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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stropts.h>
#include <poll.h>
#include <signal.h>
#include <errno.h>
#include "ttymon.h"
#include "tmstruct.h"
#include "tmextern.h"
#define BRK 1
#define DEL 2
struct strbuf *do_peek(int, int);
static int process(int, struct strbuf *);
static int interrupt;
/*
* poll_data - it polls the device, waiting for data
* - return BADSPEED it <brk> is received
* - return the result of process if data is received
* - write a newline if <del> is received
* - exit if hangup is received
*/
int
poll_data(void)
{
int j;
struct strbuf *ptr;
struct pollfd fds[1];
struct sigaction sigact;
#ifdef DEBUG
debug("in poll_data");
#endif
if (peek_ptr != NULL) {
for (j = 0; j < peek_ptr->len; j++)
peek_ptr->buf[j] &= 0x7F;
return (process(0, peek_ptr));
}
fds[0].fd = 0;
fds[0].events = POLLIN;
sigact.sa_flags = 0;
sigact.sa_handler = sigint;
(void) sigemptyset(&sigact.sa_mask);
(void) sigaddset(&sigact.sa_mask, SIGINT);
(void) sigaction(SIGINT, &sigact, NULL);
for (;;) {
interrupt = 0;
if ((j = poll(fds, 1, -1)) == -1) {
if (interrupt == BRK) {
return (BADSPEED);
}
if (interrupt == DEL) { /* XXX revisit kmd */
return (BADSPEED);
}
} else if (j > 0) {
if (fds[0].revents & POLLHUP) {
log("POLLHUP received, about to exit");
exit(1);
}
if (fds[0].revents & POLLIN) {
ptr = do_peek(fds[0].fd, 255);
if (ptr != NULL) {
return (process(fds[0].fd, ptr));
}
}
}
}
}
/*
* process - process the data
* - return GOODNAME if it is a non-empty line
* - return NONAME if a <CR> is received
* - return BADNAME if zero byte is detected
* - except the case of GOODNAME, data will be pulled out
* of the stream
*/
static int
process(
int fd, /* fd to read data from if necessary */
struct strbuf *ptr) /* ptr that holds data in ptr->buf */
{
unsigned i;
char junk[BUFSIZ];
for (i = 0; i < ptr->len; i++) {
if (ptr->buf[i] == '\0') {
(void) read(fd, junk, i+1);
return (BADSPEED);
} else if ((ptr->buf[i] == '\n') || (ptr->buf[i] == '\r')) {
if (i == 0) {
(void) read(fd, junk, ptr->len);
return (NONAME);
} else
return (GOODNAME);
}
} /* end for loop */
/* end of input is encountered */
#ifdef DEBUG
debug("in process: EOF encountered");
#endif
exit(1);
/*NOTREACHED*/
}
/*
* do_peek - peek at the stream to get the data
* int fd; fd to do the ioctl on
* int n; maxlen of data to peek at
* - this only called when POLLIN is detected,
* - so there should always be something there
* - return a ptr to the buf that contains the data
* - return NULL if nothing to peek at
*/
struct strbuf *
do_peek(int fd, int n)
{
int ret;
static struct strpeek peek;
struct strpeek *peekp;
static char buf[BUFSIZ];
#ifdef DEBUG
debug("in do_peek");
#endif
peekp = &peek;
peekp->flags = 0;
/* need to ask for ctl info to avoid bug in I_PEEK code */
peekp->ctlbuf.maxlen = 1;
peekp->ctlbuf.buf = buf;
peekp->databuf.maxlen = n;
peekp->databuf.buf = buf;
ret = ioctl(fd, I_PEEK, &peek);
if (ret == -1) {
log("do_peek: I_PEEK failed: %s", errno);
exit(1);
}
if (ret == 0) {
return (NULL);
}
return (&(peekp->databuf));
}
/*
* sigint - this is called when SIGINT is caught
*/
void
sigint(int s __unused)
{
struct strbuf *ptr;
char junk[2];
#ifdef DEBUG
debug("in sigint");
#endif
ptr = do_peek(0, 1);
if (ptr == NULL) { /* somebody type <del> */
interrupt = DEL;
} else {
if (ptr->buf[0] == '\0') {
/* somebody type <brk> or frame error */
(void) read(0, junk, 1);
interrupt = BRK;
}
}
}
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