qemu-progress.c

   1 /*
   2  * QEMU progress printing utility functions
   3  *
   4  * Copyright (C) 2011 Jes Sorensen <Jes.Sorensen@redhat.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu-common.h"
  26 #include "osdep.h"
  27 #include "sysemu.h"
  28 #include <stdio.h>
  29 #include <signal.h>
  30
  31 struct progress_state {
  32     int enabled;
  33     float current;
  34     float last_print;
  35     float min_skip;
  36     void (*print)(void);
  37     void (*end)(void);
  38 };
  39
  40 static struct progress_state state;
  41
  42 /*
  43  * Simple progress print function.
  44  * @percent relative percent of current operation
  45  * @max percent of total operation
  46  */
  47 static void progress_simple_print(void)
  48 {
  49     if (state.enabled) {
  50         printf("    (%3.2f/100%%)\r", state.current);
  51         fflush(stdout);
  52     }
  53 }
  54
  55 static void progress_simple_end(void)
  56 {
  57     printf("\n");
  58 }
  59
  60 static void progress_simple_init(void)
  61 {
  62     state.print = progress_simple_print;
  63     state.end = progress_simple_end;
  64 }
  65
  66 #ifdef CONFIG_POSIX
  67 static void sigusr_print(int signal)
  68 {
  69     printf("    (%3.2f/100%%)\n", state.current);
  70 }
  71 #endif
  72
  73 static void progress_dummy_print(void)
  74 {
  75 }
  76
  77 static void progress_dummy_end(void)
  78 {
  79 }
  80
  81 static void progress_dummy_init(void)
  82 {
  83 #ifdef CONFIG_POSIX
  84     struct sigaction action;
  85
  86     memset(&action, 0, sizeof(action));
  87     sigfillset(&action.sa_mask);
  88     action.sa_handler = sigusr_print;
  89     action.sa_flags = 0;
  90     sigaction(SIGUSR1, &action, NULL);
  91 #endif
  92
  93     state.print = progress_dummy_print;
  94     state.end = progress_dummy_end;
  95 }
  96
  97 void qemu_progress_init(int enabled, float min_skip)
  98 {
  99     state.enabled = enabled;
 100     state.min_skip = min_skip;
 101     if (enabled) {
 102         progress_simple_init();
 103     } else {
 104         progress_dummy_init();
 105     }
 106 }
 107
 108 void qemu_progress_end(void)
 109 {
 110     state.end();
 111 }
 112
 113 void qemu_progress_print(float percent, int max)
 114 {
 115     float current;
 116
 117     if (max == 0) {
 118         current = percent;
 119     } else {
 120         current = state.current + percent / 100 * max;
 121     }
 122     if (current > 100) {
 123         current = 100;
 124     }
 125     state.current = current;
 126
 127     if (current > (state.last_print + state.min_skip) ||
 128         (current == 100) || (current == 0)) {
 129         state.last_print = state.current;
 130         state.print();
 131     }
 132 }