mirror of
https://git.savannah.gnu.org/git/tar.git
synced 2026-09-19 14:44:13 +00:00
Initial revision
This commit is contained in:
François Pinard
@@ -0,0 +1,87 @@
|
|||||||
|
/* Replacement for getopt() that can be used by tar.
|
||||||
|
Copyright (C) 1988 Free Software Foundation
|
||||||
|
|
||||||
|
This file is part of GNU Tar.
|
||||||
|
|
||||||
|
GNU Tar is free software; you can redistribute it and/or modify
|
||||||
|
it under the terms of the GNU General Public License as published by
|
||||||
|
the Free Software Foundation; either version 2, or (at your option)
|
||||||
|
any later version.
|
||||||
|
|
||||||
|
GNU Tar is distributed in the hope that it will be useful,
|
||||||
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
GNU General Public License for more details.
|
||||||
|
|
||||||
|
You should have received a copy of the GNU General Public License
|
||||||
|
along with GNU Tar; see the file COPYING. If not, write to
|
||||||
|
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Plug-compatible replacement for getopt() for parsing tar-like
|
||||||
|
* arguments. If the first argument begins with "-", it uses getopt;
|
||||||
|
* otherwise, it uses the old rules used by tar, dump, and ps.
|
||||||
|
*
|
||||||
|
* Written 25 August 1985 by John Gilmore (ihnp4!hoptoad!gnu)
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <stdio.h>
|
||||||
|
#include "getopt.h"
|
||||||
|
#include "tar.h" /* For msg() declaration if STDC_MSG. */
|
||||||
|
|
||||||
|
int
|
||||||
|
getoldopt(argc, argv, optstring, long_options, opt_index)
|
||||||
|
int argc;
|
||||||
|
char **argv;
|
||||||
|
char *optstring;
|
||||||
|
struct option *long_options;
|
||||||
|
int *opt_index;
|
||||||
|
{
|
||||||
|
extern char *optarg; /* Points to next arg */
|
||||||
|
extern int optind; /* Global argv index */
|
||||||
|
static char *key; /* Points to next keyletter */
|
||||||
|
static char use_getopt; /* !=0 if argv[1][0] was '-' */
|
||||||
|
extern char *index();
|
||||||
|
char c;
|
||||||
|
char *place;
|
||||||
|
|
||||||
|
optarg = NULL;
|
||||||
|
|
||||||
|
if (key == NULL) { /* First time */
|
||||||
|
if (argc < 2) return EOF;
|
||||||
|
key = argv[1];
|
||||||
|
if ((*key == '-') || (*key == '+'))
|
||||||
|
use_getopt++;
|
||||||
|
else
|
||||||
|
optind = 2;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (use_getopt)
|
||||||
|
return getopt_long(argc, argv, optstring,
|
||||||
|
long_options, opt_index);
|
||||||
|
|
||||||
|
c = *key++;
|
||||||
|
if (c == '\0') {
|
||||||
|
key--;
|
||||||
|
return EOF;
|
||||||
|
}
|
||||||
|
place = index(optstring, c);
|
||||||
|
|
||||||
|
if (place == NULL || c == ':') {
|
||||||
|
msg("unknown option %c", c);
|
||||||
|
return('?');
|
||||||
|
}
|
||||||
|
|
||||||
|
place++;
|
||||||
|
if (*place == ':') {
|
||||||
|
if (optind < argc) {
|
||||||
|
optarg = argv[optind];
|
||||||
|
optind++;
|
||||||
|
} else {
|
||||||
|
msg("%c argument missing", c);
|
||||||
|
return('?');
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return(c);
|
||||||
|
}
|
||||||
+569
@@ -0,0 +1,569 @@
|
|||||||
|
/* Functions for communicating with a remote tape drive.
|
||||||
|
Copyright (C) 1988, 1992 Free Software Foundation, Inc.
|
||||||
|
|
||||||
|
This program is free software; you can redistribute it and/or modify
|
||||||
|
it under the terms of the GNU General Public License as published by
|
||||||
|
the Free Software Foundation; either version 2, or (at your option)
|
||||||
|
any later version.
|
||||||
|
|
||||||
|
This program is distributed in the hope that it will be useful,
|
||||||
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||||
|
GNU General Public License for more details.
|
||||||
|
|
||||||
|
You should have received a copy of the GNU General Public License
|
||||||
|
along with this program; if not, write to the Free Software
|
||||||
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||||||
|
|
||||||
|
/* The man page rmt(8) for /etc/rmt documents the remote mag tape
|
||||||
|
protocol which rdump and rrestore use. Unfortunately, the man
|
||||||
|
page is *WRONG*. The author of the routines I'm including originally
|
||||||
|
wrote his code just based on the man page, and it didn't work, so he
|
||||||
|
went to the rdump source to figure out why. The only thing he had to
|
||||||
|
change was to check for the 'F' return code in addition to the 'E',
|
||||||
|
and to separate the various arguments with \n instead of a space. I
|
||||||
|
personally don't think that this is much of a problem, but I wanted to
|
||||||
|
point it out. -- Arnold Robbins
|
||||||
|
|
||||||
|
Originally written by Jeff Lee, modified some by Arnold Robbins.
|
||||||
|
Redone as a library that can replace open, read, write, etc., by
|
||||||
|
Fred Fish, with some additional work by Arnold Robbins.
|
||||||
|
Modified to make all rmtXXX calls into macros for speed by Jay Fenlason.
|
||||||
|
Use -DUSE_REXEC for rexec code, courtesy of Dan Kegel, srs!dan. */
|
||||||
|
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <sys/types.h>
|
||||||
|
#include <signal.h>
|
||||||
|
|
||||||
|
#ifndef NO_MTIO
|
||||||
|
#include <sys/ioctl.h>
|
||||||
|
#include <sys/mtio.h>
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef USE_REXEC
|
||||||
|
#include <netdb.h>
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#include <errno.h>
|
||||||
|
#include <setjmp.h>
|
||||||
|
#include <sys/stat.h>
|
||||||
|
|
||||||
|
#ifndef errno
|
||||||
|
extern int errno;
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* Maximum size of a fully qualified host name. */
|
||||||
|
#define MAXHOSTLEN 257
|
||||||
|
|
||||||
|
/* Size of buffers for reading and writing commands to rmt.
|
||||||
|
(An arbitrary limit.) */
|
||||||
|
#define CMDBUFSIZE 64
|
||||||
|
|
||||||
|
#ifndef RETSIGTYPE
|
||||||
|
#define RETSIGTYPE void
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* Maximum number of simultaneous remote tape connections.
|
||||||
|
(Another arbitrary limit.) */
|
||||||
|
#define MAXUNIT 4
|
||||||
|
|
||||||
|
/* Return the parent's read side of remote tape connection FILDES. */
|
||||||
|
#define READ(fildes) (from_rmt[fildes][0])
|
||||||
|
|
||||||
|
/* Return the parent's write side of remote tape connection FILDES. */
|
||||||
|
#define WRITE(fildes) (to_rmt[fildes][1])
|
||||||
|
|
||||||
|
/* The pipes for receiving data from remote tape drives. */
|
||||||
|
static int from_rmt[MAXUNIT][2] = {-1, -1, -1, -1, -1, -1, -1, -1};
|
||||||
|
|
||||||
|
/* The pipes for sending data to remote tape drives. */
|
||||||
|
static int to_rmt[MAXUNIT][2] = {-1, -1, -1, -1, -1, -1, -1, -1};
|
||||||
|
|
||||||
|
/* Temporary variable used by macros in rmt.h. */
|
||||||
|
char *__rmt_path;
|
||||||
|
|
||||||
|
/* Close remote tape connection FILDES. */
|
||||||
|
|
||||||
|
static void
|
||||||
|
_rmt_shutdown (fildes)
|
||||||
|
int fildes;
|
||||||
|
{
|
||||||
|
close (READ (fildes));
|
||||||
|
close (WRITE (fildes));
|
||||||
|
READ (fildes) = -1;
|
||||||
|
WRITE (fildes) = -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Attempt to perform the remote tape command specified in BUF
|
||||||
|
on remote tape connection FILDES.
|
||||||
|
Return 0 if successful, -1 on error. */
|
||||||
|
|
||||||
|
static int
|
||||||
|
command (fildes, buf)
|
||||||
|
int fildes;
|
||||||
|
char *buf;
|
||||||
|
{
|
||||||
|
register int buflen;
|
||||||
|
RETSIGTYPE (*pipe_handler) ();
|
||||||
|
|
||||||
|
/* Save the current pipe handler and try to make the request. */
|
||||||
|
|
||||||
|
pipe_handler = signal (SIGPIPE, SIG_IGN);
|
||||||
|
buflen = strlen (buf);
|
||||||
|
if (write (WRITE (fildes), buf, buflen) == buflen)
|
||||||
|
{
|
||||||
|
signal (SIGPIPE, pipe_handler);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Something went wrong. Close down and go home. */
|
||||||
|
|
||||||
|
signal (SIGPIPE, pipe_handler);
|
||||||
|
_rmt_shutdown (fildes);
|
||||||
|
errno = EIO;
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Read and return the status from remote tape connection FILDES.
|
||||||
|
If an error occurred, return -1 and set errno. */
|
||||||
|
|
||||||
|
static int
|
||||||
|
status (fildes)
|
||||||
|
int fildes;
|
||||||
|
{
|
||||||
|
int i;
|
||||||
|
char c, *cp;
|
||||||
|
char buffer[CMDBUFSIZE];
|
||||||
|
|
||||||
|
/* Read the reply command line. */
|
||||||
|
|
||||||
|
for (i = 0, cp = buffer; i < CMDBUFSIZE; i++, cp++)
|
||||||
|
{
|
||||||
|
if (read (READ (fildes), cp, 1) != 1)
|
||||||
|
{
|
||||||
|
_rmt_shutdown (fildes);
|
||||||
|
errno = EIO;
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
if (*cp == '\n')
|
||||||
|
{
|
||||||
|
*cp = '\0';
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (i == CMDBUFSIZE)
|
||||||
|
{
|
||||||
|
_rmt_shutdown (fildes);
|
||||||
|
errno = EIO;
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Check the return status. */
|
||||||
|
|
||||||
|
for (cp = buffer; *cp; cp++)
|
||||||
|
if (*cp != ' ')
|
||||||
|
break;
|
||||||
|
|
||||||
|
if (*cp == 'E' || *cp == 'F')
|
||||||
|
{
|
||||||
|
errno = atoi (cp + 1);
|
||||||
|
/* Skip the error message line. */
|
||||||
|
while (read (READ (fildes), &c, 1) == 1)
|
||||||
|
if (c == '\n')
|
||||||
|
break;
|
||||||
|
|
||||||
|
if (*cp == 'F')
|
||||||
|
_rmt_shutdown (fildes);
|
||||||
|
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Check for mis-synced pipes. */
|
||||||
|
|
||||||
|
if (*cp != 'A')
|
||||||
|
{
|
||||||
|
_rmt_shutdown (fildes);
|
||||||
|
errno = EIO;
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Got an `A' (success) response. */
|
||||||
|
return atoi (cp + 1);
|
||||||
|
}
|
||||||
|
|
||||||
|
#ifdef USE_REXEC
|
||||||
|
/* Execute /etc/rmt as user USER on remote system HOST using rexec.
|
||||||
|
Return a file descriptor of a bidirectional socket for stdin and stdout.
|
||||||
|
If USER is NULL, or an empty string, use the current username.
|
||||||
|
|
||||||
|
By default, this code is not used, since it requires that
|
||||||
|
the user have a .netrc file in his/her home directory, or that the
|
||||||
|
application designer be willing to have rexec prompt for login and
|
||||||
|
password info. This may be unacceptable, and .rhosts files for use
|
||||||
|
with rsh are much more common on BSD systems. */
|
||||||
|
|
||||||
|
static int
|
||||||
|
_rmt_rexec (host, user)
|
||||||
|
char *host;
|
||||||
|
char *user;
|
||||||
|
{
|
||||||
|
struct servent *rexecserv;
|
||||||
|
int save_stdin = dup (fileno (stdin));
|
||||||
|
int save_stdout = dup (fileno (stdout));
|
||||||
|
int tape_fd; /* Return value. */
|
||||||
|
|
||||||
|
/* When using cpio -o < filename, stdin is no longer the tty.
|
||||||
|
But the rexec subroutine reads the login and the passwd on stdin,
|
||||||
|
to allow remote execution of the command.
|
||||||
|
So, reopen stdin and stdout on /dev/tty before the rexec and
|
||||||
|
give them back their original value after. */
|
||||||
|
if (freopen ("/dev/tty", "r", stdin) == NULL)
|
||||||
|
freopen ("/dev/null", "r", stdin);
|
||||||
|
if (freopen ("/dev/tty", "w", stdout) == NULL)
|
||||||
|
freopen ("/dev/null", "w", stdout);
|
||||||
|
|
||||||
|
rexecserv = getservbyname ("exec", "tcp");
|
||||||
|
if (NULL == rexecserv)
|
||||||
|
{
|
||||||
|
fprintf (stderr, "exec/tcp: service not available");
|
||||||
|
exit (1);
|
||||||
|
}
|
||||||
|
if (user != NULL && *user == '\0')
|
||||||
|
user = NULL;
|
||||||
|
tape_fd = rexec (&host, rexecserv->s_port, user, NULL,
|
||||||
|
"/etc/rmt", (int *) NULL);
|
||||||
|
fclose (stdin);
|
||||||
|
fdopen (save_stdin, "r");
|
||||||
|
fclose (stdout);
|
||||||
|
fdopen (save_stdout, "w");
|
||||||
|
|
||||||
|
return tape_fd;
|
||||||
|
}
|
||||||
|
#endif /* USE_REXEC */
|
||||||
|
|
||||||
|
/* Open a magtape device on the system specified in PATH, as the given user.
|
||||||
|
PATH has the form `[user@]system:/dev/????'.
|
||||||
|
If COMPAT is defined, it can also have the form `system[.user]:/dev/????'.
|
||||||
|
|
||||||
|
OFLAG is O_RDONLY, O_WRONLY, etc.
|
||||||
|
MODE is ignored; 0666 is always used.
|
||||||
|
|
||||||
|
If successful, return the remote tape pipe number plus BIAS.
|
||||||
|
On error, return -1. */
|
||||||
|
|
||||||
|
int
|
||||||
|
__rmt_open (path, oflag, mode, bias)
|
||||||
|
char *path;
|
||||||
|
int oflag;
|
||||||
|
int mode;
|
||||||
|
int bias;
|
||||||
|
{
|
||||||
|
int i, rc;
|
||||||
|
char buffer[CMDBUFSIZE]; /* Command buffer. */
|
||||||
|
char system[MAXHOSTLEN]; /* The remote host name. */
|
||||||
|
char device[CMDBUFSIZE]; /* The remote device name. */
|
||||||
|
char login[CMDBUFSIZE]; /* The remote user name. */
|
||||||
|
char *sys, *dev, *user; /* For copying into the above buffers. */
|
||||||
|
|
||||||
|
sys = system;
|
||||||
|
dev = device;
|
||||||
|
user = login;
|
||||||
|
|
||||||
|
/* Find an unused pair of file descriptors. */
|
||||||
|
|
||||||
|
for (i = 0; i < MAXUNIT; i++)
|
||||||
|
if (READ (i) == -1 && WRITE (i) == -1)
|
||||||
|
break;
|
||||||
|
|
||||||
|
if (i == MAXUNIT)
|
||||||
|
{
|
||||||
|
errno = EMFILE;
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Pull apart the system and device, and optional user.
|
||||||
|
Don't munge the original string. */
|
||||||
|
|
||||||
|
while (*path != '@'
|
||||||
|
#ifdef COMPAT
|
||||||
|
&& *path != '.'
|
||||||
|
#endif
|
||||||
|
&& *path != ':')
|
||||||
|
{
|
||||||
|
*sys++ = *path++;
|
||||||
|
}
|
||||||
|
*sys = '\0';
|
||||||
|
path++;
|
||||||
|
|
||||||
|
if (*(path - 1) == '@')
|
||||||
|
{
|
||||||
|
/* Saw user part of user@host. Start over. */
|
||||||
|
strcpy (user, system);
|
||||||
|
sys = system;
|
||||||
|
while (*path != ':')
|
||||||
|
{
|
||||||
|
*sys++ = *path++;
|
||||||
|
}
|
||||||
|
*sys = '\0';
|
||||||
|
path++;
|
||||||
|
}
|
||||||
|
#ifdef COMPAT
|
||||||
|
else if (*(path - 1) == '.')
|
||||||
|
{
|
||||||
|
while (*path != ':')
|
||||||
|
{
|
||||||
|
*user++ = *path++;
|
||||||
|
}
|
||||||
|
*user = '\0';
|
||||||
|
path++;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
else
|
||||||
|
*user = '\0';
|
||||||
|
|
||||||
|
while (*path)
|
||||||
|
{
|
||||||
|
*dev++ = *path++;
|
||||||
|
}
|
||||||
|
*dev = '\0';
|
||||||
|
|
||||||
|
#ifdef USE_REXEC
|
||||||
|
/* Execute the remote command using rexec. */
|
||||||
|
READ (i) = WRITE (i) = _rmt_rexec (system, login);
|
||||||
|
if (READ (i) < 0)
|
||||||
|
return -1;
|
||||||
|
#else /* !USE_REXEC */
|
||||||
|
/* Set up the pipes for the `rsh' command, and fork. */
|
||||||
|
|
||||||
|
if (pipe (to_rmt[i]) == -1 || pipe (from_rmt[i]) == -1)
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
rc = fork ();
|
||||||
|
if (rc == -1)
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
if (rc == 0)
|
||||||
|
{
|
||||||
|
/* Child. */
|
||||||
|
close (0);
|
||||||
|
dup (to_rmt[i][0]);
|
||||||
|
close (to_rmt[i][0]);
|
||||||
|
close (to_rmt[i][1]);
|
||||||
|
|
||||||
|
close (1);
|
||||||
|
dup (from_rmt[i][1]);
|
||||||
|
close (from_rmt[i][0]);
|
||||||
|
close (from_rmt[i][1]);
|
||||||
|
|
||||||
|
setuid (getuid ());
|
||||||
|
setgid (getgid ());
|
||||||
|
|
||||||
|
if (*login)
|
||||||
|
{
|
||||||
|
execl ("/usr/ucb/rsh", "rsh", system, "-l", login,
|
||||||
|
"/etc/rmt", (char *) 0);
|
||||||
|
execl ("/usr/bin/remsh", "remsh", system, "-l", login,
|
||||||
|
"/etc/rmt", (char *) 0);
|
||||||
|
execl ("/usr/bin/rsh", "rsh", system, "-l", login,
|
||||||
|
"/etc/rmt", (char *) 0);
|
||||||
|
execl ("/usr/bsd/rsh", "rsh", system, "-l", login,
|
||||||
|
"/etc/rmt", (char *) 0);
|
||||||
|
execl ("/usr/bin/nsh", "nsh", system, "-l", login,
|
||||||
|
"/etc/rmt", (char *) 0);
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
execl ("/usr/ucb/rsh", "rsh", system,
|
||||||
|
"/etc/rmt", (char *) 0);
|
||||||
|
execl ("/usr/bin/remsh", "remsh", system,
|
||||||
|
"/etc/rmt", (char *) 0);
|
||||||
|
execl ("/usr/bin/rsh", "rsh", system,
|
||||||
|
"/etc/rmt", (char *) 0);
|
||||||
|
execl ("/usr/bsd/rsh", "rsh", system,
|
||||||
|
"/etc/rmt", (char *) 0);
|
||||||
|
execl ("/usr/bin/nsh", "nsh", system,
|
||||||
|
"/etc/rmt", (char *) 0);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Bad problems if we get here. */
|
||||||
|
|
||||||
|
perror ("cannot execute remote shell");
|
||||||
|
_exit (1);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Parent. */
|
||||||
|
close (to_rmt[i][0]);
|
||||||
|
close (from_rmt[i][1]);
|
||||||
|
#endif /* !USE_REXEC */
|
||||||
|
|
||||||
|
/* Attempt to open the tape device. */
|
||||||
|
|
||||||
|
sprintf (buffer, "O%s\n%d\n", device, oflag);
|
||||||
|
if (command (i, buffer) == -1 || status (i) == -1)
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
return i + bias;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Close remote tape connection FILDES and shut down.
|
||||||
|
Return 0 if successful, -1 on error. */
|
||||||
|
|
||||||
|
int
|
||||||
|
__rmt_close (fildes)
|
||||||
|
int fildes;
|
||||||
|
{
|
||||||
|
int rc;
|
||||||
|
|
||||||
|
if (command (fildes, "C\n") == -1)
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
rc = status (fildes);
|
||||||
|
_rmt_shutdown (fildes);
|
||||||
|
return rc;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Read up to NBYTE bytes into BUF from remote tape connection FILDES.
|
||||||
|
Return the number of bytes read on success, -1 on error. */
|
||||||
|
|
||||||
|
int
|
||||||
|
__rmt_read (fildes, buf, nbyte)
|
||||||
|
int fildes;
|
||||||
|
char *buf;
|
||||||
|
unsigned int nbyte;
|
||||||
|
{
|
||||||
|
int rc, i;
|
||||||
|
char buffer[CMDBUFSIZE];
|
||||||
|
|
||||||
|
sprintf (buffer, "R%d\n", nbyte);
|
||||||
|
if (command (fildes, buffer) == -1 || (rc = status (fildes)) == -1)
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
for (i = 0; i < rc; i += nbyte, buf += nbyte)
|
||||||
|
{
|
||||||
|
nbyte = read (READ (fildes), buf, rc);
|
||||||
|
if (nbyte <= 0)
|
||||||
|
{
|
||||||
|
_rmt_shutdown (fildes);
|
||||||
|
errno = EIO;
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return rc;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Write NBYTE bytes from BUF to remote tape connection FILDES.
|
||||||
|
Return the number of bytes written on success, -1 on error. */
|
||||||
|
|
||||||
|
int
|
||||||
|
__rmt_write (fildes, buf, nbyte)
|
||||||
|
int fildes;
|
||||||
|
char *buf;
|
||||||
|
unsigned int nbyte;
|
||||||
|
{
|
||||||
|
char buffer[CMDBUFSIZE];
|
||||||
|
RETSIGTYPE (*pipe_handler) ();
|
||||||
|
|
||||||
|
sprintf (buffer, "W%d\n", nbyte);
|
||||||
|
if (command (fildes, buffer) == -1)
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
pipe_handler = signal (SIGPIPE, SIG_IGN);
|
||||||
|
if (write (WRITE (fildes), buf, nbyte) == nbyte)
|
||||||
|
{
|
||||||
|
signal (SIGPIPE, pipe_handler);
|
||||||
|
return status (fildes);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Write error. */
|
||||||
|
signal (SIGPIPE, pipe_handler);
|
||||||
|
_rmt_shutdown (fildes);
|
||||||
|
errno = EIO;
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Perform an imitation lseek operation on remote tape connection FILDES.
|
||||||
|
Return the new file offset if successful, -1 if on error. */
|
||||||
|
|
||||||
|
long
|
||||||
|
__rmt_lseek (fildes, offset, whence)
|
||||||
|
int fildes;
|
||||||
|
long offset;
|
||||||
|
int whence;
|
||||||
|
{
|
||||||
|
char buffer[CMDBUFSIZE];
|
||||||
|
|
||||||
|
sprintf (buffer, "L%ld\n%d\n", offset, whence);
|
||||||
|
if (command (fildes, buffer) == -1)
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
return status (fildes);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Perform a raw tape operation on remote tape connection FILDES.
|
||||||
|
Return the results of the ioctl, or -1 on error. */
|
||||||
|
|
||||||
|
#ifndef NO_MTIO
|
||||||
|
__rmt_ioctl (fildes, op, arg)
|
||||||
|
int fildes, op;
|
||||||
|
char *arg;
|
||||||
|
{
|
||||||
|
char c;
|
||||||
|
int rc, cnt;
|
||||||
|
char buffer[CMDBUFSIZE];
|
||||||
|
|
||||||
|
switch (op)
|
||||||
|
{
|
||||||
|
default:
|
||||||
|
errno = EINVAL;
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
case MTIOCTOP:
|
||||||
|
/* MTIOCTOP is the easy one. Nothing is transfered in binary. */
|
||||||
|
sprintf (buffer, "I%d\n%d\n", ((struct mtop *) arg)->mt_op,
|
||||||
|
((struct mtop *) arg)->mt_count);
|
||||||
|
if (command (fildes, buffer) == -1)
|
||||||
|
return -1;
|
||||||
|
return status (fildes); /* Return the count. */
|
||||||
|
|
||||||
|
case MTIOCGET:
|
||||||
|
/* Grab the status and read it directly into the structure.
|
||||||
|
This assumes that the status buffer is not padded
|
||||||
|
and that 2 shorts fit in a long without any word
|
||||||
|
alignment problems; i.e., the whole struct is contiguous.
|
||||||
|
NOTE - this is probably NOT a good assumption. */
|
||||||
|
|
||||||
|
if (command (fildes, "S") == -1 || (rc = status (fildes)) == -1)
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
for (; rc > 0; rc -= cnt, arg += cnt)
|
||||||
|
{
|
||||||
|
cnt = read (READ (fildes), arg, rc);
|
||||||
|
if (cnt <= 0)
|
||||||
|
{
|
||||||
|
_rmt_shutdown (fildes);
|
||||||
|
errno = EIO;
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Check for byte position. mt_type is a small integer field
|
||||||
|
(normally) so we will check its magnitude. If it is larger than
|
||||||
|
256, we will assume that the bytes are swapped and go through
|
||||||
|
and reverse all the bytes. */
|
||||||
|
|
||||||
|
if (((struct mtget *) arg)->mt_type < 256)
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
for (cnt = 0; cnt < rc; cnt += 2)
|
||||||
|
{
|
||||||
|
c = arg[cnt];
|
||||||
|
arg[cnt] = arg[cnt + 1];
|
||||||
|
arg[cnt + 1] = c;
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
#endif /* NO_MTIO */
|
||||||
Reference in New Issue
Block a user