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 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 static char sccsid[] = "@(#)ar_io.c 8.2 (Berkeley) 4/18/94";
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include <sys/types.h>
43 #include <sys/ioctl.h>
61 * Routines which deal directly with the archive I/O device/file.
64 #define DMOD 0666 /* default mode of created archives */
65 #define EXT_MODE O_RDONLY /* open mode for list/extract */
66 #define AR_MODE (O_WRONLY | O_CREAT | O_TRUNC) /* mode for archive */
67 #define APP_MODE O_RDWR /* mode for append */
69 static char none[] = "<NONE>"; /* pseudo name for no file */
70 static char stdo[] = "<STDOUT>"; /* pseudo name for stdout */
71 static char stdn[] = "<STDIN>"; /* pseudo name for stdin */
72 static int arfd = -1; /* archive file descriptor */
73 static int artyp = ISREG; /* archive type: file/FIFO/tape */
74 static int arvol = 1; /* archive volume number */
75 static int lstrval = -1; /* return value from last i/o */
76 static int io_ok; /* i/o worked on volume after resync */
77 static int did_io; /* did i/o ever occur on volume? */
78 static int done; /* set via tty termination */
79 static struct stat arsb; /* stat of archive device at open */
80 static int invld_rec; /* tape has out of spec record size */
81 static int wr_trail = 1; /* trailer was rewritten in append */
82 static int can_unlnk = 0; /* do we unlink null archives? */
83 const char *arcname; /* printable name of archive */
84 const char *gzip_program; /* name of gzip program */
85 static pid_t zpid = -1; /* pid of child process */
87 static int get_phys(void);
88 static void ar_start_gzip(int, const char *, int);
92 * Opens the next archive volume. Determines the type of the device and
93 * sets up block sizes as required by the archive device and the format.
94 * Note: we may be called with name == NULL on the first open only.
96 * -1 on failure, 0 otherwise
100 ar_open(const char *name)
107 can_unlnk = did_io = io_ok = invld_rec = 0;
112 * open based on overall operation mode
120 } else if ((arfd = open(name, EXT_MODE, DMOD)) < 0)
121 syswarn(0, errno, "Failed open to read on %s", name);
122 if (arfd != -1 && gzip_program != NULL)
123 ar_start_gzip(arfd, gzip_program, 0);
127 arfd = STDOUT_FILENO;
129 } else if ((arfd = open(name, AR_MODE, DMOD)) < 0)
130 syswarn(0, errno, "Failed open to write on %s", name);
133 if (arfd != -1 && gzip_program != NULL)
134 ar_start_gzip(arfd, gzip_program, 1);
138 arfd = STDOUT_FILENO;
140 } else if ((arfd = open(name, APP_MODE, DMOD)) < 0)
141 syswarn(0, errno, "Failed open to read/write on %s",
146 * arfd not used in COPY mode
156 if (chdir(chdname) != 0) {
157 syswarn(1, errno, "Failed chdir to %s", chdname);
161 * set up is based on device type
163 if (fstat(arfd, &arsb) < 0) {
164 syswarn(0, errno, "Failed stat on %s", arcname);
170 if (S_ISDIR(arsb.st_mode)) {
171 paxwarn(0, "Cannot write an archive on top of a directory %s",
179 if (S_ISCHR(arsb.st_mode))
180 artyp = ioctl(arfd, MTIOCGET, &mb) ? ISCHR : ISTAPE;
181 else if (S_ISBLK(arsb.st_mode))
183 else if ((lseek(arfd, (off_t)0L, SEEK_CUR) == -1) && (errno == ESPIPE))
189 * make sure we beyond any doubt that we only can unlink regular files
195 * if we are writing, we are done
197 if (act == ARCHIVE) {
198 blksz = rdblksz = wrblksz;
204 * set default blksz on read. APPNDs writes rdblksz on the last volume
205 * On all new archive volumes, we shift to wrblksz (if the user
206 * specified one, otherwise we will continue to use rdblksz). We
207 * must to set blocksize based on what kind of device the archive is
213 * Tape drives come in at least two flavors. Those that support
214 * variable sized records and those that have fixed sized
215 * records. They must be treated differently. For tape drives
216 * that support variable sized records, we must make large
217 * reads to make sure we get the entire record, otherwise we
218 * will just get the first part of the record (up to size we
219 * asked). Tapes with fixed sized records may or may not return
220 * multiple records in a single read. We really do not care
221 * what the physical record size is UNLESS we are going to
222 * append. (We will need the physical block size to rewrite
223 * the trailer). Only when we are appending do we go to the
224 * effort to figure out the true PHYSICAL record size.
226 blksz = rdblksz = MAXBLK;
232 * Blocksize is not a major issue with these devices (but must
233 * be kept a multiple of 512). If the user specified a write
234 * block size, we use that to read. Under append, we must
235 * always keep blksz == rdblksz. Otherwise we go ahead and use
236 * the device optimal blocksize as (and if) returned by stat
237 * and if it is within pax specs.
239 if ((act == APPND) && wrblksz) {
240 blksz = rdblksz = wrblksz;
244 if ((arsb.st_blksize > 0) && (arsb.st_blksize < MAXBLK) &&
245 ((arsb.st_blksize % BLKMULT) == 0))
246 rdblksz = arsb.st_blksize;
250 * For performance go for large reads when we can without harm
252 if ((act == APPND) || (artyp == ISCHR))
259 * if the user specified wrblksz works, use it. Under appends
260 * we must always keep blksz == rdblksz
262 if ((act == APPND) && wrblksz && ((arsb.st_size%wrblksz)==0)){
263 blksz = rdblksz = wrblksz;
267 * See if we can find the blocking factor from the file size
269 for (rdblksz = MAXBLK; rdblksz > 0; rdblksz -= BLKMULT)
270 if ((arsb.st_size % rdblksz) == 0)
273 * When we cannot find a match, we may have a flawed archive.
278 * for performance go for large reads when we can
287 * should never happen, worse case, slow...
289 blksz = rdblksz = BLKMULT;
298 * closes archive device, increments volume number, and prints i/o summary
306 did_io = io_ok = flcnt = 0;
311 * Close archive file. This may take a LONG while on tapes (we may be
312 * forced to wait for the rewind to complete) so tell the user what is
313 * going on (this avoids the user hitting control-c thinking pax is
316 if (vflag && (artyp == ISTAPE)) {
318 (void)putc('\n', listf);
320 "%s: Waiting for tape drive close to complete...",
326 * if nothing was written to the archive (and we created it), we remove
329 if (can_unlnk && (fstat(arfd, &arsb) == 0) && (S_ISREG(arsb.st_mode)) &&
330 (arsb.st_size == 0)) {
331 (void)unlink(arcname);
336 * for a quick extract/list, pax frequently exits before the child
339 if ((act == LIST || act == EXTRACT) && nflag && zpid > 0)
344 /* Do not exit before child to ensure data integrity */
346 waitpid(zpid, &status, 0);
348 if (vflag && (artyp == ISTAPE)) {
349 (void)fputs("done.\n", listf);
355 if (!io_ok && !did_io) {
362 * The volume number is only increased when the last device has data
363 * and we have already determined the archive format.
374 * Print out a summary of I/O for this archive volume.
377 (void)putc('\n', listf);
382 * If we have not determined the format yet, we just say how many bytes
383 * we have skipped over looking for a header to id. There is no way we
384 * could have written anything yet.
388 (void)fprintf(listf, "%s: unknown format, %lu bytes skipped.\n",
391 (void)fprintf(listf, "%s: unknown format, %ju bytes skipped.\n",
392 argv0, (uintmax_t)rdcnt);
399 if (strcmp(NM_CPIO, argv0) == 0)
400 (void)fprintf(listf, "%llu blocks\n",
401 (unsigned long long)((rdcnt ? rdcnt : wrcnt) / 5120));
402 else if (strcmp(NM_TAR, argv0) != 0)
405 "%s: %s vol %d, %lu files, %lu bytes read, %lu bytes written.\n",
406 argv0, frmt->name, arvol-1, flcnt, rdcnt, wrcnt);
408 "%s: %s vol %d, %ju files, %ju bytes read, %ju bytes written.\n",
409 argv0, frmt->name, arvol-1, (uintmax_t)flcnt,
410 (uintmax_t)rdcnt, (uintmax_t)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).
430 * we only drain from a pipe/socket. Other devices can be closed
431 * without reading up to end of file. We sure hope that pipe is closed
432 * on the other side so we will get an EOF.
434 if ((artyp != ISPIPE) || (lstrval <= 0))
438 * keep reading until pipe is drained
440 while ((res = read(arfd, drbuf, sizeof(drbuf))) > 0)
447 * Set up device right before switching from read to write in an append.
448 * device dependent code (if required) to do this should be added here.
449 * For all archive devices we are already positioned at the place we want
450 * to start writing when this routine is called.
452 * 0 if all ready to write, -1 otherwise
461 * we must make sure the trailer is rewritten on append, ar_next()
462 * will stop us if the archive containing the trailer was not written
467 * Add any device dependent code as required here
472 * Ok we have an archive in a regular file. If we were rewriting a
473 * file, we must get rid of all the stuff after the current offset
474 * (it was not written by pax).
476 if (((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) ||
477 (ftruncate(arfd, cpos) < 0)) {
478 syswarn(1, errno, "Unable to truncate archive file");
486 * check if the last volume in the archive allows appends. We cannot check
487 * this until we are ready to write since there is no spec that says all
488 * volumes in a single archive have to be of the same type...
490 * 0 if we can append, -1 otherwise.
496 if (artyp == ISPIPE) {
497 paxwarn(1, "Cannot append to an archive obtained from a pipe.");
503 paxwarn(1,"Cannot append, device record size %d does not support %s spec",
510 * read up to a specified number of bytes from the archive into the
511 * supplied buffer. When dealing with tapes we may not always be able to
514 * Number of bytes in buffer. 0 for end of file, -1 for a read error.
518 ar_read(char *buf, int cnt)
523 * if last i/o was in error, no more reads until reset or new volume
529 * how we read must be based on device type
533 if ((res = read(arfd, buf, cnt)) > 0) {
535 * CAUTION: tape systems may not always return the same
536 * sized records so we leave blksz == MAXBLK. The
537 * physical record size that a tape drive supports is
538 * very hard to determine in a uniform and portable
542 if (res != rdblksz) {
544 * Record size changed. If this is happens on
545 * any record after the first, we probably have
546 * a tape drive which has a fixed record size
547 * we are getting multiple records in a single
548 * read). Watch out for record blocking that
549 * violates pax spec (must be a multiple of
553 if (rdblksz % BLKMULT)
565 * Files are so easy to deal with. These other things cannot
566 * be trusted at all. So when we are dealing with character
567 * devices and pipes we just take what they have ready for us
568 * and return. Trying to do anything else with them runs the
571 if ((res = read(arfd, buf, cnt)) > 0) {
579 * We are in trouble at this point, something is broken...
583 syswarn(1, errno, "Failed read on archive volume %d", arvol);
585 paxwarn(0, "End of archive volume %d reached", arvol);
591 * Write a specified number of bytes in supplied buffer to the archive
592 * device so it appears as a single "block". Deals with errors and tries
593 * to recover when faced with short writes.
595 * Number of bytes written. 0 indicates end of volume reached and with no
596 * flaws (as best that can be detected). A -1 indicates an unrecoverable
597 * error in the archive occurred.
601 ar_write(char *buf, int bsz)
607 * do not allow pax to create a "bad" archive. Once a write fails on
608 * an archive volume prevent further writes to it.
613 if ((res = write(arfd, buf, bsz)) == bsz) {
619 * write broke, see what we can do with it. We try to send any partial
620 * writes that may violate pax spec to the next archive volume.
629 if ((res > 0) && (res % BLKMULT)) {
631 * try to fix up partial writes which are not BLKMULT
632 * in size by forcing the runt record to next archive
635 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
638 if (ftruncate(arfd, cpos) < 0)
646 * if file is out of space, handle it like a return of 0
648 if ((errno == ENOSPC) || (errno == EFBIG) || (errno == EDQUOT))
656 if (errno == EACCES) {
657 paxwarn(0, "Write failed, archive is write protected.");
662 * see if we reached the end of media, if so force a change to
665 if ((errno == ENOSPC) || (errno == EIO) || (errno == ENXIO))
671 * we cannot fix errors to these devices
677 * Better tell the user the bad news...
678 * if this is a block aligned archive format, we may have a bad archive
679 * if the format wants the header to start at a BLKMULT boundary. While
680 * we can deal with the mis-aligned data, it violates spec and other
681 * archive readers will likely fail. If the format is not block
682 * aligned, the user may be lucky (and the archive is ok).
691 * If we were trying to rewrite the trailer and it didn't work, we
692 * must quit right away.
694 if (!wr_trail && (res <= 0)) {
695 paxwarn(1,"Unable to append, trailer re-write failed. Quitting.");
700 paxwarn(0, "End of archive volume %d reached", arvol);
702 syswarn(1, errno, "Failed write to archive volume: %d", arvol);
703 else if (!frmt->blkalgn || ((res % frmt->blkalgn) == 0))
704 paxwarn(0,"WARNING: partial archive write. Archive MAY BE FLAWED");
706 paxwarn(1,"WARNING: partial archive write. Archive IS FLAWED");
712 * Try to move past a bad spot on a flawed archive as needed to continue
713 * I/O. Clears error flags to allow I/O to continue.
715 * 0 when ok to try i/o again, -1 otherwise.
727 * Fail resync attempts at user request (done) or this is going to be
728 * an update/append to an existing archive. If last i/o hit media end,
729 * we need to go to the next volume not try a resync.
731 if ((done > 0) || (lstrval == 0))
734 if ((act == APPND) || (act == ARCHIVE)) {
735 paxwarn(1, "Cannot allow updates to an archive with flaws.");
744 * if the last i/o was a successful data transfer, we assume
745 * the fault is just a bad record on the tape that we are now
746 * past. If we did not get any data since the last resync try
747 * to move the tape forward one PHYSICAL record past any
748 * damaged tape section. Some tape drives are stubborn and need
758 if (ioctl(arfd, MTIOCTOP, &mb) < 0)
766 * try to step over the bad part of the device.
769 if (((fsbz = arsb.st_blksize) <= 0) || (artyp != ISREG))
771 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
773 mpos = fsbz - (cpos % (off_t)fsbz);
774 if (lseek(arfd, mpos, SEEK_CUR) < 0)
781 * cannot recover on these archive device types
787 paxwarn(1, "Unable to recover from an archive read failure.");
790 paxwarn(0, "Attempting to recover from an archive read failure.");
796 * Move the I/O position within the archive forward the specified number of
797 * bytes as supported by the device. If we cannot move the requested
798 * number of bytes, return the actual number of bytes moved in skipped.
800 * 0 if moved the requested distance, -1 on complete failure, 1 on
801 * partial move (the amount moved is in skipped)
805 ar_fow(off_t sksz, off_t *skipped)
815 * we cannot move forward at EOF or error
821 * Safer to read forward on devices where it is hard to find the end of
822 * the media without reading to it. With tapes we cannot be sure of the
823 * number of physical blocks to skip (we do not know physical block
824 * size at this point), so we must only read forward on tapes!
830 * figure out where we are in the archive
832 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) >= 0) {
834 * we can be asked to move farther than there are bytes in this
835 * volume, if so, just go to file end and let normal buf_fill()
836 * deal with the end of file (it will go to next volume by
839 if ((mpos = cpos + sksz) > arsb.st_size) {
840 *skipped = arsb.st_size - cpos;
844 if (lseek(arfd, mpos, SEEK_SET) >= 0)
847 syswarn(1, errno, "Forward positioning operation on archive failed");
854 * move the i/o position within the archive backwards the specified byte
855 * count as supported by the device. With tapes drives we RESET rdblksz to
856 * the PHYSICAL blocksize.
857 * NOTE: We should only be called to move backwards so we can rewrite the
858 * last records (the trailer) of an archive (APPEND).
860 * 0 if moved the requested distance, -1 on complete failure
871 * make sure we do not have try to reverse on a flawed archive
881 * cannot go backwards on these critters
883 paxwarn(1, "Reverse positioning on pipes is not supported.");
894 * For things other than files, backwards movement has a very
895 * high probability of failure as we really do not know the
896 * true attributes of the device we are talking to (the device
897 * may not even have the ability to lseek() in any direction).
898 * First we figure out where we are in the archive.
900 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) {
902 "Unable to obtain current archive byte offset");
908 * we may try to go backwards past the start when the archive
909 * is only a single record. If this happens and we are on a
910 * multi volume archive, we need to go to the end of the
911 * previous volume and continue our movement backwards from
914 if ((cpos -= sksz) < (off_t)0L) {
917 * this should never happen
919 paxwarn(1,"Reverse position on previous volume.");
925 if (lseek(arfd, cpos, SEEK_SET) < 0) {
926 syswarn(1, errno, "Unable to seek archive backwards");
933 * Calculate and move the proper number of PHYSICAL tape
934 * blocks. If the sksz is not an even multiple of the physical
935 * tape size, we cannot do the move (this should never happen).
936 * (We also cannot handler trailers spread over two vols).
937 * get_phys() also makes sure we are in front of the filemark.
939 if ((phyblk = get_phys()) <= 0) {
945 * make sure future tape reads only go by physical tape block
946 * size (set rdblksz to the real size).
951 * if no movement is required, just return (we must be after
952 * get_phys() so the physical blocksize is properly set)
958 * ok we have to move. Make sure the tape drive can do it.
962 "Tape drive unable to backspace requested amount");
968 * move backwards the requested number of bytes
971 mb.mt_count = sksz/phyblk;
972 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
973 syswarn(1,errno, "Unable to backspace tape %d blocks.",
986 * Determine the physical block size on a tape drive. We need the physical
987 * block size so we know how many bytes we skip over when we move with
988 * mtio commands. We also make sure we are BEFORE THE TAPE FILEMARK when
990 * This is one really SLOW routine...
992 * physical block size if ok (ok > 0), -1 otherwise
1005 * move to the file mark, and then back up one record and read it.
1006 * this should tell us the physical record size the tape is using.
1010 * we know we are at file mark when we get back a 0 from
1013 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1016 syswarn(1, errno, "Unable to locate tape filemark.");
1022 * move backwards over the file mark so we are at the end of the
1027 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1028 syswarn(1, errno, "Unable to backspace over tape filemark.");
1033 * move backwards so we are in front of the last record and read it to
1034 * get physical tape blocksize.
1038 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1039 syswarn(1, errno, "Unable to backspace over last tape block.");
1042 if ((phyblk = read(arfd, scbuf, sizeof(scbuf))) <= 0) {
1043 syswarn(1, errno, "Cannot determine archive tape blocksize.");
1048 * read forward to the file mark, then back up in front of the filemark
1049 * (this is a bit paranoid, but should be safe to do).
1051 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1054 syswarn(1, errno, "Unable to locate tape filemark.");
1059 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1060 syswarn(1, errno, "Unable to backspace over tape filemark.");
1065 * set lstrval so we know that the filemark has not been seen
1070 * return if there was no padding
1076 * make sure we can move backwards over the padding. (this should
1079 if (padsz % phyblk) {
1080 paxwarn(1, "Tape drive unable to backspace requested amount");
1085 * move backwards over the padding so the head is where it was when
1086 * we were first called (if required).
1089 mb.mt_count = padsz/phyblk;
1090 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1091 syswarn(1,errno,"Unable to backspace tape over %d pad blocks",
1100 * prompts the user for the next volume in this archive. For some devices
1101 * we may allow the media to be changed. Otherwise a new archive is
1102 * prompted for. By pax spec, if there is no controlling tty or an eof is
1103 * read on tty input, we must quit pax.
1105 * 0 when ready to continue, -1 when all done
1111 static char *arcbuf;
1112 char buf[PAXPATHLEN+2];
1116 * WE MUST CLOSE THE DEVICE. A lot of devices must see last close, (so
1117 * things like writing EOF etc will be done) (Watch out ar_close() can
1118 * also be called via a signal handler, so we must prevent a race.
1120 if (sigprocmask(SIG_BLOCK, &s_mask, &o_mask) < 0)
1121 syswarn(0, errno, "Unable to set signal mask");
1123 if (sigprocmask(SIG_SETMASK, &o_mask, NULL) < 0)
1124 syswarn(0, errno, "Unable to restore signal mask");
1126 if (done || !wr_trail || strcmp(NM_TAR, argv0) == 0)
1129 tty_prnt("\nATTENTION! %s archive volume change required.\n", argv0);
1132 * if i/o is on stdin or stdout, we cannot reopen it (we do not know
1133 * the name), the user will be forced to type it in.
1135 if (strcmp(arcname, stdo) && strcmp(arcname, stdn) && (artyp != ISREG)
1136 && (artyp != ISPIPE)) {
1137 if (artyp == ISTAPE) {
1138 tty_prnt("%s ready for archive tape volume: %d\n",
1140 tty_prnt("Load the NEXT TAPE on the tape drive");
1142 tty_prnt("%s ready for archive volume: %d\n",
1144 tty_prnt("Load the NEXT STORAGE MEDIA (if required)");
1147 if ((act == ARCHIVE) || (act == APPND))
1148 tty_prnt(" and make sure it is WRITE ENABLED.\n");
1153 tty_prnt("Type \"y\" to continue, \".\" to quit %s,",
1155 tty_prnt(" or \"s\" to switch to new device.\nIf you");
1156 tty_prnt(" cannot change storage media, type \"s\"\n");
1157 tty_prnt("Is the device ready and online? > ");
1159 if ((tty_read(buf,sizeof(buf))<0) || !strcmp(buf,".")){
1162 tty_prnt("Quitting %s!\n", argv0);
1167 if ((buf[0] == '\0') || (buf[1] != '\0')) {
1168 tty_prnt("%s unknown command, try again\n",buf);
1176 * we are to continue with the same device
1178 if (ar_open(arcname) >= 0)
1180 tty_prnt("Cannot re-open %s, try again\n",
1186 * user wants to open a different device
1188 tty_prnt("Switching to a different archive\n");
1191 tty_prnt("%s unknown command, try again\n",buf);
1197 tty_prnt("Ready for archive volume: %d\n", arvol);
1200 * have to go to a different archive
1203 tty_prnt("Input archive name or \".\" to quit %s.\n", argv0);
1204 tty_prnt("Archive name > ");
1206 if ((tty_read(buf, sizeof(buf)) < 0) || !strcmp(buf, ".")) {
1209 tty_prnt("Quitting %s!\n", argv0);
1213 if (buf[0] == '\0') {
1214 tty_prnt("Empty file name, try again\n");
1217 if (!strcmp(buf, "..")) {
1218 tty_prnt("Illegal file name: .. try again\n");
1221 if (strlen(buf) > PAXPATHLEN) {
1222 tty_prnt("File name too long, try again\n");
1227 * try to open new archive
1229 if (ar_open(buf) >= 0) {
1231 if ((arcbuf = strdup(buf)) == NULL) {
1234 paxwarn(0, "Cannot save archive name.");
1240 tty_prnt("Cannot open %s, try again\n", buf);
1248 * starts the gzip compression/decompression process as a child, using magic
1249 * to keep the fd the same in the calling function (parent).
1252 ar_start_gzip(int fd, const char *gzip_prog, int wr)
1255 const char *gzip_flags;
1258 err(1, "could not pipe");
1261 err(1, "could not fork");
1273 dup2(fds[0], STDIN_FILENO);
1274 dup2(fd, STDOUT_FILENO);
1277 dup2(fds[1], STDOUT_FILENO);
1278 dup2(fd, STDIN_FILENO);
1283 if (execlp(gzip_prog, gzip_prog, gzip_flags,
1285 err(1, "could not exec");