653 lines
13 KiB
C
653 lines
13 KiB
C
/* Remote tape emulator subroutines.
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Copyright (C) 1988 Free Software Foundation
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This file is part of GNU Tar.
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GNU Tar is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GNU Tar is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Tar; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* JF: modified to make all rmtXXX calls into macros for speed */
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#ifndef lint
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static char *RCSid = "$Header: /cvsroot/src/gnu/usr.bin/tar/Attic/rtape_lib.c,v 1.1.1.1 1993/03/21 09:45:37 cgd Exp $";
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#endif
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/*
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* $Log: rtape_lib.c,v $
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* Revision 1.1.1.1 1993/03/21 09:45:37 cgd
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* initial import of 386bsd-0.1 sources
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*
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* Revision 1.7 89/03/23 14:09:51 root
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* Fix from haynes@ucscc.ucsc.edu for use w/compat. ADR.
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*
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* Revision 1.6 88/10/25 17:04:29 root
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* rexec code and a bug fix from srs!dan, miscellanious cleanup. ADR.
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*
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* Revision 1.5 88/10/25 16:30:17 root
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* Fix from jeff@gatech.edu for getting user@host:dev right. ADR.
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*
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* Revision 1.4 87/10/30 10:36:12 root
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* Made 4.2 syntax a compile time option. ADR.
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*
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* Revision 1.3 87/04/22 11:16:48 root
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* Two fixes from parmelee@wayback.cs.cornell.edu to correctly
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* do fd biasing and rmt protocol on 'S' command. ADR.
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*
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* Revision 1.2 86/10/09 16:38:53 root
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* Changed to reflect 4.3BSD rcp syntax. ADR.
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*
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* Revision 1.1 86/10/09 16:17:35 root
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* Initial revision
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*
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*/
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/*
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* rmt --- remote tape emulator subroutines
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*
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* Originally written by Jeff Lee, modified some by Arnold Robbins
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*
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* WARNING: The man page rmt(8) for /etc/rmt documents the remote mag
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* tape protocol which rdump and rrestore use. Unfortunately, the man
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* page is *WRONG*. The author of the routines I'm including originally
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* wrote his code just based on the man page, and it didn't work, so he
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* went to the rdump source to figure out why. The only thing he had to
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* change was to check for the 'F' return code in addition to the 'E',
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* and to separate the various arguments with \n instead of a space. I
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* personally don't think that this is much of a problem, but I wanted to
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* point it out.
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* -- Arnold Robbins
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*
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* Redone as a library that can replace open, read, write, etc, by
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* Fred Fish, with some additional work by Arnold Robbins.
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*/
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/* Use -DUSE_REXEC for rexec code, courtesy of Dan Kegel, srs!dan */
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#if defined(USG) && !defined(HAVE_MTIO)
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#define NO_RMTIOCTL
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#endif
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#include <stdio.h>
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#include <signal.h>
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#include <sys/types.h>
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#ifndef NO_RMTIOCTL
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#include <sys/ioctl.h>
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#include <sys/mtio.h>
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#endif
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#ifdef USE_REXEC
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#include <netdb.h>
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#endif
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#include <errno.h>
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#include <setjmp.h>
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#include <sys/stat.h>
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#define BUFMAGIC 64 /* a magic number for buffer sizes */
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/*
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* MAXUNIT --- Maximum number of remote tape file units
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*/
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#define MAXUNIT 4
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/*
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* READ --- Return the number of the read side file descriptor
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* WRITE --- Return the number of the write side file descriptor
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*/
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#define READ(fd) (Ctp[fd][0])
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#define WRITE(fd) (Ptc[fd][1])
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static int Ctp[MAXUNIT][2] = { -1, -1, -1, -1, -1, -1, -1, -1 };
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static int Ptc[MAXUNIT][2] = { -1, -1, -1, -1, -1, -1, -1, -1 };
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extern int errno;
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char *__rmt_path;
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/*
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* _rmt_panic --- close off a remote tape connection
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*/
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static void _rmt_panic(fildes)
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int fildes;
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{
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close(READ(fildes));
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close(WRITE(fildes));
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READ(fildes) = -1;
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WRITE(fildes) = -1;
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}
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/*
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* command --- attempt to perform a remote tape command
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*/
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static int command(fildes, buf)
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int fildes;
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char *buf;
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{
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register int blen;
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#ifdef SIGNAL_VOID
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void (*pstat)();
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#else
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int (*pstat)();
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#endif
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/*
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* save current pipe status and try to make the request
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*/
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blen = strlen(buf);
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pstat = signal(SIGPIPE, SIG_IGN);
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if (write(WRITE(fildes), buf, blen) == blen)
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{
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signal(SIGPIPE, pstat);
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return(0);
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}
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/*
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* something went wrong. close down and go home
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*/
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signal(SIGPIPE, pstat);
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_rmt_panic(fildes);
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errno = EIO;
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return(-1);
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}
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/*
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* status --- retrieve the status from the pipe
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*/
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static int status(fildes)
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int fildes;
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{
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int i;
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char c, *cp;
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char buffer[BUFMAGIC];
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/*
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* read the reply command line
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*/
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for (i = 0, cp = buffer; i < BUFMAGIC; i++, cp++)
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{
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if (read(READ(fildes), cp, 1) != 1)
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{
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_rmt_panic(fildes);
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errno = EIO;
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return(-1);
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}
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if (*cp == '\n')
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{
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*cp = 0;
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break;
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}
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}
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if (i == BUFMAGIC)
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{
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_rmt_panic(fildes);
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errno = EIO;
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return(-1);
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}
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/*
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* check the return status
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*/
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for (cp = buffer; *cp; cp++)
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if (*cp != ' ')
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break;
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if (*cp == 'E' || *cp == 'F')
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{
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errno = atoi(cp + 1);
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while (read(READ(fildes), &c, 1) == 1)
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if (c == '\n')
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break;
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if (*cp == 'F')
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_rmt_panic(fildes);
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return(-1);
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}
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/*
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* check for mis-synced pipes
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*/
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if (*cp != 'A')
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{
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_rmt_panic(fildes);
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errno = EIO;
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return(-1);
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}
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return(atoi(cp + 1));
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}
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#ifdef USE_REXEC
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/*
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* _rmt_rexec
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*
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* execute /etc/rmt on a remote system using rexec().
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* Return file descriptor of bidirectional socket for stdin and stdout
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* If username is NULL, or an empty string, uses current username.
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*
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* ADR: By default, this code is not used, since it requires that
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* the user have a .netrc file in his/her home directory, or that the
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* application designer be willing to have rexec prompt for login and
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* password info. This may be unacceptable, and .rhosts files for use
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* with rsh are much more common on BSD systems.
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*/
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static int
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_rmt_rexec(host, user)
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char *host;
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char *user; /* may be NULL */
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{
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struct servent *rexecserv;
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int save_stdin = dup(fileno(stdin));
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int save_stdout = dup(fileno(stdout));
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int tape_fd; /* Return value. */
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/*
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* When using cpio -o < filename, stdin is no longer the tty.
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* But the rexec subroutine reads the login and the passwd on stdin,
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* to allow remote execution of the command.
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* So, reopen stdin and stdout on /dev/tty before the rexec and
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* give them back their original value after.
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*/
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if (freopen("/dev/tty", "r", stdin) == NULL)
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freopen("/dev/null", "r", stdin);
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if (freopen("/dev/tty", "w", stdout) == NULL)
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freopen("/dev/null", "w", stdout);
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rexecserv = getservbyname("exec", "tcp");
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if (NULL == rexecserv) {
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fprintf (stderr, "? exec/tcp: service not available.");
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exit (-1);
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}
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if ((user != NULL) && *user == '\0')
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user = (char *) NULL;
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tape_fd = rexec (&host, rexecserv->s_port, user, NULL,
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"/etc/rmt", (int *)NULL);
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fclose(stdin);
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fdopen(save_stdin, "r");
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fclose(stdout);
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fdopen(save_stdout, "w");
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return tape_fd;
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}
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#endif /* USE_REXEC */
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/*
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* _rmt_open --- open a magtape device on system specified, as given user
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*
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* file name has the form [user@]system:/dev/????
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#ifdef COMPAT
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* file name has the form system[.user]:/dev/????
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#endif
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*/
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#define MAXHOSTLEN 257 /* BSD allows very long host names... */
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int __rmt_open (path, oflag, mode, bias)
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char *path;
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int oflag;
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int mode;
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int bias;
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{
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int i, rc;
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char buffer[BUFMAGIC];
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char system[MAXHOSTLEN];
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char device[BUFMAGIC];
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char login[BUFMAGIC];
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char *sys, *dev, *user;
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sys = system;
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dev = device;
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user = login;
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/*
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* first, find an open pair of file descriptors
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*/
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for (i = 0; i < MAXUNIT; i++)
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if (READ(i) == -1 && WRITE(i) == -1)
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break;
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if (i == MAXUNIT)
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{
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errno = EMFILE;
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return(-1);
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}
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/*
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* pull apart system and device, and optional user
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* don't munge original string
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* if COMPAT is defined, also handle old (4.2) style person.site notation.
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*/
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while (*path != '@'
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#ifdef COMPAT
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&& *path != '.'
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#endif
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&& *path != ':') {
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*sys++ = *path++;
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}
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*sys = '\0';
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path++;
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if (*(path - 1) == '@')
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{
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(void) strcpy (user, system); /* saw user part of user@host */
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sys = system; /* start over */
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while (*path != ':') {
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*sys++ = *path++;
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}
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*sys = '\0';
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path++;
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}
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#ifdef COMPAT
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else if (*(path - 1) == '.')
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{
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while (*path != ':') {
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*user++ = *path++;
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}
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*user = '\0';
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path++;
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}
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#endif
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else
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*user = '\0';
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while (*path) {
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*dev++ = *path++;
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}
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*dev = '\0';
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#ifdef USE_REXEC
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/*
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* Execute the remote command using rexec
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*/
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READ(i) = WRITE(i) = _rmt_rexec(system, login);
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if (READ(i) < 0)
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return -1;
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#else
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/*
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* setup the pipes for the 'rsh' command and fork
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*/
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if (pipe(Ptc[i]) == -1 || pipe(Ctp[i]) == -1)
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return(-1);
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if ((rc = fork()) == -1)
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return(-1);
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if (rc == 0)
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{
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close(0);
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dup(Ptc[i][0]);
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close(Ptc[i][0]); close(Ptc[i][1]);
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close(1);
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dup(Ctp[i][1]);
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close(Ctp[i][0]); close(Ctp[i][1]);
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(void) setuid (getuid ());
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(void) setgid (getgid ());
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if (*login)
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{
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execl("/usr/ucb/rsh", "rsh", system, "-l", login,
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"/etc/rmt", (char *) 0);
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execl("/usr/bin/remsh", "remsh", system, "-l", login,
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"/etc/rmt", (char *) 0);
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execl("/usr/bin/rsh", "rsh", system, "-l", login,
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"/etc/rmt", (char *) 0);
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execl("/usr/bsd/rsh", "rsh", system, "-l", login,
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"/etc/rmt", (char *)0);
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execl("/usr/bin/nsh", "nsh", system, "-l", login,
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"/etc/rmt", (char *)0);
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}
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else
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{
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execl("/usr/ucb/rsh", "rsh", system,
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"/etc/rmt", (char *) 0);
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execl("/usr/bin/remsh", "remsh", system,
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"/etc/rmt", (char *) 0);
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execl("/usr/bin/rsh", "rsh", system,
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"/etc/rmt", (char *) 0);
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execl("/usr/bsd/rsh", "rsh", system,
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"/etc/rmt", (char *) 0);
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execl("/usr/bin/nsh", "nsh", system,
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"/etc/rmt", (char *)0);
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}
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/*
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* bad problems if we get here
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*/
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perror("remote shell exec");
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exit(1);
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}
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close(Ptc[i][0]); close(Ctp[i][1]);
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#endif
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/*
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* now attempt to open the tape device
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*/
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sprintf(buffer, "O%s\n%d\n", device, oflag);
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if (command(i, buffer) == -1 || status(i) == -1)
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return(-1);
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return(i+bias);
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}
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/*
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* _rmt_close --- close a remote magtape unit and shut down
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*/
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int __rmt_close(fildes)
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int fildes;
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{
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int rc;
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if (command(fildes, "C\n") != -1)
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{
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rc = status(fildes);
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_rmt_panic(fildes);
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return(rc);
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}
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return(-1);
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}
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/*
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* _rmt_read --- read a buffer from a remote tape
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*/
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int __rmt_read(fildes, buf, nbyte)
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int fildes;
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char *buf;
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unsigned int nbyte;
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{
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int rc, i;
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char buffer[BUFMAGIC];
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sprintf(buffer, "R%d\n", nbyte);
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if (command(fildes, buffer) == -1 || (rc = status(fildes)) == -1)
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return(-1);
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for (i = 0; i < rc; i += nbyte, buf += nbyte)
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{
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nbyte = read(READ(fildes), buf, rc);
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if (nbyte <= 0)
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{
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_rmt_panic(fildes);
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errno = EIO;
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return(-1);
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}
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}
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return(rc);
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}
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/*
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* _rmt_write --- write a buffer to the remote tape
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*/
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int __rmt_write(fildes, buf, nbyte)
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int fildes;
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char *buf;
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unsigned int nbyte;
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{
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char buffer[BUFMAGIC];
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#ifdef SIGNAL_VOID
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void (*pstat)();
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#else
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int (*pstat)();
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#endif
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sprintf(buffer, "W%d\n", nbyte);
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if (command(fildes, buffer) == -1)
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return(-1);
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pstat = signal(SIGPIPE, SIG_IGN);
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if (write(WRITE(fildes), buf, nbyte) == nbyte)
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{
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signal (SIGPIPE, pstat);
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return(status(fildes));
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}
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signal (SIGPIPE, pstat);
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_rmt_panic(fildes);
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errno = EIO;
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return(-1);
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}
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/*
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* _rmt_lseek --- perform an imitation lseek operation remotely
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*/
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long __rmt_lseek(fildes, offset, whence)
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int fildes;
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long offset;
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int whence;
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{
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char buffer[BUFMAGIC];
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sprintf(buffer, "L%d\n%d\n", offset, whence);
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if (command(fildes, buffer) == -1)
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return(-1);
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return(status(fildes));
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}
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/*
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* _rmt_ioctl --- perform raw tape operations remotely
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*/
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#ifndef NO_RMTIOCTL
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__rmt_ioctl(fildes, op, arg)
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int fildes, op;
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char *arg;
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{
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char c;
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int rc, cnt;
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char buffer[BUFMAGIC];
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/*
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* MTIOCOP is the easy one. nothing is transfered in binary
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*/
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if (op == MTIOCTOP)
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{
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sprintf(buffer, "I%d\n%d\n", ((struct mtop *) arg)->mt_op,
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((struct mtop *) arg)->mt_count);
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if (command(fildes, buffer) == -1)
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return(-1);
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return(status(fildes));
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}
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/*
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* we can only handle 2 ops, if not the other one, punt
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*/
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if (op != MTIOCGET)
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{
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errno = EINVAL;
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return(-1);
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}
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/*
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* grab the status and read it directly into the structure
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* this assumes that the status buffer is (hopefully) not
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* padded and that 2 shorts fit in a long without any word
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* alignment problems, ie - the whole struct is contiguous
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* NOTE - this is probably NOT a good assumption.
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*/
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if (command(fildes, "S") == -1 || (rc = status(fildes)) == -1)
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return(-1);
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for (; rc > 0; rc -= cnt, arg += cnt)
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{
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cnt = read(READ(fildes), arg, rc);
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if (cnt <= 0)
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{
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_rmt_panic(fildes);
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errno = EIO;
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return(-1);
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}
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}
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/*
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* now we check for byte position. mt_type is a small integer field
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* (normally) so we will check its magnitude. if it is larger than
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* 256, we will assume that the bytes are swapped and go through
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* and reverse all the bytes
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*/
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if (((struct mtget *) arg)->mt_type < 256)
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return(0);
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for (cnt = 0; cnt < rc; cnt += 2)
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{
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c = arg[cnt];
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arg[cnt] = arg[cnt+1];
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arg[cnt+1] = c;
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}
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return(0);
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}
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#endif /* NO_RMTIOCTL */
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