crypto/openssh/progressmeter.c

   1 /* $OpenBSD: progressmeter.c,v 1.37 2006/08/03 03:34:42 deraadt Exp $ */
   2 /*
   3  * Copyright (c) 2003 Nils Nordman.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "includes.h"
  27
  28 #include <sys/types.h>
  29 #include <sys/ioctl.h>
  30 #include <sys/uio.h>
  31
  32 #include <errno.h>
  33 #include <signal.h>
  34 #include <stdio.h>
  35 #include <string.h>
  36 #include <time.h>
  37 #include <unistd.h>
  38
  39 #include "progressmeter.h"
  40 #include "atomicio.h"
  41 #include "misc.h"
  42
  43 #define DEFAULT_WINSIZE 80
  44 #define MAX_WINSIZE 512
  45 #define PADDING 1               /* padding between the progress indicators */
  46 #define UPDATE_INTERVAL 1       /* update the progress meter every second */
  47 #define STALL_TIME 5            /* we're stalled after this many seconds */
  48
  49 /* determines whether we can output to the terminal */
  50 static int can_output(void);
  51
  52 /* formats and inserts the specified size into the given buffer */
  53 static void format_size(char *, int, off_t);
  54 static void format_rate(char *, int, off_t);
  55
  56 /* window resizing */
  57 static void sig_winch(int);
  58 static void setscreensize(void);
  59
  60 /* updates the progressmeter to reflect the current state of the transfer */
  61 void refresh_progress_meter(void);
  62
  63 /* signal handler for updating the progress meter */
  64 static void update_progress_meter(int);
  65
  66 static time_t start;            /* start progress */
  67 static time_t last_update;      /* last progress update */
  68 static char *file;              /* name of the file being transferred */
  69 static off_t end_pos;           /* ending position of transfer */
  70 static off_t cur_pos;           /* transfer position as of last refresh */
  71 static off_t last_pos;
  72 static off_t max_delta_pos = 0;
  73 static volatile off_t *counter; /* progress counter */
  74 static long stalled;            /* how long we have been stalled */
  75 static int bytes_per_second;    /* current speed in bytes per second */
  76 static int win_size;            /* terminal window size */
  77 static volatile sig_atomic_t win_resized; /* for window resizing */
  78
  79 /* units for format_size */
  80 static const char unit[] = " KMGT";
  81
  82 static int
  83 can_output(void)
  84 {
  85         return (getpgrp() == tcgetpgrp(STDOUT_FILENO));
  86 }
  87
  88 static void
  89 format_rate(char *buf, int size, off_t bytes)
  90 {
  91         int i;
  92
  93         bytes *= 100;
  94         for (i = 0; bytes >= 100*1000 && unit[i] != 'T'; i++)
  95                 bytes = (bytes + 512) / 1024;
  96         if (i == 0) {
  97                 i++;
  98                 bytes = (bytes + 512) / 1024;
  99         }
 100         snprintf(buf, size, "%3lld.%1lld%c%s",
 101             (long long) (bytes + 5) / 100,
 102             (long long) (bytes + 5) / 10 % 10,
 103             unit[i],
 104             i ? "B" : " ");
 105 }
 106
 107 static void
 108 format_size(char *buf, int size, off_t bytes)
 109 {
 110         int i;
 111
 112         for (i = 0; bytes >= 10000 && unit[i] != 'T'; i++)
 113                 bytes = (bytes + 512) / 1024;
 114         snprintf(buf, size, "%4lld%c%s",
 115             (long long) bytes,
 116             unit[i],
 117             i ? "B" : " ");
 118 }
 119
 120 void
 121 refresh_progress_meter(void)
 122 {
 123         char buf[MAX_WINSIZE + 1];
 124         time_t now;
 125         off_t transferred;
 126         double elapsed;
 127         int percent;
 128         off_t bytes_left;
 129         int cur_speed;
 130         int hours, minutes, seconds;
 131         int i, len;
 132         int file_len;
 133         off_t delta_pos;
 134
 135         transferred = *counter - cur_pos;
 136         cur_pos = *counter;
 137         now = time(NULL);
 138         bytes_left = end_pos - cur_pos;
 139
 140         delta_pos = cur_pos - last_pos;
 141         if (delta_pos > max_delta_pos)
 142                 max_delta_pos = delta_pos;
 143
 144         if (bytes_left > 0)
 145                 elapsed = now - last_update;
 146         else {
 147                 elapsed = now - start;
 148                 /* Calculate true total speed when done */
 149                 transferred = end_pos;
 150                 bytes_per_second = 0;
 151         }
 152
 153         /* calculate speed */
 154         if (elapsed != 0)
 155                 cur_speed = (transferred / elapsed);
 156         else
 157                 cur_speed = transferred;
 158
 159 #define AGE_FACTOR 0.9
 160         if (bytes_per_second != 0) {
 161                 bytes_per_second = (bytes_per_second * AGE_FACTOR) +
 162                     (cur_speed * (1.0 - AGE_FACTOR));
 163         } else
 164                 bytes_per_second = cur_speed;
 165
 166         /* filename */
 167         buf[0] = '\0';
 168         file_len = win_size - 45;
 169         if (file_len > 0) {
 170                 len = snprintf(buf, file_len + 1, "\r%s", file);
 171                 if (len < 0)
 172                         len = 0;
 173                 if (len >= file_len + 1)
 174                         len = file_len;
 175                 for (i = len; i < file_len; i++)
 176                         buf[i] = ' ';
 177                 buf[file_len] = '\0';
 178         }
 179
 180         /* percent of transfer done */
 181         if (end_pos != 0)
 182                 percent = ((float)cur_pos / end_pos) * 100;
 183         else
 184                 percent = 100;
 185
 186         snprintf(buf + strlen(buf), win_size - strlen(buf-8),
 187             " %3d%% ", percent);
 188
 189         /* amount transferred */
 190         format_size(buf + strlen(buf), win_size - strlen(buf),
 191             cur_pos);
 192         strlcat(buf, " ", win_size);
 193
 194         /* bandwidth usage */
 195         format_rate(buf + strlen(buf), win_size - strlen(buf),
 196             (off_t)bytes_per_second);
 197         strlcat(buf, "/s ", win_size);
 198
 199         /* instantaneous rate */
 200         if (bytes_left > 0)
 201                 format_rate(buf + strlen(buf), win_size - strlen(buf),
 202                             delta_pos);
 203         else
 204                 format_rate(buf + strlen(buf), win_size - strlen(buf),
 205                             max_delta_pos);
 206         strlcat(buf, "/s ", win_size);
 207
 208         /* ETA */
 209         if (!transferred)
 210                 stalled += elapsed;
 211         else
 212                 stalled = 0;
 213
 214         if (stalled >= STALL_TIME)
 215                 strlcat(buf, "- stalled -", win_size);
 216         else if (bytes_per_second == 0 && bytes_left)
 217                 strlcat(buf, "  --:-- ETA", win_size);
 218         else {
 219                 if (bytes_left > 0)
 220                         seconds = bytes_left / bytes_per_second;
 221                 else
 222                         seconds = elapsed;
 223
 224                 hours = seconds / 3600;
 225                 seconds -= hours * 3600;
 226                 minutes = seconds / 60;
 227                 seconds -= minutes * 60;
 228
 229                 if (hours != 0)
 230                         snprintf(buf + strlen(buf), win_size - strlen(buf),
 231                             "%d:%02d:%02d", hours, minutes, seconds);
 232                 else
 233                         snprintf(buf + strlen(buf), win_size - strlen(buf),
 234                             "  %02d:%02d", minutes, seconds);
 235
 236                 if (bytes_left > 0)
 237                         strlcat(buf, " ETA", win_size);
 238                 else
 239                         strlcat(buf, "    ", win_size);
 240         }
 241
 242         atomicio(vwrite, STDOUT_FILENO, buf, win_size - 1);
 243         last_update = now;
 244         last_pos = cur_pos;
 245 }
 246
 247 /*ARGSUSED*/
 248 static void
 249 update_progress_meter(int ignore)
 250 {
 251         int save_errno;
 252
 253         save_errno = errno;
 254
 255         if (win_resized) {
 256                 setscreensize();
 257                 win_resized = 0;
 258         }
 259         if (can_output())
 260                 refresh_progress_meter();
 261
 262         signal(SIGALRM, update_progress_meter);
 263         alarm(UPDATE_INTERVAL);
 264         errno = save_errno;
 265 }
 266
 267 void
 268 start_progress_meter(char *f, off_t filesize, off_t *ctr)
 269 {
 270         start = last_update = time(NULL);
 271         file = f;
 272         end_pos = filesize;
 273         cur_pos = 0;
 274         counter = ctr;
 275         stalled = 0;
 276         bytes_per_second = 0;
 277
 278         setscreensize();
 279         if (can_output())
 280                 refresh_progress_meter();
 281
 282         signal(SIGALRM, update_progress_meter);
 283         signal(SIGWINCH, sig_winch);
 284         alarm(UPDATE_INTERVAL);
 285 }
 286
 287 void
 288 stop_progress_meter(void)
 289 {
 290         alarm(0);
 291
 292         if (!can_output())
 293                 return;
 294
 295         /* Ensure we complete the progress */
 296         if (cur_pos != end_pos)
 297                 refresh_progress_meter();
 298
 299         atomicio(vwrite, STDOUT_FILENO, "\n", 1);
 300 }
 301
 302 /*ARGSUSED*/
 303 static void
 304 sig_winch(int sig)
 305 {
 306         win_resized = 1;
 307 }
 308
 309 static void
 310 setscreensize(void)
 311 {
 312         struct winsize winsize;
 313
 314         if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &winsize) != -1 &&
 315             winsize.ws_col != 0) {
 316                 if (winsize.ws_col > MAX_WINSIZE)
 317                         win_size = MAX_WINSIZE;
 318                 else
 319                         win_size = winsize.ws_col;
 320         } else
 321                 win_size = DEFAULT_WINSIZE;
 322         win_size += 1;                                  /* trailing \0 */
 323 }