407 lines
9.0 KiB
C
407 lines
9.0 KiB
C
/* Serial interface for a pipe to a separate program
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Copyright 1999 Free Software Foundation, Inc.
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Contributed by Cygnus Solutions.
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This file is part of GDB.
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This program 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 2 of the License, or
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(at your option) any later version.
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This program 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 this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "serial.h"
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#include <sys/types.h>
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <fcntl.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "signals.h"
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#include "gdb_string.h"
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extern int (*ui_loop_hook) PARAMS ((int));
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static int pipe_open PARAMS ((serial_t scb, const char *name));
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static void pipe_raw PARAMS ((serial_t scb));
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static int wait_for PARAMS ((serial_t scb, int timeout));
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static int pipe_readchar PARAMS ((serial_t scb, int timeout));
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static int pipe_setbaudrate PARAMS ((serial_t scb, int rate));
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static int pipe_setstopbits PARAMS ((serial_t scb, int num));
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static int pipe_write PARAMS ((serial_t scb, const char *str, int len));
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/* FIXME: static void pipe_restore PARAMS ((serial_t scb)); */
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static void pipe_close PARAMS ((serial_t scb));
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static serial_ttystate pipe_get_tty_state PARAMS ((serial_t scb));
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static int pipe_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
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static int pipe_return_0 PARAMS ((serial_t));
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static int pipe_noflush_set_tty_state PARAMS ((serial_t, serial_ttystate,
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serial_ttystate));
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static void pipe_print_tty_state PARAMS ((serial_t, serial_ttystate));
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extern void _initialize_ser_pipe PARAMS ((void));
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#undef XMALLOC
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#define XMALLOC(T) ((T*) xmalloc (sizeof (T)))
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struct pipe_state
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{
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int pid;
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};
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/* Open up a raw pipe */
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static int
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pipe_open (scb, name)
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serial_t scb;
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const char *name;
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{
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#if !defined(O_NONBLOCK) || !defined(F_GETFL) || !defined(F_SETFL) || !HAVE_SOCKETPAIR
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return -1;
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#else
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struct pipe_state *state;
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/* This chunk: */
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/* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software written by Ken Arnold and
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* published in UNIX Review, Vol. 6, No. 8.
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*/
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int pdes[2];
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int pid;
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if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
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return -1;
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pid = vfork ();
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/* Error. */
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if (pid == -1)
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{
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close (pdes[0]);
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close (pdes[1]);
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return -1;
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}
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/* Child. */
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if (pid == 0)
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{
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/* re-wire pdes[1] to stdin/stdout */
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close (pdes[0]);
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if (pdes[1] != STDOUT_FILENO)
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{
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dup2 (pdes[1], STDOUT_FILENO);
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close (pdes[1]);
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}
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dup2 (STDOUT_FILENO, STDIN_FILENO);
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#if 0
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/* close any stray FD's - FIXME - how? */
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/* POSIX.2 B.3.2.2 "popen() shall ensure that any streams
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from previous popen() calls that remain open in the
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parent process are closed in the new child process. */
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for (old = pidlist; old; old = old->next)
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close (fileno (old->fp)); /* don't allow a flush */
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#endif
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execl ("/bin/sh", "sh", "-c", name + 1, NULL);
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_exit (127);
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}
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/* Parent. */
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close (pdes[1]);
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/* :end chunk */
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state = XMALLOC (struct pipe_state);
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state->pid = pid;
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scb->fd = pdes[0];
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scb->state = state;
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/* Make it non-blocking */
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{
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int flags = fcntl (scb->fd, F_GETFL, 0);
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if (fcntl (scb->fd, F_SETFL, flags | O_NONBLOCK) < 0)
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{
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perror ("ser-pipe");
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pipe_close (scb);
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return -1;
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}
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}
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/* If we don't do this, GDB simply exits when the remote side dies. */
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signal (SIGPIPE, SIG_IGN);
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return 0;
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#endif
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}
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static serial_ttystate
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pipe_get_tty_state (scb)
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serial_t scb;
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{
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/* return garbage */
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return xmalloc (sizeof (int));
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}
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static int
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pipe_set_tty_state (scb, ttystate)
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serial_t scb;
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serial_ttystate ttystate;
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{
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return 0;
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}
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static int
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pipe_return_0 (scb)
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serial_t scb;
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{
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return 0;
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}
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static void
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pipe_raw (scb)
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serial_t scb;
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{
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return; /* Always in raw mode */
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}
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/* Wait for input on scb, with timeout seconds. Returns 0 on success,
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otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
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For termio{s}, we actually just setup VTIME if necessary, and let the
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timeout occur in the read() in pipe_read().
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*/
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static int
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wait_for (scb, timeout)
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serial_t scb;
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int timeout;
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{
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int numfds;
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struct timeval tv;
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fd_set readfds, exceptfds;
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FD_ZERO (&readfds);
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FD_ZERO (&exceptfds);
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tv.tv_sec = timeout;
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tv.tv_usec = 0;
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FD_SET (scb->fd, &readfds);
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FD_SET (scb->fd, &exceptfds);
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while (1)
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{
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if (timeout >= 0)
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numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, &tv);
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else
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numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, 0);
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if (numfds <= 0)
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{
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if (numfds == 0)
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return SERIAL_TIMEOUT;
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else if (errno == EINTR)
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continue;
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else
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return SERIAL_ERROR; /* Got an error from select or poll */
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}
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return 0;
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}
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}
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/* Read a character with user-specified timeout. TIMEOUT is number of seconds
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to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
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char if successful. Returns -2 if timeout expired, EOF if line dropped
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dead, or -3 for any other error (see errno in that case). */
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static int
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pipe_readchar (scb, timeout)
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serial_t scb;
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int timeout;
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{
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int status;
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int delta;
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if (scb->bufcnt-- > 0)
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return *scb->bufp++;
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/* We have to be able to keep the GUI alive here, so we break the original
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timeout into steps of 1 second, running the "keep the GUI alive" hook
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each time through the loop.
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Also, timeout = 0 means to poll, so we just set the delta to 0, so we
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will only go through the loop once. */
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delta = (timeout == 0 ? 0 : 1);
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while (1)
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{
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/* N.B. The UI may destroy our world (for instance by calling
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remote_stop,) in which case we want to get out of here as
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quickly as possible. It is not safe to touch scb, since
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someone else might have freed it. The ui_loop_hook signals that
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we should exit by returning 1. */
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if (ui_loop_hook)
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{
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if (ui_loop_hook (0))
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return SERIAL_TIMEOUT;
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}
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status = wait_for (scb, delta);
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timeout -= delta;
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/* If we got a character or an error back from wait_for, then we can
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break from the loop before the timeout is completed. */
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if (status != SERIAL_TIMEOUT)
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{
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break;
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}
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/* If we have exhausted the original timeout, then generate
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a SERIAL_TIMEOUT, and pass it out of the loop. */
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else if (timeout == 0)
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{
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status == SERIAL_TIMEOUT;
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break;
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}
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}
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if (status < 0)
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return status;
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while (1)
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{
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scb->bufcnt = read (scb->fd, scb->buf, BUFSIZ);
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if (scb->bufcnt != -1 || errno != EINTR)
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break;
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}
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if (scb->bufcnt <= 0)
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{
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if (scb->bufcnt == 0)
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return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
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distinguish between EOF & timeouts
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someday] */
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else
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return SERIAL_ERROR; /* Got an error from read */
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}
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scb->bufcnt--;
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scb->bufp = scb->buf;
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return *scb->bufp++;
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}
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static int
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pipe_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
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serial_t scb;
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serial_ttystate new_ttystate;
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serial_ttystate old_ttystate;
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{
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return 0;
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}
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static void
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pipe_print_tty_state (scb, ttystate)
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serial_t scb;
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serial_ttystate ttystate;
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{
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/* Nothing to print. */
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return;
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}
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static int
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pipe_setbaudrate (scb, rate)
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serial_t scb;
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int rate;
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{
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return 0; /* Never fails! */
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}
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static int
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pipe_setstopbits (scb, num)
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serial_t scb;
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int num;
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{
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return 0; /* Never fails! */
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}
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static int
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pipe_write (scb, str, len)
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serial_t scb;
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const char *str;
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int len;
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{
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int cc;
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while (len > 0)
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{
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cc = write (scb->fd, str, len);
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if (cc < 0)
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return 1;
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len -= cc;
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str += cc;
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}
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return 0;
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}
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static void
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pipe_close (scb)
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serial_t scb;
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{
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struct pipe_state *state = scb->state;
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if (state != NULL)
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{
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int pid = state->pid;
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close (scb->fd);
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scb->fd = -1;
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free (state);
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scb->state = NULL;
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kill (pid, SIGTERM);
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/* Might be useful to check that the child does die. */
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}
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}
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static struct serial_ops pipe_ops =
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{
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"pipe",
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0,
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pipe_open,
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pipe_close,
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pipe_readchar,
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pipe_write,
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pipe_return_0, /* flush output */
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pipe_return_0, /* flush input */
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pipe_return_0, /* send break */
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pipe_raw,
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pipe_get_tty_state,
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pipe_set_tty_state,
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pipe_print_tty_state,
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pipe_noflush_set_tty_state,
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pipe_setbaudrate,
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pipe_setstopbits,
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pipe_return_0, /* wait for output to drain */
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};
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void
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_initialize_ser_pipe ()
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{
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serial_add_interface (&pipe_ops);
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}
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