULL, 0);
00574 } while (result == (pid_t)-1 && errno == EINTR);
00575
00576 (void) DO_LOCK ();
00577 if (SUB_REF (rpmsigTbl_sigchld) == 0) {
00578 (void) rpmsqEnable(-SIGQUIT, NULL);
00579 (void) rpmsqEnable(-SIGINT, NULL);
00580 }
00581 (void) DO_UNLOCK ();
00582 }
00583
00587 int
00588 rpmsqExecve (const char ** argv)
00589
00590
00591 {
00592 int oldtype;
00593 int status = -1;
00594 pid_t pid = 0;
00595 pid_t result;
00596 sigset_t newMask, oldMask;
00597 rpmsq sq = memset(alloca(sizeof(*sq)), 0, sizeof(*sq));
00598
00599 (void) DO_LOCK ();
00600 if (ADD_REF (rpmsigTbl_sigchld) == 0) {
00601 if (rpmsqEnable(SIGINT, NULL) < 0) {
00602 SUB_REF (rpmsigTbl_sigchld);
00603 goto out;
00604 }
00605 if (rpmsqEnable(SIGQUIT, NULL) < 0) {
00606 SUB_REF (rpmsigTbl_sigchld);
00607 goto out_restore_sigint;
00608 }
00609 }
00610 (void) DO_UNLOCK ();
00611
00612 (void) sigemptyset (&newMask);
00613 (void) sigaddset (&newMask, SIGCHLD);
00614 if (sigprocmask (SIG_BLOCK, &newMask, &oldMask) < 0) {
00615 (void) DO_LOCK ();
00616 if (SUB_REF (rpmsigTbl_sigchld) == 0)
00617 goto out_restore_sigquit_and_sigint;
00618 goto out;
00619 }
00620
00621 CLEANUP_HANDLER(sigchld_cancel, &pid, &oldtype);
00622
00623 pid = fork ();
00624 if (pid < (pid_t) 0) {
00625 goto out;
00626 } else if (pid == (pid_t) 0) {
00627
00628
00629 (void) sigaction (SIGINT, &rpmsigTbl_sigint->oact, NULL);
00630 (void) sigaction (SIGQUIT, &rpmsigTbl_sigquit->oact, NULL);
00631 (void) sigprocmask (SIG_SETMASK, &oldMask, NULL);
00632
00633
00634 INIT_LOCK ();
00635
00636 (void) execve (argv[0], (char *const *) argv, environ);
00637 _exit (127);
00638 } else {
00639 do {
00640 result = waitpid(pid, &status, 0);
00641 } while (result == (pid_t)-1 && errno == EINTR);
00642 if (result != pid)
00643 status = -1;
00644 }
00645
00646 CLEANUP_RESET(0, oldtype);
00647
00648 (void) DO_LOCK ();
00649 if ((SUB_REF (rpmsigTbl_sigchld) == 0 &&
00650 (rpmsqEnable(-SIGINT, NULL) < 0 || rpmsqEnable (-SIGQUIT, NULL) < 0))
00651 || sigprocmask (SIG_SETMASK, &oldMask, NULL) != 0)
00652 {
00653 status = -1;
00654 }
00655 goto out;
00656
00657 out_restore_sigquit_and_sigint:
00658 (void) rpmsqEnable(-SIGQUIT, NULL);
00659 out_restore_sigint:
00660 (void) rpmsqEnable(-SIGINT, NULL);
00661 out:
00662 (void) DO_UNLOCK ();
00663 return status;
00664 }