1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <fcntl.h> 18 #include <inttypes.h> 19 #include <string.h> 20 #include <unistd.h> 21 22 #include <android-base/unique_fd.h> 23 24 #include "LineBuffer.h" 25 #include "ProcessMappings.h" 26 #include "log.h" 27 28 namespace android { 29 30 // This function is not re-entrant since it uses a static buffer for 31 // the line data. 32 bool ProcessMappings(pid_t pid, allocator::vector<Mapping>& mappings) { 33 char map_buffer[1024]; 34 snprintf(map_buffer, sizeof(map_buffer), "/proc/%d/maps", pid); 35 android::base::unique_fd fd(open(map_buffer, O_RDONLY)); 36 if (fd == -1) { 37 return false; 38 } 39 40 LineBuffer line_buf(fd, map_buffer, sizeof(map_buffer)); 41 char* line; 42 size_t line_len; 43 while (line_buf.GetLine(&line, &line_len)) { 44 int name_pos; 45 char perms[5]; 46 Mapping mapping{}; 47 if (sscanf(line, "%" SCNxPTR "-%" SCNxPTR " %4s %*x %*x:%*x %*d %n", &mapping.begin, 48 &mapping.end, perms, &name_pos) == 3) { 49 if (perms[0] == 'r') { 50 mapping.read = true; 51 } 52 if (perms[1] == 'w') { 53 mapping.write = true; 54 } 55 if (perms[2] == 'x') { 56 mapping.execute = true; 57 } 58 if (perms[3] == 'p') { 59 mapping.priv = true; 60 } 61 if ((size_t)name_pos < line_len) { 62 strlcpy(mapping.name, line + name_pos, sizeof(mapping.name)); 63 } 64 mappings.emplace_back(mapping); 65 } 66 } 67 return true; 68 } 69 70 } // namespace android 71
