159 lines
3.5 KiB
C
159 lines
3.5 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <pagemap/pagemap.h>
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int pm_kernel_create(pm_kernel_t **ker_out) {
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pm_kernel_t *ker;
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int error;
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if (!ker_out)
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return 1;
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ker = calloc(1, sizeof(*ker));
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if (!ker)
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return errno;
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ker->kpagecount_fd = open("/proc/kpagecount", O_RDONLY);
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if (ker->kpagecount_fd < 0) {
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error = errno;
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free(ker);
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return error;
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}
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ker->kpageflags_fd = open("/proc/kpageflags", O_RDONLY);
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if (ker->kpageflags_fd < 0) {
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error = errno;
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close(ker->kpagecount_fd);
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free(ker);
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return error;
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}
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ker->pagesize = getpagesize();
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*ker_out = ker;
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return 0;
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}
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#define INIT_PIDS 20
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int pm_kernel_pids(pm_kernel_t *ker, pid_t **pids_out, size_t *len) {
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DIR *proc;
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struct dirent *dir;
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pid_t pid, *pids, *new_pids;
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size_t pids_count, pids_size;
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int error;
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proc = opendir("/proc");
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if (!proc)
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return errno;
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pids = malloc(INIT_PIDS * sizeof(pid_t));
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if (!pids) {
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closedir(proc);
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return errno;
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}
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pids_count = 0; pids_size = INIT_PIDS;
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while ((dir = readdir(proc))) {
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if (sscanf(dir->d_name, "%d", &pid) < 1)
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continue;
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if (pids_count >= pids_size) {
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new_pids = realloc(pids, 2 * pids_size * sizeof(pid_t));
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if (!new_pids) {
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error = errno;
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free(pids);
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closedir(proc);
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return error;
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}
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pids = new_pids;
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pids_size = 2 * pids_size;
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}
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pids[pids_count] = pid;
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pids_count++;
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}
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closedir(proc);
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new_pids = realloc(pids, pids_count * sizeof(pid_t));
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if (!new_pids) {
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error = errno;
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free(pids);
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return error;
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}
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*pids_out = new_pids;
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*len = pids_count;
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return 0;
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}
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int pm_kernel_count(pm_kernel_t *ker, uint64_t pfn, uint64_t *count_out) {
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off64_t off;
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if (!ker || !count_out)
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return -1;
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off = lseek64(ker->kpagecount_fd, pfn * sizeof(uint64_t), SEEK_SET);
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if (off == (off_t)-1)
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return errno;
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if (read(ker->kpagecount_fd, count_out, sizeof(uint64_t)) <
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(ssize_t)sizeof(uint64_t))
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return errno;
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return 0;
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}
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int pm_kernel_flags(pm_kernel_t *ker, uint64_t pfn, uint64_t *flags_out) {
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off64_t off;
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if (!ker || !flags_out)
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return -1;
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off = lseek64(ker->kpageflags_fd, pfn * sizeof(uint64_t), SEEK_SET);
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if (off == (off_t)-1)
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return errno;
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if (read(ker->kpageflags_fd, flags_out, sizeof(uint64_t)) <
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(ssize_t)sizeof(uint64_t))
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return errno;
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return 0;
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}
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int pm_kernel_destroy(pm_kernel_t *ker) {
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if (!ker)
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return -1;
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close(ker->kpagecount_fd);
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close(ker->kpageflags_fd);
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free(ker);
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return 0;
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}
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