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/* Serial interface for a pipe to a separate program
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Copyright (C) 1999, 2000, 2001, 2007, 2008, 2009, 2010
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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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "gdb_vfork.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include "gdb_string.h"
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static int pipe_open (struct serial *scb, const char *name);
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static void pipe_close (struct serial *scb);
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extern void _initialize_ser_pipe (void);
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/* Open up a raw pipe */
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pipe_open (struct serial *scb, const char *name)
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struct pipe_state *state;
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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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* 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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if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
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if (socketpair (AF_UNIX, SOCK_STREAM, 0, err_pdes) < 0)
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/* Create the child process to run the command in. Note that the
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apparent call to vfork() below *might* actually be a call to
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fork() due to the fact that autoconf will ``#define vfork fork''
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on certain platforms. */
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if (fcntl (err_pdes[0], F_SETFL, O_NONBLOCK) == -1)
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err_pdes[0] = err_pdes[1] = -1;
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/* We don't want ^c to kill the connection. */
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pid_t sid = setsid ();
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signal (SIGINT, SIG_IGN);
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signal (SIGINT, SIG_IGN);
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/* re-wire pdes[1] to stdin/stdout */
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if (pdes[1] != STDOUT_FILENO)
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dup2 (pdes[1], STDOUT_FILENO);
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dup2 (STDOUT_FILENO, STDIN_FILENO);
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if (err_pdes[0] != -1)
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dup2 (err_pdes[1], STDERR_FILENO);
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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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execl ("/bin/sh", "sh", "-c", name, (char *) 0);
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if (err_pdes[1] != -1)
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state = XMALLOC (struct pipe_state);
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scb->error_fd = err_pdes[0];
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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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pipe_close (struct serial *scb)
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struct pipe_state *state = scb->state;
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int pid = state->pid;
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if (scb->error_fd != -1)
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close (scb->error_fd);
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/* Might be useful to check that the child does die,
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and while we're waiting for it to die print any remaining
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_initialize_ser_pipe (void)
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struct serial_ops *ops = XMALLOC (struct serial_ops);
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memset (ops, 0, sizeof (struct serial_ops));
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ops->open = pipe_open;
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ops->close = pipe_close;
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ops->readchar = ser_base_readchar;
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ops->write = ser_base_write;
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ops->flush_output = ser_base_flush_output;
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ops->flush_input = ser_base_flush_input;
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ops->send_break = ser_base_send_break;
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ops->go_raw = ser_base_raw;
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ops->get_tty_state = ser_base_get_tty_state;
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ops->set_tty_state = ser_base_set_tty_state;
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ops->print_tty_state = ser_base_print_tty_state;
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ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;
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ops->setbaudrate = ser_base_setbaudrate;
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ops->setstopbits = ser_base_setstopbits;
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ops->drain_output = ser_base_drain_output;
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ops->async = ser_base_async;
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ops->read_prim = ser_unix_read_prim;
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ops->write_prim = ser_unix_write_prim;
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serial_add_interface (ops);