300 "environment on Linux when /proc filesystem is not mounted.";
301
302 void os::Linux::initialize_system_info() {
303 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
304 if (processor_count() == 1) {
305 pid_t pid = os::Linux::gettid();
306 char fname[32];
307 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid);
308 FILE *fp = fopen(fname, "r");
309 if (fp == NULL) {
310 unsafe_chroot_detected = true;
311 } else {
312 fclose(fp);
313 }
314 }
315 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
316 assert(processor_count() > 0, "linux error");
317 }
318
319 void os::init_system_properties_values() {
320 // char arch[12];
321 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
322
323 // The next steps are taken in the product version:
324 //
325 // Obtain the JAVA_HOME value from the location of libjvm.so.
326 // This library should be located at:
327 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
328 //
329 // If "/jre/lib/" appears at the right place in the path, then we
330 // assume libjvm.so is installed in a JDK and we use this path.
331 //
332 // Otherwise exit with message: "Could not create the Java virtual machine."
333 //
334 // The following extra steps are taken in the debugging version:
335 //
336 // If "/jre/lib/" does NOT appear at the right place in the path
337 // instead of exit check for $JAVA_HOME environment variable.
338 //
339 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
340 // then we append a fake suffix "hotspot/libjvm.so" to this path so
341 // it looks like libjvm.so is installed there
342 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
343 //
344 // Otherwise exit.
345 //
346 // Important note: if the location of libjvm.so changes this
347 // code needs to be changed accordingly.
348
349 // The next few definitions allow the code to be verbatim:
350 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal)
351 #define getenv(n) ::getenv(n)
352
353 /*
354 * See ld(1):
355 * The linker uses the following search paths to locate required
356 * shared libraries:
357 * 1: ...
358 * ...
359 * 7: The default directories, normally /lib and /usr/lib.
360 */
361 #if defined(AMD64) || defined(_LP64) && (defined(SPARC) || defined(PPC) || defined(S390))
362 #define DEFAULT_LIBPATH "/usr/lib64:/lib64:/lib:/usr/lib"
363 #else
364 #define DEFAULT_LIBPATH "/lib:/usr/lib"
365 #endif
366
367 #define EXTENSIONS_DIR "/lib/ext"
368 #define ENDORSED_DIR "/lib/endorsed"
369 #define REG_DIR "/usr/java/packages"
370
371 {
372 /* sysclasspath, java_home, dll_dir */
373 {
374 char *home_path;
375 char *dll_path;
376 char *pslash;
377 char buf[MAXPATHLEN];
378 os::jvm_path(buf, sizeof(buf));
379
380 // Found the full path to libjvm.so.
381 // Now cut the path to <java_home>/jre if we can.
382 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */
383 pslash = strrchr(buf, '/');
384 if (pslash != NULL)
385 *pslash = '\0'; /* get rid of /{client|server|hotspot} */
386 dll_path = malloc(strlen(buf) + 1);
387 if (dll_path == NULL)
388 return;
389 strcpy(dll_path, buf);
390 Arguments::set_dll_dir(dll_path);
391
392 if (pslash != NULL) {
393 pslash = strrchr(buf, '/');
394 if (pslash != NULL) {
395 *pslash = '\0'; /* get rid of /<arch> */
396 pslash = strrchr(buf, '/');
397 if (pslash != NULL)
398 *pslash = '\0'; /* get rid of /lib */
399 }
400 }
401
402 home_path = malloc(strlen(buf) + 1);
403 if (home_path == NULL)
404 return;
405 strcpy(home_path, buf);
406 Arguments::set_java_home(home_path);
407
408 if (!set_boot_path('/', ':'))
409 return;
410 }
411
412 /*
413 * Where to look for native libraries
414 *
415 * Note: Due to a legacy implementation, most of the library path
416 * is set in the launcher. This was to accomodate linking restrictions
417 * on legacy Linux implementations (which are no longer supported).
418 * Eventually, all the library path setting will be done here.
419 *
420 * However, to prevent the proliferation of improperly built native
421 * libraries, the new path component /usr/java/packages is added here.
422 * Eventually, all the library path setting will be done here.
423 */
424 {
425 char *ld_library_path;
426
427 /*
428 * Construct the invariant part of ld_library_path. Note that the
429 * space for the colon and the trailing null are provided by the
430 * nulls included by the sizeof operator (so actually we allocate
431 * a byte more than necessary).
432 */
433 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") +
434 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH));
435 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch);
436
437 /*
438 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It
439 * should always exist (until the legacy problem cited above is
440 * addressed).
441 */
442 char *v = getenv("LD_LIBRARY_PATH");
443 if (v != NULL) {
444 char *t = ld_library_path;
445 /* That's +1 for the colon and +1 for the trailing '\0' */
446 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1);
447 sprintf(ld_library_path, "%s:%s", v, t);
448 }
449 Arguments::set_library_path(ld_library_path);
450 }
451
452 /*
453 * Extensions directories.
454 *
455 * Note that the space for the colon and the trailing null are provided
456 * by the nulls included by the sizeof operator (so actually one byte more
457 * than necessary is allocated).
458 */
459 {
460 char *buf = malloc(strlen(Arguments::get_java_home()) +
461 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR));
462 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR,
463 Arguments::get_java_home());
464 Arguments::set_ext_dirs(buf);
465 }
466
467 /* Endorsed standards default directory. */
468 {
469 char * buf;
470 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
471 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
472 Arguments::set_endorsed_dirs(buf);
473 }
474 }
475
476 #undef malloc
477 #undef getenv
478 #undef EXTENSIONS_DIR
479 #undef ENDORSED_DIR
480
481 // Done
482 return;
483 }
484
485 ////////////////////////////////////////////////////////////////////////////////
486 // breakpoint support
487
488 void os::breakpoint() {
489 BREAKPOINT;
490 }
491
492 extern "C" void breakpoint() {
493 // use debugger to set breakpoint here
494 }
495
496 ////////////////////////////////////////////////////////////////////////////////
497 // signal support
498
499 debug_only(static bool signal_sets_initialized = false);
500 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
501
502 bool os::Linux::is_sig_ignored(int sig) {
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300 "environment on Linux when /proc filesystem is not mounted.";
301
302 void os::Linux::initialize_system_info() {
303 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
304 if (processor_count() == 1) {
305 pid_t pid = os::Linux::gettid();
306 char fname[32];
307 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid);
308 FILE *fp = fopen(fname, "r");
309 if (fp == NULL) {
310 unsafe_chroot_detected = true;
311 } else {
312 fclose(fp);
313 }
314 }
315 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
316 assert(processor_count() > 0, "linux error");
317 }
318
319 void os::init_system_properties_values() {
320 // The next steps are taken in the product version:
321 //
322 // Obtain the JAVA_HOME value from the location of libjvm.so.
323 // This library should be located at:
324 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
325 //
326 // If "/jre/lib/" appears at the right place in the path, then we
327 // assume libjvm.so is installed in a JDK and we use this path.
328 //
329 // Otherwise exit with message: "Could not create the Java virtual machine."
330 //
331 // The following extra steps are taken in the debugging version:
332 //
333 // If "/jre/lib/" does NOT appear at the right place in the path
334 // instead of exit check for $JAVA_HOME environment variable.
335 //
336 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
337 // then we append a fake suffix "hotspot/libjvm.so" to this path so
338 // it looks like libjvm.so is installed there
339 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
340 //
341 // Otherwise exit.
342 //
343 // Important note: if the location of libjvm.so changes this
344 // code needs to be changed accordingly.
345
346 // See ld(1):
347 // The linker uses the following search paths to locate required
348 // shared libraries:
349 // 1: ...
350 // ...
351 // 7: The default directories, normally /lib and /usr/lib.
352 #if defined(AMD64) || defined(_LP64) && (defined(SPARC) || defined(PPC) || defined(S390))
353 #define DEFAULT_LIBPATH "/usr/lib64:/lib64:/lib:/usr/lib"
354 #else
355 #define DEFAULT_LIBPATH "/lib:/usr/lib"
356 #endif
357
358 // Base path of extensions installed on the system.
359 #define SYS_EXT_DIR "/usr/java/packages"
360 #define EXTENSIONS_DIR "/lib/ext"
361 #define ENDORSED_DIR "/lib/endorsed"
362
363 // Buffer that fits several sprintfs.
364 // Note that the space for the colon and the trailing null are provided
365 // by the nulls included by the sizeof operator.
366 const size_t bufsize =
367 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
368 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR), // extensions dir
369 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir
370 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
371
372 // sysclasspath, java_home, dll_dir
373 {
374 char *pslash;
375 os::jvm_path(buf, bufsize);
376
377 // Found the full path to libjvm.so.
378 // Now cut the path to <java_home>/jre if we can.
379 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
380 pslash = strrchr(buf, '/');
381 if (pslash != NULL) {
382 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
383 }
384 Arguments::set_dll_dir(buf);
385
386 if (pslash != NULL) {
387 pslash = strrchr(buf, '/');
388 if (pslash != NULL) {
389 *pslash = '\0'; // Get rid of /<arch>.
390 pslash = strrchr(buf, '/');
391 if (pslash != NULL) {
392 *pslash = '\0'; // Get rid of /lib.
393 }
394 }
395 }
396 Arguments::set_java_home(buf);
397 set_boot_path('/', ':');
398 }
399
400 // Where to look for native libraries.
401 //
402 // Note: Due to a legacy implementation, most of the library path
403 // is set in the launcher. This was to accomodate linking restrictions
404 // on legacy Linux implementations (which are no longer supported).
405 // Eventually, all the library path setting will be done here.
406 //
407 // However, to prevent the proliferation of improperly built native
408 // libraries, the new path component /usr/java/packages is added here.
409 // Eventually, all the library path setting will be done here.
410 {
411 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It
412 // should always exist (until the legacy problem cited above is
413 // addressed).
414 char *v = ::getenv("LD_LIBRARY_PATH");
415 const char *v_colon = ":";
416 if (v == NULL) { v = ""; v_colon = ""; }
417 // That's +1 for the colon and +1 for the trailing '\0'.
418 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char,
419 strlen(v) + 1 +
420 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1,
421 mtInternal);
422 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch);
423 Arguments::set_library_path(ld_library_path);
424 FREE_C_HEAP_ARRAY(char, ld_library_path, mtInternal);
425 }
426
427 // Extensions directories.
428 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
429 Arguments::set_ext_dirs(buf);
430
431 // Endorsed standards default directory.
432 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
433 Arguments::set_endorsed_dirs(buf);
434
435 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
436
437 #undef DEFAULT_LIBPATH
438 #undef SYS_EXT_DIR
439 #undef EXTENSIONS_DIR
440 #undef ENDORSED_DIR
441 }
442
443 ////////////////////////////////////////////////////////////////////////////////
444 // breakpoint support
445
446 void os::breakpoint() {
447 BREAKPOINT;
448 }
449
450 extern "C" void breakpoint() {
451 // use debugger to set breakpoint here
452 }
453
454 ////////////////////////////////////////////////////////////////////////////////
455 // signal support
456
457 debug_only(static bool signal_sets_initialized = false);
458 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
459
460 bool os::Linux::is_sig_ignored(int sig) {
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