2 * Copyright (c) 1992 Keith Muller.
3 * Copyright (c) 1992, 1993
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
7 * Keith Muller of the University of California, San Diego.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 static char sccsid[] = "@(#)ar_io.c 8.2 (Berkeley) 4/18/94";
42 static const char rcsid[] =
43 "$FreeBSD: src/bin/pax/ar_io.c,v 1.12.2.1 2001/08/01 05:03:11 obrien Exp $";
46 #include <sys/types.h>
47 #include <sys/ioctl.h>
64 * Routines which deal directly with the archive I/O device/file.
67 #define DMOD 0666 /* default mode of created archives */
68 #define EXT_MODE O_RDONLY /* open mode for list/extract */
69 #define AR_MODE (O_WRONLY | O_CREAT | O_TRUNC) /* mode for archive */
70 #define APP_MODE O_RDWR /* mode for append */
71 #define STDO "<STDOUT>" /* pseudo name for stdout */
72 #define STDN "<STDIN>" /* pseudo name for stdin */
73 static int arfd = -1; /* archive file descriptor */
74 static int artyp = ISREG; /* archive type: file/FIFO/tape */
75 static int arvol = 1; /* archive volume number */
76 static int lstrval = -1; /* return value from last i/o */
77 static int io_ok; /* i/o worked on volume after resync */
78 static int did_io; /* did i/o ever occur on volume? */
79 static int done; /* set via tty termination */
80 static struct stat arsb; /* stat of archive device at open */
81 static int invld_rec; /* tape has out of spec record size */
82 static int wr_trail = 1; /* trailer was rewritten in append */
83 static int can_unlnk = 0; /* do we unlink null archives? */
84 char *arcname; /* printable name of archive */
85 const char *gzip_program; /* name of gzip program */
86 static pid_t zpid = -1; /* pid of child process */
88 static int get_phys __P((void));
89 extern sigset_t s_mask;
90 static void ar_start_gzip __P((int, const char *, int));
94 * Opens the next archive volume. Determines the type of the device and
95 * sets up block sizes as required by the archive device and the format.
96 * Note: we may be called with name == NULL on the first open only.
98 * -1 on failure, 0 otherwise
115 can_unlnk = did_io = io_ok = invld_rec = 0;
120 * open based on overall operation mode
128 } else if ((arfd = open(name, EXT_MODE, DMOD)) < 0)
129 syswarn(0, errno, "Failed open to read on %s", name);
130 if (arfd != -1 && gzip_program != NULL)
131 ar_start_gzip(arfd, gzip_program, 0);
135 arfd = STDOUT_FILENO;
137 } else if ((arfd = open(name, AR_MODE, DMOD)) < 0)
138 syswarn(0, errno, "Failed open to write on %s", name);
141 if (arfd != -1 && gzip_program != NULL)
142 ar_start_gzip(arfd, gzip_program, 1);
146 arfd = STDOUT_FILENO;
148 } else if ((arfd = open(name, APP_MODE, DMOD)) < 0)
149 syswarn(0, errno, "Failed open to read/write on %s",
154 * arfd not used in COPY mode
164 if (chdir(chdname) != 0)
165 syswarn(1, errno, "Failed chdir to %s", chdname);
167 * set up is based on device type
169 if (fstat(arfd, &arsb) < 0) {
170 syswarn(0, errno, "Failed stat on %s", arcname);
176 if (S_ISDIR(arsb.st_mode)) {
177 paxwarn(0, "Cannot write an archive on top of a directory %s",
185 if (S_ISCHR(arsb.st_mode))
186 artyp = ioctl(arfd, MTIOCGET, &mb) ? ISCHR : ISTAPE;
187 else if (S_ISBLK(arsb.st_mode))
189 else if ((lseek(arfd, (off_t)0L, SEEK_CUR) == -1) && (errno == ESPIPE))
195 * make sure we beyond any doubt that we only can unlink regular files
201 * if we are writing, we are done
203 if (act == ARCHIVE) {
204 blksz = rdblksz = wrblksz;
210 * set default blksz on read. APPNDs writes rdblksz on the last volume
211 * On all new archive volumes, we shift to wrblksz (if the user
212 * specified one, otherwize we will continue to use rdblksz). We
213 * must to set blocksize based on what kind of device the archive is
219 * Tape drives come in at least two flavors. Those that support
220 * variable sized records and those that have fixed sized
221 * records. They must be treated differently. For tape drives
222 * that support variable sized records, we must make large
223 * reads to make sure we get the entire record, otherwise we
224 * will just get the first part of the record (up to size we
225 * asked). Tapes with fixed sized records may or may not return
226 * multiple records in a single read. We really do not care
227 * what the physical record size is UNLESS we are going to
228 * append. (We will need the physical block size to rewrite
229 * the trailer). Only when we are appending do we go to the
230 * effort to figure out the true PHYSICAL record size.
232 blksz = rdblksz = MAXBLK;
238 * Blocksize is not a major issue with these devices (but must
239 * be kept a multiple of 512). If the user specified a write
240 * block size, we use that to read. Under append, we must
241 * always keep blksz == rdblksz. Otherwise we go ahead and use
242 * the device optimal blocksize as (and if) returned by stat
243 * and if it is within pax specs.
245 if ((act == APPND) && wrblksz) {
246 blksz = rdblksz = wrblksz;
250 if ((arsb.st_blksize > 0) && (arsb.st_blksize < MAXBLK) &&
251 ((arsb.st_blksize % BLKMULT) == 0))
252 rdblksz = arsb.st_blksize;
256 * For performance go for large reads when we can without harm
258 if ((act == APPND) || (artyp == ISCHR))
265 * if the user specified wrblksz works, use it. Under appends
266 * we must always keep blksz == rdblksz
268 if ((act == APPND) && wrblksz && ((arsb.st_size%wrblksz)==0)){
269 blksz = rdblksz = wrblksz;
273 * See if we can find the blocking factor from the file size
275 for (rdblksz = MAXBLK; rdblksz > 0; rdblksz -= BLKMULT)
276 if ((arsb.st_size % rdblksz) == 0)
279 * When we cannot find a match, we may have a flawed archive.
284 * for performance go for large reads when we can
293 * should never happen, worse case, slow...
295 blksz = rdblksz = BLKMULT;
304 * closes archive device, increments volume number, and prints i/o summary
316 did_io = io_ok = flcnt = 0;
321 * Close archive file. This may take a LONG while on tapes (we may be
322 * forced to wait for the rewind to complete) so tell the user what is
323 * going on (this avoids the user hitting control-c thinking pax is
326 if (vflag && (artyp == ISTAPE)) {
328 (void)putc('\n', listf);
330 "%s: Waiting for tape drive close to complete...",
336 * if nothing was written to the archive (and we created it), we remove
339 if (can_unlnk && (fstat(arfd, &arsb) == 0) && (S_ISREG(arsb.st_mode)) &&
340 (arsb.st_size == 0)) {
341 (void)unlink(arcname);
346 * for a quick extract/list, pax frequently exits before the child
349 if ((act == LIST || act == EXTRACT) && nflag && zpid > 0) {
352 waitpid(zpid, &status, 0);
357 if (vflag && (artyp == ISTAPE)) {
358 (void)fputs("done.\n", listf);
364 if (!io_ok && !did_io) {
371 * The volume number is only increased when the last device has data
372 * and we have already determined the archive format.
383 * Print out a summary of I/O for this archive volume.
386 (void)putc('\n', listf);
391 * If we have not determined the format yet, we just say how many bytes
392 * we have skipped over looking for a header to id. there is no way we
393 * could have written anything yet.
397 (void)fprintf(listf, "%s: unknown format, %lu bytes skipped.\n",
399 (void)fprintf(listf, "%s: unknown format, %qu bytes skipped.\n",
407 if (strcmp(NM_CPIO, argv0) == 0)
408 (void)fprintf(listf, "%qu blocks\n", (rdcnt ? rdcnt : wrcnt) / 5120);
409 else if (strcmp(NM_TAR, argv0) != 0)
412 "%s: %s vol %d, %lu files, %lu bytes read, %lu bytes written.\n",
414 "%s: %s vol %d, %lu files, %qu bytes read, %qu bytes written.\n",
416 argv0, frmt->name, arvol-1, flcnt, rdcnt, wrcnt);
423 * drain any archive format independent padding from an archive read
424 * from a socket or a pipe. This is to prevent the process on the
425 * other side of the pipe from getting a SIGPIPE (pax will stop
426 * reading an archive once a format dependent trailer is detected).
440 * we only drain from a pipe/socket. Other devices can be closed
441 * without reading up to end of file. We sure hope that pipe is closed
442 * on the other side so we will get an EOF.
444 if ((artyp != ISPIPE) || (lstrval <= 0))
448 * keep reading until pipe is drained
450 while ((res = read(arfd, drbuf, sizeof(drbuf))) > 0)
457 * Set up device right before switching from read to write in an append.
458 * device dependent code (if required) to do this should be added here.
459 * For all archive devices we are already positioned at the place we want
460 * to start writing when this routine is called.
462 * 0 if all ready to write, -1 otherwise
476 * we must make sure the trailer is rewritten on append, ar_next()
477 * will stop us if the archive containing the trailer was not written
482 * Add any device dependent code as required here
487 * Ok we have an archive in a regular file. If we were rewriting a
488 * file, we must get rid of all the stuff after the current offset
489 * (it was not written by pax).
491 if (((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) ||
492 (ftruncate(arfd, cpos) < 0)) {
493 syswarn(1, errno, "Unable to truncate archive file");
501 * check if the last volume in the archive allows appends. We cannot check
502 * this until we are ready to write since there is no spec that says all
503 * volumes in a single archive have to be of the same type...
505 * 0 if we can append, -1 otherwise.
516 if (artyp == ISPIPE) {
517 paxwarn(1, "Cannot append to an archive obtained from a pipe.");
523 paxwarn(1,"Cannot append, device record size %d does not support %s spec",
530 * read up to a specified number of bytes from the archive into the
531 * supplied buffer. When dealing with tapes we may not always be able to
534 * Number of bytes in buffer. 0 for end of file, -1 for a read error.
539 ar_read(register char *buf, register int cnt)
547 register int res = 0;
550 * if last i/o was in error, no more reads until reset or new volume
556 * how we read must be based on device type
560 if ((res = read(arfd, buf, cnt)) > 0) {
562 * CAUTION: tape systems may not always return the same
563 * sized records so we leave blksz == MAXBLK. The
564 * physical record size that a tape drive supports is
565 * very hard to determine in a uniform and portable
569 if (res != rdblksz) {
571 * Record size changed. If this is happens on
572 * any record after the first, we probably have
573 * a tape drive which has a fixed record size
574 * we are getting multiple records in a single
575 * read). Watch out for record blocking that
576 * violates pax spec (must be a multiple of
580 if (rdblksz % BLKMULT)
592 * Files are so easy to deal with. These other things cannot
593 * be trusted at all. So when we are dealing with character
594 * devices and pipes we just take what they have ready for us
595 * and return. Trying to do anything else with them runs the
598 if ((res = read(arfd, buf, cnt)) > 0) {
606 * We are in trouble at this point, something is broken...
610 syswarn(1, errno, "Failed read on archive volume %d", arvol);
612 paxwarn(0, "End of archive volume %d reached", arvol);
618 * Write a specified number of bytes in supplied buffer to the archive
619 * device so it appears as a single "block". Deals with errors and tries
620 * to recover when faced with short writes.
622 * Number of bytes written. 0 indicates end of volume reached and with no
623 * flaws (as best that can be detected). A -1 indicates an unrecoverable
624 * error in the archive occured.
629 ar_write(register char *buf, register int bsz)
641 * do not allow pax to create a "bad" archive. Once a write fails on
642 * an archive volume prevent further writes to it.
647 if ((res = write(arfd, buf, bsz)) == bsz) {
653 * write broke, see what we can do with it. We try to send any partial
654 * writes that may violate pax spec to the next archive volume.
663 if ((res > 0) && (res % BLKMULT)) {
665 * try to fix up partial writes which are not BLKMULT
666 * in size by forcing the runt record to next archive
669 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
672 if (ftruncate(arfd, cpos) < 0)
680 * if file is out of space, handle it like a return of 0
682 if ((errno == ENOSPC) || (errno == EFBIG) || (errno == EDQUOT))
690 if (errno == EACCES) {
691 paxwarn(0, "Write failed, archive is write protected.");
696 * see if we reached the end of media, if so force a change to
699 if ((errno == ENOSPC) || (errno == EIO) || (errno == ENXIO))
705 * we cannot fix errors to these devices
711 * Better tell the user the bad news...
712 * if this is a block aligned archive format, we may have a bad archive
713 * if the format wants the header to start at a BLKMULT boundary. While
714 * we can deal with the mis-aligned data, it violates spec and other
715 * archive readers will likely fail. if the format is not block
716 * aligned, the user may be lucky (and the archive is ok).
725 * If we were trying to rewrite the trailer and it didn't work, we
726 * must quit right away.
728 if (!wr_trail && (res <= 0)) {
729 paxwarn(1,"Unable to append, trailer re-write failed. Quitting.");
734 paxwarn(0, "End of archive volume %d reached", arvol);
736 syswarn(1, errno, "Failed write to archive volume: %d", arvol);
737 else if (!frmt->blkalgn || ((res % frmt->blkalgn) == 0))
738 paxwarn(0,"WARNING: partial archive write. Archive MAY BE FLAWED");
740 paxwarn(1,"WARNING: partial archive write. Archive IS FLAWED");
746 * Try to move past a bad spot on a flawed archive as needed to continue
747 * I/O. Clears error flags to allow I/O to continue.
749 * 0 when ok to try i/o again, -1 otherwise.
766 * Fail resync attempts at user request (done) or this is going to be
767 * an update/append to a existing archive. if last i/o hit media end,
768 * we need to go to the next volume not try a resync
770 if ((done > 0) || (lstrval == 0))
773 if ((act == APPND) || (act == ARCHIVE)) {
774 paxwarn(1, "Cannot allow updates to an archive with flaws.");
783 * if the last i/o was a successful data transfer, we assume
784 * the fault is just a bad record on the tape that we are now
785 * past. If we did not get any data since the last resync try
786 * to move the tape forward one PHYSICAL record past any
787 * damaged tape section. Some tape drives are stubborn and need
797 if (ioctl(arfd, MTIOCTOP, &mb) < 0)
805 * try to step over the bad part of the device.
808 if (((fsbz = arsb.st_blksize) <= 0) || (artyp != ISREG))
810 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
812 mpos = fsbz - (cpos % (off_t)fsbz);
813 if (lseek(arfd, mpos, SEEK_CUR) < 0)
820 * cannot recover on these archive device types
826 paxwarn(1, "Unable to recover from an archive read failure.");
829 paxwarn(0, "Attempting to recover from an archive read failure.");
835 * Move the I/O position within the archive foward the specified number of
836 * bytes as supported by the device. If we cannot move the requested
837 * number of bytes, return the actual number of bytes moved in skipped.
839 * 0 if moved the requested distance, -1 on complete failure, 1 on
840 * partial move (the amount moved is in skipped)
845 ar_fow(off_t sksz, off_t *skipped)
848 ar_fow(sksz, skipped)
861 * we cannot move foward at EOF or error
867 * Safer to read forward on devices where it is hard to find the end of
868 * the media without reading to it. With tapes we cannot be sure of the
869 * number of physical blocks to skip (we do not know physical block
870 * size at this point), so we must only read foward on tapes!
876 * figure out where we are in the archive
878 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) >= 0) {
880 * we can be asked to move farther than there are bytes in this
881 * volume, if so, just go to file end and let normal buf_fill()
882 * deal with the end of file (it will go to next volume by
885 if ((mpos = cpos + sksz) > arsb.st_size) {
886 *skipped = arsb.st_size - cpos;
890 if (lseek(arfd, mpos, SEEK_SET) >= 0)
893 syswarn(1, errno, "Forward positioning operation on archive failed");
900 * move the i/o position within the archive backwards the specified byte
901 * count as supported by the device. With tapes drives we RESET rdblksz to
902 * the PHYSICAL blocksize.
903 * NOTE: We should only be called to move backwards so we can rewrite the
904 * last records (the trailer) of an archive (APPEND).
906 * 0 if moved the requested distance, -1 on complete failure
923 * make sure we do not have try to reverse on a flawed archive
933 * cannot go backwards on these critters
935 paxwarn(1, "Reverse positioning on pipes is not supported.");
946 * For things other than files, backwards movement has a very
947 * high probability of failure as we really do not know the
948 * true attributes of the device we are talking to (the device
949 * may not even have the ability to lseek() in any direction).
950 * First we figure out where we are in the archive.
952 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) {
954 "Unable to obtain current archive byte offset");
960 * we may try to go backwards past the start when the archive
961 * is only a single record. If this hapens and we are on a
962 * multi volume archive, we need to go to the end of the
963 * previous volume and continue our movement backwards from
966 if ((cpos -= sksz) < (off_t)0L) {
969 * this should never happen
971 paxwarn(1,"Reverse position on previous volume.");
977 if (lseek(arfd, cpos, SEEK_SET) < 0) {
978 syswarn(1, errno, "Unable to seek archive backwards");
985 * Calculate and move the proper number of PHYSICAL tape
986 * blocks. If the sksz is not an even multiple of the physical
987 * tape size, we cannot do the move (this should never happen).
988 * (We also cannot handler trailers spread over two vols).
989 * get_phys() also makes sure we are in front of the filemark.
991 if ((phyblk = get_phys()) <= 0) {
997 * make sure future tape reads only go by physical tape block
998 * size (set rdblksz to the real size).
1003 * if no movement is required, just return (we must be after
1004 * get_phys() so the physical blocksize is properly set)
1010 * ok we have to move. Make sure the tape drive can do it.
1012 if (sksz % phyblk) {
1014 "Tape drive unable to backspace requested amount");
1020 * move backwards the requested number of bytes
1023 mb.mt_count = sksz/phyblk;
1024 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1025 syswarn(1,errno, "Unable to backspace tape %d blocks.",
1038 * Determine the physical block size on a tape drive. We need the physical
1039 * block size so we know how many bytes we skip over when we move with
1040 * mtio commands. We also make sure we are BEFORE THE TAPE FILEMARK when
1042 * This is one really SLOW routine...
1044 * physical block size if ok (ok > 0), -1 otherwise
1055 register int padsz = 0;
1057 register int phyblk;
1062 * move to the file mark, and then back up one record and read it.
1063 * this should tell us the physical record size the tape is using.
1067 * we know we are at file mark when we get back a 0 from
1070 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1073 syswarn(1, errno, "Unable to locate tape filemark.");
1079 * move backwards over the file mark so we are at the end of the
1084 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1085 syswarn(1, errno, "Unable to backspace over tape filemark.");
1090 * move backwards so we are in front of the last record and read it to
1091 * get physical tape blocksize.
1095 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1096 syswarn(1, errno, "Unable to backspace over last tape block.");
1099 if ((phyblk = read(arfd, scbuf, sizeof(scbuf))) <= 0) {
1100 syswarn(1, errno, "Cannot determine archive tape blocksize.");
1105 * read foward to the file mark, then back up in front of the filemark
1106 * (this is a bit paranoid, but should be safe to do).
1108 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1111 syswarn(1, errno, "Unable to locate tape filemark.");
1116 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1117 syswarn(1, errno, "Unable to backspace over tape filemark.");
1122 * set lstrval so we know that the filemark has not been seen
1127 * return if there was no padding
1133 * make sure we can move backwards over the padding. (this should
1136 if (padsz % phyblk) {
1137 paxwarn(1, "Tape drive unable to backspace requested amount");
1142 * move backwards over the padding so the head is where it was when
1143 * we were first called (if required).
1146 mb.mt_count = padsz/phyblk;
1147 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1148 syswarn(1,errno,"Unable to backspace tape over %d pad blocks",
1157 * prompts the user for the next volume in this archive. For some devices
1158 * we may allow the media to be changed. Otherwise a new archive is
1159 * prompted for. By pax spec, if there is no controlling tty or an eof is
1160 * read on tty input, we must quit pax.
1162 * 0 when ready to continue, -1 when all done
1173 char buf[PAXPATHLEN+2];
1174 static int freeit = 0;
1178 * WE MUST CLOSE THE DEVICE. A lot of devices must see last close, (so
1179 * things like writing EOF etc will be done) (Watch out ar_close() can
1180 * also be called via a signal handler, so we must prevent a race.
1182 if (sigprocmask(SIG_BLOCK, &s_mask, &o_mask) < 0)
1183 syswarn(0, errno, "Unable to set signal mask");
1185 if (sigprocmask(SIG_SETMASK, &o_mask, NULL) < 0)
1186 syswarn(0, errno, "Unable to restore signal mask");
1188 if (done || !wr_trail || strcmp(NM_TAR, argv0) == 0)
1191 tty_prnt("\nATTENTION! %s archive volume change required.\n", argv0);
1194 * if i/o is on stdin or stdout, we cannot reopen it (we do not know
1195 * the name), the user will be forced to type it in.
1197 if (strcmp(arcname, STDO) && strcmp(arcname, STDN) && (artyp != ISREG)
1198 && (artyp != ISPIPE)) {
1199 if (artyp == ISTAPE) {
1200 tty_prnt("%s ready for archive tape volume: %d\n",
1202 tty_prnt("Load the NEXT TAPE on the tape drive");
1204 tty_prnt("%s ready for archive volume: %d\n",
1206 tty_prnt("Load the NEXT STORAGE MEDIA (if required)");
1209 if ((act == ARCHIVE) || (act == APPND))
1210 tty_prnt(" and make sure it is WRITE ENABLED.\n");
1215 tty_prnt("Type \"y\" to continue, \".\" to quit %s,",
1217 tty_prnt(" or \"s\" to switch to new device.\nIf you");
1218 tty_prnt(" cannot change storage media, type \"s\"\n");
1219 tty_prnt("Is the device ready and online? > ");
1221 if ((tty_read(buf,sizeof(buf))<0) || !strcmp(buf,".")){
1224 tty_prnt("Quitting %s!\n", argv0);
1229 if ((buf[0] == '\0') || (buf[1] != '\0')) {
1230 tty_prnt("%s unknown command, try again\n",buf);
1238 * we are to continue with the same device
1240 if (ar_open(arcname) >= 0)
1242 tty_prnt("Cannot re-open %s, try again\n",
1248 * user wants to open a different device
1250 tty_prnt("Switching to a different archive\n");
1253 tty_prnt("%s unknown command, try again\n",buf);
1259 tty_prnt("Ready for archive volume: %d\n", arvol);
1262 * have to go to a different archive
1265 tty_prnt("Input archive name or \".\" to quit %s.\n", argv0);
1266 tty_prnt("Archive name > ");
1268 if ((tty_read(buf, sizeof(buf)) < 0) || !strcmp(buf, ".")) {
1271 tty_prnt("Quitting %s!\n", argv0);
1275 if (buf[0] == '\0') {
1276 tty_prnt("Empty file name, try again\n");
1279 if (!strcmp(buf, "..")) {
1280 tty_prnt("Illegal file name: .. try again\n");
1283 if (strlen(buf) > PAXPATHLEN) {
1284 tty_prnt("File name too long, try again\n");
1289 * try to open new archive
1291 if (ar_open(buf) >= 0) {
1293 (void)free(arcname);
1296 if ((arcname = strdup(buf)) == NULL) {
1299 paxwarn(0, "Cannot save archive name.");
1305 tty_prnt("Cannot open %s, try again\n", buf);
1313 * starts the gzip compression/decompression process as a child, using magic
1314 * to keep the fd the same in the calling function (parent).
1317 ar_start_gzip(int fd, const char *gzip_program, int wr)
1323 err(1, "could not pipe");
1326 err(1, "could not fork");
1338 dup2(fds[0], STDIN_FILENO);
1339 dup2(fd, STDOUT_FILENO);
1342 dup2(fds[1], STDOUT_FILENO);
1343 dup2(fd, STDIN_FILENO);
1348 if (execlp(gzip_program, gzip_program, gzip_flags,
1350 err(1, "could not exec");