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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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
*
* http://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 <fcntl.h>
#include <inttypes.h>
#include <string.h>
#include <unistd.h>
#include <android-base/unique_fd.h>
#include "LineBuffer.h"
#include "ProcessMappings.h"
#include "log.h"
namespace android {
// This function is not re-entrant since it uses a static buffer for
// the line data.
bool ProcessMappings(pid_t pid, allocator::vector<Mapping>& mappings) {
char map_buffer[1024];
snprintf(map_buffer, sizeof(map_buffer), "/proc/%d/maps", pid);
android::base::unique_fd fd(open(map_buffer, O_RDONLY));
if (fd == -1) {
return false;
}
LineBuffer line_buf(fd, map_buffer, sizeof(map_buffer));
char* line;
size_t line_len;
while (line_buf.GetLine(&line, &line_len)) {
int name_pos;
char perms[5];
Mapping mapping{};
if (sscanf(line, "%" SCNxPTR "-%" SCNxPTR " %4s %*x %*x:%*x %*d %n", &mapping.begin,
&mapping.end, perms, &name_pos) == 3) {
if (perms[0] == 'r') {
mapping.read = true;
}
if (perms[1] == 'w') {
mapping.write = true;
}
if (perms[2] == 'x') {
mapping.execute = true;
}
if (perms[3] == 'p') {
mapping.priv = true;
}
if ((size_t)name_pos < line_len) {
strlcpy(mapping.name, line + name_pos, sizeof(mapping.name));
}
mappings.emplace_back(mapping);
}
}
return true;
}
} // namespace android
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