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freebsd-dev/sbin/dump/main.c
Kirk McKusick b21582ee03 Add a flags parameter to the ffs_sbget() function that reads UFS superblocks. 
Rather than trying to shoehorn flags into the requested superblock
address, create a separate flags parameter to the ffs_sbget()
function in sys/ufs/ffs/ffs_subr.c. The ffs_sbget() function is
used both in the kernel and in user-level utilities through export
to the sbget() function in the libufs(3) library (see sbget(3)
for details). The kernel uses ffs_sbget() when mounting UFS
filesystems, in the glabel(8) and gjournal(8) GEOM utilities,
and in the standalone library used when booting the system
from a UFS root filesystem.

The ffs_sbget() function reads the superblock located at the byte
offset specified by its sblockloc parameter. The value UFS_STDSB
may be specified for sblockloc to request that the standard
location for the superblock be read.

The two existing options are now flags:

UFS_NOHASHFAIL will note if the check hash is wrong but will still
   return the superblock. This is used by the bootstrap code to
   give the system a chance to come up so that fsck can be run to
   correct the problem.

UFS_NOMSG indicates that superblock inconsistency error messages
   should not be printed. It is used by programs like fsck that
   want to print their own error message and programs like glabel(8)
   that just want to know if a UFS filesystem exists on a partition.

One additional flag is added:

UFS_NOCSUM causes only the superblock itself to be returned, but does
   not read in any auxiliary data structures like the cylinder group
   summary information. It is used by clients like glabel(8) that
   just want to check for possible filesystem types. Using UFS_NOCSUM
   skips the superblock checks for csum data which allows superblocks
   that have corrupted csum data to be read and used.

The validate_sblock() function checks that the superblock has not
been corrupted in a way that can crash or hang the system. Unless
the UFS_NOMSG flag is specified, it will print out any errors that
it finds. Prior to this commit, validate_sblock() returned as soon
as it found an inconsistency so would print at most one message.
It now does all its checks so when UFS_NOMSG has not been specified
will print out everything that it finds inconsistent.

Sponsored by: The FreeBSD Foundation
2022-07-30 22:51:38 -07:00

798 lines
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1980, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1980, 1991, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/1/95";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/disklabel.h>
#include <ufs/ufs/extattr.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ffs/fs.h>
#include <protocols/dumprestore.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fstab.h>
#include <libufs.h>
#include <limits.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <timeconv.h>
#include <unistd.h>
#include "dump.h"
#include "pathnames.h"
int mapsize; /* size of the state maps */
char *usedinomap; /* map of allocated inodes */
char *dumpdirmap; /* map of directories to be dumped */
char *dumpinomap; /* map of files to be dumped */
char *disk; /* name of the disk file */
char *tape; /* name of the tape file */
char *popenout; /* popen(3) per-"tape" command */
int level; /* dump level of this dump */
int uflag; /* update flag */
int diskfd; /* disk file descriptor */
int pipeout; /* true => output to standard output */
int density = 0; /* density in bytes/0.1" " <- this is for hilit19 */
long tapesize; /* estimated tape size, blocks */
long tsize; /* tape size in 0.1" units */
int etapes; /* estimated number of tapes */
int nonodump; /* if set, do not honor UF_NODUMP user flags */
int unlimited; /* if set, write to end of medium */
int cachesize = 0; /* block cache size (in bytes), defaults to 0 */
int rsync_friendly; /* be friendly with rsync */
int notify = 0; /* notify operator flag */
int blockswritten = 0; /* number of blocks written on current tape */
int tapeno = 0; /* current tape number */
int ntrec = NTREC; /* # tape blocks in each tape record */
long blocksperfile; /* number of blocks per output file */
int cartridge = 0; /* Assume non-cartridge tape */
char *host = NULL; /* remote host (if any) */
time_t tstart_writing; /* when started writing the first tape block */
time_t tend_writing; /* after writing the last tape block */
int passno; /* current dump pass number */
struct fs *sblock; /* the file system super block */
long dev_bsize = 1; /* recalculated below */
int dev_bshift; /* log2(dev_bsize) */
int tp_bshift; /* log2(TP_BSIZE) */
int snapdump = 0; /* dumping live filesystem, so use snapshot */
static char *getmntpt(char *, int *);
static long numarg(const char *, long, long);
static void obsolete(int *, char **[]);
static void usage(void) __dead2;
int
main(int argc, char *argv[])
{
struct stat sb;
ino_t ino;
int dirty;
union dinode *dp;
struct fstab *dt;
char *map, *mntpt;
int ch, mode, mntflags;
int i, ret, anydirskipped, bflag = 0, Tflag = 0, honorlevel = 1;
int just_estimate = 0;
ino_t maxino;
char *tmsg;
spcl.c_date = _time_to_time64(time(NULL));
tsize = 0; /* Default later, based on 'c' option for cart tapes */
dumpdates = _PATH_DUMPDATES;
popenout = NULL;
tape = NULL;
if (TP_BSIZE / DEV_BSIZE == 0 || TP_BSIZE % DEV_BSIZE != 0)
quit("TP_BSIZE must be a multiple of DEV_BSIZE\n");
level = 0;
rsync_friendly = 0;
if (argc < 2)
usage();
obsolete(&argc, &argv);
while ((ch = getopt(argc, argv,
"0123456789aB:b:C:cD:d:f:h:LnP:RrSs:T:uWw")) != -1)
switch (ch) {
/* dump level */
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
level = 10 * level + ch - '0';
break;
case 'a': /* `auto-size', Write to EOM. */
unlimited = 1;
break;
case 'B': /* blocks per output file */
blocksperfile = numarg("number of blocks per file",
1L, 0L);
break;
case 'b': /* blocks per tape write */
ntrec = numarg("number of blocks per write",
1L, 1000L);
break;
case 'C':
cachesize = numarg("cachesize", 0, 0) * 1024 * 1024;
break;
case 'c': /* Tape is cart. not 9-track */
cartridge = 1;
break;
case 'D':
dumpdates = optarg;
break;
case 'd': /* density, in bits per inch */
density = numarg("density", 10L, 327670L) / 10;
if (density >= 625 && !bflag)
ntrec = HIGHDENSITYTREC;
break;
case 'f': /* output file */
if (popenout != NULL)
errx(X_STARTUP, "You cannot use the P and f "
"flags together.\n");
tape = optarg;
break;
case 'h':
honorlevel = numarg("honor level", 0L, 10L);
break;
case 'L':
snapdump = 1;
break;
case 'n': /* notify operators */
notify = 1;
break;
case 'P':
if (tape != NULL)
errx(X_STARTUP, "You cannot use the P and f "
"flags together.\n");
popenout = optarg;
break;
case 'r': /* store slightly less data to be friendly to rsync */
if (rsync_friendly < 1)
rsync_friendly = 1;
break;
case 'R': /* store even less data to be friendlier to rsync */
if (rsync_friendly < 2)
rsync_friendly = 2;
break;
case 'S': /* exit after estimating # of tapes */
just_estimate = 1;
break;
case 's': /* tape size, feet */
tsize = numarg("tape size", 1L, 0L) * 12 * 10;
break;
case 'T': /* time of last dump */
spcl.c_ddate = unctime(optarg);
if (spcl.c_ddate < 0) {
(void)fprintf(stderr, "bad time \"%s\"\n",
optarg);
exit(X_STARTUP);
}
Tflag = 1;
lastlevel = -1;
break;
case 'u': /* update /etc/dumpdates */
uflag = 1;
break;
case 'W': /* what to do */
case 'w':
lastdump(ch);
exit(X_FINOK); /* do nothing else */
default:
usage();
}
argc -= optind;
argv += optind;
if (argc < 1) {
(void)fprintf(stderr, "Must specify disk or file system\n");
exit(X_STARTUP);
}
disk = *argv++;
argc--;
if (argc >= 1) {
(void)fprintf(stderr, "Unknown arguments to dump:");
while (argc--)
(void)fprintf(stderr, " %s", *argv++);
(void)fprintf(stderr, "\n");
exit(X_STARTUP);
}
if (rsync_friendly && (level > 0)) {
(void)fprintf(stderr, "%s %s\n", "rsync friendly options",
"can be used only with level 0 dumps.");
exit(X_STARTUP);
}
if (Tflag && uflag) {
(void)fprintf(stderr,
"You cannot use the T and u flags together.\n");
exit(X_STARTUP);
}
if (popenout) {
tape = "child pipeline process";
} else if (tape == NULL && (tape = getenv("TAPE")) == NULL)
tape = _PATH_DEFTAPE;
if (strcmp(tape, "-") == 0) {
pipeout++;
tape = "standard output";
}
if (blocksperfile)
blocksperfile = rounddown(blocksperfile, ntrec);
else if (!unlimited) {
/*
* Determine how to default tape size and density
*
* density tape size
* 9-track 1600 bpi (160 bytes/.1") 2300 ft.
* 9-track 6250 bpi (625 bytes/.1") 2300 ft.
* cartridge 8000 bpi (100 bytes/.1") 1700 ft.
* (450*4 - slop)
* hilit19 hits again: "
*/
if (density == 0)
density = cartridge ? 100 : 160;
if (tsize == 0)
tsize = cartridge ? 1700L*120L : 2300L*120L;
}
if (strchr(tape, ':')) {
host = tape;
tape = strchr(host, ':');
*tape++ = '\0';
#ifdef RDUMP
if (strchr(tape, '\n')) {
(void)fprintf(stderr, "invalid characters in tape\n");
exit(X_STARTUP);
}
if (rmthost(host) == 0)
exit(X_STARTUP);
#else
(void)fprintf(stderr, "remote dump not enabled\n");
exit(X_STARTUP);
#endif
}
(void)setuid(getuid()); /* rmthost() is the only reason to be setuid */
if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
signal(SIGHUP, sig);
if (signal(SIGTRAP, SIG_IGN) != SIG_IGN)
signal(SIGTRAP, sig);
if (signal(SIGFPE, SIG_IGN) != SIG_IGN)
signal(SIGFPE, sig);
if (signal(SIGBUS, SIG_IGN) != SIG_IGN)
signal(SIGBUS, sig);
if (signal(SIGSEGV, SIG_IGN) != SIG_IGN)
signal(SIGSEGV, sig);
if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
signal(SIGTERM, sig);
if (signal(SIGINT, interrupt) == SIG_IGN)
signal(SIGINT, SIG_IGN);
dump_getfstab(); /* /etc/fstab snarfed */
/*
* disk can be either the full special file name,
* the suffix of the special file name,
* the special name missing the leading '/',
* the file system name with or without the leading '/'.
*/
dt = fstabsearch(disk);
if (dt != NULL) {
disk = rawname(dt->fs_spec);
if (disk == NULL)
errx(X_STARTUP, "%s: unknown file system", dt->fs_spec);
(void)strncpy(spcl.c_dev, dt->fs_spec, NAMELEN);
(void)strncpy(spcl.c_filesys, dt->fs_file, NAMELEN);
} else {
(void)strncpy(spcl.c_dev, disk, NAMELEN);
(void)strncpy(spcl.c_filesys, "an unlisted file system",
NAMELEN);
}
spcl.c_dev[NAMELEN-1]='\0';
spcl.c_filesys[NAMELEN-1]='\0';
if ((mntpt = getmntpt(disk, &mntflags)) != NULL) {
if (mntflags & MNT_RDONLY) {
if (snapdump != 0) {
msg("WARNING: %s\n",
"-L ignored for read-only filesystem.");
snapdump = 0;
}
} else if (snapdump == 0) {
msg("WARNING: %s\n",
"should use -L when dumping live read-write "
"filesystems!");
} else {
char snapname[BUFSIZ], snapcmd[BUFSIZ];
snprintf(snapname, sizeof snapname, "%s/.snap", mntpt);
if ((stat(snapname, &sb) < 0) || !S_ISDIR(sb.st_mode)) {
msg("WARNING: %s %s\n",
"-L requested but snapshot location",
snapname);
msg(" %s: %s\n",
"is not a directory",
"dump downgraded, -L ignored");
snapdump = 0;
} else {
snprintf(snapname, sizeof snapname,
"%s/.snap/dump_snapshot", mntpt);
snprintf(snapcmd, sizeof snapcmd, "%s %s %s",
_PATH_MKSNAP_FFS, mntpt, snapname);
unlink(snapname);
if (system(snapcmd) != 0)
errx(X_STARTUP, "Cannot create %s: %s\n",
snapname, strerror(errno));
if ((diskfd = open(snapname, O_RDONLY)) < 0) {
unlink(snapname);
errx(X_STARTUP, "Cannot open %s: %s\n",
snapname, strerror(errno));
}
unlink(snapname);
if (fstat(diskfd, &sb) != 0)
err(X_STARTUP, "%s: stat", snapname);
spcl.c_date = _time_to_time64(sb.st_mtime);
}
}
} else if (snapdump != 0) {
msg("WARNING: Cannot use -L on an unmounted filesystem.\n");
snapdump = 0;
}
if (snapdump == 0) {
if ((diskfd = open(disk, O_RDONLY)) < 0)
err(X_STARTUP, "Cannot open %s", disk);
if (fstat(diskfd, &sb) != 0)
err(X_STARTUP, "%s: stat", disk);
if (S_ISDIR(sb.st_mode))
errx(X_STARTUP, "%s: unknown file system", disk);
}
(void)strcpy(spcl.c_label, "none");
(void)gethostname(spcl.c_host, NAMELEN);
spcl.c_level = level;
spcl.c_type = TS_TAPE;
if (rsync_friendly) {
/* don't store real dump times */
spcl.c_date = 0;
spcl.c_ddate = 0;
}
if (spcl.c_date == 0) {
tmsg = "the epoch\n";
} else {
time_t t = _time64_to_time(spcl.c_date);
tmsg = ctime(&t);
}
msg("Date of this level %d dump: %s", level, tmsg);
if (!Tflag && (!rsync_friendly))
getdumptime(); /* /etc/dumpdates snarfed */
if (spcl.c_ddate == 0) {
tmsg = "the epoch\n";
} else {
time_t t = _time64_to_time(spcl.c_ddate);
tmsg = ctime(&t);
}
if (lastlevel < 0)
msg("Date of last (level unknown) dump: %s", tmsg);
else
msg("Date of last level %d dump: %s", lastlevel, tmsg);
msg("Dumping %s%s ", snapdump ? "snapshot of ": "", disk);
if (dt != NULL)
msgtail("(%s) ", dt->fs_file);
if (host)
msgtail("to %s on host %s\n", tape, host);
else
msgtail("to %s\n", tape);
sync();
if ((ret = sbget(diskfd, &sblock, UFS_STDSB, UFS_NOCSUM)) != 0) {
switch (ret) {
case ENOENT:
warn("Cannot find file system superblock");
return (1);
default:
warn("Unable to read file system superblock");
return (1);
}
}
dev_bsize = sblock->fs_fsize / fsbtodb(sblock, 1);
dev_bshift = ffs(dev_bsize) - 1;
if (dev_bsize != (1 << dev_bshift))
quit("dev_bsize (%ld) is not a power of 2", dev_bsize);
tp_bshift = ffs(TP_BSIZE) - 1;
if (TP_BSIZE != (1 << tp_bshift))
quit("TP_BSIZE (%d) is not a power of 2", TP_BSIZE);
maxino = sblock->fs_ipg * sblock->fs_ncg;
mapsize = roundup(howmany(maxino, CHAR_BIT), TP_BSIZE);
usedinomap = (char *)calloc((unsigned) mapsize, sizeof(char));
dumpdirmap = (char *)calloc((unsigned) mapsize, sizeof(char));
dumpinomap = (char *)calloc((unsigned) mapsize, sizeof(char));
tapesize = 3 * (howmany(mapsize * sizeof(char), TP_BSIZE) + 1);
nonodump = spcl.c_level < honorlevel;
passno = 1;
setproctitle("%s: pass 1: regular files", disk);
msg("mapping (Pass I) [regular files]\n");
anydirskipped = mapfiles(maxino, &tapesize);
passno = 2;
setproctitle("%s: pass 2: directories", disk);
msg("mapping (Pass II) [directories]\n");
while (anydirskipped) {
anydirskipped = mapdirs(maxino, &tapesize);
}
if (pipeout || unlimited) {
tapesize += 10; /* 10 trailer blocks */
msg("estimated %ld tape blocks.\n", tapesize);
} else {
double fetapes;
if (blocksperfile)
fetapes = (double) tapesize / blocksperfile;
else if (cartridge) {
/* Estimate number of tapes, assuming streaming stops at
the end of each block written, and not in mid-block.
Assume no erroneous blocks; this can be compensated
for with an artificially low tape size. */
fetapes =
( (double) tapesize /* blocks */
* TP_BSIZE /* bytes/block */
* (1.0/density) /* 0.1" / byte " */
+
(double) tapesize /* blocks */
* (1.0/ntrec) /* streaming-stops per block */
* 15.48 /* 0.1" / streaming-stop " */
) * (1.0 / tsize ); /* tape / 0.1" " */
} else {
/* Estimate number of tapes, for old fashioned 9-track
tape */
int tenthsperirg = (density == 625) ? 3 : 7;
fetapes =
( (double) tapesize /* blocks */
* TP_BSIZE /* bytes / block */
* (1.0/density) /* 0.1" / byte " */
+
(double) tapesize /* blocks */
* (1.0/ntrec) /* IRG's / block */
* tenthsperirg /* 0.1" / IRG " */
) * (1.0 / tsize ); /* tape / 0.1" " */
}
etapes = fetapes; /* truncating assignment */
etapes++;
/* count the dumped inodes map on each additional tape */
tapesize += (etapes - 1) *
(howmany(mapsize * sizeof(char), TP_BSIZE) + 1);
tapesize += etapes + 10; /* headers + 10 trailer blks */
msg("estimated %ld tape blocks on %3.2f tape(s).\n",
tapesize, fetapes);
}
/*
* If the user only wants an estimate of the number of
* tapes, exit now.
*/
if (just_estimate)
exit(0);
/*
* Allocate tape buffer.
*/
if (!alloctape())
quit(
"can't allocate tape buffers - try a smaller blocking factor.\n");
startnewtape(1);
(void)time((time_t *)&(tstart_writing));
dumpmap(usedinomap, TS_CLRI, maxino - 1);
passno = 3;
setproctitle("%s: pass 3: directories", disk);
msg("dumping (Pass III) [directories]\n");
dirty = 0; /* XXX just to get gcc to shut up */
for (map = dumpdirmap, ino = 1; ino < maxino; ino++) {
if (((ino - 1) % CHAR_BIT) == 0) /* map is offset by 1 */
dirty = *map++;
else
dirty >>= 1;
if ((dirty & 1) == 0)
continue;
/*
* Skip directory inodes deleted and maybe reallocated
*/
dp = getino(ino, &mode);
if (mode != IFDIR)
continue;
(void)dumpino(dp, ino);
}
passno = 4;
setproctitle("%s: pass 4: regular files", disk);
msg("dumping (Pass IV) [regular files]\n");
for (map = dumpinomap, ino = 1; ino < maxino; ino++) {
if (((ino - 1) % CHAR_BIT) == 0) /* map is offset by 1 */
dirty = *map++;
else
dirty >>= 1;
if ((dirty & 1) == 0)
continue;
/*
* Skip inodes deleted and reallocated as directories.
*/
dp = getino(ino, &mode);
if (mode == IFDIR)
continue;
(void)dumpino(dp, ino);
}
(void)time((time_t *)&(tend_writing));
spcl.c_type = TS_END;
for (i = 0; i < ntrec; i++)
writeheader(maxino - 1);
if (pipeout)
msg("DUMP: %jd tape blocks\n", (intmax_t)spcl.c_tapea);
else
msg("DUMP: %jd tape blocks on %d volume%s\n",
(intmax_t)spcl.c_tapea, spcl.c_volume,
(spcl.c_volume == 1) ? "" : "s");
/* report dump performance, avoid division through zero */
if (tend_writing - tstart_writing == 0)
msg("finished in less than a second\n");
else
msg("finished in %jd seconds, throughput %jd KBytes/sec\n",
(intmax_t)tend_writing - tstart_writing,
(intmax_t)(spcl.c_tapea /
(tend_writing - tstart_writing)));
putdumptime();
trewind();
broadcast("DUMP IS DONE!\a\a\n");
msg("DUMP IS DONE\n");
Exit(X_FINOK);
/* NOTREACHED */
}
static void
usage(void)
{
fprintf(stderr,
"usage: dump [-0123456789acLnSu] [-B records] [-b blocksize] [-C cachesize]\n"
" [-D dumpdates] [-d density] [-f file | -P pipecommand] [-h level]\n"
" [-s feet] [-T date] filesystem\n"
" dump -W | -w\n");
exit(X_STARTUP);
}
/*
* Check to see if a disk is currently mounted.
*/
static char *
getmntpt(char *name, int *mntflagsp)
{
long mntsize, i;
struct statfs *mntbuf;
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = 0; i < mntsize; i++) {
if (!strcmp(mntbuf[i].f_mntfromname, name)) {
*mntflagsp = mntbuf[i].f_flags;
return (mntbuf[i].f_mntonname);
}
}
return (0);
}
/*
* Pick up a numeric argument. It must be nonnegative and in the given
* range (except that a vmax of 0 means unlimited).
*/
static long
numarg(const char *meaning, long vmin, long vmax)
{
char *p;
long val;
val = strtol(optarg, &p, 10);
if (*p)
errx(1, "illegal %s -- %s", meaning, optarg);
if (val < vmin || (vmax && val > vmax))
errx(1, "%s must be between %ld and %ld", meaning, vmin, vmax);
return (val);
}
void
sig(int signo)
{
switch(signo) {
case SIGALRM:
case SIGBUS:
case SIGFPE:
case SIGHUP:
case SIGTERM:
case SIGTRAP:
if (pipeout)
quit("Signal on pipe: cannot recover\n");
msg("Rewriting attempted as response to unknown signal.\n");
(void)fflush(stderr);
(void)fflush(stdout);
close_rewind();
exit(X_REWRITE);
/* NOTREACHED */
case SIGSEGV:
msg("SIGSEGV: ABORTING!\n");
(void)signal(SIGSEGV, SIG_DFL);
(void)kill(0, SIGSEGV);
/* NOTREACHED */
}
}
char *
rawname(char *cp)
{
struct stat sb;
/*
* Ensure that the device passed in is a raw device.
*/
if (stat(cp, &sb) == 0 && (sb.st_mode & S_IFMT) == S_IFCHR)
return (cp);
/*
* Since there's only one device type now, we can't construct any
* better name, so we have to return NULL.
*/
return (NULL);
}
/*
* obsolete --
* Change set of key letters and ordered arguments into something
* getopt(3) will like.
*/
static void
obsolete(int *argcp, char **argvp[])
{
int argc, flags;
char *ap, **argv, *flagsp, **nargv, *p;
/* Setup. */
argv = *argvp;
argc = *argcp;
/*
* Return if no arguments or first argument has leading
* dash or slash.
*/
ap = argv[1];
if (argc == 1 || *ap == '-' || *ap == '/')
return;
/* Allocate space for new arguments. */
if ((*argvp = nargv = malloc((argc + 1) * sizeof(char *))) == NULL ||
(p = flagsp = malloc(strlen(ap) + 2)) == NULL)
err(1, NULL);
*nargv++ = *argv;
argv += 2;
for (flags = 0; *ap; ++ap) {
switch (*ap) {
case 'B':
case 'b':
case 'd':
case 'f':
case 'D':
case 'C':
case 'h':
case 's':
case 'T':
if (*argv == NULL) {
warnx("option requires an argument -- %c", *ap);
usage();
}
if ((nargv[0] = malloc(strlen(*argv) + 2 + 1)) == NULL)
err(1, NULL);
nargv[0][0] = '-';
nargv[0][1] = *ap;
(void)strcpy(&nargv[0][2], *argv);
++argv;
++nargv;
break;
default:
if (!flags) {
*p++ = '-';
flags = 1;
}
*p++ = *ap;
break;
}
}
/* Terminate flags. */
if (flags) {
*p = '\0';
*nargv++ = flagsp;
} else
free(flagsp);
/* Copy remaining arguments. */
while ((*nargv++ = *argv++));
/* Update argument count. */
*argcp = nargv - *argvp - 1;
}
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