progress.c

   1 /*      $NetBSD: progress.c,v 1.18 2010/07/17 10:51:03 tron Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by John Hawkinson.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __RCSID("$NetBSD: progress.c,v 1.18 2010/07/17 10:51:03 tron Exp $");
  35 #endif                          /* not lint */
  36
  37 #include <sys/types.h>
  38 #include <sys/param.h>
  39 #include <sys/socket.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/time.h>
  42 #include <sys/wait.h>
  43 #include <netinet/in.h>
  44 #include <arpa/ftp.h>
  45
  46 #include <err.h>
  47 #include <errno.h>
  48 #include <fcntl.h>
  49 #include <glob.h>
  50 #include <signal.h>
  51 #include <inttypes.h>
  52 #include <limits.h>
  53 #include <netdb.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <termios.h>
  58 #include <time.h>
  59 #include <tzfile.h>
  60 #include <unistd.h>
  61
  62 #define GLOBAL                  /* force GLOBAL decls in progressbar.h to be
  63                                  * declared */
  64 #include "progressbar.h"
  65
  66 static void broken_pipe(int unused);
  67 static void usage(void);
  68 int main(int, char *[]);
  69
  70 static void
  71 broken_pipe(int unused)
  72 {
  73         signal(SIGPIPE, SIG_DFL);
  74         progressmeter(1);
  75         kill(getpid(), SIGPIPE);
  76 }
  77
  78 static void
  79 usage(void)
  80 {
  81         fprintf(stderr,
  82             "usage: %s [-ez] [-b buffersize] [-f file] [-l length]\n"
  83             "       %*.s [-p prefix] cmd [args...]\n",
  84             getprogname(), (int) strlen(getprogname()), "");
  85         exit(EXIT_FAILURE);
  86 }
  87
  88
  89 int
  90 main(int argc, char *argv[])
  91 {
  92         char *fb_buf;
  93         char *infile = NULL;
  94         pid_t pid = 0, gzippid = 0, deadpid;
  95         int ch, fd, outpipe[2];
  96         int ws, gzipstat, cmdstat;
  97         int eflag = 0, lflag = 0, zflag = 0;
  98         ssize_t nr, nw, off;
  99         size_t buffersize;
 100         struct stat statb;
 101         struct ttysize ts;
 102
 103         setprogname(argv[0]);
 104
 105         /* defaults: Read from stdin, 0 filesize (no completion estimate) */
 106         fd = STDIN_FILENO;
 107         filesize = 0;
 108         buffersize = 64 * 1024;
 109         prefix = NULL;
 110
 111         while ((ch = getopt(argc, argv, "b:ef:l:p:z")) != -1)
 112                 switch (ch) {
 113                 case 'b':
 114                         buffersize = (size_t) strsuftoll("buffer size", optarg,
 115                             0, SSIZE_MAX);
 116                         break;
 117                 case 'e':
 118                         eflag++;
 119                         break;
 120                 case 'f':
 121                         infile = optarg;
 122                         break;
 123                 case 'l':
 124                         lflag++;
 125                         filesize = strsuftoll("input size", optarg, 0,
 126                             LLONG_MAX);
 127                         break;
 128                 case 'p':
 129                         prefix = optarg;
 130                         break;
 131                 case 'z':
 132                         zflag++;
 133                         break;
 134                 case '?':
 135                 default:
 136                         usage();
 137                         /* NOTREACHED */
 138                 }
 139         argc -= optind;
 140         argv += optind;
 141
 142         if (argc < 1)
 143                 usage();
 144
 145         if (infile && (fd = open(infile, O_RDONLY, 0)) < 0)
 146                 err(1, "%s", infile);
 147
 148         /* stat() to get the filesize unless overridden, or -z */
 149         if (!zflag && !lflag && (fstat(fd, &statb) == 0)) {
 150                 if (S_ISFIFO(statb.st_mode)) {
 151                         /* stat(2) on pipe may return only the
 152                          * first few bytes with more coming.
 153                          * Don't trust!
 154                          */
 155                 } else {
 156                         filesize = statb.st_size;
 157                 }
 158         }
 159
 160         /* gzip -l the file if we have the name and -z is given */
 161         if (zflag && !lflag && infile != NULL) {
 162                 FILE *gzipsizepipe;
 163                 char buf[256], *cp, *cmd;
 164
 165                 /*
 166                  * Read second word of last line of gzip -l output. Looks like:
 167                  * % gzip -l ../etc.tgz
 168                  *   compressed uncompressed  ratio uncompressed_name
 169                  *       119737       696320  82.8% ../etc.tar
 170                  */
 171
 172                 asprintf(&cmd, "gzip -l %s", infile);
 173                 if ((gzipsizepipe = popen(cmd, "r")) == NULL)
 174                         err(1, "reading compressed file length");
 175                 for (; fgets(buf, 256, gzipsizepipe) != NULL;)
 176                     continue;
 177                 strtoimax(buf, &cp, 10);
 178                 filesize = strtoimax(cp, NULL, 10);
 179                 if (pclose(gzipsizepipe) < 0)
 180                         err(1, "closing compressed file length pipe");
 181                 free(cmd);
 182         }
 183         /* Pipe input through gzip -dc if -z is given */
 184         if (zflag) {
 185                 int gzippipe[2];
 186
 187                 if (pipe(gzippipe) < 0)
 188                         err(1, "gzip pipe");
 189                 gzippid = fork();
 190                 if (gzippid < 0)
 191                         err(1, "fork for gzip");
 192
 193                 if (gzippid) {
 194                         /* parent */
 195                         dup2(gzippipe[0], fd);
 196                         close(gzippipe[0]);
 197                         close(gzippipe[1]);
 198                 } else {
 199                         dup2(gzippipe[1], STDOUT_FILENO);
 200                         dup2(fd, STDIN_FILENO);
 201                         close(gzippipe[0]);
 202                         close(gzippipe[1]);
 203                         if (execlp("gzip", "gzip", "-dc", NULL))
 204                                 err(1, "exec()ing gzip");
 205                 }
 206         }
 207
 208         /* Initialize progressbar.c's global state */
 209         bytes = 0;
 210         progress = 1;
 211         ttyout = eflag ? stderr : stdout;
 212
 213         if (ioctl(fileno(ttyout), TIOCGSIZE, &ts) == -1)
 214                 ttywidth = 80;
 215         else
 216                 ttywidth = ts.ts_cols;
 217
 218         fb_buf = malloc(buffersize);
 219         if (fb_buf == NULL)
 220                 err(1, "malloc for buffersize");
 221
 222         if (pipe(outpipe) < 0)
 223                 err(1, "output pipe");
 224         pid = fork();
 225         if (pid < 0)
 226                 err(1, "fork for output pipe");
 227
 228         if (pid == 0) {
 229                 /* child */
 230                 dup2(outpipe[0], STDIN_FILENO);
 231                 close(outpipe[0]);
 232                 close(outpipe[1]);
 233                 execvp(argv[0], argv);
 234                 err(1, "could not exec %s", argv[0]);
 235         }
 236         close(outpipe[0]);
 237
 238         signal(SIGPIPE, broken_pipe);
 239         progressmeter(-1);
 240
 241         while ((nr = read(fd, fb_buf, buffersize)) > 0)
 242                 for (off = 0; nr; nr -= nw, off += nw, bytes += nw)
 243                         if ((nw = write(outpipe[1], fb_buf + off,
 244                             (size_t) nr)) < 0) {
 245                                 progressmeter(1);
 246                                 err(1, "writing %u bytes to output pipe",
 247                                                         (unsigned) nr);
 248                         }
 249         close(outpipe[1]);
 250
 251         gzipstat = 0;
 252         cmdstat = 0;
 253         while (pid || gzippid) {
 254                 deadpid = wait(&ws);
 255                 /*
 256                  * We need to exit with an error if the command (or gzip)
 257                  * exited abnormally.
 258                  * Unfortunately we can't generate a true 'exited by signal'
 259                  * error without sending the signal to ourselves :-(
 260                  */
 261                 ws = WIFSIGNALED(ws) ? WTERMSIG(ws) : WEXITSTATUS(ws);
 262
 263                 if (deadpid != -1 && errno == EINTR)
 264                         continue;
 265                 if (deadpid == pid) {
 266                         pid = 0;
 267                         cmdstat = ws;
 268                         continue;
 269                 }
 270                 if (deadpid == gzippid) {
 271                         gzippid = 0;
 272                         gzipstat = ws;
 273                         continue;
 274                 }
 275                 break;
 276         }
 277
 278         progressmeter(1);
 279         signal(SIGPIPE, SIG_DFL);
 280
 281         free(fb_buf);
 282
 283         exit(cmdstat ? cmdstat : gzipstat);
 284 }