]>
git.wh0rd.org - dump.git/blob - dump/main.c
2 * Ported to Linux's Second Extended File System as part of the
3 * dump and restore backup suit
4 * Remy Card <card@Linux.EU.Org>, 1994-1997
5 * Stelian Pop <pop@cybercable.fr>, 1999-2000
9 * Copyright (c) 1980, 1991, 1993, 1994
10 * The Regents of the University of California. All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 static const char rcsid
[] =
43 "$Id: main.c,v 1.15 2000/02/04 20:22:21 stelian Exp $";
46 #include <sys/param.h>
49 #include <linux/ext2_fs.h>
51 #include <bsdcompat.h>
54 #include <sys/vnode.h>
56 #include <ufs/inode.h>
59 #include <ufs/ufs/dinode.h>
60 #include <ufs/ffs/fs.h>
64 #include <protocols/dumprestore.h>
67 #include <compaterr.h>
77 #include <ext2fs/ext2fs.h>
81 #include "pathnames.h"
84 #define SBOFF (SBLOCK * DEV_BSIZE)
87 int notify
= 0; /* notify operator flag */
88 int blockswritten
= 0; /* number of blocks written on current tape */
89 int tapeno
= 0; /* current tape number */
90 int density
= 0; /* density in bytes/0.1" " <- this is for hilit19 */
91 int ntrec
= NTREC
; /* # tape blocks in each tape record */
92 int cartridge
= 0; /* Assume non-cartridge tape */
93 int dokerberos
= 0; /* Use Kerberos authentication */
94 long dev_bsize
= 1; /* recalculated below */
95 long blocksperfile
; /* output blocks per file */
96 char *host
= NULL
; /* remote host (if any) */
97 int sizest
= 0; /* return size estimate only */
103 int maxbsize
= 64*1024; /* XXX MAXBSIZE from sys/param.h */
104 static long numarg
__P((const char *, long, long));
105 static void obsolete
__P((int *, char **[]));
106 static void usage
__P((void));
108 ino_t iexclude_list
[IEXCLUDE_MAXNUM
]; /* the inode exclude list */
109 int iexclude_num
= 0; /* number of elements in the list */
112 main(int argc
, char *argv
[])
116 register struct dinode
*dp
;
117 register struct fstab
*dt
;
120 int i
, anydirskipped
, bflag
= 0, Tflag
= 0, honorlevel
= 1;
124 char directory
[NAME_MAX
];
125 char pathname
[NAME_MAX
];
128 char labelstr
[LBLSIZE
];
132 (void)time4(&spcl
.c_date
);
134 (void)time((time_t *)&spcl
.c_date
);
138 __progname
= argv
[0];
140 initialize_ext2_error_table();
143 tsize
= 0; /* Default later, based on 'c' option for cart tapes */
144 if ((tapeprefix
= getenv("TAPE")) == NULL
)
145 tapeprefix
= _PATH_DEFTAPE
;
146 dumpdates
= _PATH_DUMPDATES
;
148 strcpy(labelstr
, "none"); /* XXX safe strcpy. */
149 if (TP_BSIZE
/ DEV_BSIZE
== 0 || TP_BSIZE
% DEV_BSIZE
!= 0)
150 quit("TP_BSIZE must be a multiple of DEV_BSIZE\n");
156 obsolete(&argc
, &argv
);
158 #define optstring "0123456789aB:b:cd:e:f:h:kL:Mns:ST:uWw"
160 #define optstring "0123456789aB:b:cd:e:f:h:L:Mns:ST:uWw"
162 while ((ch
= getopt(argc
, argv
, optstring
)) != -1)
166 case '0': case '1': case '2': case '3': case '4':
167 case '5': case '6': case '7': case '8': case '9':
171 case 'a': /* `auto-size', Write to EOM. */
175 case 'B': /* blocks per output file */
176 blocksperfile
= numarg("number of blocks per file",
180 case 'b': /* blocks per tape write */
181 ntrec
= numarg("number of blocks per write",
183 if (ntrec
> maxbsize
/1024) {
184 msg("Please choose a blocksize <= %dKB\n",
191 case 'c': /* Tape is cart. not 9-track */
195 case 'd': /* density, in bits per inch */
196 density
= numarg("density", 10L, 327670L) / 10;
197 if (density
>= 625 && !bflag
)
198 ntrec
= HIGHDENSITYTREC
;
202 case 'e': /* exclude an inode */
203 iexclude_list
[iexclude_num
++] =
204 numarg("inode to exclude",0L,0L);
205 msg("Added %d to exclude list\n",
206 iexclude_list
[iexclude_num
-1]);
209 case 'f': /* output file */
214 honorlevel
= numarg("honor level", 0L, 10L);
225 * Note that although there are LBLSIZE characters,
226 * the last must be '\0', so the limit on strlen()
227 * is really LBLSIZE-1.
229 strncpy(labelstr
, optarg
, LBLSIZE
);
230 labelstr
[LBLSIZE
-1] = '\0';
231 if (strlen(optarg
) > LBLSIZE
-1) {
233 "WARNING Label `%s' is larger than limit of %d characters.\n",
235 msg("WARNING: Using truncated label `%s'.\n",
240 case 'M': /* multi-volume flag */
244 case 'n': /* notify operators */
248 case 's': /* tape size, feet */
249 tsize
= numarg("tape size", 1L, 0L) * 12 * 10;
253 sizest
= 1; /* return size estimate only */
256 case 'T': /* time of last dump */
257 spcl
.c_ddate
= unctime(optarg
);
258 if (spcl
.c_ddate
< 0) {
259 (void)fprintf(stderr
, "bad time \"%s\"\n",
267 case 'u': /* update dumpdates */
271 case 'W': /* what to do */
274 exit(X_FINOK
); /* do nothing else */
283 (void)fprintf(stderr
, "Must specify disk or filesystem\n");
289 (void)fprintf(stderr
, "Unknown arguments to dump:");
291 (void)fprintf(stderr
, " %s", *argv
++);
292 (void)fprintf(stderr
, "\n");
295 if (Tflag
&& uflag
) {
296 (void)fprintf(stderr
,
297 "You cannot use the T and u flags together.\n");
300 if (strcmp(tapeprefix
, "-") == 0) {
302 tapeprefix
= "standard output";
306 blocksperfile
= blocksperfile
/ ntrec
* ntrec
; /* round down */
307 else if (!unlimited
) {
309 * Determine how to default tape size and density
312 * 9-track 1600 bpi (160 bytes/.1") 2300 ft.
313 * 9-track 6250 bpi (625 bytes/.1") 2300 ft.
314 * cartridge 8000 bpi (100 bytes/.1") 1700 ft.
316 * hilit19 hits again: "
319 density
= cartridge
? 100 : 160;
321 tsize
= cartridge
? 1700L*120L : 2300L*120L;
324 if (strchr(tapeprefix
, ':')) {
326 tapeprefix
= strchr(host
, ':');
327 *tapeprefix
++ = '\0';
329 if (index(tapeprefix
, '\n')) {
330 (void)fprintf(stderr
, "invalid characters in tape\n");
333 if (rmthost(host
) == 0)
336 (void)fprintf(stderr
, "remote dump not enabled\n");
340 (void)setuid(getuid()); /* rmthost() is the only reason to be setuid */
342 if (signal(SIGHUP
, SIG_IGN
) != SIG_IGN
)
344 if (signal(SIGTRAP
, SIG_IGN
) != SIG_IGN
)
345 signal(SIGTRAP
, sig
);
346 if (signal(SIGFPE
, SIG_IGN
) != SIG_IGN
)
348 if (signal(SIGBUS
, SIG_IGN
) != SIG_IGN
)
350 if (signal(SIGSEGV
, SIG_IGN
) != SIG_IGN
)
351 signal(SIGSEGV
, sig
);
352 if (signal(SIGTERM
, SIG_IGN
) != SIG_IGN
)
353 signal(SIGTERM
, sig
);
354 if (signal(SIGINT
, interrupt
) == SIG_IGN
)
355 signal(SIGINT
, SIG_IGN
);
356 set_operators(); /* /etc/group snarfed */
357 getfstab(); /* /etc/fstab snarfed */
359 * disk may end in / and this can confuse
362 if (strlen(disk
) > 1 && disk
[strlen(disk
) - 1] == '/')
363 disk
[strlen(disk
) - 1] = '\0';
365 * disk can be either the full special file name,
366 * the suffix of the special file name,
367 * the special name missing the leading '/',
368 * the file system name with or without the leading '/'.
370 if ((dt
= fstabsearch(disk
)) != NULL
) {
371 disk
= rawname(dt
->fs_spec
);
372 (void)strncpy(spcl
.c_dev
, dt
->fs_spec
, NAMELEN
);
373 (void)strncpy(spcl
.c_filesys
, dt
->fs_file
, NAMELEN
);
377 * The argument was not found in the fstab
378 * assume that this is a subtree and search for it
381 if (realpath(disk
, pathname
) == NULL
)
383 strcpy(pathname
, disk
);
384 dt
= fstabsearchdir(pathname
, directory
);
386 char name
[MAXPATHLEN
];
387 (void)strncpy(spcl
.c_dev
, dt
->fs_spec
, NAMELEN
);
388 (void)sprintf(name
, "%s (dir %s)",
389 dt
->fs_file
, directory
);
390 (void)strncpy(spcl
.c_filesys
, name
, NAMELEN
);
391 disk
= rawname(dt
->fs_spec
);
393 (void)strncpy(spcl
.c_dev
, disk
, NAMELEN
);
394 (void)strncpy(spcl
.c_filesys
, "an unlisted file system",
400 (void)strncpy(spcl
.c_dev
, disk
, NAMELEN
);
401 (void)strncpy(spcl
.c_filesys
, "an unlisted file system",
405 spcl
.c_dev
[NAMELEN
-1]='\0';
406 spcl
.c_filesys
[NAMELEN
-1]='\0';
407 (void)strncpy(spcl
.c_label
, labelstr
, sizeof(spcl
.c_label
) - 1);
408 (void)gethostname(spcl
.c_host
, NAMELEN
);
409 spcl
.c_level
= level
- '0';
410 spcl
.c_type
= TS_TAPE
;
412 getdumptime(uflag
); /* dumpdates snarfed */
414 if (spcl
.c_ddate
== 0 && spcl
.c_level
) {
415 msg("WARNING: There is no inferior level dump on this filesystem\n");
416 msg("WARNING: Assuming a level 0 dump by default\n");
422 snprintf(tape
, NAME_MAX
, "%s%03d", tapeprefix
, tapeno
+ 1);
424 strncpy(tape
, tapeprefix
, NAME_MAX
);
425 tape
[NAME_MAX
- 1] = '\0';
429 msg("Date of this level %c dump: %s", level
,
431 spcl
.c_date
== 0 ? "the epoch\n" : ctime4(&spcl
.c_date
));
433 spcl
.c_date
== 0 ? "the epoch\n" : ctime(&spcl
.c_date
));
435 msg("Date of last level %c dump: %s", lastlevel
,
437 spcl
.c_ddate
== 0 ? "the epoch\n" : ctime4(&spcl
.c_ddate
));
439 spcl
.c_ddate
== 0 ? "the epoch\n" : ctime(&spcl
.c_ddate
));
441 msg("Dumping %s (%s) ", disk
, spcl
.c_filesys
);
443 msgtail("to %s on host %s\n", tape
, host
);
445 msgtail("to %s\n", tape
);
446 msg("Label: %s\n", labelstr
);
448 } /* end of size estimate */
451 retval
= dump_fs_open(disk
, &fs
);
453 com_err(disk
, retval
, "while opening filesystem");
454 if (retval
== EXT2_ET_REV_TOO_HIGH
)
455 printf ("Get a newer version of dump!\n");
458 if (fs
->super
->s_rev_level
> DUMP_CURRENT_REV
) {
459 com_err(disk
, retval
, "while opening filesystem");
460 printf ("Get a newer version of dump!\n");
463 if ((diskfd
= open(disk
, O_RDONLY
)) < 0) {
464 msg("Cannot open %s\n", disk
);
468 dev_bsize
= DEV_BSIZE
;
469 dev_bshift
= ffs(dev_bsize
) - 1;
470 if (dev_bsize
!= (1 << dev_bshift
))
471 quit("dev_bsize (%d) is not a power of 2", dev_bsize
);
472 tp_bshift
= ffs(TP_BSIZE
) - 1;
473 if (TP_BSIZE
!= (1 << tp_bshift
))
474 quit("TP_BSIZE (%d) is not a power of 2", TP_BSIZE
);
475 maxino
= fs
->super
->s_inodes_count
;
477 spcl
.c_flags
|= DR_NEWINODEFMT
;
479 #else /* __linux __*/
480 if ((diskfd
= open(disk
, O_RDONLY
)) < 0) {
481 msg("Cannot open %s\n", disk
);
485 sblock
= (struct fs
*)sblock_buf
;
486 bread(SBOFF
, (char *) sblock
, SBSIZE
);
487 if (sblock
->fs_magic
!= FS_MAGIC
)
488 quit("bad sblock magic number\n");
489 dev_bsize
= sblock
->fs_fsize
/ fsbtodb(sblock
, 1);
490 dev_bshift
= ffs(dev_bsize
) - 1;
491 if (dev_bsize
!= (1 << dev_bshift
))
492 quit("dev_bsize (%d) is not a power of 2", dev_bsize
);
493 tp_bshift
= ffs(TP_BSIZE
) - 1;
494 if (TP_BSIZE
!= (1 << tp_bshift
))
495 quit("TP_BSIZE (%d) is not a power of 2", TP_BSIZE
);
497 if (sblock
->fs_inodefmt
>= FS_44INODEFMT
)
498 spcl
.c_flags
|= DR_NEWINODEFMT
;
500 maxino
= sblock
->fs_ipg
* sblock
->fs_ncg
;
501 #endif /* __linux__ */
502 mapsize
= roundup(howmany(maxino
, NBBY
), TP_BSIZE
);
503 usedinomap
= (char *)calloc((unsigned) mapsize
, sizeof(char));
504 dumpdirmap
= (char *)calloc((unsigned) mapsize
, sizeof(char));
505 dumpinomap
= (char *)calloc((unsigned) mapsize
, sizeof(char));
506 tapesize
= 3 * (howmany(mapsize
* sizeof(char), TP_BSIZE
) + 1);
508 nonodump
= spcl
.c_level
< honorlevel
;
511 (void)signal(SIGINFO
, statussig
);
515 msg("mapping (Pass I) [regular files]\n");
517 if (directory
[0] == 0)
518 anydirskipped
= mapfiles(maxino
, &tapesize
);
520 anydirskipped
= mapfilesfromdir(maxino
, &tapesize
, directory
);
522 anydirskipped
= mapfiles(maxino
, &tapesize
);
526 msg("mapping (Pass II) [directories]\n");
527 while (anydirskipped
) {
528 anydirskipped
= mapdirs(maxino
, &tapesize
);
532 printf("%.0f\n", ((double)tapesize
+ 10) * TP_BSIZE
);
534 } /* stop here for size estimate */
536 if (pipeout
|| unlimited
) {
537 tapesize
+= 10; /* 10 trailer blocks */
538 msg("estimated %ld tape blocks.\n", tapesize
);
543 fetapes
= (double) tapesize
/ blocksperfile
;
544 else if (cartridge
) {
545 /* Estimate number of tapes, assuming streaming stops at
546 the end of each block written, and not in mid-block.
547 Assume no erroneous blocks; this can be compensated
548 for with an artificially low tape size. */
550 ( (double) tapesize
/* blocks */
551 * TP_BSIZE
/* bytes/block */
552 * (1.0/density
) /* 0.1" / byte " */
554 (double) tapesize
/* blocks */
555 * (1.0/ntrec
) /* streaming-stops per block */
556 * 15.48 /* 0.1" / streaming-stop " */
557 ) * (1.0 / tsize
); /* tape / 0.1" " */
559 /* Estimate number of tapes, for old fashioned 9-track
561 int tenthsperirg
= (density
== 625) ? 3 : 7;
563 ( (double) tapesize
/* blocks */
564 * TP_BSIZE
/* bytes / block */
565 * (1.0/density
) /* 0.1" / byte " */
567 (double) tapesize
/* blocks */
568 * (1.0/ntrec
) /* IRG's / block */
569 * tenthsperirg
/* 0.1" / IRG " */
570 ) * (1.0 / tsize
); /* tape / 0.1" " */
572 etapes
= fetapes
; /* truncating assignment */
574 /* count the dumped inodes map on each additional tape */
575 tapesize
+= (etapes
- 1) *
576 (howmany(mapsize
* sizeof(char), TP_BSIZE
) + 1);
577 tapesize
+= etapes
+ 10; /* headers + 10 trailer blks */
578 msg("estimated %ld tape blocks on %3.2f tape(s).\n",
583 * Allocate tape buffer.
587 "can't allocate tape buffers - try a smaller blocking factor.\n");
591 (void)time4(&(tstart_writing
));
593 (void)time((time_t *)&(tstart_writing
));
595 dumpmap(usedinomap
, TS_CLRI
, maxino
- 1);
597 msg("dumping (Pass III) [directories]\n");
598 dirty
= 0; /* XXX just to get gcc to shut up */
599 for (map
= dumpdirmap
, ino
= 1; ino
< maxino
; ino
++) {
600 if (((ino
- 1) % NBBY
) == 0) /* map is offset by 1 */
604 if ((dirty
& 1) == 0)
607 * Skip directory inodes deleted and maybe reallocated
610 if ((dp
->di_mode
& IFMT
) != IFDIR
)
614 * Skip directory inodes deleted and not yes reallocated...
616 if (dp
->di_nlink
== 0 || dp
->di_dtime
!= 0)
618 (void)dumpdirino(dp
, ino
);
620 (void)dumpino(dp
, ino
);
624 msg("dumping (Pass IV) [regular files]\n");
625 for (map
= dumpinomap
, ino
= 1; ino
< maxino
; ino
++) {
626 if (((ino
- 1) % NBBY
) == 0) /* map is offset by 1 */
630 if ((dirty
& 1) == 0)
633 * Skip inodes deleted and reallocated as directories.
636 if ((dp
->di_mode
& IFMT
) == IFDIR
)
640 * No need to check here for deleted and not yes reallocated inodes
641 * since this is done in dumpino().
644 (void)dumpino(dp
, ino
);
648 (void)time4(&(tend_writing
));
650 (void)time((time_t *)&(tend_writing
));
652 spcl
.c_type
= TS_END
;
653 for (i
= 0; i
< ntrec
; i
++)
654 writeheader(maxino
- 1);
656 msg("DUMP: %ld tape blocks\n", spcl
.c_tapea
);
658 msg("DUMP: %ld tape blocks on %d volumes(s)\n",
659 spcl
.c_tapea
, spcl
.c_volume
);
661 /* report dump performance, avoid division through zero */
662 if (tend_writing
- tstart_writing
== 0)
663 msg("finished in less than a second\n");
665 msg("finished in %d seconds, throughput %d KBytes/sec\n",
666 tend_writing
- tstart_writing
,
667 spcl
.c_tapea
/ (tend_writing
- tstart_writing
));
672 msg("DUMP: Date of this level %c dump: %s", level
,
673 spcl
.c_date
== 0 ? "the epoch\n" : ctime4(&spcl
.c_date
));
675 msg("DUMP: Date of this level %c dump: %s", level
,
676 spcl
.c_date
== 0 ? "the epoch\n" : ctime(&spcl
.c_date
));
678 msg("DUMP: Date this dump completed: %s", ctime(&tnow
));
680 msg("DUMP: Average transfer rate: %ld KB/s\n", xferrate
/ tapeno
);
683 broadcast("DUMP IS DONE!\7\7\n");
684 msg("DUMP IS DONE\n");
687 return 0; /* gcc - shut up */
693 char white
[MAXPATHLEN
];
696 strncpy(white
, __progname
, MAXPATHLEN
-1);
697 white
[MAXPATHLEN
-1] = '\0';
698 for (i
=0; i
<MAXPATHLEN
; ++i
)
699 if (white
[i
] != '\0') white
[i
] = ' ';
702 "%s %s\n", __progname
, _DUMP_VERSION
);
704 "usage:\t%s [-0123456789ac"
708 "MnSu] [-B records] [-b blocksize] [-d density]\n"
709 "\t%s [-e inode#] [-f file] [-h level] [-s feet] [-T date] filesystem\n"
710 "\t%s [-W | -w]\n", __progname
, white
, __progname
);
715 * Pick up a numeric argument. It must be nonnegative and in the given
716 * range (except that a vmax of 0 means unlimited).
719 numarg(const char *meaning
, long vmin
, long vmax
)
724 val
= strtol(optarg
, &p
, 10);
726 errx(X_STARTUP
, "illegal %s -- %s", meaning
, optarg
);
727 if (val
< vmin
|| (vmax
&& val
> vmax
))
728 errx(X_STARTUP
, "%s must be between %ld and %ld", meaning
, vmin
, vmax
);
743 quit("Signal on pipe: cannot recover\n");
744 msg("Rewriting attempted as response to unknown signal.\n");
745 (void)fflush(stderr
);
746 (void)fflush(stdout
);
751 msg("SIGSEGV: ABORTING!\n");
752 (void)signal(SIGSEGV
, SIG_DFL
);
753 (void)kill(0, SIGSEGV
);
763 #else /* __linux__ */
764 static char rawbuf
[MAXPATHLEN
];
765 char *dp
= strrchr(cp
, '/');
770 (void)strncpy(rawbuf
, cp
, MAXPATHLEN
- 1);
771 rawbuf
[MAXPATHLEN
-1] = '\0';
773 (void)strncat(rawbuf
, "/r", MAXPATHLEN
- 1 - strlen(rawbuf
));
774 (void)strncat(rawbuf
, dp
+ 1, MAXPATHLEN
- 1 - strlen(rawbuf
));
776 #endif /* __linux__ */
781 * Change set of key letters and ordered arguments into something
782 * getopt(3) will like.
785 obsolete(int *argcp
, char **argvp
[])
788 char *ap
, **argv
, *flagsp
=NULL
, **nargv
, *p
=NULL
;
794 /* Return if no arguments or first argument has leading dash. */
796 if (argc
== 1 || *ap
== '-')
799 /* Allocate space for new arguments. */
800 if ((*argvp
= nargv
= malloc((argc
+ 1) * sizeof(char *))) == NULL
||
801 (p
= flagsp
= malloc(strlen(ap
) + 2)) == NULL
)
802 err(X_STARTUP
, "malloc new args");
807 for (flags
= 0; *ap
; ++ap
) {
817 warnx("option requires an argument -- %c", *ap
);
820 if ((nargv
[0] = malloc(strlen(*argv
) + 2 + 1)) == NULL
)
821 err(X_STARTUP
, "malloc arg");
824 (void)strcpy(&nargv
[0][2], *argv
);
838 /* Terminate flags. */
844 /* Copy remaining arguments. */
845 while ((*nargv
++ = *argv
++));
847 /* Update argument count. */
848 *argcp
= nargv
- *argvp
- 1;