Archipelago » qemu

/*

 * QEMU progress printing utility functions

 *

 * Copyright (C) 2011 Jes Sorensen <Jes.Sorensen@redhat.com>

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "qemu-common.h"

#include "osdep.h"

#include "sysemu.h"

#include <stdio.h>

#include <signal.h>

struct progress_state {

    float current;

    float last_print;

    float min_skip;

    void (*print)(void);

    void (*end)(void);

};

static struct progress_state state;

static volatile sig_atomic_t print_pending;

/*

 * Simple progress print function.

 * @percent relative percent of current operation

 * @max percent of total operation

 */

static void progress_simple_print(void)

{

    printf("    (%3.2f/100%%)\r", state.current);

    fflush(stdout);

}

static void progress_simple_end(void)

{

    printf("\n");

}

static void progress_simple_init(void)

{

    state.print = progress_simple_print;

    state.end = progress_simple_end;

}

#ifdef CONFIG_POSIX

static void sigusr_print(int signal)

{

    print_pending = 1;

}

#endif

static void progress_dummy_print(void)

{

    if (print_pending) {

        fprintf(stderr, "    (%3.2f/100%%)\n", state.current);

        print_pending = 0;

    }

}

static void progress_dummy_end(void)

{

}

static void progress_dummy_init(void)

{

#ifdef CONFIG_POSIX

    struct sigaction action;

    memset(&action, 0, sizeof(action));

    sigfillset(&action.sa_mask);

    action.sa_handler = sigusr_print;

    action.sa_flags = 0;

    sigaction(SIGUSR1, &action, NULL);

#endif

    state.print = progress_dummy_print;

    state.end = progress_dummy_end;

}

/*

 * Initialize progress reporting.

 * If @enabled is false, actual reporting is suppressed.  The user can

 * still trigger a report by sending a SIGUSR1.

 * Reports are also suppressed unless we've had at least @min_skip

 * percent progress since the last report.

 */

void qemu_progress_init(int enabled, float min_skip)

{

    state.min_skip = min_skip;

    if (enabled) {

        progress_simple_init();

    } else {

        progress_dummy_init();

    }

}

void qemu_progress_end(void)

{

    state.end();

}

/*

 * Report progress.

 * @delta is how much progress we made.

 * If @max is zero, @delta is an absolut value of the total job done.

 * Else, @delta is a progress delta since the last call, as a fraction

 * of @max.  I.e. the delta is @delta * @max / 100. This allows

 * relative accounting of functions which may be a different fraction of

 * the full job, depending on the context they are called in. I.e.

 * a function might be considered 40% of the full job if used from

 * bdrv_img_create() but only 20% if called from img_convert().

 */

void qemu_progress_print(float delta, int max)

{

    float current;

    if (max == 0) {

        current = delta;

    } else {

        current = state.current + delta / 100 * max;

    }

    if (current > 100) {

        current = 100;

    }

    state.current = current;

    if (current > (state.last_print + state.min_skip) ||

        (current == 100) || (current == 0)) {

        state.last_print = state.current;

        state.print();

    }

}