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- /*
- * Copyright (C) 2008 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 <stdlib.h>
- #include <stdio.h>
- #include <unistd.h>
- #include <string.h>
- #include <fcntl.h>
- #include <sys/mount.h>
- #include <errno.h>
- #include "sysdeps.h"
- #define TRACE_TAG TRACE_ADB
- #include "adb.h"
- static int system_ro = 1;
- /* Returns the device used to mount a directory in /proc/mounts */
- static char *find_mount(const char *dir)
- {
- int fd;
- int res;
- int size;
- char *token = NULL;
- const char delims[] = "\n";
- char buf[4096];
- fd = unix_open("/proc/mounts", O_RDONLY);
- if (fd < 0)
- return NULL;
- buf[sizeof(buf) - 1] = '\0';
- size = adb_read(fd, buf, sizeof(buf) - 1);
- adb_close(fd);
- token = strtok(buf, delims);
- while (token) {
- char mount_dev[256];
- char mount_dir[256];
- int mount_freq;
- int mount_passno;
- res = sscanf(token, "%255s %255s %*s %*s %d %d\n",
- mount_dev, mount_dir, &mount_freq, &mount_passno);
- mount_dev[255] = 0;
- mount_dir[255] = 0;
- if (res == 4 && (strcmp(dir, mount_dir) == 0))
- return strdup(mount_dev);
- token = strtok(NULL, delims);
- }
- return NULL;
- }
- /* Init mounts /system as read only, remount to enable writes. */
- static int remount_system()
- {
- char *dev;
- if (system_ro == 0) {
- return 0;
- }
- dev = find_mount("/system");
- if (!dev)
- return -1;
- system_ro = mount(dev, "/system", "none", MS_REMOUNT, NULL);
- free(dev);
- return system_ro;
- }
- static void write_string(int fd, const char* str)
- {
- writex(fd, str, strlen(str));
- }
- void remount_service(int fd, void *cookie)
- {
- int ret = remount_system();
- if (!ret)
- write_string(fd, "remount succeeded\n");
- else {
- char buffer[200];
- snprintf(buffer, sizeof(buffer), "remount failed: %s\n", strerror(errno));
- write_string(fd, buffer);
- }
- adb_close(fd);
- }
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