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- /* Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
- #include <assert.h>
- #include <errno.h>
- #include <inttypes.h>
- #include <stdio.h>
- #include <stdio_ext.h>
- #include <stdlib.h>
- #include <string.h>
- #include <sys/resource.h>
- #include "pthreadP.h"
- #include <lowlevellock.h>
- #include <ldsodefs.h>
- int
- pthread_getattr_np (
- pthread_t thread_id,
- pthread_attr_t *attr)
- {
- struct pthread *thread = (struct pthread *) thread_id;
- struct pthread_attr *iattr = (struct pthread_attr *) attr;
- int ret = 0;
- lll_lock (thread->lock, LLL_PRIVATE);
- /* The thread library is responsible for keeping the values in the
- thread desriptor up-to-date in case the user changes them. */
- memcpy (&iattr->schedparam, &thread->schedparam,
- sizeof (struct sched_param));
- iattr->schedpolicy = thread->schedpolicy;
- /* Clear the flags work. */
- iattr->flags = thread->flags;
- /* The thread might be detached by now. */
- if (IS_DETACHED (thread))
- iattr->flags |= ATTR_FLAG_DETACHSTATE;
- /* This is the guardsize after adjusting it. */
- iattr->guardsize = thread->reported_guardsize;
- /* The sizes are subject to alignment. */
- if (__builtin_expect (thread->stackblock != NULL, 1))
- {
- iattr->stacksize = thread->stackblock_size;
- iattr->stackaddr = (char *) thread->stackblock + iattr->stacksize;
- }
- else
- {
- /* No stack information available. This must be for the initial
- thread. Get the info in some magical way. */
- assert (abs (thread->pid) == thread->tid);
- /* Stack size limit. */
- struct rlimit rl;
- /* The safest way to get the top of the stack is to read
- /proc/self/maps and locate the line into which
- __libc_stack_end falls. */
- FILE *fp = fopen ("/proc/self/maps", "rc");
- if (fp == NULL)
- ret = errno;
- /* We need the limit of the stack in any case. */
- else
- {
- if (getrlimit (RLIMIT_STACK, &rl) != 0)
- ret = errno;
- else
- {
- /* We need no locking. */
- __fsetlocking (fp, FSETLOCKING_BYCALLER);
- /* Until we found an entry (which should always be the case)
- mark the result as a failure. */
- ret = ENOENT;
- char *line = NULL;
- size_t linelen = 0;
- uintptr_t last_to = 0;
- while (! feof_unlocked (fp))
- {
- if (getdelim (&line, &linelen, '\n', fp) <= 0)
- break;
- uintptr_t from;
- uintptr_t to;
- if (sscanf (line, "%" SCNxPTR "-%" SCNxPTR, &from, &to) != 2)
- continue;
- if (from <= (uintptr_t) __libc_stack_end
- && (uintptr_t) __libc_stack_end < to)
- {
- /* Found the entry. Now we have the info we need. */
- iattr->stacksize = rl.rlim_cur;
- iattr->stackaddr = (void *) to;
- /* The limit might be too high. */
- if ((size_t) iattr->stacksize
- > (size_t) iattr->stackaddr - last_to)
- iattr->stacksize = (size_t) iattr->stackaddr - last_to;
- /* We succeed and no need to look further. */
- ret = 0;
- break;
- }
- last_to = to;
- }
- free (line);
- }
- fclose (fp);
- }
- }
- iattr->flags |= ATTR_FLAG_STACKADDR;
- if (ret == 0)
- {
- size_t size = 16;
- cpu_set_t *cpuset = NULL;
- do
- {
- size <<= 1;
- void *newp = realloc (cpuset, size);
- if (newp == NULL)
- {
- ret = ENOMEM;
- break;
- }
- cpuset = (cpu_set_t *) newp;
- ret = __pthread_getaffinity_np (thread_id, size, cpuset);
- }
- /* Pick some ridiculous upper limit. Is 8 million CPUs enough? */
- while (ret == EINVAL && size < 1024 * 1024);
- if (ret == 0)
- {
- iattr->cpuset = cpuset;
- iattr->cpusetsize = size;
- }
- else
- {
- free (cpuset);
- if (ret == ENOSYS)
- {
- /* There is no such functionality. */
- ret = 0;
- iattr->cpuset = NULL;
- iattr->cpusetsize = 0;
- }
- }
- }
- lll_unlock (thread->lock, LLL_PRIVATE);
- return ret;
- }
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