dt_proc.c revision 210775
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27/* 28 * DTrace Process Control 29 * 30 * This file provides a set of routines that permit libdtrace and its clients 31 * to create and grab process handles using libproc, and to share these handles 32 * between library mechanisms that need libproc access, such as ustack(), and 33 * client mechanisms that need libproc access, such as dtrace(1M) -c and -p. 34 * The library provides several mechanisms in the libproc control layer: 35 * 36 * Reference Counting: The library code and client code can independently grab 37 * the same process handles without interfering with one another. Only when 38 * the reference count drops to zero and the handle is not being cached (see 39 * below for more information on caching) will Prelease() be called on it. 40 * 41 * Handle Caching: If a handle is grabbed PGRAB_RDONLY (e.g. by ustack()) and 42 * the reference count drops to zero, the handle is not immediately released. 43 * Instead, libproc handles are maintained on dph_lrulist in order from most- 44 * recently accessed to least-recently accessed. Idle handles are maintained 45 * until a pre-defined LRU cache limit is exceeded, permitting repeated calls 46 * to ustack() to avoid the overhead of releasing and re-grabbing processes. 47 * 48 * Process Control: For processes that are grabbed for control (~PGRAB_RDONLY) 49 * or created by dt_proc_create(), a control thread is created to provide 50 * callbacks on process exit and symbol table caching on dlopen()s. 51 * 52 * MT-Safety: Libproc is not MT-Safe, so dt_proc_lock() and dt_proc_unlock() 53 * are provided to synchronize access to the libproc handle between libdtrace 54 * code and client code and the control thread's use of the ps_prochandle. 55 * 56 * NOTE: MT-Safety is NOT provided for libdtrace itself, or for use of the 57 * dtrace_proc_grab/dtrace_proc_create mechanisms. Like all exported libdtrace 58 * calls, these are assumed to be MT-Unsafe. MT-Safety is ONLY provided for 59 * synchronization between libdtrace control threads and the client thread. 60 * 61 * The ps_prochandles themselves are maintained along with a dt_proc_t struct 62 * in a hash table indexed by PID. This provides basic locking and reference 63 * counting. The dt_proc_t is also maintained in LRU order on dph_lrulist. 64 * The dph_lrucnt and dph_lrulim count the number of cacheable processes and 65 * the current limit on the number of actively cached entries. 66 * 67 * The control thread for a process establishes breakpoints at the rtld_db 68 * locations of interest, updates mappings and symbol tables at these points, 69 * and handles exec and fork (by always following the parent). The control 70 * thread automatically exits when the process dies or control is lost. 71 * 72 * A simple notification mechanism is provided for libdtrace clients using 73 * dtrace_handle_proc() for notification of PS_UNDEAD or PS_LOST events. If 74 * such an event occurs, the dt_proc_t itself is enqueued on a notification 75 * list and the control thread broadcasts to dph_cv. dtrace_sleep() will wake 76 * up using this condition and will then call the client handler as necessary. 77 */ 78 79#include <sys/wait.h> 80#if defined(sun) 81#include <sys/lwp.h> 82#endif 83#include <strings.h> 84#include <signal.h> 85#include <assert.h> 86#include <errno.h> 87 88#include <dt_proc.h> 89#include <dt_pid.h> 90#include <dt_impl.h> 91 92#define IS_SYS_EXEC(w) (w == SYS_execve) 93#define IS_SYS_FORK(w) (w == SYS_vfork || w == SYS_forksys) 94 95#ifdef DOODAD 96static dt_bkpt_t * 97dt_proc_bpcreate(dt_proc_t *dpr, uintptr_t addr, dt_bkpt_f *func, void *data) 98{ 99 struct ps_prochandle *P = dpr->dpr_proc; 100 dt_bkpt_t *dbp; 101 102 assert(DT_MUTEX_HELD(&dpr->dpr_lock)); 103 104 if ((dbp = dt_zalloc(dpr->dpr_hdl, sizeof (dt_bkpt_t))) != NULL) { 105 dbp->dbp_func = func; 106 dbp->dbp_data = data; 107 dbp->dbp_addr = addr; 108 109 if (Psetbkpt(P, dbp->dbp_addr, &dbp->dbp_instr) == 0) 110 dbp->dbp_active = B_TRUE; 111 112 dt_list_append(&dpr->dpr_bps, dbp); 113 } 114 115 return (dbp); 116} 117#endif 118 119static void 120dt_proc_bpdestroy(dt_proc_t *dpr, int delbkpts) 121{ 122#if defined(sun) 123 int state = Pstate(dpr->dpr_proc); 124#else 125 int state = proc_state(dpr->dpr_proc); 126#endif 127 dt_bkpt_t *dbp, *nbp; 128 129 assert(DT_MUTEX_HELD(&dpr->dpr_lock)); 130 131 for (dbp = dt_list_next(&dpr->dpr_bps); dbp != NULL; dbp = nbp) { 132printf("%s:%s(%d): DOODAD\n",__FUNCTION__,__FILE__,__LINE__); 133#ifdef DOODAD 134 if (delbkpts && dbp->dbp_active && 135 state != PS_LOST && state != PS_UNDEAD) { 136 (void) Pdelbkpt(dpr->dpr_proc, 137 dbp->dbp_addr, dbp->dbp_instr); 138 } 139#endif 140 nbp = dt_list_next(dbp); 141 dt_list_delete(&dpr->dpr_bps, dbp); 142 dt_free(dpr->dpr_hdl, dbp); 143 } 144} 145 146#ifdef DOODAD 147static void 148dt_proc_bpmatch(dtrace_hdl_t *dtp, dt_proc_t *dpr) 149{ 150 const lwpstatus_t *psp = &Pstatus(dpr->dpr_proc)->pr_lwp; 151 dt_bkpt_t *dbp; 152 153 assert(DT_MUTEX_HELD(&dpr->dpr_lock)); 154 155 for (dbp = dt_list_next(&dpr->dpr_bps); 156 dbp != NULL; dbp = dt_list_next(dbp)) { 157 if (psp->pr_reg[R_PC] == dbp->dbp_addr) 158 break; 159 } 160 161 if (dbp == NULL) { 162 dt_dprintf("pid %d: spurious breakpoint wakeup for %lx\n", 163 (int)dpr->dpr_pid, (ulong_t)psp->pr_reg[R_PC]); 164 return; 165 } 166 167 dt_dprintf("pid %d: hit breakpoint at %lx (%lu)\n", 168 (int)dpr->dpr_pid, (ulong_t)dbp->dbp_addr, ++dbp->dbp_hits); 169 170 dbp->dbp_func(dtp, dpr, dbp->dbp_data); 171 (void) Pxecbkpt(dpr->dpr_proc, dbp->dbp_instr); 172} 173#endif 174 175static void 176dt_proc_bpenable(dt_proc_t *dpr) 177{ 178 dt_bkpt_t *dbp; 179 180 assert(DT_MUTEX_HELD(&dpr->dpr_lock)); 181 182 for (dbp = dt_list_next(&dpr->dpr_bps); 183 dbp != NULL; dbp = dt_list_next(dbp)) { 184printf("%s:%s(%d): DOODAD\n",__FUNCTION__,__FILE__,__LINE__); 185#ifdef DOODAD 186 if (!dbp->dbp_active && Psetbkpt(dpr->dpr_proc, 187 dbp->dbp_addr, &dbp->dbp_instr) == 0) 188 dbp->dbp_active = B_TRUE; 189#endif 190 } 191 192 dt_dprintf("breakpoints enabled\n"); 193} 194 195static void 196dt_proc_bpdisable(dt_proc_t *dpr) 197{ 198 dt_bkpt_t *dbp; 199 200 assert(DT_MUTEX_HELD(&dpr->dpr_lock)); 201 202 for (dbp = dt_list_next(&dpr->dpr_bps); 203 dbp != NULL; dbp = dt_list_next(dbp)) { 204printf("%s:%s(%d): DOODAD\n",__FUNCTION__,__FILE__,__LINE__); 205#ifdef DOODAD 206 if (dbp->dbp_active && Pdelbkpt(dpr->dpr_proc, 207 dbp->dbp_addr, dbp->dbp_instr) == 0) 208 dbp->dbp_active = B_FALSE; 209#endif 210 } 211 212 dt_dprintf("breakpoints disabled\n"); 213} 214 215static void 216dt_proc_notify(dtrace_hdl_t *dtp, dt_proc_hash_t *dph, dt_proc_t *dpr, 217 const char *msg) 218{ 219 dt_proc_notify_t *dprn = dt_alloc(dtp, sizeof (dt_proc_notify_t)); 220 221 if (dprn == NULL) { 222 dt_dprintf("failed to allocate notification for %d %s\n", 223 (int)dpr->dpr_pid, msg); 224 } else { 225 dprn->dprn_dpr = dpr; 226 if (msg == NULL) 227 dprn->dprn_errmsg[0] = '\0'; 228 else 229 (void) strlcpy(dprn->dprn_errmsg, msg, 230 sizeof (dprn->dprn_errmsg)); 231 232 (void) pthread_mutex_lock(&dph->dph_lock); 233 234 dprn->dprn_next = dph->dph_notify; 235 dph->dph_notify = dprn; 236 237 (void) pthread_cond_broadcast(&dph->dph_cv); 238 (void) pthread_mutex_unlock(&dph->dph_lock); 239 } 240} 241 242/* 243 * Check to see if the control thread was requested to stop when the victim 244 * process reached a particular event (why) rather than continuing the victim. 245 * If 'why' is set in the stop mask, we wait on dpr_cv for dt_proc_continue(). 246 * If 'why' is not set, this function returns immediately and does nothing. 247 */ 248static void 249dt_proc_stop(dt_proc_t *dpr, uint8_t why) 250{ 251 assert(DT_MUTEX_HELD(&dpr->dpr_lock)); 252 assert(why != DT_PROC_STOP_IDLE); 253 254 if (dpr->dpr_stop & why) { 255 dpr->dpr_stop |= DT_PROC_STOP_IDLE; 256 dpr->dpr_stop &= ~why; 257 258 (void) pthread_cond_broadcast(&dpr->dpr_cv); 259 260 /* 261 * We disable breakpoints while stopped to preserve the 262 * integrity of the program text for both our own disassembly 263 * and that of the kernel. 264 */ 265 dt_proc_bpdisable(dpr); 266 267 while (dpr->dpr_stop & DT_PROC_STOP_IDLE) 268 (void) pthread_cond_wait(&dpr->dpr_cv, &dpr->dpr_lock); 269 270 dt_proc_bpenable(dpr); 271 } 272} 273 274/*ARGSUSED*/ 275static void 276dt_proc_bpmain(dtrace_hdl_t *dtp, dt_proc_t *dpr, const char *fname) 277{ 278 dt_dprintf("pid %d: breakpoint at %s()\n", (int)dpr->dpr_pid, fname); 279 dt_proc_stop(dpr, DT_PROC_STOP_MAIN); 280} 281 282#if defined(sun) 283static void 284dt_proc_rdevent(dtrace_hdl_t *dtp, dt_proc_t *dpr, const char *evname) 285{ 286 rd_event_msg_t rdm; 287 rd_err_e err; 288 289 if ((err = rd_event_getmsg(dpr->dpr_rtld, &rdm)) != RD_OK) { 290 dt_dprintf("pid %d: failed to get %s event message: %s\n", 291 (int)dpr->dpr_pid, evname, rd_errstr(err)); 292 return; 293 } 294 295 dt_dprintf("pid %d: rtld event %s type=%d state %d\n", 296 (int)dpr->dpr_pid, evname, rdm.type, rdm.u.state); 297 298 switch (rdm.type) { 299 case RD_DLACTIVITY: 300 if (rdm.u.state != RD_CONSISTENT) 301 break; 302 303 Pupdate_syms(dpr->dpr_proc); 304 if (dt_pid_create_probes_module(dtp, dpr) != 0) 305 dt_proc_notify(dtp, dtp->dt_procs, dpr, 306 dpr->dpr_errmsg); 307 308 break; 309 case RD_PREINIT: 310 Pupdate_syms(dpr->dpr_proc); 311 dt_proc_stop(dpr, DT_PROC_STOP_PREINIT); 312 break; 313 case RD_POSTINIT: 314 Pupdate_syms(dpr->dpr_proc); 315 dt_proc_stop(dpr, DT_PROC_STOP_POSTINIT); 316 break; 317 } 318} 319 320static void 321dt_proc_rdwatch(dt_proc_t *dpr, rd_event_e event, const char *evname) 322{ 323 rd_notify_t rdn; 324 rd_err_e err; 325 326 if ((err = rd_event_addr(dpr->dpr_rtld, event, &rdn)) != RD_OK) { 327 dt_dprintf("pid %d: failed to get event address for %s: %s\n", 328 (int)dpr->dpr_pid, evname, rd_errstr(err)); 329 return; 330 } 331 332 if (rdn.type != RD_NOTIFY_BPT) { 333 dt_dprintf("pid %d: event %s has unexpected type %d\n", 334 (int)dpr->dpr_pid, evname, rdn.type); 335 return; 336 } 337 338 (void) dt_proc_bpcreate(dpr, rdn.u.bptaddr, 339 (dt_bkpt_f *)dt_proc_rdevent, (void *)evname); 340} 341 342/* 343 * Common code for enabling events associated with the run-time linker after 344 * attaching to a process or after a victim process completes an exec(2). 345 */ 346static void 347dt_proc_attach(dt_proc_t *dpr, int exec) 348{ 349 const pstatus_t *psp = Pstatus(dpr->dpr_proc); 350 rd_err_e err; 351 GElf_Sym sym; 352 353 assert(DT_MUTEX_HELD(&dpr->dpr_lock)); 354 355 if (exec) { 356 if (psp->pr_lwp.pr_errno != 0) 357 return; /* exec failed: nothing needs to be done */ 358 359 dt_proc_bpdestroy(dpr, B_FALSE); 360 Preset_maps(dpr->dpr_proc); 361 } 362 363 if ((dpr->dpr_rtld = Prd_agent(dpr->dpr_proc)) != NULL && 364 (err = rd_event_enable(dpr->dpr_rtld, B_TRUE)) == RD_OK) { 365 dt_proc_rdwatch(dpr, RD_PREINIT, "RD_PREINIT"); 366 dt_proc_rdwatch(dpr, RD_POSTINIT, "RD_POSTINIT"); 367 dt_proc_rdwatch(dpr, RD_DLACTIVITY, "RD_DLACTIVITY"); 368 } else { 369 dt_dprintf("pid %d: failed to enable rtld events: %s\n", 370 (int)dpr->dpr_pid, dpr->dpr_rtld ? rd_errstr(err) : 371 "rtld_db agent initialization failed"); 372 } 373 374 Pupdate_maps(dpr->dpr_proc); 375 376 if (Pxlookup_by_name(dpr->dpr_proc, LM_ID_BASE, 377 "a.out", "main", &sym, NULL) == 0) { 378 (void) dt_proc_bpcreate(dpr, (uintptr_t)sym.st_value, 379 (dt_bkpt_f *)dt_proc_bpmain, "a.out`main"); 380 } else { 381 dt_dprintf("pid %d: failed to find a.out`main: %s\n", 382 (int)dpr->dpr_pid, strerror(errno)); 383 } 384} 385 386/* 387 * Wait for a stopped process to be set running again by some other debugger. 388 * This is typically not required by /proc-based debuggers, since the usual 389 * model is that one debugger controls one victim. But DTrace, as usual, has 390 * its own needs: the stop() action assumes that prun(1) or some other tool 391 * will be applied to resume the victim process. This could be solved by 392 * adding a PCWRUN directive to /proc, but that seems like overkill unless 393 * other debuggers end up needing this functionality, so we implement a cheap 394 * equivalent to PCWRUN using the set of existing kernel mechanisms. 395 * 396 * Our intent is really not just to wait for the victim to run, but rather to 397 * wait for it to run and then stop again for a reason other than the current 398 * PR_REQUESTED stop. Since PCWSTOP/Pstopstatus() can be applied repeatedly 399 * to a stopped process and will return the same result without affecting the 400 * victim, we can just perform these operations repeatedly until Pstate() 401 * changes, the representative LWP ID changes, or the stop timestamp advances. 402 * dt_proc_control() will then rediscover the new state and continue as usual. 403 * When the process is still stopped in the same exact state, we sleep for a 404 * brief interval before waiting again so as not to spin consuming CPU cycles. 405 */ 406static void 407dt_proc_waitrun(dt_proc_t *dpr) 408{ 409 struct ps_prochandle *P = dpr->dpr_proc; 410 const lwpstatus_t *psp = &Pstatus(P)->pr_lwp; 411 412 int krflag = psp->pr_flags & (PR_KLC | PR_RLC); 413 timestruc_t tstamp = psp->pr_tstamp; 414 lwpid_t lwpid = psp->pr_lwpid; 415 416 const long wstop = PCWSTOP; 417 int pfd = Pctlfd(P); 418 419 assert(DT_MUTEX_HELD(&dpr->dpr_lock)); 420 assert(psp->pr_flags & PR_STOPPED); 421 assert(Pstate(P) == PS_STOP); 422 423 /* 424 * While we are waiting for the victim to run, clear PR_KLC and PR_RLC 425 * so that if the libdtrace client is killed, the victim stays stopped. 426 * dt_proc_destroy() will also observe this and perform PRELEASE_HANG. 427 */ 428 (void) Punsetflags(P, krflag); 429 Psync(P); 430 431 (void) pthread_mutex_unlock(&dpr->dpr_lock); 432 433 while (!dpr->dpr_quit) { 434 if (write(pfd, &wstop, sizeof (wstop)) == -1 && errno == EINTR) 435 continue; /* check dpr_quit and continue waiting */ 436 437 (void) pthread_mutex_lock(&dpr->dpr_lock); 438 (void) Pstopstatus(P, PCNULL, 0); 439 psp = &Pstatus(P)->pr_lwp; 440 441 /* 442 * If we've reached a new state, found a new representative, or 443 * the stop timestamp has changed, restore PR_KLC/PR_RLC to its 444 * original setting and then return with dpr_lock held. 445 */ 446 if (Pstate(P) != PS_STOP || psp->pr_lwpid != lwpid || 447 bcmp(&psp->pr_tstamp, &tstamp, sizeof (tstamp)) != 0) { 448 (void) Psetflags(P, krflag); 449 Psync(P); 450 return; 451 } 452 453 (void) pthread_mutex_unlock(&dpr->dpr_lock); 454 (void) poll(NULL, 0, MILLISEC / 2); 455 } 456 457 (void) pthread_mutex_lock(&dpr->dpr_lock); 458} 459#endif 460 461typedef struct dt_proc_control_data { 462 dtrace_hdl_t *dpcd_hdl; /* DTrace handle */ 463 dt_proc_t *dpcd_proc; /* proccess to control */ 464} dt_proc_control_data_t; 465 466/* 467 * Main loop for all victim process control threads. We initialize all the 468 * appropriate /proc control mechanisms, and then enter a loop waiting for 469 * the process to stop on an event or die. We process any events by calling 470 * appropriate subroutines, and exit when the victim dies or we lose control. 471 * 472 * The control thread synchronizes the use of dpr_proc with other libdtrace 473 * threads using dpr_lock. We hold the lock for all of our operations except 474 * waiting while the process is running: this is accomplished by writing a 475 * PCWSTOP directive directly to the underlying /proc/<pid>/ctl file. If the 476 * libdtrace client wishes to exit or abort our wait, SIGCANCEL can be used. 477 */ 478static void * 479dt_proc_control(void *arg) 480{ 481 dt_proc_control_data_t *datap = arg; 482 dtrace_hdl_t *dtp = datap->dpcd_hdl; 483 dt_proc_t *dpr = datap->dpcd_proc; 484 dt_proc_hash_t *dph = dpr->dpr_hdl->dt_procs; 485 struct ps_prochandle *P = dpr->dpr_proc; 486 int pid = dpr->dpr_pid; 487 488#if defined(sun) 489 int pfd = Pctlfd(P); 490 491 const long wstop = PCWSTOP; 492#endif 493 int notify = B_FALSE; 494 495 /* 496 * We disable the POSIX thread cancellation mechanism so that the 497 * client program using libdtrace can't accidentally cancel our thread. 498 * dt_proc_destroy() uses SIGCANCEL explicitly to simply poke us out 499 * of PCWSTOP with EINTR, at which point we will see dpr_quit and exit. 500 */ 501 (void) pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL); 502 503 /* 504 * Set up the corresponding process for tracing by libdtrace. We want 505 * to be able to catch breakpoints and efficiently single-step over 506 * them, and we need to enable librtld_db to watch libdl activity. 507 */ 508 (void) pthread_mutex_lock(&dpr->dpr_lock); 509 510#if defined(sun) 511 (void) Punsetflags(P, PR_ASYNC); /* require synchronous mode */ 512 (void) Psetflags(P, PR_BPTADJ); /* always adjust eip on x86 */ 513 (void) Punsetflags(P, PR_FORK); /* do not inherit on fork */ 514 515 (void) Pfault(P, FLTBPT, B_TRUE); /* always trace breakpoints */ 516 (void) Pfault(P, FLTTRACE, B_TRUE); /* always trace single-step */ 517 518 /* 519 * We must trace exit from exec() system calls so that if the exec is 520 * successful, we can reset our breakpoints and re-initialize libproc. 521 */ 522 (void) Psysexit(P, SYS_execve, B_TRUE); 523 524 /* 525 * We must trace entry and exit for fork() system calls in order to 526 * disable our breakpoints temporarily during the fork. We do not set 527 * the PR_FORK flag, so if fork succeeds the child begins executing and 528 * does not inherit any other tracing behaviors or a control thread. 529 */ 530 (void) Psysentry(P, SYS_vfork, B_TRUE); 531 (void) Psysexit(P, SYS_vfork, B_TRUE); 532 (void) Psysentry(P, SYS_forksys, B_TRUE); 533 (void) Psysexit(P, SYS_forksys, B_TRUE); 534 535 Psync(P); /* enable all /proc changes */ 536 dt_proc_attach(dpr, B_FALSE); /* enable rtld breakpoints */ 537 538 /* 539 * If PR_KLC is set, we created the process; otherwise we grabbed it. 540 * Check for an appropriate stop request and wait for dt_proc_continue. 541 */ 542 if (Pstatus(P)->pr_flags & PR_KLC) 543 dt_proc_stop(dpr, DT_PROC_STOP_CREATE); 544 else 545 dt_proc_stop(dpr, DT_PROC_STOP_GRAB); 546 547 if (Psetrun(P, 0, 0) == -1) { 548 dt_dprintf("pid %d: failed to set running: %s\n", 549 (int)dpr->dpr_pid, strerror(errno)); 550 } 551#else 552 /* 553 * If PR_KLC is set, we created the process; otherwise we grabbed it. 554 * Check for an appropriate stop request and wait for dt_proc_continue. 555 */ 556 if (proc_getflags(P) & PR_KLC) 557 dt_proc_stop(dpr, DT_PROC_STOP_CREATE); 558 else 559 dt_proc_stop(dpr, DT_PROC_STOP_GRAB); 560 561 if (proc_continue(P) != 0) 562 dt_dprintf("pid %d: failed to set running: %s\n", 563 (int)dpr->dpr_pid, strerror(errno)); 564#endif 565 566 (void) pthread_mutex_unlock(&dpr->dpr_lock); 567 568 /* 569 * Wait for the process corresponding to this control thread to stop, 570 * process the event, and then set it running again. We want to sleep 571 * with dpr_lock *unheld* so that other parts of libdtrace can use the 572 * ps_prochandle in the meantime (e.g. ustack()). To do this, we write 573 * a PCWSTOP directive directly to the underlying /proc/<pid>/ctl file. 574 * Once the process stops, we wake up, grab dpr_lock, and then call 575 * Pwait() (which will return immediately) and do our processing. 576 */ 577 while (!dpr->dpr_quit) { 578#if defined(sun) 579 const lwpstatus_t *psp; 580 581 if (write(pfd, &wstop, sizeof (wstop)) == -1 && errno == EINTR) 582 continue; /* check dpr_quit and continue waiting */ 583#else 584 /* Wait for the process to report status. */ 585 proc_wstatus(P); 586#endif 587 588 (void) pthread_mutex_lock(&dpr->dpr_lock); 589 590#if defined(sun) 591pwait_locked: 592 if (Pstopstatus(P, PCNULL, 0) == -1 && errno == EINTR) { 593 (void) pthread_mutex_unlock(&dpr->dpr_lock); 594 continue; /* check dpr_quit and continue waiting */ 595 } 596#endif 597 598#if defined(sun) 599 switch (Pstate(P)) { 600#else 601 switch (proc_state(P)) { 602#endif 603 case PS_STOP: 604#ifdef DOODAD 605 psp = &Pstatus(P)->pr_lwp; 606 607 dt_dprintf("pid %d: proc stopped showing %d/%d\n", 608 pid, psp->pr_why, psp->pr_what); 609 610 /* 611 * If the process stops showing PR_REQUESTED, then the 612 * DTrace stop() action was applied to it or another 613 * debugging utility (e.g. pstop(1)) asked it to stop. 614 * In either case, the user's intention is for the 615 * process to remain stopped until another external 616 * mechanism (e.g. prun(1)) is applied. So instead of 617 * setting the process running ourself, we wait for 618 * someone else to do so. Once that happens, we return 619 * to our normal loop waiting for an event of interest. 620 */ 621 if (psp->pr_why == PR_REQUESTED) { 622 dt_proc_waitrun(dpr); 623 (void) pthread_mutex_unlock(&dpr->dpr_lock); 624 continue; 625 } 626 627 /* 628 * If the process stops showing one of the events that 629 * we are tracing, perform the appropriate response. 630 * Note that we ignore PR_SUSPENDED, PR_CHECKPOINT, and 631 * PR_JOBCONTROL by design: if one of these conditions 632 * occurs, we will fall through to Psetrun() but the 633 * process will remain stopped in the kernel by the 634 * corresponding mechanism (e.g. job control stop). 635 */ 636 if (psp->pr_why == PR_FAULTED && psp->pr_what == FLTBPT) 637 dt_proc_bpmatch(dtp, dpr); 638 else if (psp->pr_why == PR_SYSENTRY && 639 IS_SYS_FORK(psp->pr_what)) 640 dt_proc_bpdisable(dpr); 641 else if (psp->pr_why == PR_SYSEXIT && 642 IS_SYS_FORK(psp->pr_what)) 643 dt_proc_bpenable(dpr); 644 else if (psp->pr_why == PR_SYSEXIT && 645 IS_SYS_EXEC(psp->pr_what)) 646 dt_proc_attach(dpr, B_TRUE); 647#endif 648 break; 649 650 case PS_LOST: 651#if defined(sun) 652 if (Preopen(P) == 0) 653 goto pwait_locked; 654#endif 655 656 dt_dprintf("pid %d: proc lost: %s\n", 657 pid, strerror(errno)); 658 659 dpr->dpr_quit = B_TRUE; 660 notify = B_TRUE; 661 break; 662 663 case PS_UNDEAD: 664 dt_dprintf("pid %d: proc died\n", pid); 665 dpr->dpr_quit = B_TRUE; 666 notify = B_TRUE; 667 break; 668 } 669 670#if defined(sun) 671 if (Pstate(P) != PS_UNDEAD && Psetrun(P, 0, 0) == -1) { 672 dt_dprintf("pid %d: failed to set running: %s\n", 673 (int)dpr->dpr_pid, strerror(errno)); 674 } 675#endif 676 677 (void) pthread_mutex_unlock(&dpr->dpr_lock); 678 } 679 680 /* 681 * If the control thread detected PS_UNDEAD or PS_LOST, then enqueue 682 * the dt_proc_t structure on the dt_proc_hash_t notification list. 683 */ 684 if (notify) 685 dt_proc_notify(dtp, dph, dpr, NULL); 686 687 /* 688 * Destroy and remove any remaining breakpoints, set dpr_done and clear 689 * dpr_tid to indicate the control thread has exited, and notify any 690 * waiting thread in dt_proc_destroy() that we have succesfully exited. 691 */ 692 (void) pthread_mutex_lock(&dpr->dpr_lock); 693 694 dt_proc_bpdestroy(dpr, B_TRUE); 695 dpr->dpr_done = B_TRUE; 696 dpr->dpr_tid = 0; 697 698 (void) pthread_cond_broadcast(&dpr->dpr_cv); 699 (void) pthread_mutex_unlock(&dpr->dpr_lock); 700 701 return (NULL); 702} 703 704/*PRINTFLIKE3*/ 705static struct ps_prochandle * 706dt_proc_error(dtrace_hdl_t *dtp, dt_proc_t *dpr, const char *format, ...) 707{ 708 va_list ap; 709 710 va_start(ap, format); 711 dt_set_errmsg(dtp, NULL, NULL, NULL, 0, format, ap); 712 va_end(ap); 713 714 if (dpr->dpr_proc != NULL) 715#if defined(sun) 716 Prelease(dpr->dpr_proc, 0); 717#else 718 proc_detach(dpr->dpr_proc, 0); 719#endif 720 721 dt_free(dtp, dpr); 722 (void) dt_set_errno(dtp, EDT_COMPILER); 723 return (NULL); 724} 725 726dt_proc_t * 727dt_proc_lookup(dtrace_hdl_t *dtp, struct ps_prochandle *P, int remove) 728{ 729 dt_proc_hash_t *dph = dtp->dt_procs; 730#if defined(sun) 731 pid_t pid = Pstatus(P)->pr_pid; 732#else 733 pid_t pid = proc_getpid(P); 734#endif 735 dt_proc_t *dpr, **dpp = &dph->dph_hash[pid & (dph->dph_hashlen - 1)]; 736 737 for (dpr = *dpp; dpr != NULL; dpr = dpr->dpr_hash) { 738 if (dpr->dpr_pid == pid) 739 break; 740 else 741 dpp = &dpr->dpr_hash; 742 } 743 744 assert(dpr != NULL); 745 assert(dpr->dpr_proc == P); 746 747 if (remove) 748 *dpp = dpr->dpr_hash; /* remove from pid hash chain */ 749 750 return (dpr); 751} 752 753static void 754dt_proc_destroy(dtrace_hdl_t *dtp, struct ps_prochandle *P) 755{ 756 dt_proc_t *dpr = dt_proc_lookup(dtp, P, B_FALSE); 757 dt_proc_hash_t *dph = dtp->dt_procs; 758 dt_proc_notify_t *npr, **npp; 759 int rflag; 760 761 assert(dpr != NULL); 762 763 /* 764 * If neither PR_KLC nor PR_RLC is set, then the process is stopped by 765 * an external debugger and we were waiting in dt_proc_waitrun(). 766 * Leave the process in this condition using PRELEASE_HANG. 767 */ 768#if defined(sun) 769 if (!(Pstatus(dpr->dpr_proc)->pr_flags & (PR_KLC | PR_RLC))) { 770#else 771 if (!(proc_getflags(dpr->dpr_proc) & (PR_KLC | PR_RLC))) { 772#endif 773 dt_dprintf("abandoning pid %d\n", (int)dpr->dpr_pid); 774 rflag = PRELEASE_HANG; 775#if defined(sun) 776 } else if (Pstatus(dpr->dpr_proc)->pr_flags & PR_KLC) { 777#else 778 } else if (proc_getflags(dpr->dpr_proc) & PR_KLC) { 779#endif 780 dt_dprintf("killing pid %d\n", (int)dpr->dpr_pid); 781 rflag = PRELEASE_KILL; /* apply kill-on-last-close */ 782 } else { 783 dt_dprintf("releasing pid %d\n", (int)dpr->dpr_pid); 784 rflag = 0; /* apply run-on-last-close */ 785 } 786 787 if (dpr->dpr_tid) { 788 /* 789 * Set the dpr_quit flag to tell the daemon thread to exit. We 790 * send it a SIGCANCEL to poke it out of PCWSTOP or any other 791 * long-term /proc system call. Our daemon threads have POSIX 792 * cancellation disabled, so EINTR will be the only effect. We 793 * then wait for dpr_done to indicate the thread has exited. 794 * 795 * We can't use pthread_kill() to send SIGCANCEL because the 796 * interface forbids it and we can't use pthread_cancel() 797 * because with cancellation disabled it won't actually 798 * send SIGCANCEL to the target thread, so we use _lwp_kill() 799 * to do the job. This is all built on evil knowledge of 800 * the details of the cancellation mechanism in libc. 801 */ 802 (void) pthread_mutex_lock(&dpr->dpr_lock); 803 dpr->dpr_quit = B_TRUE; 804#if defined(sun) 805 (void) _lwp_kill(dpr->dpr_tid, SIGCANCEL); 806#else 807 (void) pthread_kill(dpr->dpr_tid, SIGUSR1); 808#endif 809 810 /* 811 * If the process is currently idling in dt_proc_stop(), re- 812 * enable breakpoints and poke it into running again. 813 */ 814 if (dpr->dpr_stop & DT_PROC_STOP_IDLE) { 815 dt_proc_bpenable(dpr); 816 dpr->dpr_stop &= ~DT_PROC_STOP_IDLE; 817 (void) pthread_cond_broadcast(&dpr->dpr_cv); 818 } 819 820 while (!dpr->dpr_done) 821 (void) pthread_cond_wait(&dpr->dpr_cv, &dpr->dpr_lock); 822 823 (void) pthread_mutex_unlock(&dpr->dpr_lock); 824 } 825 826 /* 827 * Before we free the process structure, remove this dt_proc_t from the 828 * lookup hash, and then walk the dt_proc_hash_t's notification list 829 * and remove this dt_proc_t if it is enqueued. 830 */ 831 (void) pthread_mutex_lock(&dph->dph_lock); 832 (void) dt_proc_lookup(dtp, P, B_TRUE); 833 npp = &dph->dph_notify; 834 835 while ((npr = *npp) != NULL) { 836 if (npr->dprn_dpr == dpr) { 837 *npp = npr->dprn_next; 838 dt_free(dtp, npr); 839 } else { 840 npp = &npr->dprn_next; 841 } 842 } 843 844 (void) pthread_mutex_unlock(&dph->dph_lock); 845 846 /* 847 * Remove the dt_proc_list from the LRU list, release the underlying 848 * libproc handle, and free our dt_proc_t data structure. 849 */ 850 if (dpr->dpr_cacheable) { 851 assert(dph->dph_lrucnt != 0); 852 dph->dph_lrucnt--; 853 } 854 855 dt_list_delete(&dph->dph_lrulist, dpr); 856#if defined(sun) 857 Prelease(dpr->dpr_proc, rflag); 858#else 859 proc_detach(dpr->dpr_proc, rflag); 860#endif 861 dt_free(dtp, dpr); 862} 863 864static int 865dt_proc_create_thread(dtrace_hdl_t *dtp, dt_proc_t *dpr, uint_t stop) 866{ 867 dt_proc_control_data_t data; 868 sigset_t nset, oset; 869 pthread_attr_t a; 870 int err; 871 872 (void) pthread_mutex_lock(&dpr->dpr_lock); 873 dpr->dpr_stop |= stop; /* set bit for initial rendezvous */ 874 875 (void) pthread_attr_init(&a); 876 (void) pthread_attr_setdetachstate(&a, PTHREAD_CREATE_DETACHED); 877 878 (void) sigfillset(&nset); 879 (void) sigdelset(&nset, SIGABRT); /* unblocked for assert() */ 880#if defined(sun) 881 (void) sigdelset(&nset, SIGCANCEL); /* see dt_proc_destroy() */ 882#else 883 (void) sigdelset(&nset, SIGUSR1); /* see dt_proc_destroy() */ 884#endif 885 886 data.dpcd_hdl = dtp; 887 data.dpcd_proc = dpr; 888 889 (void) pthread_sigmask(SIG_SETMASK, &nset, &oset); 890 err = pthread_create(&dpr->dpr_tid, &a, dt_proc_control, &data); 891 (void) pthread_sigmask(SIG_SETMASK, &oset, NULL); 892 893 /* 894 * If the control thread was created, then wait on dpr_cv for either 895 * dpr_done to be set (the victim died or the control thread failed) 896 * or DT_PROC_STOP_IDLE to be set, indicating that the victim is now 897 * stopped by /proc and the control thread is at the rendezvous event. 898 * On success, we return with the process and control thread stopped: 899 * the caller can then apply dt_proc_continue() to resume both. 900 */ 901 if (err == 0) { 902 while (!dpr->dpr_done && !(dpr->dpr_stop & DT_PROC_STOP_IDLE)) 903 (void) pthread_cond_wait(&dpr->dpr_cv, &dpr->dpr_lock); 904 905 /* 906 * If dpr_done is set, the control thread aborted before it 907 * reached the rendezvous event. This is either due to PS_LOST 908 * or PS_UNDEAD (i.e. the process died). We try to provide a 909 * small amount of useful information to help figure it out. 910 */ 911 if (dpr->dpr_done) { 912#if defined(sun) 913 const psinfo_t *prp = Ppsinfo(dpr->dpr_proc); 914 int stat = prp ? prp->pr_wstat : 0; 915#endif 916 int pid = dpr->dpr_pid; 917 918#if defined(sun) 919 if (Pstate(dpr->dpr_proc) == PS_LOST) { 920#else 921 if (proc_state(dpr->dpr_proc) == PS_LOST) { 922#endif 923 (void) dt_proc_error(dpr->dpr_hdl, dpr, 924 "failed to control pid %d: process exec'd " 925 "set-id or unobservable program\n", pid); 926#if defined(sun) 927 } else if (WIFSIGNALED(stat)) { 928 (void) dt_proc_error(dpr->dpr_hdl, dpr, 929 "failed to control pid %d: process died " 930 "from signal %d\n", pid, WTERMSIG(stat)); 931 } else { 932 (void) dt_proc_error(dpr->dpr_hdl, dpr, 933 "failed to control pid %d: process exited " 934 "with status %d\n", pid, WEXITSTATUS(stat)); 935#endif 936 } 937 938 err = ESRCH; /* cause grab() or create() to fail */ 939 } 940 } else { 941 (void) dt_proc_error(dpr->dpr_hdl, dpr, 942 "failed to create control thread for process-id %d: %s\n", 943 (int)dpr->dpr_pid, strerror(err)); 944 } 945 946 (void) pthread_mutex_unlock(&dpr->dpr_lock); 947 (void) pthread_attr_destroy(&a); 948 949 return (err); 950} 951 952struct ps_prochandle * 953dt_proc_create(dtrace_hdl_t *dtp, const char *file, char *const *argv, 954 proc_child_func *pcf, void *child_arg) 955{ 956 dt_proc_hash_t *dph = dtp->dt_procs; 957 dt_proc_t *dpr; 958 int err; 959 960 if ((dpr = dt_zalloc(dtp, sizeof (dt_proc_t))) == NULL) 961 return (NULL); /* errno is set for us */ 962 963 (void) pthread_mutex_init(&dpr->dpr_lock, NULL); 964 (void) pthread_cond_init(&dpr->dpr_cv, NULL); 965 966#if defined(sun) 967 if ((dpr->dpr_proc = Pcreate(file, argv, &err, NULL, 0)) == NULL) { 968 return (dt_proc_error(dtp, dpr, 969 "failed to execute %s: %s\n", file, Pcreate_error(err))); 970 } 971 972 dpr->dpr_hdl = dtp; 973 dpr->dpr_pid = Pstatus(dpr->dpr_proc)->pr_pid; 974 975 (void) Punsetflags(dpr->dpr_proc, PR_RLC); 976 (void) Psetflags(dpr->dpr_proc, PR_KLC); 977#else 978 (void) proc_clearflags(dpr->dpr_proc, PR_RLC); 979 (void) proc_setflags(dpr->dpr_proc, PR_KLC); 980 if ((err = proc_create(file, argv, pcf, child_arg, &dpr->dpr_proc)) != 0) 981 return (dt_proc_error(dtp, dpr, 982 "failed to execute %s: %s\n", file, strerror(err))); 983 dpr->dpr_hdl = dtp; 984 dpr->dpr_pid = proc_getpid(dpr->dpr_proc); 985#endif 986 987#if defined(sun) 988 if (dt_proc_create_thread(dtp, dpr, dtp->dt_prcmode) != 0) 989#else 990 if (dt_proc_create_thread(dtp, dpr, DT_PROC_STOP_IDLE) != 0) 991#endif 992 return (NULL); /* dt_proc_error() has been called for us */ 993 994 dpr->dpr_hash = dph->dph_hash[dpr->dpr_pid & (dph->dph_hashlen - 1)]; 995 dph->dph_hash[dpr->dpr_pid & (dph->dph_hashlen - 1)] = dpr; 996 dt_list_prepend(&dph->dph_lrulist, dpr); 997 998 dt_dprintf("created pid %d\n", (int)dpr->dpr_pid); 999 dpr->dpr_refs++; 1000 1001 return (dpr->dpr_proc); 1002} 1003 1004struct ps_prochandle * 1005dt_proc_grab(dtrace_hdl_t *dtp, pid_t pid, int flags, int nomonitor) 1006{ 1007 dt_proc_hash_t *dph = dtp->dt_procs; 1008 uint_t h = pid & (dph->dph_hashlen - 1); 1009 dt_proc_t *dpr, *opr; 1010 int err; 1011 1012 /* 1013 * Search the hash table for the pid. If it is already grabbed or 1014 * created, move the handle to the front of the lrulist, increment 1015 * the reference count, and return the existing ps_prochandle. 1016 */ 1017 for (dpr = dph->dph_hash[h]; dpr != NULL; dpr = dpr->dpr_hash) { 1018 if (dpr->dpr_pid == pid && !dpr->dpr_stale) { 1019 /* 1020 * If the cached handle was opened read-only and 1021 * this request is for a writeable handle, mark 1022 * the cached handle as stale and open a new handle. 1023 * Since it's stale, unmark it as cacheable. 1024 */ 1025 if (dpr->dpr_rdonly && !(flags & PGRAB_RDONLY)) { 1026 dt_dprintf("upgrading pid %d\n", (int)pid); 1027 dpr->dpr_stale = B_TRUE; 1028 dpr->dpr_cacheable = B_FALSE; 1029 dph->dph_lrucnt--; 1030 break; 1031 } 1032 1033 dt_dprintf("grabbed pid %d (cached)\n", (int)pid); 1034 dt_list_delete(&dph->dph_lrulist, dpr); 1035 dt_list_prepend(&dph->dph_lrulist, dpr); 1036 dpr->dpr_refs++; 1037 return (dpr->dpr_proc); 1038 } 1039 } 1040 1041 if ((dpr = dt_zalloc(dtp, sizeof (dt_proc_t))) == NULL) 1042 return (NULL); /* errno is set for us */ 1043 1044 (void) pthread_mutex_init(&dpr->dpr_lock, NULL); 1045 (void) pthread_cond_init(&dpr->dpr_cv, NULL); 1046 1047#if defined(sun) 1048 if ((dpr->dpr_proc = Pgrab(pid, flags, &err)) == NULL) { 1049 return (dt_proc_error(dtp, dpr, 1050 "failed to grab pid %d: %s\n", (int)pid, Pgrab_error(err))); 1051 } 1052#else 1053 if ((err = proc_attach(pid, flags, &dpr->dpr_proc)) != 0) 1054 return (dt_proc_error(dtp, dpr, 1055 "failed to grab pid %d: %s\n", (int) pid, strerror(err))); 1056#endif 1057 1058 dpr->dpr_hdl = dtp; 1059 dpr->dpr_pid = pid; 1060 1061#if defined(sun) 1062 (void) Punsetflags(dpr->dpr_proc, PR_KLC); 1063 (void) Psetflags(dpr->dpr_proc, PR_RLC); 1064#else 1065 (void) proc_clearflags(dpr->dpr_proc, PR_KLC); 1066 (void) proc_setflags(dpr->dpr_proc, PR_RLC); 1067#endif 1068 1069 /* 1070 * If we are attempting to grab the process without a monitor 1071 * thread, then mark the process cacheable only if it's being 1072 * grabbed read-only. If we're currently caching more process 1073 * handles than dph_lrulim permits, attempt to find the 1074 * least-recently-used handle that is currently unreferenced and 1075 * release it from the cache. Otherwise we are grabbing the process 1076 * for control: create a control thread for this process and store 1077 * its ID in dpr->dpr_tid. 1078 */ 1079 if (nomonitor || (flags & PGRAB_RDONLY)) { 1080 if (dph->dph_lrucnt >= dph->dph_lrulim) { 1081 for (opr = dt_list_prev(&dph->dph_lrulist); 1082 opr != NULL; opr = dt_list_prev(opr)) { 1083 if (opr->dpr_cacheable && opr->dpr_refs == 0) { 1084 dt_proc_destroy(dtp, opr->dpr_proc); 1085 break; 1086 } 1087 } 1088 } 1089 1090 if (flags & PGRAB_RDONLY) { 1091 dpr->dpr_cacheable = B_TRUE; 1092 dpr->dpr_rdonly = B_TRUE; 1093 dph->dph_lrucnt++; 1094 } 1095 1096 } else if (dt_proc_create_thread(dtp, dpr, DT_PROC_STOP_GRAB) != 0) 1097 return (NULL); /* dt_proc_error() has been called for us */ 1098 1099 dpr->dpr_hash = dph->dph_hash[h]; 1100 dph->dph_hash[h] = dpr; 1101 dt_list_prepend(&dph->dph_lrulist, dpr); 1102 1103 dt_dprintf("grabbed pid %d\n", (int)pid); 1104 dpr->dpr_refs++; 1105 1106 return (dpr->dpr_proc); 1107} 1108 1109void 1110dt_proc_release(dtrace_hdl_t *dtp, struct ps_prochandle *P) 1111{ 1112 dt_proc_t *dpr = dt_proc_lookup(dtp, P, B_FALSE); 1113 dt_proc_hash_t *dph = dtp->dt_procs; 1114 1115 assert(dpr != NULL); 1116 assert(dpr->dpr_refs != 0); 1117 1118 if (--dpr->dpr_refs == 0 && 1119 (!dpr->dpr_cacheable || dph->dph_lrucnt > dph->dph_lrulim)) 1120 dt_proc_destroy(dtp, P); 1121} 1122 1123void 1124dt_proc_continue(dtrace_hdl_t *dtp, struct ps_prochandle *P) 1125{ 1126 dt_proc_t *dpr = dt_proc_lookup(dtp, P, B_FALSE); 1127 1128 (void) pthread_mutex_lock(&dpr->dpr_lock); 1129 1130 if (dpr->dpr_stop & DT_PROC_STOP_IDLE) { 1131 dpr->dpr_stop &= ~DT_PROC_STOP_IDLE; 1132 (void) pthread_cond_broadcast(&dpr->dpr_cv); 1133 } 1134 1135 (void) pthread_mutex_unlock(&dpr->dpr_lock); 1136} 1137 1138void 1139dt_proc_lock(dtrace_hdl_t *dtp, struct ps_prochandle *P) 1140{ 1141 dt_proc_t *dpr = dt_proc_lookup(dtp, P, B_FALSE); 1142 int err = pthread_mutex_lock(&dpr->dpr_lock); 1143 assert(err == 0); /* check for recursion */ 1144} 1145 1146void 1147dt_proc_unlock(dtrace_hdl_t *dtp, struct ps_prochandle *P) 1148{ 1149 dt_proc_t *dpr = dt_proc_lookup(dtp, P, B_FALSE); 1150 int err = pthread_mutex_unlock(&dpr->dpr_lock); 1151 assert(err == 0); /* check for unheld lock */ 1152} 1153 1154void 1155dt_proc_hash_create(dtrace_hdl_t *dtp) 1156{ 1157 if ((dtp->dt_procs = dt_zalloc(dtp, sizeof (dt_proc_hash_t) + 1158 sizeof (dt_proc_t *) * _dtrace_pidbuckets - 1)) != NULL) { 1159 1160 (void) pthread_mutex_init(&dtp->dt_procs->dph_lock, NULL); 1161 (void) pthread_cond_init(&dtp->dt_procs->dph_cv, NULL); 1162 1163 dtp->dt_procs->dph_hashlen = _dtrace_pidbuckets; 1164 dtp->dt_procs->dph_lrulim = _dtrace_pidlrulim; 1165 } 1166} 1167 1168void 1169dt_proc_hash_destroy(dtrace_hdl_t *dtp) 1170{ 1171 dt_proc_hash_t *dph = dtp->dt_procs; 1172 dt_proc_t *dpr; 1173 1174 while ((dpr = dt_list_next(&dph->dph_lrulist)) != NULL) 1175 dt_proc_destroy(dtp, dpr->dpr_proc); 1176 1177 dtp->dt_procs = NULL; 1178 dt_free(dtp, dph); 1179} 1180 1181struct ps_prochandle * 1182dtrace_proc_create(dtrace_hdl_t *dtp, const char *file, char *const *argv, 1183 proc_child_func *pcf, void *child_arg) 1184{ 1185 dt_ident_t *idp = dt_idhash_lookup(dtp->dt_macros, "target"); 1186 struct ps_prochandle *P = dt_proc_create(dtp, file, argv, pcf, child_arg); 1187 1188 if (P != NULL && idp != NULL && idp->di_id == 0) 1189#if defined(sun) 1190 idp->di_id = Pstatus(P)->pr_pid; /* $target = created pid */ 1191#else 1192 idp->di_id = proc_getpid(P); /* $target = created pid */ 1193#endif 1194 1195 return (P); 1196} 1197 1198struct ps_prochandle * 1199dtrace_proc_grab(dtrace_hdl_t *dtp, pid_t pid, int flags) 1200{ 1201 dt_ident_t *idp = dt_idhash_lookup(dtp->dt_macros, "target"); 1202 struct ps_prochandle *P = dt_proc_grab(dtp, pid, flags, 0); 1203 1204 if (P != NULL && idp != NULL && idp->di_id == 0) 1205 idp->di_id = pid; /* $target = grabbed pid */ 1206 1207 return (P); 1208} 1209 1210void 1211dtrace_proc_release(dtrace_hdl_t *dtp, struct ps_prochandle *P) 1212{ 1213 dt_proc_release(dtp, P); 1214} 1215 1216void 1217dtrace_proc_continue(dtrace_hdl_t *dtp, struct ps_prochandle *P) 1218{ 1219 dt_proc_continue(dtp, P); 1220} 1221