The Android Open Source Project | e16cb84 | 2009-03-03 19:32:58 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 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 <dirent.h> |
| 18 | #include <errno.h> |
| 19 | #include <fcntl.h> |
| 20 | #include <stdint.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <sys/stat.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <unistd.h> |
| 25 | |
| 26 | #include <pagemap/pagemap.h> |
| 27 | |
| 28 | int pm_kernel_create(pm_kernel_t **ker_out) { |
| 29 | pm_kernel_t *ker; |
| 30 | int error; |
| 31 | |
| 32 | if (!ker_out) |
| 33 | return 1; |
| 34 | |
| 35 | ker = calloc(1, sizeof(*ker)); |
| 36 | if (!ker) |
| 37 | return errno; |
| 38 | |
| 39 | ker->kpagecount_fd = open("/proc/kpagecount", O_RDONLY); |
| 40 | if (ker->kpagecount_fd < 0) { |
| 41 | error = errno; |
| 42 | free(ker); |
| 43 | return error; |
| 44 | } |
| 45 | |
| 46 | ker->kpageflags_fd = open("/proc/kpageflags", O_RDONLY); |
| 47 | if (ker->kpageflags_fd < 0) { |
| 48 | error = errno; |
| 49 | close(ker->kpagecount_fd); |
| 50 | free(ker); |
| 51 | return error; |
| 52 | } |
| 53 | |
| 54 | ker->pagesize = getpagesize(); |
| 55 | |
| 56 | *ker_out = ker; |
| 57 | |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | #define INIT_PIDS 20 |
| 62 | int pm_kernel_pids(pm_kernel_t *ker, pid_t **pids_out, size_t *len) { |
| 63 | DIR *proc; |
| 64 | struct dirent *dir; |
| 65 | pid_t pid, *pids, *new_pids; |
| 66 | size_t pids_count, pids_size; |
| 67 | int error; |
| 68 | |
| 69 | proc = opendir("/proc"); |
| 70 | if (!proc) |
| 71 | return errno; |
| 72 | |
| 73 | pids = malloc(INIT_PIDS * sizeof(pid_t)); |
| 74 | if (!pids) { |
| 75 | closedir(proc); |
| 76 | return errno; |
| 77 | } |
| 78 | pids_count = 0; pids_size = INIT_PIDS; |
| 79 | |
| 80 | while ((dir = readdir(proc))) { |
| 81 | if (sscanf(dir->d_name, "%d", &pid) < 1) |
| 82 | continue; |
| 83 | |
| 84 | if (pids_count >= pids_size) { |
| 85 | new_pids = realloc(pids, 2 * pids_size * sizeof(pid_t)); |
| 86 | if (!new_pids) { |
| 87 | error = errno; |
| 88 | free(pids); |
| 89 | closedir(proc); |
| 90 | return error; |
| 91 | } |
| 92 | pids = new_pids; |
| 93 | pids_size = 2 * pids_size; |
| 94 | } |
| 95 | |
| 96 | pids[pids_count] = pid; |
| 97 | |
| 98 | pids_count++; |
| 99 | } |
| 100 | |
| 101 | closedir(proc); |
| 102 | |
| 103 | new_pids = realloc(pids, pids_count * sizeof(pid_t)); |
| 104 | if (!new_pids) { |
| 105 | error = errno; |
| 106 | free(pids); |
| 107 | return error; |
| 108 | } |
| 109 | |
| 110 | *pids_out = new_pids; |
| 111 | *len = pids_count; |
| 112 | |
| 113 | return 0; |
| 114 | } |
| 115 | |
Colin Cross | e2998ff | 2014-06-17 14:37:06 -0700 | [diff] [blame^] | 116 | int pm_kernel_count(pm_kernel_t *ker, uint64_t pfn, uint64_t *count_out) { |
| 117 | off64_t off; |
The Android Open Source Project | e16cb84 | 2009-03-03 19:32:58 -0800 | [diff] [blame] | 118 | |
| 119 | if (!ker || !count_out) |
| 120 | return -1; |
| 121 | |
Colin Cross | e2998ff | 2014-06-17 14:37:06 -0700 | [diff] [blame^] | 122 | off = lseek64(ker->kpagecount_fd, pfn * sizeof(uint64_t), SEEK_SET); |
The Android Open Source Project | e16cb84 | 2009-03-03 19:32:58 -0800 | [diff] [blame] | 123 | if (off == (off_t)-1) |
| 124 | return errno; |
| 125 | if (read(ker->kpagecount_fd, count_out, sizeof(uint64_t)) < |
| 126 | (ssize_t)sizeof(uint64_t)) |
| 127 | return errno; |
| 128 | |
| 129 | return 0; |
| 130 | } |
| 131 | |
Colin Cross | e2998ff | 2014-06-17 14:37:06 -0700 | [diff] [blame^] | 132 | int pm_kernel_flags(pm_kernel_t *ker, uint64_t pfn, uint64_t *flags_out) { |
| 133 | off64_t off; |
The Android Open Source Project | e16cb84 | 2009-03-03 19:32:58 -0800 | [diff] [blame] | 134 | |
| 135 | if (!ker || !flags_out) |
| 136 | return -1; |
| 137 | |
Colin Cross | e2998ff | 2014-06-17 14:37:06 -0700 | [diff] [blame^] | 138 | off = lseek64(ker->kpageflags_fd, pfn * sizeof(uint64_t), SEEK_SET); |
The Android Open Source Project | e16cb84 | 2009-03-03 19:32:58 -0800 | [diff] [blame] | 139 | if (off == (off_t)-1) |
| 140 | return errno; |
| 141 | if (read(ker->kpageflags_fd, flags_out, sizeof(uint64_t)) < |
| 142 | (ssize_t)sizeof(uint64_t)) |
| 143 | return errno; |
| 144 | |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | int pm_kernel_destroy(pm_kernel_t *ker) { |
| 149 | if (!ker) |
| 150 | return -1; |
| 151 | |
| 152 | close(ker->kpagecount_fd); |
| 153 | close(ker->kpageflags_fd); |
| 154 | |
| 155 | free(ker); |
| 156 | |
| 157 | return 0; |
| 158 | } |