1 files changed, 150 insertions, 0 deletions
diff --git a/util/qemu-progress.c b/util/qemu-progress.c
new file mode 100644
index 0000000000..9a3f96cd47
--- /dev/null
+++ b/util/qemu-progress.c
@@ -0,0 +1,150 @@
+/*
+ * 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 "qemu/osdep.h"
+#include "sysemu/sysemu.h"
+#include <stdio.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();
+    }
+}