1994-05-26 06:35:07 +00:00
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/*-
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2017-11-20 19:49:47 +00:00
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* SPDX-License-Identifier: BSD-3-Clause
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*
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1994-05-26 06:35:07 +00:00
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* Copyright (c) 1980, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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2017-02-28 23:42:47 +00:00
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* 3. Neither the name of the University nor the names of its contributors
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1994-05-26 06:35:07 +00:00
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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1998-06-15 06:58:13 +00:00
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#if 0
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1997-03-11 12:09:50 +00:00
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static char sccsid[] = "@(#)tape.c 8.4 (Berkeley) 5/1/95";
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1998-06-15 06:58:13 +00:00
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#endif
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static const char rcsid[] =
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1999-08-28 00:22:10 +00:00
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"$FreeBSD$";
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1994-05-26 06:35:07 +00:00
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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2002-02-11 00:50:50 +00:00
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#include <sys/stat.h>
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1994-05-26 06:35:07 +00:00
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#include <ufs/ufs/dinode.h>
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1997-03-11 12:09:50 +00:00
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#include <ufs/ffs/fs.h>
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1994-05-26 06:35:07 +00:00
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#include <protocols/dumprestore.h>
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2018-06-11 19:32:36 +00:00
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#include <assert.h>
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1994-05-26 06:35:07 +00:00
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#include <errno.h>
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#include <fcntl.h>
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2002-09-25 04:06:37 +00:00
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#include <limits.h>
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1994-05-26 06:35:07 +00:00
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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2011-01-24 06:17:05 +00:00
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#include <time.h>
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1994-05-26 06:35:07 +00:00
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#include <unistd.h>
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#include "dump.h"
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2020-04-04 00:56:56 +00:00
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ino_t curino; /* current inumber; used globally */
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int newtape; /* new tape flag */
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union u_spcl u_spcl; /* mapping of variables in a control block */
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static int tapefd; /* tape file descriptor */
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static long asize; /* number of 0.1" units written on cur tape */
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static int writesize; /* size of malloc()ed buffer for tape */
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static int64_t lastspclrec = -1; /* tape block number of last written header */
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static int trecno = 0; /* next record to write in current block */
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static long blocksthisvol; /* number of blocks on current output file */
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static char *nexttape;
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static FILE *popenfp = NULL;
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1994-05-26 06:35:07 +00:00
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2023-03-22 22:57:26 +00:00
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static int atomic_read(int, void *, int);
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static int atomic_write(int, const void *, int);
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2020-06-20 20:14:50 +00:00
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static void worker(int, int);
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2020-06-23 21:11:40 +00:00
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static void create_workers(void);
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2002-03-20 22:49:40 +00:00
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static void flushtape(void);
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static void killall(void);
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static void rollforward(void);
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1994-05-26 06:35:07 +00:00
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/*
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* Concurrent dump mods (Caltech) - disk block reading and tape writing
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2020-06-20 20:14:50 +00:00
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* are exported to several worker processes. While one worker writes the
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1994-05-26 06:35:07 +00:00
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* tape, the others read disk blocks; they pass control of the tape in
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2002-08-21 18:11:48 +00:00
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* a ring via signals. The parent process traverses the file system and
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2020-06-20 20:14:50 +00:00
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* sends writeheader()'s and lists of daddr's to the workers via pipes.
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* The following structure defines the instruction packets sent to workers.
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1994-05-26 06:35:07 +00:00
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*/
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struct req {
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2002-06-21 06:18:05 +00:00
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ufs2_daddr_t dblk;
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1994-05-26 06:35:07 +00:00
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int count;
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};
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2020-04-04 00:56:56 +00:00
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static int reqsiz;
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1994-05-26 06:35:07 +00:00
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2020-06-20 20:14:50 +00:00
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#define WORKERS 3 /* 1 worker writing, 1 reading, 1 for slack */
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static struct worker {
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2002-06-21 06:18:05 +00:00
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int64_t tapea; /* header number at start of this chunk */
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int64_t firstrec; /* record number of this block */
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1994-05-26 06:35:07 +00:00
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int count; /* count to next header (used for TS_TAPE */
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/* after EOT) */
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int inode; /* inode that we are currently dealing with */
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2020-06-20 20:14:50 +00:00
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int fd; /* FD for this worker */
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int pid; /* PID for this worker */
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int sent; /* 1 == we've sent this worker requests */
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1994-05-26 06:35:07 +00:00
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char (*tblock)[TP_BSIZE]; /* buffer for data blocks */
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struct req *req; /* buffer for requests */
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2020-06-20 20:14:50 +00:00
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} workers[WORKERS+1];
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2020-06-23 21:11:40 +00:00
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static struct worker *wp;
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1994-05-26 06:35:07 +00:00
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2020-04-04 00:56:56 +00:00
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static char (*nextblock)[TP_BSIZE];
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1994-05-26 06:35:07 +00:00
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2020-04-04 00:56:56 +00:00
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static int master; /* pid of master, for sending error signals */
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static int tenths; /* length of tape used per block written */
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2005-03-02 02:30:08 +00:00
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static volatile sig_atomic_t caught; /* have we caught the signal to proceed? */
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static volatile sig_atomic_t ready; /* reached the lock point without having */
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2020-06-20 20:14:50 +00:00
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/* received the SIGUSR2 signal from the prev worker? */
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1994-05-26 06:35:07 +00:00
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static jmp_buf jmpbuf; /* where to jump to if we are ready when the */
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2020-06-20 20:14:50 +00:00
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/* SIGUSR2 arrives from the previous worker */
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1994-05-26 06:35:07 +00:00
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int
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2002-03-20 22:49:40 +00:00
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alloctape(void)
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1994-05-26 06:35:07 +00:00
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{
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int pgoff = getpagesize() - 1;
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char *buf;
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int i;
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writesize = ntrec * TP_BSIZE;
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reqsiz = (ntrec + 1) * sizeof(struct req);
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/*
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* CDC 92181's and 92185's make 0.8" gaps in 1600-bpi start/stop mode
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* (see DEC TU80 User's Guide). The shorter gaps of 6250-bpi require
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* repositioning after stopping, i.e, streaming mode, where the gap is
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* variable, 0.30" to 0.45". The gap is maximal when the tape stops.
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*/
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1997-02-01 23:44:19 +00:00
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if (blocksperfile == 0 && !unlimited)
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1994-05-26 06:35:07 +00:00
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tenths = writesize / density +
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(cartridge ? 16 : density == 625 ? 5 : 8);
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/*
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* Allocate tape buffer contiguous with the array of instruction
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* packets, so flushtape() can write them together with one write().
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* Align tape buffer on page boundary to speed up tape write().
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*/
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2020-06-20 20:14:50 +00:00
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for (i = 0; i <= WORKERS; i++) {
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1994-05-26 06:35:07 +00:00
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buf = (char *)
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malloc((unsigned)(reqsiz + writesize + pgoff + TP_BSIZE));
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if (buf == NULL)
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return(0);
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2020-06-20 20:14:50 +00:00
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workers[i].tblock = (char (*)[TP_BSIZE])
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1994-05-26 06:35:07 +00:00
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(((long)&buf[ntrec + 1] + pgoff) &~ pgoff);
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2020-06-20 20:14:50 +00:00
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workers[i].req = (struct req *)workers[i].tblock - ntrec - 1;
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1994-05-26 06:35:07 +00:00
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}
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2020-06-23 21:11:40 +00:00
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wp = &workers[0];
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wp->count = 1;
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wp->tapea = 0;
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wp->firstrec = 0;
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nextblock = wp->tblock;
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1994-05-26 06:35:07 +00:00
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return(1);
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}
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void
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2002-03-20 22:49:40 +00:00
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writerec(char *dp, int isspcl)
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1994-05-26 06:35:07 +00:00
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{
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2020-06-23 21:11:40 +00:00
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wp->req[trecno].dblk = (ufs2_daddr_t)0;
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wp->req[trecno].count = 1;
|
2002-03-20 22:49:40 +00:00
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/* Can't do a structure assignment due to alignment problems */
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1999-05-03 13:53:16 +00:00
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bcopy(dp, *(nextblock)++, sizeof (union u_spcl));
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1994-05-26 06:35:07 +00:00
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if (isspcl)
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lastspclrec = spcl.c_tapea;
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trecno++;
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spcl.c_tapea++;
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if (trecno >= ntrec)
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flushtape();
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}
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void
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2002-06-21 06:18:05 +00:00
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dumpblock(ufs2_daddr_t blkno, int size)
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1994-05-26 06:35:07 +00:00
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{
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2002-06-21 06:18:05 +00:00
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int avail, tpblks;
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ufs2_daddr_t dblkno;
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1994-05-26 06:35:07 +00:00
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dblkno = fsbtodb(sblock, blkno);
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tpblks = size >> tp_bshift;
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while ((avail = MIN(tpblks, ntrec - trecno)) > 0) {
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2020-06-23 21:11:40 +00:00
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wp->req[trecno].dblk = dblkno;
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wp->req[trecno].count = avail;
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1994-05-26 06:35:07 +00:00
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trecno += avail;
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spcl.c_tapea += avail;
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if (trecno >= ntrec)
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flushtape();
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dblkno += avail << (tp_bshift - dev_bshift);
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tpblks -= avail;
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}
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}
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int nogripe = 0;
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void
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2002-03-20 22:49:40 +00:00
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tperror(int signo __unused)
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1994-05-26 06:35:07 +00:00
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{
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if (pipeout) {
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msg("write error on %s\n", tape);
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quit("Cannot recover\n");
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/* NOTREACHED */
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}
|
2002-07-07 12:30:20 +00:00
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msg("write error %ld blocks into volume %d\n", blocksthisvol, tapeno);
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1994-05-26 06:35:07 +00:00
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broadcast("DUMP WRITE ERROR!\n");
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if (!query("Do you want to restart?"))
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dumpabort(0);
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msg("Closing this volume. Prepare to restart with new media;\n");
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msg("this dump volume will be rewritten.\n");
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killall();
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nogripe = 1;
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close_rewind();
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Exit(X_REWRITE);
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}
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void
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2002-03-20 22:49:40 +00:00
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sigpipe(int signo __unused)
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1994-05-26 06:35:07 +00:00
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{
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quit("Broken pipe\n");
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}
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static void
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2002-03-20 22:49:40 +00:00
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flushtape(void)
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1994-05-26 06:35:07 +00:00
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{
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int i, blks, got;
|
2002-06-21 06:18:05 +00:00
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int64_t lastfirstrec;
|
1994-05-26 06:35:07 +00:00
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2020-06-23 21:11:40 +00:00
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int siz = (char *)nextblock - (char *)wp->req;
|
1994-05-26 06:35:07 +00:00
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2020-06-23 21:11:40 +00:00
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wp->req[trecno].count = 0; /* Sentinel */
|
1994-05-26 06:35:07 +00:00
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2023-03-22 22:57:26 +00:00
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if (atomic_write(wp->fd, (const void *)wp->req, siz) != siz)
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1994-05-26 06:35:07 +00:00
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quit("error writing command pipe: %s\n", strerror(errno));
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2020-06-23 21:11:40 +00:00
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wp->sent = 1; /* we sent a request, read the response later */
|
1994-05-26 06:35:07 +00:00
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2020-06-23 21:11:40 +00:00
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lastfirstrec = wp->firstrec;
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1994-05-26 06:35:07 +00:00
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2020-06-23 21:11:40 +00:00
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if (++wp >= &workers[WORKERS])
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wp = &workers[0];
|
1994-05-26 06:35:07 +00:00
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|
2020-06-20 20:14:50 +00:00
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/* Read results back from next worker */
|
2020-06-23 21:11:40 +00:00
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if (wp->sent) {
|
2023-03-22 22:57:26 +00:00
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if (atomic_read(wp->fd, (void *)&got, sizeof got)
|
1994-05-26 06:35:07 +00:00
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!= sizeof got) {
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perror(" DUMP: error reading command pipe in master");
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dumpabort(0);
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}
|
2020-06-23 21:11:40 +00:00
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wp->sent = 0;
|
1994-05-26 06:35:07 +00:00
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/* Check for end of tape */
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if (got < writesize) {
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msg("End of tape detected\n");
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/*
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|
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* Drain the results, don't care what the values were.
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* If we read them here then trewind won't...
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*/
|
2020-06-20 20:14:50 +00:00
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for (i = 0; i < WORKERS; i++) {
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if (workers[i].sent) {
|
2023-03-22 22:57:26 +00:00
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if (atomic_read(workers[i].fd,
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(void *)&got, sizeof got)
|
1994-05-26 06:35:07 +00:00
|
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!= sizeof got) {
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perror(" DUMP: error reading command pipe in master");
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|
dumpabort(0);
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|
}
|
2020-06-20 20:14:50 +00:00
|
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workers[i].sent = 0;
|
1994-05-26 06:35:07 +00:00
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}
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}
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close_rewind();
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|
|
rollforward();
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|
return;
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|
}
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|
}
|
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|
blks = 0;
|
2018-06-11 20:38:26 +00:00
|
|
|
if (spcl.c_type != TS_END && spcl.c_type != TS_CLRI &&
|
|
|
|
spcl.c_type != TS_BITS) {
|
2018-06-11 19:32:36 +00:00
|
|
|
assert(spcl.c_count <= TP_NINDIR);
|
1994-05-26 06:35:07 +00:00
|
|
|
for (i = 0; i < spcl.c_count; i++)
|
|
|
|
if (spcl.c_addr[i] != 0)
|
|
|
|
blks++;
|
|
|
|
}
|
2020-06-23 21:11:40 +00:00
|
|
|
wp->count = lastspclrec + blks + 1 - spcl.c_tapea;
|
|
|
|
wp->tapea = spcl.c_tapea;
|
|
|
|
wp->firstrec = lastfirstrec + ntrec;
|
|
|
|
wp->inode = curino;
|
|
|
|
nextblock = wp->tblock;
|
1994-05-26 06:35:07 +00:00
|
|
|
trecno = 0;
|
|
|
|
asize += tenths;
|
|
|
|
blockswritten += ntrec;
|
|
|
|
blocksthisvol += ntrec;
|
1997-02-01 23:44:19 +00:00
|
|
|
if (!pipeout && !unlimited && (blocksperfile ?
|
1994-05-26 06:35:07 +00:00
|
|
|
(blocksthisvol >= blocksperfile) : (asize > tsize))) {
|
|
|
|
close_rewind();
|
|
|
|
startnewtape(0);
|
|
|
|
}
|
|
|
|
timeest();
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
2002-03-20 22:49:40 +00:00
|
|
|
trewind(void)
|
1994-05-26 06:35:07 +00:00
|
|
|
{
|
2002-02-11 00:50:50 +00:00
|
|
|
struct stat sb;
|
1994-05-26 06:35:07 +00:00
|
|
|
int f;
|
|
|
|
int got;
|
|
|
|
|
2020-06-20 20:14:50 +00:00
|
|
|
for (f = 0; f < WORKERS; f++) {
|
1994-05-26 06:35:07 +00:00
|
|
|
/*
|
1995-05-30 06:12:45 +00:00
|
|
|
* Drain the results, but unlike EOT we DO (or should) care
|
|
|
|
* what the return values were, since if we detect EOT after
|
|
|
|
* we think we've written the last blocks to the tape anyway,
|
1994-05-26 06:35:07 +00:00
|
|
|
* we have to replay those blocks with rollforward.
|
|
|
|
*
|
1995-05-30 06:12:45 +00:00
|
|
|
* fixme: punt for now.
|
1994-05-26 06:35:07 +00:00
|
|
|
*/
|
2020-06-20 20:14:50 +00:00
|
|
|
if (workers[f].sent) {
|
2023-03-22 22:57:26 +00:00
|
|
|
if (atomic_read(workers[f].fd, (void *)&got, sizeof got)
|
1994-05-26 06:35:07 +00:00
|
|
|
!= sizeof got) {
|
|
|
|
perror(" DUMP: error reading command pipe in master");
|
|
|
|
dumpabort(0);
|
|
|
|
}
|
2020-06-20 20:14:50 +00:00
|
|
|
workers[f].sent = 0;
|
1994-05-26 06:35:07 +00:00
|
|
|
if (got != writesize) {
|
|
|
|
msg("EOT detected in last 2 tape records!\n");
|
|
|
|
msg("Use a longer tape, decrease the size estimate\n");
|
|
|
|
quit("or use no size estimate at all.\n");
|
|
|
|
}
|
|
|
|
}
|
2020-06-20 20:14:50 +00:00
|
|
|
(void) close(workers[f].fd);
|
1994-05-26 06:35:07 +00:00
|
|
|
}
|
2020-06-20 20:14:50 +00:00
|
|
|
while (wait((int *)NULL) >= 0) /* wait for any signals from workers */
|
1994-05-26 06:35:07 +00:00
|
|
|
/* void */;
|
|
|
|
|
|
|
|
if (pipeout)
|
|
|
|
return;
|
|
|
|
|
|
|
|
msg("Closing %s\n", tape);
|
|
|
|
|
2004-04-13 02:58:06 +00:00
|
|
|
if (popenout) {
|
|
|
|
tapefd = -1;
|
|
|
|
(void)pclose(popenfp);
|
|
|
|
popenfp = NULL;
|
|
|
|
return;
|
|
|
|
}
|
1994-05-26 06:35:07 +00:00
|
|
|
#ifdef RDUMP
|
|
|
|
if (host) {
|
|
|
|
rmtclose();
|
|
|
|
while (rmtopen(tape, 0) < 0)
|
|
|
|
sleep(10);
|
|
|
|
rmtclose();
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
#endif
|
2002-02-11 00:50:50 +00:00
|
|
|
if (fstat(tapefd, &sb) == 0 && S_ISFIFO(sb.st_mode)) {
|
|
|
|
(void)close(tapefd);
|
|
|
|
return;
|
|
|
|
}
|
1994-05-26 06:35:07 +00:00
|
|
|
(void) close(tapefd);
|
|
|
|
while ((f = open(tape, 0)) < 0)
|
|
|
|
sleep (10);
|
|
|
|
(void) close(f);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
close_rewind()
|
|
|
|
{
|
1997-10-12 14:09:13 +00:00
|
|
|
time_t tstart_changevol, tend_changevol;
|
|
|
|
|
1994-05-26 06:35:07 +00:00
|
|
|
trewind();
|
|
|
|
if (nexttape)
|
|
|
|
return;
|
1997-10-12 14:09:13 +00:00
|
|
|
(void)time((time_t *)&(tstart_changevol));
|
1994-05-26 06:35:07 +00:00
|
|
|
if (!nogripe) {
|
|
|
|
msg("Change Volumes: Mount volume #%d\n", tapeno+1);
|
2001-01-28 21:21:37 +00:00
|
|
|
broadcast("CHANGE DUMP VOLUMES!\a\a\n");
|
1994-05-26 06:35:07 +00:00
|
|
|
}
|
|
|
|
while (!query("Is the new volume mounted and ready to go?"))
|
|
|
|
if (query("Do you want to abort?")) {
|
|
|
|
dumpabort(0);
|
|
|
|
/*NOTREACHED*/
|
|
|
|
}
|
1997-10-12 14:09:13 +00:00
|
|
|
(void)time((time_t *)&(tend_changevol));
|
|
|
|
if ((tstart_changevol != (time_t)-1) && (tend_changevol != (time_t)-1))
|
|
|
|
tstart_writing += (tend_changevol - tstart_changevol);
|
1994-05-26 06:35:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
2002-03-20 22:49:40 +00:00
|
|
|
rollforward(void)
|
1994-05-26 06:35:07 +00:00
|
|
|
{
|
2001-11-17 00:06:55 +00:00
|
|
|
struct req *p, *q, *prev;
|
2020-06-23 21:11:40 +00:00
|
|
|
struct worker *twp;
|
2002-06-21 06:18:05 +00:00
|
|
|
int i, size, got;
|
|
|
|
int64_t savedtapea;
|
1994-05-26 06:35:07 +00:00
|
|
|
union u_spcl *ntb, *otb;
|
2020-06-23 21:11:40 +00:00
|
|
|
twp = &workers[WORKERS];
|
|
|
|
ntb = (union u_spcl *)twp->tblock[1];
|
1994-05-26 06:35:07 +00:00
|
|
|
|
|
|
|
/*
|
2020-06-20 20:14:50 +00:00
|
|
|
* Each of the N workers should have requests that need to
|
|
|
|
* be replayed on the next tape. Use the extra worker buffers
|
|
|
|
* (workers[WORKERS]) to construct request lists to be sent to
|
|
|
|
* each worker in turn.
|
1994-05-26 06:35:07 +00:00
|
|
|
*/
|
2020-06-20 20:14:50 +00:00
|
|
|
for (i = 0; i < WORKERS; i++) {
|
2020-06-23 21:11:40 +00:00
|
|
|
q = &twp->req[1];
|
|
|
|
otb = (union u_spcl *)wp->tblock;
|
1994-05-26 06:35:07 +00:00
|
|
|
|
|
|
|
/*
|
2020-06-23 21:11:40 +00:00
|
|
|
* For each request in the current worker, copy it to twp.
|
1994-05-26 06:35:07 +00:00
|
|
|
*/
|
|
|
|
|
|
|
|
prev = NULL;
|
2020-06-23 21:11:40 +00:00
|
|
|
for (p = wp->req; p->count > 0; p += p->count) {
|
1994-05-26 06:35:07 +00:00
|
|
|
*q = *p;
|
|
|
|
if (p->dblk == 0)
|
|
|
|
*ntb++ = *otb++; /* copy the datablock also */
|
|
|
|
prev = q;
|
|
|
|
q += q->count;
|
|
|
|
}
|
|
|
|
if (prev == NULL)
|
|
|
|
quit("rollforward: protocol botch");
|
|
|
|
if (prev->dblk != 0)
|
|
|
|
prev->count -= 1;
|
|
|
|
else
|
|
|
|
ntb--;
|
|
|
|
q -= 1;
|
|
|
|
q->count = 0;
|
2020-06-23 21:11:40 +00:00
|
|
|
q = &twp->req[0];
|
1994-05-26 06:35:07 +00:00
|
|
|
if (i == 0) {
|
|
|
|
q->dblk = 0;
|
|
|
|
q->count = 1;
|
|
|
|
trecno = 0;
|
2020-06-23 21:11:40 +00:00
|
|
|
nextblock = twp->tblock;
|
1994-05-26 06:35:07 +00:00
|
|
|
savedtapea = spcl.c_tapea;
|
2020-06-23 21:11:40 +00:00
|
|
|
spcl.c_tapea = wp->tapea;
|
1994-05-26 06:35:07 +00:00
|
|
|
startnewtape(0);
|
|
|
|
spcl.c_tapea = savedtapea;
|
|
|
|
lastspclrec = savedtapea - 1;
|
|
|
|
}
|
|
|
|
size = (char *)ntb - (char *)q;
|
2023-03-22 22:57:26 +00:00
|
|
|
if (atomic_write(wp->fd, (const void *)q, size) != size) {
|
1994-05-26 06:35:07 +00:00
|
|
|
perror(" DUMP: error writing command pipe");
|
|
|
|
dumpabort(0);
|
|
|
|
}
|
2020-06-23 21:11:40 +00:00
|
|
|
wp->sent = 1;
|
|
|
|
if (++wp >= &workers[WORKERS])
|
|
|
|
wp = &workers[0];
|
1994-05-26 06:35:07 +00:00
|
|
|
|
|
|
|
q->count = 1;
|
|
|
|
|
|
|
|
if (prev->dblk != 0) {
|
|
|
|
/*
|
1995-05-30 06:12:45 +00:00
|
|
|
* If the last one was a disk block, make the
|
|
|
|
* first of this one be the last bit of that disk
|
1994-05-26 06:35:07 +00:00
|
|
|
* block...
|
|
|
|
*/
|
|
|
|
q->dblk = prev->dblk +
|
|
|
|
prev->count * (TP_BSIZE / DEV_BSIZE);
|
2020-06-23 21:11:40 +00:00
|
|
|
ntb = (union u_spcl *)twp->tblock;
|
1994-05-26 06:35:07 +00:00
|
|
|
} else {
|
|
|
|
/*
|
1995-05-30 06:12:45 +00:00
|
|
|
* It wasn't a disk block. Copy the data to its
|
1994-05-26 06:35:07 +00:00
|
|
|
* new location in the buffer.
|
|
|
|
*/
|
|
|
|
q->dblk = 0;
|
2020-06-23 21:11:40 +00:00
|
|
|
*((union u_spcl *)twp->tblock) = *ntb;
|
|
|
|
ntb = (union u_spcl *)twp->tblock[1];
|
1994-05-26 06:35:07 +00:00
|
|
|
}
|
|
|
|
}
|
2020-06-23 21:11:40 +00:00
|
|
|
wp->req[0] = *q;
|
|
|
|
nextblock = wp->tblock;
|
1994-05-26 06:35:07 +00:00
|
|
|
if (q->dblk == 0)
|
|
|
|
nextblock++;
|
|
|
|
trecno = 1;
|
|
|
|
|
|
|
|
/*
|
2020-06-20 20:14:50 +00:00
|
|
|
* Clear the first workers' response. One hopes that it
|
1994-05-26 06:35:07 +00:00
|
|
|
* worked ok, otherwise the tape is much too short!
|
|
|
|
*/
|
2020-06-23 21:11:40 +00:00
|
|
|
if (wp->sent) {
|
2023-03-22 22:57:26 +00:00
|
|
|
if (atomic_read(wp->fd, (void *)&got, sizeof got)
|
1994-05-26 06:35:07 +00:00
|
|
|
!= sizeof got) {
|
|
|
|
perror(" DUMP: error reading command pipe in master");
|
|
|
|
dumpabort(0);
|
|
|
|
}
|
2020-06-23 21:11:40 +00:00
|
|
|
wp->sent = 0;
|
1994-05-26 06:35:07 +00:00
|
|
|
|
|
|
|
if (got != writesize) {
|
|
|
|
quit("EOT detected at start of the tape!\n");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We implement taking and restoring checkpoints on the tape level.
|
|
|
|
* When each tape is opened, a new process is created by forking; this
|
|
|
|
* saves all of the necessary context in the parent. The child
|
|
|
|
* continues the dump; the parent waits around, saving the context.
|
|
|
|
* If the child returns X_REWRITE, then it had problems writing that tape;
|
|
|
|
* this causes the parent to fork again, duplicating the context, and
|
|
|
|
* everything continues as if nothing had happened.
|
|
|
|
*/
|
|
|
|
void
|
2002-03-20 22:49:40 +00:00
|
|
|
startnewtape(int top)
|
1994-05-26 06:35:07 +00:00
|
|
|
{
|
|
|
|
int parentpid;
|
|
|
|
int childpid;
|
|
|
|
int status;
|
|
|
|
char *p;
|
|
|
|
sig_t interrupt_save;
|
|
|
|
|
|
|
|
interrupt_save = signal(SIGINT, SIG_IGN);
|
|
|
|
parentpid = getpid();
|
|
|
|
|
|
|
|
restore_check_point:
|
|
|
|
(void)signal(SIGINT, interrupt_save);
|
|
|
|
/*
|
|
|
|
* All signals are inherited...
|
|
|
|
*/
|
2002-02-16 21:05:16 +00:00
|
|
|
setproctitle(NULL); /* Restore the proctitle. */
|
1994-05-26 06:35:07 +00:00
|
|
|
childpid = fork();
|
|
|
|
if (childpid < 0) {
|
|
|
|
msg("Context save fork fails in parent %d\n", parentpid);
|
|
|
|
Exit(X_ABORT);
|
|
|
|
}
|
|
|
|
if (childpid != 0) {
|
|
|
|
/*
|
|
|
|
* PARENT:
|
|
|
|
* save the context by waiting
|
|
|
|
* until the child doing all of the work returns.
|
|
|
|
* don't catch the interrupt
|
|
|
|
*/
|
|
|
|
signal(SIGINT, SIG_IGN);
|
|
|
|
#ifdef TDEBUG
|
|
|
|
msg("Tape: %d; parent process: %d child process %d\n",
|
|
|
|
tapeno+1, parentpid, childpid);
|
|
|
|
#endif /* TDEBUG */
|
2004-04-13 02:58:06 +00:00
|
|
|
if (waitpid(childpid, &status, 0) == -1)
|
|
|
|
msg("Waiting for child %d: %s\n", childpid,
|
|
|
|
strerror(errno));
|
1994-05-26 06:35:07 +00:00
|
|
|
if (status & 0xFF) {
|
|
|
|
msg("Child %d returns LOB status %o\n",
|
|
|
|
childpid, status&0xFF);
|
|
|
|
}
|
|
|
|
status = (status >> 8) & 0xFF;
|
|
|
|
#ifdef TDEBUG
|
|
|
|
switch(status) {
|
|
|
|
case X_FINOK:
|
|
|
|
msg("Child %d finishes X_FINOK\n", childpid);
|
|
|
|
break;
|
1995-05-30 06:12:45 +00:00
|
|
|
case X_ABORT:
|
1994-05-26 06:35:07 +00:00
|
|
|
msg("Child %d finishes X_ABORT\n", childpid);
|
|
|
|
break;
|
|
|
|
case X_REWRITE:
|
|
|
|
msg("Child %d finishes X_REWRITE\n", childpid);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
msg("Child %d finishes unknown %d\n",
|
|
|
|
childpid, status);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
#endif /* TDEBUG */
|
|
|
|
switch(status) {
|
|
|
|
case X_FINOK:
|
|
|
|
Exit(X_FINOK);
|
|
|
|
case X_ABORT:
|
|
|
|
Exit(X_ABORT);
|
|
|
|
case X_REWRITE:
|
|
|
|
goto restore_check_point;
|
|
|
|
default:
|
|
|
|
msg("Bad return code from dump: %d\n", status);
|
|
|
|
Exit(X_ABORT);
|
|
|
|
}
|
|
|
|
/*NOTREACHED*/
|
|
|
|
} else { /* we are the child; just continue */
|
|
|
|
#ifdef TDEBUG
|
|
|
|
sleep(4); /* allow time for parent's message to get out */
|
|
|
|
msg("Child on Tape %d has parent %d, my pid = %d\n",
|
|
|
|
tapeno+1, parentpid, getpid());
|
|
|
|
#endif /* TDEBUG */
|
|
|
|
/*
|
|
|
|
* If we have a name like "/dev/rmt0,/dev/rmt1",
|
|
|
|
* use the name before the comma first, and save
|
|
|
|
* the remaining names for subsequent volumes.
|
|
|
|
*/
|
|
|
|
tapeno++; /* current tape sequence */
|
1997-03-11 12:09:50 +00:00
|
|
|
if (nexttape || strchr(tape, ',')) {
|
1994-05-26 06:35:07 +00:00
|
|
|
if (nexttape && *nexttape)
|
|
|
|
tape = nexttape;
|
1997-03-11 12:09:50 +00:00
|
|
|
if ((p = strchr(tape, ',')) != NULL) {
|
1994-05-26 06:35:07 +00:00
|
|
|
*p = '\0';
|
|
|
|
nexttape = p + 1;
|
|
|
|
} else
|
|
|
|
nexttape = NULL;
|
|
|
|
msg("Dumping volume %d on %s\n", tapeno, tape);
|
|
|
|
}
|
2004-04-13 02:58:06 +00:00
|
|
|
if (pipeout) {
|
|
|
|
tapefd = STDOUT_FILENO;
|
|
|
|
} else if (popenout) {
|
|
|
|
char volno[sizeof("2147483647")];
|
|
|
|
|
|
|
|
(void)sprintf(volno, "%d", spcl.c_volume + 1);
|
|
|
|
if (setenv("DUMP_VOLUME", volno, 1) == -1) {
|
|
|
|
msg("Cannot set $DUMP_VOLUME.\n");
|
|
|
|
dumpabort(0);
|
|
|
|
}
|
|
|
|
popenfp = popen(popenout, "w");
|
|
|
|
if (popenfp == NULL) {
|
|
|
|
msg("Cannot open output pipeline \"%s\".\n",
|
|
|
|
popenout);
|
|
|
|
dumpabort(0);
|
|
|
|
}
|
|
|
|
tapefd = fileno(popenfp);
|
|
|
|
} else {
|
1994-05-26 06:35:07 +00:00
|
|
|
#ifdef RDUMP
|
2004-04-13 02:58:06 +00:00
|
|
|
while ((tapefd = (host ? rmtopen(tape, 2) :
|
|
|
|
open(tape, O_WRONLY|O_CREAT, 0666))) < 0)
|
1994-05-26 06:35:07 +00:00
|
|
|
#else
|
2004-04-13 02:58:06 +00:00
|
|
|
while ((tapefd =
|
|
|
|
open(tape, O_WRONLY|O_CREAT, 0666)) < 0)
|
1994-05-26 06:35:07 +00:00
|
|
|
#endif
|
2004-04-13 02:58:06 +00:00
|
|
|
{
|
|
|
|
msg("Cannot open output \"%s\".\n", tape);
|
|
|
|
if (!query("Do you want to retry the open?"))
|
|
|
|
dumpabort(0);
|
|
|
|
}
|
1994-05-26 06:35:07 +00:00
|
|
|
}
|
|
|
|
|
2020-06-23 21:11:40 +00:00
|
|
|
create_workers(); /* Share open tape file descriptor with workers */
|
2004-04-13 02:58:06 +00:00
|
|
|
if (popenout)
|
|
|
|
close(tapefd); /* Give up our copy of it. */
|
2002-02-16 20:22:26 +00:00
|
|
|
signal(SIGINFO, infosch);
|
1994-05-26 06:35:07 +00:00
|
|
|
|
|
|
|
asize = 0;
|
|
|
|
blocksthisvol = 0;
|
|
|
|
if (top)
|
|
|
|
newtape++; /* new tape signal */
|
2020-06-23 21:11:40 +00:00
|
|
|
spcl.c_count = wp->count;
|
1994-05-26 06:35:07 +00:00
|
|
|
/*
|
|
|
|
* measure firstrec in TP_BSIZE units since restore doesn't
|
|
|
|
* know the correct ntrec value...
|
|
|
|
*/
|
2020-06-23 21:11:40 +00:00
|
|
|
spcl.c_firstrec = wp->firstrec;
|
1994-05-26 06:35:07 +00:00
|
|
|
spcl.c_volume++;
|
|
|
|
spcl.c_type = TS_TAPE;
|
2020-06-23 21:11:40 +00:00
|
|
|
writeheader((ino_t)wp->inode);
|
1994-05-26 06:35:07 +00:00
|
|
|
if (tapeno > 1)
|
|
|
|
msg("Volume %d begins with blocks from inode %d\n",
|
2020-06-23 21:11:40 +00:00
|
|
|
tapeno, wp->inode);
|
1994-05-26 06:35:07 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
2002-03-20 22:49:40 +00:00
|
|
|
dumpabort(int signo __unused)
|
1994-05-26 06:35:07 +00:00
|
|
|
{
|
|
|
|
|
|
|
|
if (master != 0 && master != getpid())
|
|
|
|
/* Signals master to call dumpabort */
|
|
|
|
(void) kill(master, SIGTERM);
|
|
|
|
else {
|
|
|
|
killall();
|
|
|
|
msg("The ENTIRE dump is aborted.\n");
|
|
|
|
}
|
|
|
|
#ifdef RDUMP
|
|
|
|
rmtclose();
|
|
|
|
#endif
|
|
|
|
Exit(X_ABORT);
|
|
|
|
}
|
|
|
|
|
1996-09-14 03:00:32 +00:00
|
|
|
void
|
2023-03-22 22:57:26 +00:00
|
|
|
Exit(int status)
|
1994-05-26 06:35:07 +00:00
|
|
|
{
|
|
|
|
|
|
|
|
#ifdef TDEBUG
|
|
|
|
msg("pid = %d exits with status %d\n", getpid(), status);
|
|
|
|
#endif /* TDEBUG */
|
|
|
|
exit(status);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2020-06-20 20:14:50 +00:00
|
|
|
* proceed - handler for SIGUSR2, used to synchronize IO between the workers.
|
1994-05-26 06:35:07 +00:00
|
|
|
*/
|
|
|
|
void
|
2002-03-20 22:49:40 +00:00
|
|
|
proceed(int signo __unused)
|
1994-05-26 06:35:07 +00:00
|
|
|
{
|
|
|
|
|
|
|
|
if (ready)
|
|
|
|
longjmp(jmpbuf, 1);
|
|
|
|
caught++;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
2020-06-23 21:11:40 +00:00
|
|
|
create_workers(void)
|
1994-05-26 06:35:07 +00:00
|
|
|
{
|
|
|
|
int cmd[2];
|
2001-11-17 00:06:55 +00:00
|
|
|
int i, j;
|
1994-05-26 06:35:07 +00:00
|
|
|
|
|
|
|
master = getpid();
|
|
|
|
|
2020-06-20 20:14:50 +00:00
|
|
|
signal(SIGTERM, dumpabort); /* Worker sends SIGTERM on dumpabort() */
|
1994-05-26 06:35:07 +00:00
|
|
|
signal(SIGPIPE, sigpipe);
|
2020-06-20 20:14:50 +00:00
|
|
|
signal(SIGUSR1, tperror); /* Worker sends SIGUSR1 on tape errors */
|
|
|
|
signal(SIGUSR2, proceed); /* Worker sends SIGUSR2 to next worker */
|
1994-05-26 06:35:07 +00:00
|
|
|
|
2020-06-20 20:14:50 +00:00
|
|
|
for (i = 0; i < WORKERS; i++) {
|
2020-06-23 21:11:40 +00:00
|
|
|
if (i == wp - &workers[0]) {
|
1994-05-26 06:35:07 +00:00
|
|
|
caught = 1;
|
|
|
|
} else {
|
|
|
|
caught = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (socketpair(AF_UNIX, SOCK_STREAM, 0, cmd) < 0 ||
|
2020-06-20 20:14:50 +00:00
|
|
|
(workers[i].pid = fork()) < 0)
|
|
|
|
quit("too many workers, %d (recompile smaller): %s\n",
|
1994-05-26 06:35:07 +00:00
|
|
|
i, strerror(errno));
|
|
|
|
|
2020-06-20 20:14:50 +00:00
|
|
|
workers[i].fd = cmd[1];
|
|
|
|
workers[i].sent = 0;
|
|
|
|
if (workers[i].pid == 0) { /* Worker starts up here */
|
1994-05-26 06:35:07 +00:00
|
|
|
for (j = 0; j <= i; j++)
|
2020-06-20 20:14:50 +00:00
|
|
|
(void) close(workers[j].fd);
|
1994-05-26 06:35:07 +00:00
|
|
|
signal(SIGINT, SIG_IGN); /* Master handles this */
|
2020-06-20 20:14:50 +00:00
|
|
|
worker(cmd[0], i);
|
1994-05-26 06:35:07 +00:00
|
|
|
Exit(X_FINOK);
|
|
|
|
}
|
|
|
|
}
|
1995-05-30 06:12:45 +00:00
|
|
|
|
2020-06-20 20:14:50 +00:00
|
|
|
for (i = 0; i < WORKERS; i++)
|
2023-03-22 22:57:26 +00:00
|
|
|
(void) atomic_write(workers[i].fd,
|
|
|
|
(const void *) &workers[(i + 1) % WORKERS].pid,
|
2020-06-20 20:14:50 +00:00
|
|
|
sizeof workers[0].pid);
|
1995-05-30 06:12:45 +00:00
|
|
|
|
|
|
|
master = 0;
|
1994-05-26 06:35:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
2002-03-20 22:49:40 +00:00
|
|
|
killall(void)
|
1994-05-26 06:35:07 +00:00
|
|
|
{
|
2001-11-17 00:06:55 +00:00
|
|
|
int i;
|
1994-05-26 06:35:07 +00:00
|
|
|
|
2020-06-20 20:14:50 +00:00
|
|
|
for (i = 0; i < WORKERS; i++)
|
|
|
|
if (workers[i].pid > 0) {
|
|
|
|
(void) kill(workers[i].pid, SIGKILL);
|
|
|
|
workers[i].sent = 0;
|
1997-05-06 20:52:28 +00:00
|
|
|
}
|
1994-05-26 06:35:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Synchronization - each process has a lockfile, and shares file
|
|
|
|
* descriptors to the following process's lockfile. When our write
|
|
|
|
* completes, we release our lock on the following process's lock-
|
|
|
|
* file, allowing the following process to lock it and proceed. We
|
|
|
|
* get the lock back for the next cycle by swapping descriptors.
|
|
|
|
*/
|
|
|
|
static void
|
2020-06-20 20:14:50 +00:00
|
|
|
worker(int cmd, int worker_number)
|
1994-05-26 06:35:07 +00:00
|
|
|
{
|
2001-11-17 00:06:55 +00:00
|
|
|
int nread;
|
2020-06-20 20:14:50 +00:00
|
|
|
int nextworker, size, wrote, eot_count;
|
1994-05-26 06:35:07 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Need our own seek pointer.
|
|
|
|
*/
|
|
|
|
(void) close(diskfd);
|
|
|
|
if ((diskfd = open(disk, O_RDONLY)) < 0)
|
2020-06-20 20:14:50 +00:00
|
|
|
quit("worker couldn't reopen disk: %s\n", strerror(errno));
|
1994-05-26 06:35:07 +00:00
|
|
|
|
|
|
|
/*
|
2020-06-20 20:14:50 +00:00
|
|
|
* Need the pid of the next worker in the loop...
|
1994-05-26 06:35:07 +00:00
|
|
|
*/
|
2023-03-22 22:57:26 +00:00
|
|
|
if ((nread = atomic_read(cmd, (void *)&nextworker, sizeof nextworker))
|
2020-06-20 20:14:50 +00:00
|
|
|
!= sizeof nextworker) {
|
|
|
|
quit("master/worker protocol botched - didn't get pid of next worker.\n");
|
1994-05-26 06:35:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Get list of blocks to dump, read the blocks into tape buffer
|
|
|
|
*/
|
2023-03-22 22:57:26 +00:00
|
|
|
while ((nread = atomic_read(cmd, (void *)wp->req, reqsiz)) == reqsiz) {
|
2020-06-23 21:11:40 +00:00
|
|
|
struct req *p = wp->req;
|
1994-05-26 06:35:07 +00:00
|
|
|
|
|
|
|
for (trecno = 0; trecno < ntrec;
|
|
|
|
trecno += p->count, p += p->count) {
|
|
|
|
if (p->dblk) {
|
2020-06-23 21:11:40 +00:00
|
|
|
blkread(p->dblk, wp->tblock[trecno],
|
1994-05-26 06:35:07 +00:00
|
|
|
p->count * TP_BSIZE);
|
|
|
|
} else {
|
2023-03-22 22:57:26 +00:00
|
|
|
if (p->count != 1 || atomic_read(cmd,
|
|
|
|
(void *)wp->tblock[trecno],
|
1994-05-26 06:35:07 +00:00
|
|
|
TP_BSIZE) != TP_BSIZE)
|
2020-06-20 20:14:50 +00:00
|
|
|
quit("master/worker protocol botched.\n");
|
1994-05-26 06:35:07 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
if (setjmp(jmpbuf) == 0) {
|
|
|
|
ready = 1;
|
|
|
|
if (!caught)
|
|
|
|
(void) pause();
|
|
|
|
}
|
|
|
|
ready = 0;
|
|
|
|
caught = 0;
|
|
|
|
|
|
|
|
/* Try to write the data... */
|
|
|
|
eot_count = 0;
|
|
|
|
size = 0;
|
|
|
|
|
2002-07-08 00:29:23 +00:00
|
|
|
wrote = 0;
|
1994-05-26 06:35:07 +00:00
|
|
|
while (eot_count < 10 && size < writesize) {
|
|
|
|
#ifdef RDUMP
|
|
|
|
if (host)
|
2020-06-23 21:11:40 +00:00
|
|
|
wrote = rmtwrite(wp->tblock[0]+size,
|
1994-05-26 06:35:07 +00:00
|
|
|
writesize-size);
|
|
|
|
else
|
|
|
|
#endif
|
2020-06-23 21:11:40 +00:00
|
|
|
wrote = write(tapefd, wp->tblock[0]+size,
|
1994-05-26 06:35:07 +00:00
|
|
|
writesize-size);
|
|
|
|
#ifdef WRITEDEBUG
|
2020-06-20 20:14:50 +00:00
|
|
|
printf("worker %d wrote %d\n", worker_number, wrote);
|
1994-05-26 06:35:07 +00:00
|
|
|
#endif
|
1995-05-30 06:12:45 +00:00
|
|
|
if (wrote < 0)
|
1994-05-26 06:35:07 +00:00
|
|
|
break;
|
|
|
|
if (wrote == 0)
|
|
|
|
eot_count++;
|
|
|
|
size += wrote;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef WRITEDEBUG
|
1995-05-30 06:12:45 +00:00
|
|
|
if (size != writesize)
|
2020-06-20 20:14:50 +00:00
|
|
|
printf("worker %d only wrote %d out of %d bytes and gave up.\n",
|
|
|
|
worker_number, size, writesize);
|
1994-05-26 06:35:07 +00:00
|
|
|
#endif
|
|
|
|
|
1998-09-15 10:25:50 +00:00
|
|
|
/*
|
|
|
|
* Handle ENOSPC as an EOT condition.
|
|
|
|
*/
|
|
|
|
if (wrote < 0 && errno == ENOSPC) {
|
|
|
|
wrote = 0;
|
|
|
|
eot_count++;
|
|
|
|
}
|
|
|
|
|
1994-05-26 06:35:07 +00:00
|
|
|
if (eot_count > 0)
|
|
|
|
size = 0;
|
|
|
|
|
1997-05-06 20:52:28 +00:00
|
|
|
if (wrote < 0) {
|
1994-05-26 06:35:07 +00:00
|
|
|
(void) kill(master, SIGUSR1);
|
|
|
|
for (;;)
|
|
|
|
(void) sigpause(0);
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* pass size of write back to master
|
|
|
|
* (for EOT handling)
|
|
|
|
*/
|
2023-03-22 22:57:26 +00:00
|
|
|
(void)atomic_write(cmd, (const void *)&size,
|
|
|
|
sizeof size);
|
1995-05-30 06:12:45 +00:00
|
|
|
}
|
1994-05-26 06:35:07 +00:00
|
|
|
|
|
|
|
/*
|
2020-06-20 20:14:50 +00:00
|
|
|
* If partial write, don't want next worker to go.
|
1994-05-26 06:35:07 +00:00
|
|
|
* Also jolts him awake.
|
|
|
|
*/
|
2020-06-20 20:14:50 +00:00
|
|
|
(void) kill(nextworker, SIGUSR2);
|
1994-05-26 06:35:07 +00:00
|
|
|
}
|
|
|
|
if (nread != 0)
|
|
|
|
quit("error reading command pipe: %s\n", strerror(errno));
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Since a read from a pipe may not return all we asked for,
|
|
|
|
* loop until the count is satisfied (or error).
|
|
|
|
*/
|
|
|
|
static int
|
2023-03-22 22:57:26 +00:00
|
|
|
atomic_read(int fd, void *buf, int count)
|
1994-05-26 06:35:07 +00:00
|
|
|
{
|
|
|
|
int got, need = count;
|
|
|
|
|
2023-03-22 22:57:26 +00:00
|
|
|
while ((got = read(fd, buf, need)) > 0 && (need -= got) > 0)
|
|
|
|
buf += got;
|
|
|
|
return (got < 0 ? got : count - need);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Since a write to a pipe may not write all we ask if we get a signal,
|
|
|
|
* loop until the count is satisfied (or error).
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
atomic_write(int fd, const void *buf, int count)
|
|
|
|
{
|
|
|
|
int got, need = count;
|
|
|
|
|
|
|
|
while ((got = write(fd, buf, need)) > 0 && (need -= got) > 0)
|
1994-05-26 06:35:07 +00:00
|
|
|
buf += got;
|
|
|
|
return (got < 0 ? got : count - need);
|
|
|
|
}
|