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 extern sigset_t s_mask;
89 static void ar_start_gzip(int, const char *, int);
93 * Opens the next archive volume. Determines the type of the device and
94 * sets up block sizes as required by the archive device and the format.
95 * Note: we may be called with name == NULL on the first open only.
97 * -1 on failure, 0 otherwise
101 ar_open(const char *name)
108 can_unlnk = did_io = io_ok = invld_rec = 0;
113 * open based on overall operation mode
121 } else if ((arfd = open(name, EXT_MODE, DMOD)) < 0)
122 syswarn(0, errno, "Failed open to read on %s", name);
123 if (arfd != -1 && gzip_program != NULL)
124 ar_start_gzip(arfd, gzip_program, 0);
128 arfd = STDOUT_FILENO;
130 } else if ((arfd = open(name, AR_MODE, DMOD)) < 0)
131 syswarn(0, errno, "Failed open to write on %s", name);
134 if (arfd != -1 && gzip_program != NULL)
135 ar_start_gzip(arfd, gzip_program, 1);
139 arfd = STDOUT_FILENO;
141 } else if ((arfd = open(name, APP_MODE, DMOD)) < 0)
142 syswarn(0, errno, "Failed open to read/write on %s",
147 * arfd not used in COPY mode
157 if (chdir(chdname) != 0) {
158 syswarn(1, errno, "Failed chdir to %s", chdname);
162 * set up is based on device type
164 if (fstat(arfd, &arsb) < 0) {
165 syswarn(0, errno, "Failed stat on %s", arcname);
171 if (S_ISDIR(arsb.st_mode)) {
172 paxwarn(0, "Cannot write an archive on top of a directory %s",
180 if (S_ISCHR(arsb.st_mode))
181 artyp = ioctl(arfd, MTIOCGET, &mb) ? ISCHR : ISTAPE;
182 else if (S_ISBLK(arsb.st_mode))
184 else if ((lseek(arfd, (off_t)0L, SEEK_CUR) == -1) && (errno == ESPIPE))
190 * make sure we beyond any doubt that we only can unlink regular files
196 * if we are writing, we are done
198 if (act == ARCHIVE) {
199 blksz = rdblksz = wrblksz;
205 * set default blksz on read. APPNDs writes rdblksz on the last volume
206 * On all new archive volumes, we shift to wrblksz (if the user
207 * specified one, otherwize we will continue to use rdblksz). We
208 * must to set blocksize based on what kind of device the archive is
214 * Tape drives come in at least two flavors. Those that support
215 * variable sized records and those that have fixed sized
216 * records. They must be treated differently. For tape drives
217 * that support variable sized records, we must make large
218 * reads to make sure we get the entire record, otherwise we
219 * will just get the first part of the record (up to size we
220 * asked). Tapes with fixed sized records may or may not return
221 * multiple records in a single read. We really do not care
222 * what the physical record size is UNLESS we are going to
223 * append. (We will need the physical block size to rewrite
224 * the trailer). Only when we are appending do we go to the
225 * effort to figure out the true PHYSICAL record size.
227 blksz = rdblksz = MAXBLK;
233 * Blocksize is not a major issue with these devices (but must
234 * be kept a multiple of 512). If the user specified a write
235 * block size, we use that to read. Under append, we must
236 * always keep blksz == rdblksz. Otherwise we go ahead and use
237 * the device optimal blocksize as (and if) returned by stat
238 * and if it is within pax specs.
240 if ((act == APPND) && wrblksz) {
241 blksz = rdblksz = wrblksz;
245 if ((arsb.st_blksize > 0) && (arsb.st_blksize < MAXBLK) &&
246 ((arsb.st_blksize % BLKMULT) == 0))
247 rdblksz = arsb.st_blksize;
251 * For performance go for large reads when we can without harm
253 if ((act == APPND) || (artyp == ISCHR))
260 * if the user specified wrblksz works, use it. Under appends
261 * we must always keep blksz == rdblksz
263 if ((act == APPND) && wrblksz && ((arsb.st_size%wrblksz)==0)){
264 blksz = rdblksz = wrblksz;
268 * See if we can find the blocking factor from the file size
270 for (rdblksz = MAXBLK; rdblksz > 0; rdblksz -= BLKMULT)
271 if ((arsb.st_size % rdblksz) == 0)
274 * When we cannot find a match, we may have a flawed archive.
279 * for performance go for large reads when we can
288 * should never happen, worse case, slow...
290 blksz = rdblksz = BLKMULT;
299 * closes archive device, increments volume number, and prints i/o summary
307 did_io = io_ok = flcnt = 0;
312 * Close archive file. This may take a LONG while on tapes (we may be
313 * forced to wait for the rewind to complete) so tell the user what is
314 * going on (this avoids the user hitting control-c thinking pax is
317 if (vflag && (artyp == ISTAPE)) {
319 (void)putc('\n', listf);
321 "%s: Waiting for tape drive close to complete...",
327 * if nothing was written to the archive (and we created it), we remove
330 if (can_unlnk && (fstat(arfd, &arsb) == 0) && (S_ISREG(arsb.st_mode)) &&
331 (arsb.st_size == 0)) {
332 (void)unlink(arcname);
337 * for a quick extract/list, pax frequently exits before the child
340 if ((act == LIST || act == EXTRACT) && nflag && zpid > 0)
345 /* Do not exit before child to ensure data integrity */
347 waitpid(zpid, &status, 0);
349 if (vflag && (artyp == ISTAPE)) {
350 (void)fputs("done.\n", listf);
356 if (!io_ok && !did_io) {
363 * The volume number is only increased when the last device has data
364 * and we have already determined the archive format.
375 * Print out a summary of I/O for this archive volume.
378 (void)putc('\n', listf);
383 * If we have not determined the format yet, we just say how many bytes
384 * we have skipped over looking for a header to id. there is no way we
385 * could have written anything yet.
389 (void)fprintf(listf, "%s: unknown format, %lu bytes skipped.\n",
392 (void)fprintf(listf, "%s: unknown format, %ju bytes skipped.\n",
393 argv0, (uintmax_t)rdcnt);
400 if (strcmp(NM_CPIO, argv0) == 0)
401 (void)fprintf(listf, "%llu blocks\n",
402 (unsigned long long)((rdcnt ? rdcnt : wrcnt) / 5120));
403 else if (strcmp(NM_TAR, argv0) != 0)
406 "%s: %s vol %d, %lu files, %lu bytes read, %lu bytes written.\n",
407 argv0, frmt->name, arvol-1, flcnt, rdcnt, wrcnt);
409 "%s: %s vol %d, %ju files, %ju bytes read, %ju bytes written.\n",
410 argv0, frmt->name, arvol-1, (uintmax_t)flcnt,
411 (uintmax_t)rdcnt, (uintmax_t)wrcnt);
419 * drain any archive format independent padding from an archive read
420 * from a socket or a pipe. This is to prevent the process on the
421 * other side of the pipe from getting a SIGPIPE (pax will stop
422 * reading an archive once a format dependent trailer is detected).
431 * we only drain from a pipe/socket. Other devices can be closed
432 * without reading up to end of file. We sure hope that pipe is closed
433 * on the other side so we will get an EOF.
435 if ((artyp != ISPIPE) || (lstrval <= 0))
439 * keep reading until pipe is drained
441 while ((res = read(arfd, drbuf, sizeof(drbuf))) > 0)
448 * Set up device right before switching from read to write in an append.
449 * device dependent code (if required) to do this should be added here.
450 * For all archive devices we are already positioned at the place we want
451 * to start writing when this routine is called.
453 * 0 if all ready to write, -1 otherwise
462 * we must make sure the trailer is rewritten on append, ar_next()
463 * will stop us if the archive containing the trailer was not written
468 * Add any device dependent code as required here
473 * Ok we have an archive in a regular file. If we were rewriting a
474 * file, we must get rid of all the stuff after the current offset
475 * (it was not written by pax).
477 if (((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) ||
478 (ftruncate(arfd, cpos) < 0)) {
479 syswarn(1, errno, "Unable to truncate archive file");
487 * check if the last volume in the archive allows appends. We cannot check
488 * this until we are ready to write since there is no spec that says all
489 * volumes in a single archive have to be of the same type...
491 * 0 if we can append, -1 otherwise.
497 if (artyp == ISPIPE) {
498 paxwarn(1, "Cannot append to an archive obtained from a pipe.");
504 paxwarn(1,"Cannot append, device record size %d does not support %s spec",
511 * read up to a specified number of bytes from the archive into the
512 * supplied buffer. When dealing with tapes we may not always be able to
515 * Number of bytes in buffer. 0 for end of file, -1 for a read error.
519 ar_read(char *buf, int cnt)
524 * if last i/o was in error, no more reads until reset or new volume
530 * how we read must be based on device type
534 if ((res = read(arfd, buf, cnt)) > 0) {
536 * CAUTION: tape systems may not always return the same
537 * sized records so we leave blksz == MAXBLK. The
538 * physical record size that a tape drive supports is
539 * very hard to determine in a uniform and portable
543 if (res != rdblksz) {
545 * Record size changed. If this is happens on
546 * any record after the first, we probably have
547 * a tape drive which has a fixed record size
548 * we are getting multiple records in a single
549 * read). Watch out for record blocking that
550 * violates pax spec (must be a multiple of
554 if (rdblksz % BLKMULT)
566 * Files are so easy to deal with. These other things cannot
567 * be trusted at all. So when we are dealing with character
568 * devices and pipes we just take what they have ready for us
569 * and return. Trying to do anything else with them runs the
572 if ((res = read(arfd, buf, cnt)) > 0) {
580 * We are in trouble at this point, something is broken...
584 syswarn(1, errno, "Failed read on archive volume %d", arvol);
586 paxwarn(0, "End of archive volume %d reached", arvol);
592 * Write a specified number of bytes in supplied buffer to the archive
593 * device so it appears as a single "block". Deals with errors and tries
594 * to recover when faced with short writes.
596 * Number of bytes written. 0 indicates end of volume reached and with no
597 * flaws (as best that can be detected). A -1 indicates an unrecoverable
598 * error in the archive occured.
602 ar_write(char *buf, int bsz)
608 * do not allow pax to create a "bad" archive. Once a write fails on
609 * an archive volume prevent further writes to it.
614 if ((res = write(arfd, buf, bsz)) == bsz) {
620 * write broke, see what we can do with it. We try to send any partial
621 * writes that may violate pax spec to the next archive volume.
630 if ((res > 0) && (res % BLKMULT)) {
632 * try to fix up partial writes which are not BLKMULT
633 * in size by forcing the runt record to next archive
636 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
639 if (ftruncate(arfd, cpos) < 0)
647 * if file is out of space, handle it like a return of 0
649 if ((errno == ENOSPC) || (errno == EFBIG) || (errno == EDQUOT))
657 if (errno == EACCES) {
658 paxwarn(0, "Write failed, archive is write protected.");
663 * see if we reached the end of media, if so force a change to
666 if ((errno == ENOSPC) || (errno == EIO) || (errno == ENXIO))
672 * we cannot fix errors to these devices
678 * Better tell the user the bad news...
679 * if this is a block aligned archive format, we may have a bad archive
680 * if the format wants the header to start at a BLKMULT boundary. While
681 * we can deal with the mis-aligned data, it violates spec and other
682 * archive readers will likely fail. if the format is not block
683 * aligned, the user may be lucky (and the archive is ok).
692 * If we were trying to rewrite the trailer and it didn't work, we
693 * must quit right away.
695 if (!wr_trail && (res <= 0)) {
696 paxwarn(1,"Unable to append, trailer re-write failed. Quitting.");
701 paxwarn(0, "End of archive volume %d reached", arvol);
703 syswarn(1, errno, "Failed write to archive volume: %d", arvol);
704 else if (!frmt->blkalgn || ((res % frmt->blkalgn) == 0))
705 paxwarn(0,"WARNING: partial archive write. Archive MAY BE FLAWED");
707 paxwarn(1,"WARNING: partial archive write. Archive IS FLAWED");
713 * Try to move past a bad spot on a flawed archive as needed to continue
714 * I/O. Clears error flags to allow I/O to continue.
716 * 0 when ok to try i/o again, -1 otherwise.
728 * Fail resync attempts at user request (done) or this is going to be
729 * an update/append to an existing archive. If last i/o hit media end,
730 * we need to go to the next volume not try a resync.
732 if ((done > 0) || (lstrval == 0))
735 if ((act == APPND) || (act == ARCHIVE)) {
736 paxwarn(1, "Cannot allow updates to an archive with flaws.");
745 * if the last i/o was a successful data transfer, we assume
746 * the fault is just a bad record on the tape that we are now
747 * past. If we did not get any data since the last resync try
748 * to move the tape forward one PHYSICAL record past any
749 * damaged tape section. Some tape drives are stubborn and need
759 if (ioctl(arfd, MTIOCTOP, &mb) < 0)
767 * try to step over the bad part of the device.
770 if (((fsbz = arsb.st_blksize) <= 0) || (artyp != ISREG))
772 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0)
774 mpos = fsbz - (cpos % (off_t)fsbz);
775 if (lseek(arfd, mpos, SEEK_CUR) < 0)
782 * cannot recover on these archive device types
788 paxwarn(1, "Unable to recover from an archive read failure.");
791 paxwarn(0, "Attempting to recover from an archive read failure.");
797 * Move the I/O position within the archive foward the specified number of
798 * bytes as supported by the device. If we cannot move the requested
799 * number of bytes, return the actual number of bytes moved in skipped.
801 * 0 if moved the requested distance, -1 on complete failure, 1 on
802 * partial move (the amount moved is in skipped)
806 ar_fow(off_t sksz, off_t *skipped)
816 * we cannot move foward at EOF or error
822 * Safer to read forward on devices where it is hard to find the end of
823 * the media without reading to it. With tapes we cannot be sure of the
824 * number of physical blocks to skip (we do not know physical block
825 * size at this point), so we must only read foward on tapes!
831 * figure out where we are in the archive
833 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) >= 0) {
835 * we can be asked to move farther than there are bytes in this
836 * volume, if so, just go to file end and let normal buf_fill()
837 * deal with the end of file (it will go to next volume by
840 if ((mpos = cpos + sksz) > arsb.st_size) {
841 *skipped = arsb.st_size - cpos;
845 if (lseek(arfd, mpos, SEEK_SET) >= 0)
848 syswarn(1, errno, "Forward positioning operation on archive failed");
855 * move the i/o position within the archive backwards the specified byte
856 * count as supported by the device. With tapes drives we RESET rdblksz to
857 * the PHYSICAL blocksize.
858 * NOTE: We should only be called to move backwards so we can rewrite the
859 * last records (the trailer) of an archive (APPEND).
861 * 0 if moved the requested distance, -1 on complete failure
872 * make sure we do not have try to reverse on a flawed archive
882 * cannot go backwards on these critters
884 paxwarn(1, "Reverse positioning on pipes is not supported.");
895 * For things other than files, backwards movement has a very
896 * high probability of failure as we really do not know the
897 * true attributes of the device we are talking to (the device
898 * may not even have the ability to lseek() in any direction).
899 * First we figure out where we are in the archive.
901 if ((cpos = lseek(arfd, (off_t)0L, SEEK_CUR)) < 0) {
903 "Unable to obtain current archive byte offset");
909 * we may try to go backwards past the start when the archive
910 * is only a single record. If this hapens and we are on a
911 * multi volume archive, we need to go to the end of the
912 * previous volume and continue our movement backwards from
915 if ((cpos -= sksz) < (off_t)0L) {
918 * this should never happen
920 paxwarn(1,"Reverse position on previous volume.");
926 if (lseek(arfd, cpos, SEEK_SET) < 0) {
927 syswarn(1, errno, "Unable to seek archive backwards");
934 * Calculate and move the proper number of PHYSICAL tape
935 * blocks. If the sksz is not an even multiple of the physical
936 * tape size, we cannot do the move (this should never happen).
937 * (We also cannot handler trailers spread over two vols).
938 * get_phys() also makes sure we are in front of the filemark.
940 if ((phyblk = get_phys()) <= 0) {
946 * make sure future tape reads only go by physical tape block
947 * size (set rdblksz to the real size).
952 * if no movement is required, just return (we must be after
953 * get_phys() so the physical blocksize is properly set)
959 * ok we have to move. Make sure the tape drive can do it.
963 "Tape drive unable to backspace requested amount");
969 * move backwards the requested number of bytes
972 mb.mt_count = sksz/phyblk;
973 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
974 syswarn(1,errno, "Unable to backspace tape %d blocks.",
987 * Determine the physical block size on a tape drive. We need the physical
988 * block size so we know how many bytes we skip over when we move with
989 * mtio commands. We also make sure we are BEFORE THE TAPE FILEMARK when
991 * This is one really SLOW routine...
993 * physical block size if ok (ok > 0), -1 otherwise
1006 * move to the file mark, and then back up one record and read it.
1007 * this should tell us the physical record size the tape is using.
1011 * we know we are at file mark when we get back a 0 from
1014 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1017 syswarn(1, errno, "Unable to locate tape filemark.");
1023 * move backwards over the file mark so we are at the end of the
1028 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1029 syswarn(1, errno, "Unable to backspace over tape filemark.");
1034 * move backwards so we are in front of the last record and read it to
1035 * get physical tape blocksize.
1039 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1040 syswarn(1, errno, "Unable to backspace over last tape block.");
1043 if ((phyblk = read(arfd, scbuf, sizeof(scbuf))) <= 0) {
1044 syswarn(1, errno, "Cannot determine archive tape blocksize.");
1049 * read foward to the file mark, then back up in front of the filemark
1050 * (this is a bit paranoid, but should be safe to do).
1052 while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0)
1055 syswarn(1, errno, "Unable to locate tape filemark.");
1060 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1061 syswarn(1, errno, "Unable to backspace over tape filemark.");
1066 * set lstrval so we know that the filemark has not been seen
1071 * return if there was no padding
1077 * make sure we can move backwards over the padding. (this should
1080 if (padsz % phyblk) {
1081 paxwarn(1, "Tape drive unable to backspace requested amount");
1086 * move backwards over the padding so the head is where it was when
1087 * we were first called (if required).
1090 mb.mt_count = padsz/phyblk;
1091 if (ioctl(arfd, MTIOCTOP, &mb) < 0) {
1092 syswarn(1,errno,"Unable to backspace tape over %d pad blocks",
1101 * prompts the user for the next volume in this archive. For some devices
1102 * we may allow the media to be changed. Otherwise a new archive is
1103 * prompted for. By pax spec, if there is no controlling tty or an eof is
1104 * read on tty input, we must quit pax.
1106 * 0 when ready to continue, -1 when all done
1112 static char *arcbuf;
1113 char buf[PAXPATHLEN+2];
1117 * WE MUST CLOSE THE DEVICE. A lot of devices must see last close, (so
1118 * things like writing EOF etc will be done) (Watch out ar_close() can
1119 * also be called via a signal handler, so we must prevent a race.
1121 if (sigprocmask(SIG_BLOCK, &s_mask, &o_mask) < 0)
1122 syswarn(0, errno, "Unable to set signal mask");
1124 if (sigprocmask(SIG_SETMASK, &o_mask, NULL) < 0)
1125 syswarn(0, errno, "Unable to restore signal mask");
1127 if (done || !wr_trail || strcmp(NM_TAR, argv0) == 0)
1130 tty_prnt("\nATTENTION! %s archive volume change required.\n", argv0);
1133 * if i/o is on stdin or stdout, we cannot reopen it (we do not know
1134 * the name), the user will be forced to type it in.
1136 if (strcmp(arcname, stdo) && strcmp(arcname, stdn) && (artyp != ISREG)
1137 && (artyp != ISPIPE)) {
1138 if (artyp == ISTAPE) {
1139 tty_prnt("%s ready for archive tape volume: %d\n",
1141 tty_prnt("Load the NEXT TAPE on the tape drive");
1143 tty_prnt("%s ready for archive volume: %d\n",
1145 tty_prnt("Load the NEXT STORAGE MEDIA (if required)");
1148 if ((act == ARCHIVE) || (act == APPND))
1149 tty_prnt(" and make sure it is WRITE ENABLED.\n");
1154 tty_prnt("Type \"y\" to continue, \".\" to quit %s,",
1156 tty_prnt(" or \"s\" to switch to new device.\nIf you");
1157 tty_prnt(" cannot change storage media, type \"s\"\n");
1158 tty_prnt("Is the device ready and online? > ");
1160 if ((tty_read(buf,sizeof(buf))<0) || !strcmp(buf,".")){
1163 tty_prnt("Quitting %s!\n", argv0);
1168 if ((buf[0] == '\0') || (buf[1] != '\0')) {
1169 tty_prnt("%s unknown command, try again\n",buf);
1177 * we are to continue with the same device
1179 if (ar_open(arcname) >= 0)
1181 tty_prnt("Cannot re-open %s, try again\n",
1187 * user wants to open a different device
1189 tty_prnt("Switching to a different archive\n");
1192 tty_prnt("%s unknown command, try again\n",buf);
1198 tty_prnt("Ready for archive volume: %d\n", arvol);
1201 * have to go to a different archive
1204 tty_prnt("Input archive name or \".\" to quit %s.\n", argv0);
1205 tty_prnt("Archive name > ");
1207 if ((tty_read(buf, sizeof(buf)) < 0) || !strcmp(buf, ".")) {
1210 tty_prnt("Quitting %s!\n", argv0);
1214 if (buf[0] == '\0') {
1215 tty_prnt("Empty file name, try again\n");
1218 if (!strcmp(buf, "..")) {
1219 tty_prnt("Illegal file name: .. try again\n");
1222 if (strlen(buf) > PAXPATHLEN) {
1223 tty_prnt("File name too long, try again\n");
1228 * try to open new archive
1230 if (ar_open(buf) >= 0) {
1232 if ((arcbuf = strdup(buf)) == NULL) {
1235 paxwarn(0, "Cannot save archive name.");
1241 tty_prnt("Cannot open %s, try again\n", buf);
1249 * starts the gzip compression/decompression process as a child, using magic
1250 * to keep the fd the same in the calling function (parent).
1253 ar_start_gzip(int fd, const char *gzip_prog, int wr)
1256 const char *gzip_flags;
1259 err(1, "could not pipe");
1262 err(1, "could not fork");
1274 dup2(fds[0], STDIN_FILENO);
1275 dup2(fd, STDOUT_FILENO);
1278 dup2(fds[1], STDOUT_FILENO);
1279 dup2(fd, STDIN_FILENO);
1284 if (execlp(gzip_prog, gzip_prog, gzip_flags,
1286 err(1, "could not exec");