2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1992 Keith Muller.
5 * Copyright (c) 1992, 1993
6 * The Regents of the University of California. All rights reserved.
8 * This code is derived from software contributed to Berkeley by
9 * Keith Muller of the University of California, San Diego.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include <sys/types.h>
37 #include <sys/ioctl.h>
55 * Routines which deal directly with the archive I/O device/file.
58 #define DMOD 0666 /* default mode of created archives */
59 #define EXT_MODE O_RDONLY /* open mode for list/extract */
60 #define AR_MODE (O_WRONLY | O_CREAT | O_TRUNC) /* mode for archive */
61 #define APP_MODE O_RDWR /* mode for append */
63 static char none[] = "<NONE>"; /* pseudo name for no file */
64 static char stdo[] = "<STDOUT>"; /* pseudo name for stdout */
65 static char stdn[] = "<STDIN>"; /* pseudo name for stdin */
66 static int arfd = -1; /* archive file descriptor */
67 static int artyp = ISREG; /* archive type: file/FIFO/tape */
68 static int arvol = 1; /* archive volume number */
69 static int lstrval = -1; /* return value from last i/o */
70 static int io_ok; /* i/o worked on volume after resync */
71 static int did_io; /* did i/o ever occur on volume? */
72 static int done; /* set via tty termination */
73 static struct stat arsb; /* stat of archive device at open */
74 static int invld_rec; /* tape has out of spec record size */
75 static int wr_trail = 1; /* trailer was rewritten in append */
76 static int can_unlnk = 0; /* do we unlink null archives? */
77 const char *arcname; /* printable name of archive */
78 const char *gzip_program; /* name of gzip program */
79 static pid_t zpid = -1; /* pid of child process */
81 static int get_phys(void);
82 static void ar_start_gzip(int, const char *, int);
86 * Opens the next archive volume. Determines the type of the device and
87 * sets up block sizes as required by the archive device and the format.
88 * Note: we may be called with name == NULL on the first open only.
90 * -1 on failure, 0 otherwise
94 ar_open(const char *name)
101 can_unlnk = did_io = io_ok = invld_rec = 0;
106 * open based on overall operation mode
114 } else if ((arfd = open(name, EXT_MODE, DMOD)) < 0)
115 syswarn(0, errno, "Failed open to read on %s", name);
116 if (arfd != -1 && gzip_program != NULL)
117 ar_start_gzip(arfd, gzip_program, 0);
121 arfd = STDOUT_FILENO;
123 } else if ((arfd = open(name, AR_MODE, DMOD)) < 0)
124 syswarn(0, errno, "Failed open to write on %s", name);
127 if (arfd != -1 && gzip_program != NULL)
128 ar_start_gzip(arfd, gzip_program, 1);
132 arfd = STDOUT_FILENO;
134 } else if ((arfd = open(name, APP_MODE, DMOD)) < 0)
135 syswarn(0, errno, "Failed open to read/write on %s",
140 * arfd not used in COPY mode
150 if (chdir(chdname) != 0) {
151 syswarn(1, errno, "Failed chdir to %s", chdname);
155 * set up is based on device type
157 if (fstat(arfd, &arsb) < 0) {
158 syswarn(0, errno, "Failed stat on %s", arcname);
164 if (S_ISDIR(arsb.st_mode)) {
165 paxwarn(0, "Cannot write an archive on top of a directory %s",
173 if (S_ISCHR(arsb.st_mode))
174 artyp = ioctl(arfd, MTIOCGET, &mb) ? ISCHR : ISTAPE;
175 else if (S_ISBLK(arsb.st_mode))
177 else if ((lseek(arfd, (off_t)0L, SEEK_CUR) == -1) && (errno == ESPIPE))
183 * make sure we beyond any doubt that we only can unlink regular files
189 * if we are writing, we are done
191 if (act == ARCHIVE) {
192 blksz = rdblksz = wrblksz;
198 * set default blksz on read. APPNDs writes rdblksz on the last volume
199 * On all new archive volumes, we shift to wrblksz (if the user
200 * specified one, otherwise we will continue to use rdblksz). We
201 * must set blocksize based on what kind of device the archive is
207 * Tape drives come in at least two flavors. Those that support
208 * variable sized records and those that have fixed sized
209 * records. They must be treated differently. For tape drives
210 * that support variable sized records, we must make large
211 * reads to make sure we get the entire record, otherwise we
212 * will just get the first part of the record (up to size we
213 * asked). Tapes with fixed sized records may or may not return
214 * multiple records in a single read. We really do not care
215 * what the physical record size is UNLESS we are going to
216 * append. (We will need the physical block size to rewrite
217 * the trailer). Only when we are appending do we go to the
218 * effort to figure out the true PHYSICAL record size.
220 blksz = rdblksz = MAXBLK;
226 * Blocksize is not a major issue with these devices (but must
227 * be kept a multiple of 512). If the user specified a write
228 * block size, we use that to read. Under append, we must
229 * always keep blksz == rdblksz. Otherwise we go ahead and use
230 * the device optimal blocksize as (and if) returned by stat
231 * and if it is within pax specs.
233 if ((act == APPND) && wrblksz) {
234 blksz = rdblksz = wrblksz;
238 if ((arsb.st_blksize > 0) && (arsb.st_blksize < MAXBLK) &&
239 ((arsb.st_blksize % BLKMULT) == 0))
240 rdblksz = arsb.st_blksize;
244 * For performance go for large reads when we can without harm
246 if ((act == APPND) || (artyp == ISCHR))
253 * if the user specified wrblksz works, use it. Under appends
254 * we must always keep blksz == rdblksz
256 if ((act == APPND) && wrblksz && ((arsb.st_size%wrblksz)==0)){
257 blksz = rdblksz = wrblksz;
261 * See if we can find the blocking factor from the file size
263 for (rdblksz = MAXBLK; rdblksz > 0; rdblksz -= BLKMULT)
264 if ((arsb.st_size % rdblksz) == 0)
267 * When we cannot find a match, we may have a flawed archive.
272 * for performance go for large reads when we can
281 * should never happen, worst case, slow...
283 blksz = rdblksz = BLKMULT;
292 * closes archive device, increments volume number, and prints i/o summary
300 did_io = io_ok = flcnt = 0;
305 * Close archive file. This may take a LONG while on tapes (we may be
306 * forced to wait for the rewind to complete) so tell the user what is
307 * going on (this avoids the user hitting control-c thinking pax is
310 if (vflag && (artyp == ISTAPE)) {
312 (void)putc('\n', listf);
314 "%s: Waiting for tape drive close to complete...",
320 * if nothing was written to the archive (and we created it), we remove
323 if (can_unlnk && (fstat(arfd, &arsb) == 0) && (S_ISREG(arsb.st_mode)) &&
324 (arsb.st_size == 0)) {
325 (void)unlink(arcname);
330 * for a quick extract/list, pax frequently exits before the child
333 if ((act == LIST || act == EXTRACT) && nflag && zpid > 0)
338 /* Do not exit before child to ensure data integrity */
340 waitpid(zpid, &status, 0);
342 if (vflag && (artyp == ISTAPE)) {
343 (void)fputs("done.\n", listf);
349 if (!io_ok && !did_io) {
356 * The volume number is only increased when the last device has data
357 * and we have already determined the archive format.
368 * Print out a summary of I/O for this archive volume.
371 (void)putc('\n', listf);
376 * If we have not determined the format yet, we just say how many bytes
377 * we have skipped over looking for a header to id. There is no way we
378 * could have written anything yet.
381 (void)fprintf(listf, "%s: unknown format, %ju bytes skipped.\n",
382 argv0, (uintmax_t)rdcnt);
388 if (strcmp(NM_CPIO, argv0) == 0)
389 (void)fprintf(listf, "%llu blocks\n",
390 (unsigned long long)((rdcnt ? rdcnt : wrcnt) / 5120));
391 else if (strcmp(NM_TAR, argv0) != 0)
393 "%s: %s vol %d, %ju files, %ju bytes read, %ju bytes written.\n",
394 argv0, frmt->name, arvol-1, (uintmax_t)flcnt,
395 (uintmax_t)rdcnt, (uintmax_t)wrcnt);
402 * drain any archive format independent padding from an archive read
403 * from a socket or a pipe. This is to prevent the process on the
404 * other side of the pipe from getting a SIGPIPE (pax will stop
405 * reading an archive once a format dependent trailer is detected).
414 * we only drain from a pipe/socket. Other devices can be closed
415 * without reading up to end of file. We sure hope that pipe is closed
416 * on the other side so we will get an EOF.
418 if ((artyp != ISPIPE) || (lstrval <= 0))
422 * keep reading until pipe is drained
424 while ((res = read(arfd, drbuf, sizeof(drbuf))) > 0)
431 * Set up device right before switching from read to write in an append.
432 * device dependent code (if required) to do this should be added here.
433 * For all archive devices we are already positioned at the place we want
434 * to start writing when this routine is called.
436 * 0 if all ready to write, -1 otherwise
445 * we must make sure the trailer is rewritten on append, ar_next()
446 * will stop us if the archive containing the trailer was not written
451 * Add any device dependent code as required here
456 * Ok we have an archive in a regular file. If we were rewriting a
457 * file, we must get rid of all the stuff after the current offset
458 * (it was not written by pax).
460 if (((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) ||
461 (ftruncate(arfd, cpos) < 0)) {
462 syswarn(1, errno, "Unable to truncate archive file");
470 * check if the last volume in the archive allows appends. We cannot check
471 * this until we are ready to write since there is no spec that says all
472 * volumes in a single archive have to be of the same type...
474 * 0 if we can append, -1 otherwise.
480 if (artyp == ISPIPE) {
481 paxwarn(1, "Cannot append to an archive obtained from a pipe.");
487 paxwarn(1,"Cannot append, device record size %d does not support %s spec",
494 * read up to a specified number of bytes from the archive into the
495 * supplied buffer. When dealing with tapes we may not always be able to
498 * Number of bytes in buffer. 0 for end of file, -1 for a read error.
502 ar_read(char *buf, int cnt)
507 * if last i/o was in error, no more reads until reset or new volume
513 * how we read must be based on device type
517 if ((res = read(arfd, buf, cnt)) > 0) {
519 * CAUTION: tape systems may not always return the same
520 * sized records so we leave blksz == MAXBLK. The
521 * physical record size that a tape drive supports is
522 * very hard to determine in a uniform and portable
526 if (res != rdblksz) {
528 * Record size changed. If this happens on
529 * any record after the first, we probably have
530 * a tape drive which has a fixed record size
531 * (we are getting multiple records in a single
532 * read). Watch out for record blocking that
533 * violates pax spec (must be a multiple of
537 if (rdblksz % BLKMULT)
549 * Files are so easy to deal with. These other things cannot
550 * be trusted at all. So when we are dealing with character
551 * devices and pipes we just take what they have ready for us
552 * and return. Trying to do anything else with them runs the
555 if ((res = read(arfd, buf, cnt)) > 0) {
563 * We are in trouble at this point, something is broken...
567 syswarn(1, errno, "Failed read on archive volume %d", arvol);
569 paxwarn(0, "End of archive volume %d reached", arvol);
575 * Write a specified number of bytes in supplied buffer to the archive
576 * device so it appears as a single "block". Deals with errors and tries
577 * to recover when faced with short writes.
579 * Number of bytes written. 0 indicates end of volume reached and with no
580 * flaws (as best that can be detected). A -1 indicates an unrecoverable
581 * error in the archive occurred.
585 ar_write(char *buf, int bsz)
591 * do not allow pax to create a "bad" archive. Once a write fails on
592 * an archive volume prevent further writes to it.
597 if ((res = write(arfd, buf, bsz)) == bsz) {
603 * write broke, see what we can do with it. We try to send any partial
604 * writes that may violate pax spec to the next archive volume.
613 if ((res > 0) && (res % BLKMULT)) {
615 * try to fix up partial writes which are not BLKMULT
616 * in size by forcing the runt record to next archive
619 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
622 if (ftruncate(arfd, cpos) < 0)
630 * if file is out of space, handle it like a return of 0
632 if ((errno == ENOSPC) || (errno == EFBIG) || (errno == EDQUOT))
640 if (errno == EACCES) {
641 paxwarn(0, "Write failed, archive is write protected.");
646 * see if we reached the end of media, if so force a change to
649 if ((errno == ENOSPC) || (errno == EIO) || (errno == ENXIO))
655 * we cannot fix errors to these devices
661 * Better tell the user the bad news...
662 * if this is a block aligned archive format, we may have a bad archive
663 * if the format wants the header to start at a BLKMULT boundary. While
664 * we can deal with the mis-aligned data, it violates spec and other
665 * archive readers will likely fail. If the format is not block
666 * aligned, the user may be lucky (and the archive is ok).
675 * If we were trying to rewrite the trailer and it didn't work, we
676 * must quit right away.
678 if (!wr_trail && (res <= 0)) {
679 paxwarn(1,"Unable to append, trailer re-write failed. Quitting.");
684 paxwarn(0, "End of archive volume %d reached", arvol);
686 syswarn(1, errno, "Failed write to archive volume: %d", arvol);
687 else if (!frmt->blkalgn || ((res % frmt->blkalgn) == 0))
688 paxwarn(0,"WARNING: partial archive write. Archive MAY BE FLAWED");
690 paxwarn(1,"WARNING: partial archive write. Archive IS FLAWED");
696 * Try to move past a bad spot on a flawed archive as needed to continue
697 * I/O. Clears error flags to allow I/O to continue.
699 * 0 when ok to try i/o again, -1 otherwise.
711 * Fail resync attempts at user request (done) or if this is going to be
712 * an update/append to an existing archive. If last i/o hit media end,
713 * we need to go to the next volume not try a resync.
715 if ((done > 0) || (lstrval == 0))
718 if ((act == APPND) || (act == ARCHIVE)) {
719 paxwarn(1, "Cannot allow updates to an archive with flaws.");
728 * if the last i/o was a successful data transfer, we assume
729 * the fault is just a bad record on the tape that we are now
730 * past. If we did not get any data since the last resync try
731 * to move the tape forward one PHYSICAL record past any
732 * damaged tape section. Some tape drives are stubborn and need
742 if (ioctl(arfd, MTIOCTOP, &mb) < 0)
750 * try to step over the bad part of the device.
753 if (((fsbz = arsb.st_blksize) <= 0) || (artyp != ISREG))
755 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
757 mpos = fsbz - (cpos % (off_t)fsbz);
758 if (lseek(arfd, mpos, SEEK_CUR) < 0)
765 * cannot recover on these archive device types
771 paxwarn(1, "Unable to recover from an archive read failure.");
774 paxwarn(0, "Attempting to recover from an archive read failure.");
780 * Move the I/O position within the archive forward the specified number of
781 * bytes as supported by the device. If we cannot move the requested
782 * number of bytes, return the actual number of bytes moved in skipped.
784 * 0 if moved the requested distance, -1 on complete failure, 1 on
785 * partial move (the amount moved is in skipped)
789 ar_fow(off_t sksz, off_t *skipped)
799 * we cannot move forward at EOF or error
805 * Safer to read forward on devices where it is hard to find the end of
806 * the media without reading to it. With tapes we cannot be sure of the
807 * number of physical blocks to skip (we do not know physical block
808 * size at this point), so we must only read forward on tapes!
814 * figure out where we are in the archive
816 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) >= 0) {
818 * we can be asked to move farther than there are bytes in this
819 * volume, if so, just go to file end and let normal buf_fill()
820 * deal with the end of file (it will go to next volume by
823 if ((mpos = cpos + sksz) > arsb.st_size) {
824 *skipped = arsb.st_size - cpos;
828 if (lseek(arfd, mpos, SEEK_SET) >= 0)
831 syswarn(1, errno, "Forward positioning operation on archive failed");
838 * move the i/o position within the archive backwards the specified byte
839 * count as supported by the device. With tapes drives we RESET rdblksz to
840 * the PHYSICAL blocksize.
841 * NOTE: We should only be called to move backwards so we can rewrite the
842 * last records (the trailer) of an archive (APPEND).
844 * 0 if moved the requested distance, -1 on complete failure
855 * make sure we do not have try to reverse on a flawed archive
865 * cannot go backwards on these critters
867 paxwarn(1, "Reverse positioning on pipes is not supported.");
878 * For things other than files, backwards movement has a very
879 * high probability of failure as we really do not know the
880 * true attributes of the device we are talking to (the device
881 * may not even have the ability to lseek() in any direction).
882 * First we figure out where we are in the archive.
884 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) {
886 "Unable to obtain current archive byte offset");
892 * we may try to go backwards past the start when the archive
893 * is only a single record. If this happens and we are on a
894 * multi volume archive, we need to go to the end of the
895 * previous volume and continue our movement backwards from
898 if ((cpos -= sksz) < (off_t)0L) {
901 * this should never happen
903 paxwarn(1,"Reverse position on previous volume.");
909 if (lseek(arfd, cpos, SEEK_SET) < 0) {
910 syswarn(1, errno, "Unable to seek archive backwards");
917 * Calculate and move the proper number of PHYSICAL tape
918 * blocks. If the sksz is not an even multiple of the physical
919 * tape size, we cannot do the move (this should never happen).
920 * (We also cannot handle trailers spread over two vols).
921 * get_phys() also makes sure we are in front of the filemark.
923 if ((phyblk = get_phys()) <= 0) {
929 * make sure future tape reads only go by physical tape block
930 * size (set rdblksz to the real size).
935 * if no movement is required, just return (we must be after
936 * get_phys() so the physical blocksize is properly set)
942 * ok we have to move. Make sure the tape drive can do it.
946 "Tape drive unable to backspace requested amount");
952 * move backwards the requested number of bytes
955 mb.mt_count = sksz/phyblk;
956 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
957 syswarn(1,errno, "Unable to backspace tape %d blocks.",
970 * Determine the physical block size on a tape drive. We need the physical
971 * block size so we know how many bytes we skip over when we move with
972 * mtio commands. We also make sure we are BEFORE THE TAPE FILEMARK when
974 * This is one really SLOW routine...
976 * physical block size if ok (ok > 0), -1 otherwise
989 * move to the file mark, and then back up one record and read it.
990 * this should tell us the physical record size the tape is using.
994 * we know we are at file mark when we get back a 0 from
997 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1000 syswarn(1, errno, "Unable to locate tape filemark.");
1006 * move backwards over the file mark so we are at the end of the
1011 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1012 syswarn(1, errno, "Unable to backspace over tape filemark.");
1017 * move backwards so we are in front of the last record and read it to
1018 * get physical tape blocksize.
1022 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1023 syswarn(1, errno, "Unable to backspace over last tape block.");
1026 if ((phyblk = read(arfd, scbuf, sizeof(scbuf))) <= 0) {
1027 syswarn(1, errno, "Cannot determine archive tape blocksize.");
1032 * read forward to the file mark, then back up in front of the filemark
1033 * (this is a bit paranoid, but should be safe to do).
1035 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1038 syswarn(1, errno, "Unable to locate tape filemark.");
1043 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1044 syswarn(1, errno, "Unable to backspace over tape filemark.");
1049 * set lstrval so we know that the filemark has not been seen
1054 * return if there was no padding
1060 * make sure we can move backwards over the padding. (this should
1063 if (padsz % phyblk) {
1064 paxwarn(1, "Tape drive unable to backspace requested amount");
1069 * move backwards over the padding so the head is where it was when
1070 * we were first called (if required).
1073 mb.mt_count = padsz/phyblk;
1074 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1075 syswarn(1,errno,"Unable to backspace tape over %d pad blocks",
1084 * prompts the user for the next volume in this archive. For some devices
1085 * we may allow the media to be changed. Otherwise a new archive is
1086 * prompted for. By pax spec, if there is no controlling tty or an eof is
1087 * read on tty input, we must quit pax.
1089 * 0 when ready to continue, -1 when all done
1095 static char *arcbuf;
1096 char buf[PAXPATHLEN+2];
1100 * WE MUST CLOSE THE DEVICE. A lot of devices must see last close, (so
1101 * things like writing EOF etc will be done) (Watch out ar_close() can
1102 * also be called via a signal handler, so we must prevent a race.
1104 if (sigprocmask(SIG_BLOCK, &s_mask, &o_mask) < 0)
1105 syswarn(0, errno, "Unable to set signal mask");
1107 if (sigprocmask(SIG_SETMASK, &o_mask, NULL) < 0)
1108 syswarn(0, errno, "Unable to restore signal mask");
1110 if (done || !wr_trail || Oflag || strcmp(NM_TAR, argv0) == 0)
1113 tty_prnt("\nATTENTION! %s archive volume change required.\n", argv0);
1116 * if i/o is on stdin or stdout, we cannot reopen it (we do not know
1117 * the name), the user will be forced to type it in.
1119 if (strcmp(arcname, stdo) && strcmp(arcname, stdn) && (artyp != ISREG)
1120 && (artyp != ISPIPE)) {
1121 if (artyp == ISTAPE) {
1122 tty_prnt("%s ready for archive tape volume: %d\n",
1124 tty_prnt("Load the NEXT TAPE on the tape drive");
1126 tty_prnt("%s ready for archive volume: %d\n",
1128 tty_prnt("Load the NEXT STORAGE MEDIA (if required)");
1131 if ((act == ARCHIVE) || (act == APPND))
1132 tty_prnt(" and make sure it is WRITE ENABLED.\n");
1137 tty_prnt("Type \"y\" to continue, \".\" to quit %s,",
1139 tty_prnt(" or \"s\" to switch to new device.\nIf you");
1140 tty_prnt(" cannot change storage media, type \"s\"\n");
1141 tty_prnt("Is the device ready and online? > ");
1143 if ((tty_read(buf,sizeof(buf))<0) || !strcmp(buf,".")){
1146 tty_prnt("Quitting %s!\n", argv0);
1151 if ((buf[0] == '\0') || (buf[1] != '\0')) {
1152 tty_prnt("%s unknown command, try again\n",buf);
1160 * we are to continue with the same device
1162 if (ar_open(arcname) >= 0)
1164 tty_prnt("Cannot re-open %s, try again\n",
1170 * user wants to open a different device
1172 tty_prnt("Switching to a different archive\n");
1175 tty_prnt("%s unknown command, try again\n",buf);
1181 tty_prnt("Ready for archive volume: %d\n", arvol);
1184 * have to go to a different archive
1187 tty_prnt("Input archive name or \".\" to quit %s.\n", argv0);
1188 tty_prnt("Archive name > ");
1190 if ((tty_read(buf, sizeof(buf)) < 0) || !strcmp(buf, ".")) {
1193 tty_prnt("Quitting %s!\n", argv0);
1197 if (buf[0] == '\0') {
1198 tty_prnt("Empty file name, try again\n");
1201 if (!strcmp(buf, "..")) {
1202 tty_prnt("Illegal file name: .. try again\n");
1205 if (strlen(buf) > PAXPATHLEN) {
1206 tty_prnt("File name too long, try again\n");
1211 * try to open new archive
1213 if (ar_open(buf) >= 0) {
1215 if ((arcbuf = strdup(buf)) == NULL) {
1218 paxwarn(0, "Cannot save archive name.");
1224 tty_prnt("Cannot open %s, try again\n", buf);
1232 * starts the gzip compression/decompression process as a child, using magic
1233 * to keep the fd the same in the calling function (parent).
1236 ar_start_gzip(int fd, const char *gzip_prog, int wr)
1239 const char *gzip_flags;
1242 err(1, "could not pipe");
1245 err(1, "could not fork");
1257 dup2(fds[0], STDIN_FILENO);
1258 dup2(fd, STDOUT_FILENO);
1261 dup2(fds[1], STDOUT_FILENO);
1262 dup2(fd, STDIN_FILENO);
1267 if (execlp(gzip_prog, gzip_prog, gzip_flags,
1269 err(1, "could not exec");