1 /* $OpenBSD: ar_io.c,v 1.18 1998/09/20 02:22:21 millert Exp $ */
2 /* $NetBSD: ar_io.c,v 1.5 1996/03/26 23:54:13 mrg Exp $ */
5 * Copyright (c) 1992 Keith Muller.
6 * Copyright (c) 1992, 1993
7 * The Regents of the University of California. All rights reserved.
9 * This code is derived from software contributed to Berkeley by
10 * Keith Muller of the University of California, San Diego.
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
43 static char sccsid[] = "@(#)ar_io.c 8.2 (Berkeley) 4/18/94";
45 static char rcsid[] = "$OpenBSD: ar_io.c,v 1.18 1998/09/20 02:22:21 millert Exp $";
49 #include <sys/types.h>
52 #include <sys/ioctl.h>
54 #include <sys/param.h>
68 * Routines which deal directly with the archive I/O device/file.
71 #define DMOD 0666 /* default mode of created archives */
72 #define EXT_MODE O_RDONLY /* open mode for list/extract */
73 #define AR_MODE (O_WRONLY | O_CREAT | O_TRUNC) /* mode for archive */
74 #define APP_MODE O_RDWR /* mode for append */
75 #define STDO "<STDOUT>" /* psuedo name for stdout */
76 #define STDN "<STDIN>" /* psuedo name for stdin */
77 static int arfd = -1; /* archive file descriptor */
78 static int artyp = ISREG; /* archive type: file/FIFO/tape */
79 static int arvol = 1; /* archive volume number */
80 static int lstrval = -1; /* return value from last i/o */
81 static int io_ok; /* i/o worked on volume after resync */
82 static int did_io; /* did i/o ever occur on volume? */
83 static int done; /* set via tty termination */
84 static struct stat arsb; /* stat of archive device at open */
85 static int invld_rec; /* tape has out of spec record size */
86 static int wr_trail = 1; /* trailer was rewritten in append */
87 static int can_unlnk = 0; /* do we unlink null archives? */
88 char *arcname; /* printable name of archive */
89 char *gzip_program; /* name of gzip program */
91 static int get_phys __P((void));
92 extern sigset_t s_mask;
93 static void ar_start_gzip __P((int));
97 * Opens the next archive volume. Determines the type of the device and
98 * sets up block sizes as required by the archive device and the format.
99 * Note: we may be called with name == NULL on the first open only.
101 * -1 on failure, 0 otherwise
118 can_unlnk = did_io = io_ok = invld_rec = 0;
123 * open based on overall operation mode
131 } else if ((arfd = open(name, EXT_MODE, DMOD)) < 0)
132 syswarn(0, errno, "Failed open to read on %s", name);
138 arfd = STDOUT_FILENO;
140 } else if ((arfd = open(name, AR_MODE, DMOD)) < 0)
141 syswarn(0, errno, "Failed open to write on %s", name);
149 err(1, "can not filter through compressor while appending");
151 arfd = STDOUT_FILENO;
153 } else if ((arfd = open(name, APP_MODE, DMOD)) < 0)
154 syswarn(0, errno, "Failed open to read/write on %s",
159 * arfd not used in COPY mode
169 if (chdir(chdname) != 0)
170 syswarn(1, errno, "Failed chdir to %s", chdname);
172 * set up is based on device type
174 if (fstat(arfd, &arsb) < 0) {
175 syswarn(0, errno, "Failed stat on %s", arcname);
181 if (S_ISDIR(arsb.st_mode)) {
182 paxwarn(0, "Cannot write an archive on top of a directory %s",
190 if (S_ISCHR(arsb.st_mode))
191 artyp = ioctl(arfd, MTIOCGET, &mb) ? ISCHR : ISTAPE;
192 else if (S_ISBLK(arsb.st_mode))
194 else if ((lseek(arfd, (off_t)0L, SEEK_CUR) == -1) && (errno == ESPIPE))
200 * make sure we beyond any doubt that we only can unlink regular files
206 * if we are writing, we are done
208 if (act == ARCHIVE) {
209 blksz = rdblksz = wrblksz;
215 * set default blksz on read. APPNDs writes rdblksz on the last volume
216 * On all new archive volumes, we shift to wrblksz (if the user
217 * specified one, otherwize we will continue to use rdblksz). We
218 * must to set blocksize based on what kind of device the archive is
224 * Tape drives come in at least two flavors. Those that support
225 * variable sized records and those that have fixed sized
226 * records. They must be treated differently. For tape drives
227 * that support variable sized records, we must make large
228 * reads to make sure we get the entire record, otherwise we
229 * will just get the first part of the record (up to size we
230 * asked). Tapes with fixed sized records may or may not return
231 * multiple records in a single read. We really do not care
232 * what the physical record size is UNLESS we are going to
233 * append. (We will need the physical block size to rewrite
234 * the trailer). Only when we are appending do we go to the
235 * effort to figure out the true PHYSICAL record size.
237 blksz = rdblksz = MAXBLK;
243 * Blocksize is not a major issue with these devices (but must
244 * be kept a multiple of 512). If the user specified a write
245 * block size, we use that to read. Under append, we must
246 * always keep blksz == rdblksz. Otherwise we go ahead and use
247 * the device optimal blocksize as (and if) returned by stat
248 * and if it is within pax specs.
250 if ((act == APPND) && wrblksz) {
251 blksz = rdblksz = wrblksz;
255 if ((arsb.st_blksize > 0) && (arsb.st_blksize < MAXBLK) &&
256 ((arsb.st_blksize % BLKMULT) == 0))
257 rdblksz = arsb.st_blksize;
261 * For performance go for large reads when we can without harm
263 if ((act == APPND) || (artyp == ISCHR))
270 * if the user specified wrblksz works, use it. Under appends
271 * we must always keep blksz == rdblksz
273 if ((act == APPND) && wrblksz && ((arsb.st_size%wrblksz)==0)){
274 blksz = rdblksz = wrblksz;
278 * See if we can find the blocking factor from the file size
280 for (rdblksz = MAXBLK; rdblksz > 0; rdblksz -= BLKMULT)
281 if ((arsb.st_size % rdblksz) == 0)
284 * When we cannont find a match, we may have a flawed archive.
289 * for performance go for large reads when we can
298 * should never happen, worse case, slow...
300 blksz = rdblksz = BLKMULT;
309 * closes archive device, increments volume number, and prints i/o summary
321 did_io = io_ok = flcnt = 0;
326 * Close archive file. This may take a LONG while on tapes (we may be
327 * forced to wait for the rewind to complete) so tell the user what is
328 * going on (this avoids the user hitting control-c thinking pax is
331 if (vflag && (artyp == ISTAPE)) {
333 (void)putc('\n', listf);
335 "%s: Waiting for tape drive close to complete...",
341 * if nothing was written to the archive (and we created it), we remove
344 if (can_unlnk && (fstat(arfd, &arsb) == 0) && (S_ISREG(arsb.st_mode)) &&
345 (arsb.st_size == 0)) {
346 (void)unlink(arcname);
352 if (vflag && (artyp == ISTAPE)) {
353 (void)fputs("done.\n", listf);
359 if (!io_ok && !did_io) {
366 * The volume number is only increased when the last device has data
367 * and we have already determined the archive format.
378 * Print out a summary of I/O for this archive volume.
381 (void)putc('\n', listf);
386 * If we have not determined the format yet, we just say how many bytes
387 * we have skipped over looking for a header to id. there is no way we
388 * could have written anything yet.
392 (void)fprintf(listf, "%s: unknown format, %lu bytes skipped.\n",
394 (void)fprintf(listf, "%s: unknown format, %qu bytes skipped.\n",
402 if (strcmp(NM_CPIO, argv0) == 0)
403 (void)fprintf(listf, "%qu blocks\n", (rdcnt ? rdcnt : wrcnt) / 5120);
404 else if (strcmp(NM_TAR, argv0) != 0)
407 "%s: %s vol %d, %lu files, %lu bytes read, %lu bytes written.\n",
409 "%s: %s vol %d, %lu files, %qu bytes read, %qu bytes written.\n",
411 argv0, frmt->name, arvol-1, flcnt, rdcnt, wrcnt);
418 * drain any archive format independent padding from an archive read
419 * from a socket or a pipe. This is to prevent the process on the
420 * other side of the pipe from getting a SIGPIPE (pax will stop
421 * reading an archive once a format dependent trailer is detected).
435 * we only drain from a pipe/socket. Other devices can be closed
436 * without reading up to end of file. We sure hope that pipe is closed
437 * on the other side so we will get an EOF.
439 if ((artyp != ISPIPE) || (lstrval <= 0))
443 * keep reading until pipe is drained
445 while ((res = read(arfd, drbuf, sizeof(drbuf))) > 0)
452 * Set up device right before switching from read to write in an append.
453 * device dependent code (if required) to do this should be added here.
454 * For all archive devices we are already positioned at the place we want
455 * to start writing when this routine is called.
457 * 0 if all ready to write, -1 otherwise
471 * we must make sure the trailer is rewritten on append, ar_next()
472 * will stop us if the archive containing the trailer was not written
477 * Add any device dependent code as required here
482 * Ok we have an archive in a regular file. If we were rewriting a
483 * file, we must get rid of all the stuff after the current offset
484 * (it was not written by pax).
486 if (((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) ||
487 (ftruncate(arfd, cpos) < 0)) {
488 syswarn(1, errno, "Unable to truncate archive file");
496 * check if the last volume in the archive allows appends. We cannot check
497 * this until we are ready to write since there is no spec that says all
498 * volumes in a single archive have to be of the same type...
500 * 0 if we can append, -1 otherwise.
511 if (artyp == ISPIPE) {
512 paxwarn(1, "Cannot append to an archive obtained from a pipe.");
518 paxwarn(1,"Cannot append, device record size %d does not support %s spec",
525 * read up to a specified number of bytes from the archive into the
526 * supplied buffer. When dealing with tapes we may not always be able to
529 * Number of bytes in buffer. 0 for end of file, -1 for a read error.
534 ar_read(register char *buf, register int cnt)
542 register int res = 0;
545 * if last i/o was in error, no more reads until reset or new volume
551 * how we read must be based on device type
555 if ((res = read(arfd, buf, cnt)) > 0) {
557 * CAUTION: tape systems may not always return the same
558 * sized records so we leave blksz == MAXBLK. The
559 * physical record size that a tape drive supports is
560 * very hard to determine in a uniform and portable
564 if (res != rdblksz) {
566 * Record size changed. If this is happens on
567 * any record after the first, we probably have
568 * a tape drive which has a fixed record size
569 * we are getting multiple records in a single
570 * read). Watch out for record blocking that
571 * violates pax spec (must be a multiple of
575 if (rdblksz % BLKMULT)
587 * Files are so easy to deal with. These other things cannot
588 * be trusted at all. So when we are dealing with character
589 * devices and pipes we just take what they have ready for us
590 * and return. Trying to do anything else with them runs the
593 if ((res = read(arfd, buf, cnt)) > 0) {
601 * We are in trouble at this point, something is broken...
605 syswarn(1, errno, "Failed read on archive volume %d", arvol);
607 paxwarn(0, "End of archive volume %d reached", arvol);
613 * Write a specified number of bytes in supplied buffer to the archive
614 * device so it appears as a single "block". Deals with errors and tries
615 * to recover when faced with short writes.
617 * Number of bytes written. 0 indicates end of volume reached and with no
618 * flaws (as best that can be detected). A -1 indicates an unrecoverable
619 * error in the archive occured.
624 ar_write(register char *buf, register int bsz)
636 * do not allow pax to create a "bad" archive. Once a write fails on
637 * an archive volume prevent further writes to it.
642 if ((res = write(arfd, buf, bsz)) == bsz) {
648 * write broke, see what we can do with it. We try to send any partial
649 * writes that may violate pax spec to the next archive volume.
658 if ((res > 0) && (res % BLKMULT)) {
660 * try to fix up partial writes which are not BLKMULT
661 * in size by forcing the runt record to next archive
664 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
667 if (ftruncate(arfd, cpos) < 0)
675 * if file is out of space, handle it like a return of 0
677 if ((errno == ENOSPC) || (errno == EFBIG) || (errno == EDQUOT))
685 if (errno == EACCES) {
686 paxwarn(0, "Write failed, archive is write protected.");
691 * see if we reached the end of media, if so force a change to
694 if ((errno == ENOSPC) || (errno == EIO) || (errno == ENXIO))
700 * we cannot fix errors to these devices
706 * Better tell the user the bad news...
707 * if this is a block aligned archive format, we may have a bad archive
708 * if the format wants the header to start at a BLKMULT boundry. While
709 * we can deal with the mis-aligned data, it violates spec and other
710 * archive readers will likely fail. if the format is not block
711 * aligned, the user may be lucky (and the archive is ok).
720 * If we were trying to rewrite the trailer and it didn't work, we
721 * must quit right away.
723 if (!wr_trail && (res <= 0)) {
724 paxwarn(1,"Unable to append, trailer re-write failed. Quitting.");
729 paxwarn(0, "End of archive volume %d reached", arvol);
731 syswarn(1, errno, "Failed write to archive volume: %d", arvol);
732 else if (!frmt->blkalgn || ((res % frmt->blkalgn) == 0))
733 paxwarn(0,"WARNING: partial archive write. Archive MAY BE FLAWED");
735 paxwarn(1,"WARNING: partial archive write. Archive IS FLAWED");
741 * Try to move past a bad spot on a flawed archive as needed to continue
742 * I/O. Clears error flags to allow I/O to continue.
744 * 0 when ok to try i/o again, -1 otherwise.
761 * Fail resync attempts at user request (done) or this is going to be
762 * an update/append to a existing archive. if last i/o hit media end,
763 * we need to go to the next volume not try a resync
765 if ((done > 0) || (lstrval == 0))
768 if ((act == APPND) || (act == ARCHIVE)) {
769 paxwarn(1, "Cannot allow updates to an archive with flaws.");
778 * if the last i/o was a successful data transfer, we assume
779 * the fault is just a bad record on the tape that we are now
780 * past. If we did not get any data since the last resync try
781 * to move the tape foward one PHYSICAL record past any
782 * damaged tape section. Some tape drives are stubborn and need
792 if (ioctl(arfd, MTIOCTOP, &mb) < 0)
800 * try to step over the bad part of the device.
803 if (((fsbz = arsb.st_blksize) <= 0) || (artyp != ISREG))
805 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
807 mpos = fsbz - (cpos % (off_t)fsbz);
808 if (lseek(arfd, mpos, SEEK_CUR) < 0)
815 * cannot recover on these archive device types
821 paxwarn(1, "Unable to recover from an archive read failure.");
824 paxwarn(0, "Attempting to recover from an archive read failure.");
830 * Move the I/O position within the archive foward the specified number of
831 * bytes as supported by the device. If we cannot move the requested
832 * number of bytes, return the actual number of bytes moved in skipped.
834 * 0 if moved the requested distance, -1 on complete failure, 1 on
835 * partial move (the amount moved is in skipped)
840 ar_fow(off_t sksz, off_t *skipped)
843 ar_fow(sksz, skipped)
856 * we cannot move foward at EOF or error
862 * Safer to read forward on devices where it is hard to find the end of
863 * the media without reading to it. With tapes we cannot be sure of the
864 * number of physical blocks to skip (we do not know physical block
865 * size at this point), so we must only read foward on tapes!
871 * figure out where we are in the archive
873 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) >= 0) {
875 * we can be asked to move farther than there are bytes in this
876 * volume, if so, just go to file end and let normal buf_fill()
877 * deal with the end of file (it will go to next volume by
880 if ((mpos = cpos + sksz) > arsb.st_size) {
881 *skipped = arsb.st_size - cpos;
885 if (lseek(arfd, mpos, SEEK_SET) >= 0)
888 syswarn(1, errno, "Foward positioning operation on archive failed");
895 * move the i/o position within the archive backwards the specified byte
896 * count as supported by the device. With tapes drives we RESET rdblksz to
897 * the PHYSICAL blocksize.
898 * NOTE: We should only be called to move backwards so we can rewrite the
899 * last records (the trailer) of an archive (APPEND).
901 * 0 if moved the requested distance, -1 on complete failure
918 * make sure we do not have try to reverse on a flawed archive
928 * cannot go backwards on these critters
930 paxwarn(1, "Reverse positioning on pipes is not supported.");
941 * For things other than files, backwards movement has a very
942 * high probability of failure as we really do not know the
943 * true attributes of the device we are talking to (the device
944 * may not even have the ability to lseek() in any direction).
945 * First we figure out where we are in the archive.
947 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) {
949 "Unable to obtain current archive byte offset");
955 * we may try to go backwards past the start when the archive
956 * is only a single record. If this hapens and we are on a
957 * multi volume archive, we need to go to the end of the
958 * previous volume and continue our movement backwards from
961 if ((cpos -= sksz) < (off_t)0L) {
964 * this should never happen
966 paxwarn(1,"Reverse position on previous volume.");
972 if (lseek(arfd, cpos, SEEK_SET) < 0) {
973 syswarn(1, errno, "Unable to seek archive backwards");
980 * Calculate and move the proper number of PHYSICAL tape
981 * blocks. If the sksz is not an even multiple of the physical
982 * tape size, we cannot do the move (this should never happen).
983 * (We also cannot handler trailers spread over two vols).
984 * get_phys() also makes sure we are in front of the filemark.
986 if ((phyblk = get_phys()) <= 0) {
992 * make sure future tape reads only go by physical tape block
993 * size (set rdblksz to the real size).
998 * if no movement is required, just return (we must be after
999 * get_phys() so the physical blocksize is properly set)
1005 * ok we have to move. Make sure the tape drive can do it.
1007 if (sksz % phyblk) {
1009 "Tape drive unable to backspace requested amount");
1015 * move backwards the requested number of bytes
1018 mb.mt_count = sksz/phyblk;
1019 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1020 syswarn(1,errno, "Unable to backspace tape %d blocks.",
1033 * Determine the physical block size on a tape drive. We need the physical
1034 * block size so we know how many bytes we skip over when we move with
1035 * mtio commands. We also make sure we are BEFORE THE TAPE FILEMARK when
1037 * This is one really SLOW routine...
1039 * physical block size if ok (ok > 0), -1 otherwise
1050 register int padsz = 0;
1052 register int phyblk;
1057 * move to the file mark, and then back up one record and read it.
1058 * this should tell us the physical record size the tape is using.
1062 * we know we are at file mark when we get back a 0 from
1065 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1068 syswarn(1, errno, "Unable to locate tape filemark.");
1074 * move backwards over the file mark so we are at the end of the
1079 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1080 syswarn(1, errno, "Unable to backspace over tape filemark.");
1085 * move backwards so we are in front of the last record and read it to
1086 * get physical tape blocksize.
1090 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1091 syswarn(1, errno, "Unable to backspace over last tape block.");
1094 if ((phyblk = read(arfd, scbuf, sizeof(scbuf))) <= 0) {
1095 syswarn(1, errno, "Cannot determine archive tape blocksize.");
1100 * read foward to the file mark, then back up in front of the filemark
1101 * (this is a bit paranoid, but should be safe to do).
1103 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1106 syswarn(1, errno, "Unable to locate tape filemark.");
1111 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1112 syswarn(1, errno, "Unable to backspace over tape filemark.");
1117 * set lstrval so we know that the filemark has not been seen
1122 * return if there was no padding
1128 * make sure we can move backwards over the padding. (this should
1131 if (padsz % phyblk) {
1132 paxwarn(1, "Tape drive unable to backspace requested amount");
1137 * move backwards over the padding so the head is where it was when
1138 * we were first called (if required).
1141 mb.mt_count = padsz/phyblk;
1142 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1143 syswarn(1,errno,"Unable to backspace tape over %d pad blocks",
1152 * prompts the user for the next volume in this archive. For some devices
1153 * we may allow the media to be changed. Otherwise a new archive is
1154 * prompted for. By pax spec, if there is no controlling tty or an eof is
1155 * read on tty input, we must quit pax.
1157 * 0 when ready to continue, -1 when all done
1168 char buf[PAXPATHLEN+2];
1169 static int freeit = 0;
1173 * WE MUST CLOSE THE DEVICE. A lot of devices must see last close, (so
1174 * things like writing EOF etc will be done) (Watch out ar_close() can
1175 * also be called via a signal handler, so we must prevent a race.
1177 if (sigprocmask(SIG_BLOCK, &s_mask, &o_mask) < 0)
1178 syswarn(0, errno, "Unable to set signal mask");
1180 if (sigprocmask(SIG_SETMASK, &o_mask, NULL) < 0)
1181 syswarn(0, errno, "Unable to restore signal mask");
1183 if (done || !wr_trail || strcmp(NM_TAR, argv0) == 0)
1186 tty_prnt("\nATTENTION! %s archive volume change required.\n", argv0);
1189 * if i/o is on stdin or stdout, we cannot reopen it (we do not know
1190 * the name), the user will be forced to type it in.
1192 if (strcmp(arcname, STDO) && strcmp(arcname, STDN) && (artyp != ISREG)
1193 && (artyp != ISPIPE)) {
1194 if (artyp == ISTAPE) {
1195 tty_prnt("%s ready for archive tape volume: %d\n",
1197 tty_prnt("Load the NEXT TAPE on the tape drive");
1199 tty_prnt("%s ready for archive volume: %d\n",
1201 tty_prnt("Load the NEXT STORAGE MEDIA (if required)");
1204 if ((act == ARCHIVE) || (act == APPND))
1205 tty_prnt(" and make sure it is WRITE ENABLED.\n");
1210 tty_prnt("Type \"y\" to continue, \".\" to quit %s,",
1212 tty_prnt(" or \"s\" to switch to new device.\nIf you");
1213 tty_prnt(" cannot change storage media, type \"s\"\n");
1214 tty_prnt("Is the device ready and online? > ");
1216 if ((tty_read(buf,sizeof(buf))<0) || !strcmp(buf,".")){
1219 tty_prnt("Quitting %s!\n", argv0);
1224 if ((buf[0] == '\0') || (buf[1] != '\0')) {
1225 tty_prnt("%s unknown command, try again\n",buf);
1233 * we are to continue with the same device
1235 if (ar_open(arcname) >= 0)
1237 tty_prnt("Cannot re-open %s, try again\n",
1243 * user wants to open a different device
1245 tty_prnt("Switching to a different archive\n");
1248 tty_prnt("%s unknown command, try again\n",buf);
1254 tty_prnt("Ready for archive volume: %d\n", arvol);
1257 * have to go to a different archive
1260 tty_prnt("Input archive name or \".\" to quit %s.\n", argv0);
1261 tty_prnt("Archive name > ");
1263 if ((tty_read(buf, sizeof(buf)) < 0) || !strcmp(buf, ".")) {
1266 tty_prnt("Quitting %s!\n", argv0);
1270 if (buf[0] == '\0') {
1271 tty_prnt("Empty file name, try again\n");
1274 if (!strcmp(buf, "..")) {
1275 tty_prnt("Illegal file name: .. try again\n");
1278 if (strlen(buf) > PAXPATHLEN) {
1279 tty_prnt("File name too long, try again\n");
1284 * try to open new archive
1286 if (ar_open(buf) >= 0) {
1288 (void)free(arcname);
1291 if ((arcname = strdup(buf)) == NULL) {
1294 paxwarn(0, "Cannot save archive name.");
1300 tty_prnt("Cannot open %s, try again\n", buf);
1308 * starts the compress, gzip or bzip2 compression/decompression process
1309 * as a child, using magic to keep the fd the same in the calling function
1314 ar_start_gzip(int fd)
1325 err(1, "could not pipe");
1328 err(1, "could not fork");
1341 errx(1, "ar_start_gzip: impossible");
1348 dup2(fds[0], STDIN_FILENO);
1349 dup2(fd, STDOUT_FILENO);
1354 dup2(fds[1], STDOUT_FILENO);
1355 dup2(fd, STDIN_FILENO);
1359 errx(1, "ar_start_gzip: impossible");
1363 if (execlp(gzip_program, gzip_program, gzip_flags, NULL) < 0)
1364 err(1, "could not exec");