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Commit eac33da6 authored by Todd Poynor's avatar Todd Poynor Committed by Keun-young Park
Browse files

libcutils: android_reboot: save reboot reason in file 

Save a string identifying the reason for last Android reboot or power
off in file /data/misc/recovery/last_reboot_reason .  This file may
be used for informing users of reboot or shutdown reasons at next
boot, and for other diagnostic purposes.

Bug: 30994946
Test: Manual: reboot, setprop sys.powerctl
Change-Id: I01e44473fdd21b33e9e4dced77aba9a66b6d3755
parent 16663a2a

libcutils/android_reboot.c

+45 −0
Original line number Diff line number Diff line
@@ -189,11 +189,56 @@ out: 
    free_entries(&ro_entries);

}



static void save_reboot_reason(int cmd, const char *arg)

{

    FILE *fp;

    const char *reason = NULL;



    fp = fopen(LAST_REBOOT_REASON_FILE, "w");

    if (fp == NULL) {

        KLOG_WARNING(TAG, "Error creating " LAST_REBOOT_REASON_FILE

                     ": %s\n", strerror(errno));

        return;

    }

    switch (cmd) {

        case ANDROID_RB_RESTART:

            reason = "restart";

            break;



        case ANDROID_RB_POWEROFF:

            reason = "power-off";

            break;



        case ANDROID_RB_RESTART2:

            reason = arg && strlen(arg) ? arg : "restart";

            break;



        case ANDROID_RB_THERMOFF:

            reason = "thermal-shutdown";

            break;



        default:

            fprintf(fp,"0x%08X\n", cmd);

            break;

    }



    if (reason) {

        if (fprintf(fp, "%s\n", reason) < 0) {

             KLOG_WARNING(TAG, "Error writing " LAST_REBOOT_REASON_FILE

                          ": %s\n", strerror(errno));

        }

    }



    fclose(fp);

}



int android_reboot_with_callback(

    int cmd, int flags __unused, const char *arg,

    void (*cb_on_remount)(const struct mntent*))

{

    int ret;



    save_reboot_reason(cmd, arg);

    remount_ro(cb_on_remount);

    switch (cmd) {

        case ANDROID_RB_RESTART:

libcutils/include/cutils/android_reboot.h

+3 −0
Original line number Diff line number Diff line
@@ -30,6 +30,9 @@ __BEGIN_DECLS 
/* Properties */

#define ANDROID_RB_PROPERTY "sys.powerctl"



/* Android reboot reason stored in this file */

#define LAST_REBOOT_REASON_FILE "/data/misc/recovery/last_reboot_reason"



int android_reboot(int cmd, int flags, const char *arg);

int android_reboot_with_callback(

    int cmd, int flags, const char *arg,