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/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <pthread.h>
#include <inttypes.h>
#include <stdio.h>
#include <sys/resource.h>
#include <unistd.h>
#include "private/bionic_string_utils.h"
#include "private/ErrnoRestorer.h"
#include "private/libc_logging.h"
#include "pthread_internal.h"
int pthread_attr_init(pthread_attr_t* attr) {
attr->flags = 0;
attr->stack_base = NULL;
attr->stack_size = PTHREAD_STACK_SIZE_DEFAULT;
attr->guard_size = PAGE_SIZE;
attr->sched_policy = SCHED_NORMAL;
attr->sched_priority = 0;
return 0;
}
int pthread_attr_destroy(pthread_attr_t* attr) {
memset(attr, 0x42, sizeof(pthread_attr_t));
return 0;
}
int pthread_attr_setdetachstate(pthread_attr_t* attr, int state) {
if (state == PTHREAD_CREATE_DETACHED) {
attr->flags |= PTHREAD_ATTR_FLAG_DETACHED;
} else if (state == PTHREAD_CREATE_JOINABLE) {
attr->flags &= ~PTHREAD_ATTR_FLAG_DETACHED;
} else {
return EINVAL;
}
return 0;
}
int pthread_attr_getdetachstate(const pthread_attr_t* attr, int* state) {
*state = (attr->flags & PTHREAD_ATTR_FLAG_DETACHED) ? PTHREAD_CREATE_DETACHED : PTHREAD_CREATE_JOINABLE;
return 0;
}
int pthread_attr_setschedpolicy(pthread_attr_t* attr, int policy) {
attr->sched_policy = policy;
return 0;
}
int pthread_attr_getschedpolicy(const pthread_attr_t* attr, int* policy) {
*policy = attr->sched_policy;
return 0;
}
int pthread_attr_setschedparam(pthread_attr_t* attr, const sched_param* param) {
attr->sched_priority = param->sched_priority;
return 0;
}
int pthread_attr_getschedparam(const pthread_attr_t* attr, sched_param* param) {
param->sched_priority = attr->sched_priority;
return 0;
}
int pthread_attr_setstacksize(pthread_attr_t* attr, size_t stack_size) {
if (stack_size < PTHREAD_STACK_MIN) {
return EINVAL;
}
attr->stack_size = stack_size;
return 0;
}
int pthread_attr_getstacksize(const pthread_attr_t* attr, size_t* stack_size) {
void* unused;
return pthread_attr_getstack(attr, &unused, stack_size);
}
int pthread_attr_setstack(pthread_attr_t* attr, void* stack_base, size_t stack_size) {
if ((stack_size & (PAGE_SIZE - 1) || stack_size < PTHREAD_STACK_MIN)) {
return EINVAL;
}
if (reinterpret_cast<uintptr_t>(stack_base) & (PAGE_SIZE - 1)) {
return EINVAL;
}
attr->stack_base = stack_base;
attr->stack_size = stack_size;
return 0;
}
static int __pthread_attr_getstack_main_thread(void** stack_base, size_t* stack_size) {
ErrnoRestorer errno_restorer;
rlimit stack_limit;
if (getrlimit(RLIMIT_STACK, &stack_limit) == -1) {
return errno;
}
// If the current RLIMIT_STACK is RLIM_INFINITY, only admit to an 8MiB stack for sanity's sake.
if (stack_limit.rlim_cur == RLIM_INFINITY) {
stack_limit.rlim_cur = 8 * 1024 * 1024;
}
// It shouldn't matter which thread we are because we're just looking for "[stack]", but
// valgrind seems to mess with the stack enough that the kernel will report "[stack:pid]"
// instead if you look in /proc/self/maps, so we need to look in /proc/pid/task/pid/maps.
char path[64];
snprintf(path, sizeof(path), "/proc/self/task/%d/maps", getpid());
FILE* fp = fopen(path, "re");
if (fp == NULL) {
return errno;
}
char line[BUFSIZ];
while (fgets(line, sizeof(line), fp) != NULL) {
if (ends_with(line, " [stack]\n")) {
uintptr_t lo, hi;
if (sscanf(line, "%" SCNxPTR "-%" SCNxPTR, &lo, &hi) == 2) {
*stack_size = stack_limit.rlim_cur;
*stack_base = reinterpret_cast<void*>(hi - *stack_size);
fclose(fp);
return 0;
}
}
}
__libc_fatal("No [stack] line found in \"%s\"!", path);
}
int pthread_attr_getstack(const pthread_attr_t* attr, void** stack_base, size_t* stack_size) {
if ((attr->flags & PTHREAD_ATTR_FLAG_MAIN_THREAD) != 0) {
return __pthread_attr_getstack_main_thread(stack_base, stack_size);
}
*stack_base = attr->stack_base;
*stack_size = attr->stack_size;
return 0;
}
int pthread_attr_setguardsize(pthread_attr_t* attr, size_t guard_size) {
attr->guard_size = guard_size;
return 0;
}
int pthread_attr_getguardsize(const pthread_attr_t* attr, size_t* guard_size) {
*guard_size = attr->guard_size;
return 0;
}
int pthread_getattr_np(pthread_t t, pthread_attr_t* attr) {
*attr = reinterpret_cast<pthread_internal_t*>(t)->attr;
return 0;
}
int pthread_attr_setscope(pthread_attr_t*, int scope) {
if (scope == PTHREAD_SCOPE_SYSTEM) {
return 0;
}
if (scope == PTHREAD_SCOPE_PROCESS) {
return ENOTSUP;
}
return EINVAL;
}
int pthread_attr_getscope(const pthread_attr_t*, int* scope) {
*scope = PTHREAD_SCOPE_SYSTEM;
return 0;
}
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