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// Copyright 2019 The TCMalloc Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "tcmalloc/page_allocator_interface.h"
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include "tcmalloc/internal/environment.h"
#include "tcmalloc/internal/logging.h"
#include "tcmalloc/internal/optimization.h"
#include "tcmalloc/internal/util.h"
#include "tcmalloc/static_vars.h"
GOOGLE_MALLOC_SECTION_BEGIN
namespace tcmalloc {
namespace tcmalloc_internal {
static int OpenLog(MemoryTag tag) {
const char *fname = [&]() {
switch (tag) {
case MemoryTag::kNormal:
return thread_safe_getenv("TCMALLOC_PAGE_LOG_FILE");
case MemoryTag::kNormalP1:
return thread_safe_getenv("TCMALLOC_PAGE_LOG_FILE_P1");
case MemoryTag::kSampled:
return thread_safe_getenv("TCMALLOC_SAMPLED_PAGE_LOG_FILE");
default:
ASSUME(false);
__builtin_unreachable();
}
}();
if (ABSL_PREDICT_TRUE(!fname)) return -1;
if (getuid() != geteuid() || getgid() != getegid()) {
Log(kLog, __FILE__, __LINE__, "Cannot take a pagetrace from setuid binary");
return -1;
}
char buf[PATH_MAX];
// Tag file with PID - handles forking children much better.
int pid = getpid();
// Blaze tests can output here for recovery of the output file
const char *test_dir = thread_safe_getenv("TEST_UNDECLARED_OUTPUTS_DIR");
if (test_dir) {
snprintf(buf, sizeof(buf), "%s/%s.%d", test_dir, fname, pid);
} else {
snprintf(buf, sizeof(buf), "%s.%d", fname, pid);
}
int fd =
signal_safe_open(buf, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
if (fd < 0) {
Crash(kCrash, __FILE__, __LINE__, fd, errno, fname);
}
return fd;
}
PageAllocatorInterface::PageAllocatorInterface(const char *label, MemoryTag tag)
: PageAllocatorInterface(label, &Static::pagemap(), tag) {}
PageAllocatorInterface::PageAllocatorInterface(const char *label, PageMap *map,
MemoryTag tag)
: info_(label, OpenLog(tag)), pagemap_(map), tag_(tag) {}
PageAllocatorInterface::~PageAllocatorInterface() {
// This is part of tcmalloc statics - they must be immortal.
Crash(kCrash, __FILE__, __LINE__, "should never destroy this");
}
} // namespace tcmalloc_internal
} // namespace tcmalloc
GOOGLE_MALLOC_SECTION_END
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