Commit a1bca57f authored by Lei Li's avatar Lei Li Committed by Michael Roth
Browse files

qga: add guest-set-time command 



Signed-off-by: default avatarLei Li <lilei@linux.vnet.ibm.com>
Reviewed-by: default avatarEric Blake <eblake@redhat.com>
Reviewed-by: default avatarMichael Roth <mdroth@linux.vnet.ibm.com>

*added stub for w32

Signed-off-by: default avatarMichael Roth <mdroth@linux.vnet.ibm.com>
parent 6912e6a9

qga/commands-posix.c

+55 −0
Original line number Diff line number Diff line
@@ -135,6 +135,61 @@ int64_t qmp_guest_get_time(Error **errp) 
   return time_ns;

}



void qmp_guest_set_time(int64_t time_ns, Error **errp)

{

    int ret;

    int status;

    pid_t pid;

    Error *local_err = NULL;

    struct timeval tv;



    /* year-2038 will overflow in case time_t is 32bit */

    if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) {

        error_setg(errp, "Time %" PRId64 " is too large", time_ns);

        return;

    }



    tv.tv_sec = time_ns / 1000000000;

    tv.tv_usec = (time_ns % 1000000000) / 1000;



    ret = settimeofday(&tv, NULL);

    if (ret < 0) {

        error_setg_errno(errp, errno, "Failed to set time to guest");

        return;

    }



    /* Set the Hardware Clock to the current System Time. */

    pid = fork();

    if (pid == 0) {

        setsid();

        reopen_fd_to_null(0);

        reopen_fd_to_null(1);

        reopen_fd_to_null(2);



        execle("/sbin/hwclock", "hwclock", "-w", NULL, environ);

        _exit(EXIT_FAILURE);

    } else if (pid < 0) {

        error_setg_errno(errp, errno, "failed to create child process");

        return;

    }



    ga_wait_child(pid, &status, &local_err);

    if (error_is_set(&local_err)) {

        error_propagate(errp, local_err);

        return;

    }



    if (!WIFEXITED(status)) {

        error_setg(errp, "child process has terminated abnormally");

        return;

    }



    if (WEXITSTATUS(status)) {

        error_setg(errp, "hwclock failed to set hardware clock to system time");

        return;

    }

}



typedef struct GuestFileHandle {

    uint64_t id;

    FILE *fh;

qga/commands-win32.c

+5 −0
Original line number Diff line number Diff line
@@ -284,6 +284,11 @@ int64_t qmp_guest_get_time(Error **errp) 
    return -1;

}



void qmp_guest_set_time(int64_t time_ns, Error **errp)

{

    error_set(errp, QERR_UNSUPPORTED);

}



/* register init/cleanup routines for stateful command groups */

void ga_command_state_init(GAState *s, GACommandState *cs)

{

qga/qapi-schema.json

+26 −0
Original line number Diff line number Diff line
@@ -95,6 +95,32 @@ 
{ 'command': 'guest-get-time',

  'returns': 'int' }



##

# @guest-set-time:

#

# Set guest time.

#

# When a guest is paused or migrated to a file then loaded

# from that file, the guest OS has no idea that there

# was a big gap in the time. Depending on how long the

# gap was, NTP might not be able to resynchronize the

# guest.

#

# This command tries to set guest time to the given value,

# then sets the Hardware Clock to the current System Time.

# This will make it easier for a guest to resynchronize

# without waiting for NTP.

#

# @time: time of nanoseconds, relative to the Epoch of

#        1970-01-01 in UTC.

#

# Returns: Nothing on success.

#

# Since: 1.5

##

{ 'command': 'guest-set-time',

  'data': { 'time': 'int' } }



##

# @GuestAgentCommandInfo:

#