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Amiga Format CD 28
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src
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rtape_server.c
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C/C++ Source or Header
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1998-04-23
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5KB
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227 lines
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)rmt.c 5.4 (Berkeley) 6/29/88";
#endif /* not lint */
/* JF added #ifdef about SO_RCVBUF in attempt to make this run on more
machines. Maybe it'll work */
/*
* rmt
*/
#include <stdio.h>
#include <sgtty.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/mtio.h>
#include <errno.h>
int tape = -1;
char *record;
int maxrecsize = -1;
char *checkbuf();
#define SSIZE 64
char device[SSIZE];
char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];
extern errno;
char *sys_errlist[];
char resp[BUFSIZ];
long lseek();
FILE *debug;
#define DEBUG(f) if (debug) fprintf(debug, f)
#define DEBUG1(f,a) if (debug) fprintf(debug, f, a)
#define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2)
main(argc, argv)
int argc;
char **argv;
{
int rval;
char c;
int n, i, cc;
argc--, argv++;
if (argc > 0) {
debug = fopen(*argv, "w");
if (debug == 0)
exit(1);
(void) setbuf(debug, (char *)0);
}
top:
errno = 0;
rval = 0;
if (read(0, &c, 1) != 1)
exit(0);
switch (c) {
case 'O':
if (tape >= 0)
(void) close(tape);
getstring(device); getstring(mode);
DEBUG2("rmtd: O %s %s\n", device, mode);
tape = open(device, atoi(mode),0666);
if (tape < 0)
goto ioerror;
goto respond;
case 'C':
DEBUG("rmtd: C\n");
getstring(device); /* discard */
if (close(tape) < 0)
goto ioerror;
tape = -1;
goto respond;
case 'L':
getstring(count); getstring(pos);
DEBUG2("rmtd: L %s %s\n", count, pos);
rval = lseek(tape, (long) atoi(count), atoi(pos));
if (rval < 0)
goto ioerror;
goto respond;
case 'W':
getstring(count);
n = atoi(count);
DEBUG1("rmtd: W %s\n", count);
record = checkbuf(record, n);
for (i = 0; i < n; i += cc) {
cc = read(0, &record[i], n - i);
if (cc <= 0) {
DEBUG("rmtd: premature eof\n");
exit(2);
}
}
rval = write(tape, record, n);
if (rval < 0)
goto ioerror;
goto respond;
case 'R':
getstring(count);
DEBUG1("rmtd: R %s\n", count);
n = atoi(count);
record = checkbuf(record, n);
rval = read(tape, record, n);
if (rval < 0)
goto ioerror;
(void) sprintf(resp, "A%d\n", rval);
(void) write(1, resp, strlen(resp));
(void) write(1, record, rval);
goto top;
case 'I':
getstring(op); getstring(count);
DEBUG2("rmtd: I %s %s\n", op, count);
{ struct mtop mtop;
mtop.mt_op = atoi(op);
mtop.mt_count = atoi(count);
if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
goto ioerror;
rval = mtop.mt_count;
}
goto respond;
case 'S': /* status */
DEBUG("rmtd: S\n");
{ struct mtget mtget;
if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
goto ioerror;
rval = sizeof (mtget);
(void) sprintf(resp, "A%d\n", rval);
(void) write(1, resp, strlen(resp));
(void) write(1, (char *)&mtget, sizeof (mtget));
goto top;
}
default:
DEBUG1("rmtd: garbage command %c\n", c);
exit(3);
}
respond:
DEBUG1("rmtd: A %d\n", rval);
(void) sprintf(resp, "A%d\n", rval);
(void) write(1, resp, strlen(resp));
goto top;
ioerror:
error(errno);
goto top;
}
getstring(bp)
char *bp;
{
int i;
char *cp = bp;
for (i = 0; i < SSIZE; i++) {
if (read(0, cp+i, 1) != 1)
exit(0);
if (cp[i] == '\n')
break;
}
cp[i] = '\0';
}
char *
checkbuf(record, size)
char *record;
int size;
{
extern char *malloc();
if (size <= maxrecsize)
return (record);
if (record != 0)
free(record);
record = malloc(size);
if (record == 0) {
DEBUG("rmtd: cannot allocate buffer space\n");
exit(4);
}
maxrecsize = size;
#ifdef SO_RCVBUF
while (size > 1024 &&
setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
size -= 1024;
#else
size= 1+((size-1)%1024);
#endif
return (record);
}
error(num)
int num;
{
DEBUG2("rmtd: E %d (%s)\n", num, sys_errlist[num]);
(void) sprintf(resp, "E%d\n%s\n", num, sys_errlist[num]);
(void) write(1, resp, strlen (resp));
}