Use getmntent when accessing /proc/mounts.
Bug: 18887435
Change-Id: Ice44c14fc8ee79eab259caf486e123b6af21ceb0
diff --git a/mtdutils/mounts.c b/mtdutils/mounts.c
index c90fc8a..6a9b03d 100644
--- a/mtdutils/mounts.c
+++ b/mtdutils/mounts.c
@@ -14,6 +14,7 @@
* limitations under the License.
*/
+#include <mntent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -59,10 +60,8 @@
int
scan_mounted_volumes()
{
- char buf[2048];
- const char *bufp;
- int fd;
- ssize_t nbytes;
+ FILE* fp;
+ struct mntent* mentry;
if (g_mounts_state.volumes == NULL) {
const int numv = 32;
@@ -84,80 +83,20 @@
}
g_mounts_state.volume_count = 0;
- /* Open and read the file contents.
- */
- fd = open(PROC_MOUNTS_FILENAME, O_RDONLY);
- if (fd < 0) {
- goto bail;
+ /* Open and read mount table entries. */
+ fp = setmntent(PROC_MOUNTS_FILENAME, "r");
+ if (fp == NULL) {
+ return -1;
}
- nbytes = read(fd, buf, sizeof(buf) - 1);
- close(fd);
- if (nbytes < 0) {
- goto bail;
+ while ((mentry = getmntent(fp)) != NULL) {
+ MountedVolume* v = &g_mounts_state.volumes[g_mounts_state.volume_count++];
+ v->device = strdup(mentry->mnt_fsname);
+ v->mount_point = strdup(mentry->mnt_dir);
+ v->filesystem = strdup(mentry->mnt_type);
+ v->flags = strdup(mentry->mnt_opts);
}
- buf[nbytes] = '\0';
-
- /* Parse the contents of the file, which looks like:
- *
- * # cat /proc/mounts
- * rootfs / rootfs rw 0 0
- * /dev/pts /dev/pts devpts rw 0 0
- * /proc /proc proc rw 0 0
- * /sys /sys sysfs rw 0 0
- * /dev/block/mtdblock4 /system yaffs2 rw,nodev,noatime,nodiratime 0 0
- * /dev/block/mtdblock5 /data yaffs2 rw,nodev,noatime,nodiratime 0 0
- * /dev/block/mmcblk0p1 /sdcard vfat rw,sync,dirsync,fmask=0000,dmask=0000,codepage=cp437,iocharset=iso8859-1,utf8 0 0
- *
- * The zeroes at the end are dummy placeholder fields to make the
- * output match Linux's /etc/mtab, but don't represent anything here.
- */
- bufp = buf;
- while (nbytes > 0) {
- char device[64];
- char mount_point[64];
- char filesystem[64];
- char flags[128];
- int matches;
-
- /* %as is a gnu extension that malloc()s a string for each field.
- */
- matches = sscanf(bufp, "%63s %63s %63s %127s",
- device, mount_point, filesystem, flags);
-
- if (matches == 4) {
- device[sizeof(device)-1] = '\0';
- mount_point[sizeof(mount_point)-1] = '\0';
- filesystem[sizeof(filesystem)-1] = '\0';
- flags[sizeof(flags)-1] = '\0';
-
- MountedVolume *v =
- &g_mounts_state.volumes[g_mounts_state.volume_count++];
- v->device = strdup(device);
- v->mount_point = strdup(mount_point);
- v->filesystem = strdup(filesystem);
- v->flags = strdup(flags);
- } else {
-printf("matches was %d on <<%.40s>>\n", matches, bufp);
- }
-
- /* Eat the line.
- */
- while (nbytes > 0 && *bufp != '\n') {
- bufp++;
- nbytes--;
- }
- if (nbytes > 0) {
- bufp++;
- nbytes--;
- }
- }
-
+ endmntent(fp);
return 0;
-
-bail:
-//TODO: free the strings we've allocated.
- g_mounts_state.volume_count = 0;
- return -1;
}
const MountedVolume *
