| /* Serial interface for a pipe to a separate program |
| Copyright (C) 1999, 2000, 2001, 2007, 2008 Free Software Foundation, Inc. |
| |
| Contributed by Cygnus Solutions. |
| |
| This file is part of GDB. |
| |
| 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 3 of the License, 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, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| #include "serial.h" |
| #include "ser-base.h" |
| #include "ser-unix.h" |
| |
| #include "gdb_vfork.h" |
| |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <sys/time.h> |
| #include <fcntl.h> |
| #include "gdb_string.h" |
| |
| #include <signal.h> |
| |
| static int pipe_open (struct serial *scb, const char *name); |
| static void pipe_close (struct serial *scb); |
| |
| extern void _initialize_ser_pipe (void); |
| |
| struct pipe_state |
| { |
| int pid; |
| }; |
| |
| /* Open up a raw pipe */ |
| |
| static int |
| pipe_open (struct serial *scb, const char *name) |
| { |
| #if !HAVE_SOCKETPAIR |
| return -1; |
| #else |
| struct pipe_state *state; |
| /* This chunk: */ |
| /* Copyright (c) 1988, 1993 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * This code is derived from software written by Ken Arnold and |
| * published in UNIX Review, Vol. 6, No. 8. |
| */ |
| int pdes[2]; |
| int err_pdes[2]; |
| int pid; |
| if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0) |
| return -1; |
| if (socketpair (AF_UNIX, SOCK_STREAM, 0, err_pdes) < 0) |
| return -1; |
| |
| /* Create the child process to run the command in. Note that the |
| apparent call to vfork() below *might* actually be a call to |
| fork() due to the fact that autoconf will ``#define vfork fork'' |
| on certain platforms. */ |
| pid = vfork (); |
| |
| /* Error. */ |
| if (pid == -1) |
| { |
| close (pdes[0]); |
| close (pdes[1]); |
| close (err_pdes[0]); |
| close (err_pdes[1]); |
| return -1; |
| } |
| |
| if (fcntl (err_pdes[0], F_SETFL, O_NONBLOCK) == -1) |
| { |
| close (err_pdes[0]); |
| close (err_pdes[1]); |
| err_pdes[0] = err_pdes[1] = -1; |
| } |
| |
| /* Child. */ |
| if (pid == 0) |
| { |
| /* re-wire pdes[1] to stdin/stdout */ |
| close (pdes[0]); |
| if (pdes[1] != STDOUT_FILENO) |
| { |
| dup2 (pdes[1], STDOUT_FILENO); |
| close (pdes[1]); |
| } |
| dup2 (STDOUT_FILENO, STDIN_FILENO); |
| |
| if (err_pdes[0] != -1) |
| { |
| close (err_pdes[0]); |
| dup2 (err_pdes[1], STDERR_FILENO); |
| close (err_pdes[1]); |
| } |
| #if 0 |
| /* close any stray FD's - FIXME - how? */ |
| /* POSIX.2 B.3.2.2 "popen() shall ensure that any streams |
| from previous popen() calls that remain open in the |
| parent process are closed in the new child process. */ |
| for (old = pidlist; old; old = old->next) |
| close (fileno (old->fp)); /* don't allow a flush */ |
| #endif |
| execl ("/bin/sh", "sh", "-c", name, (char *) 0); |
| _exit (127); |
| } |
| |
| /* Parent. */ |
| close (pdes[1]); |
| /* :end chunk */ |
| state = XMALLOC (struct pipe_state); |
| state->pid = pid; |
| scb->fd = pdes[0]; |
| scb->error_fd = err_pdes[0]; |
| scb->state = state; |
| |
| /* If we don't do this, GDB simply exits when the remote side dies. */ |
| signal (SIGPIPE, SIG_IGN); |
| return 0; |
| #endif |
| } |
| |
| static void |
| pipe_close (struct serial *scb) |
| { |
| struct pipe_state *state = scb->state; |
| if (state != NULL) |
| { |
| int pid = state->pid; |
| close (scb->fd); |
| scb->fd = -1; |
| xfree (state); |
| scb->state = NULL; |
| kill (pid, SIGTERM); |
| /* Might be useful to check that the child does die. */ |
| } |
| } |
| |
| static struct serial_ops pipe_ops; |
| |
| void |
| _initialize_ser_pipe (void) |
| { |
| struct serial_ops *ops = XMALLOC (struct serial_ops); |
| memset (ops, 0, sizeof (struct serial_ops)); |
| ops->name = "pipe"; |
| ops->next = 0; |
| ops->open = pipe_open; |
| ops->close = pipe_close; |
| ops->readchar = ser_base_readchar; |
| ops->write = ser_base_write; |
| ops->flush_output = ser_base_flush_output; |
| ops->flush_input = ser_base_flush_input; |
| ops->send_break = ser_base_send_break; |
| ops->go_raw = ser_base_raw; |
| ops->get_tty_state = ser_base_get_tty_state; |
| ops->set_tty_state = ser_base_set_tty_state; |
| ops->print_tty_state = ser_base_print_tty_state; |
| ops->noflush_set_tty_state = ser_base_noflush_set_tty_state; |
| ops->setbaudrate = ser_base_setbaudrate; |
| ops->setstopbits = ser_base_setstopbits; |
| ops->drain_output = ser_base_drain_output; |
| ops->async = ser_base_async; |
| ops->read_prim = ser_unix_read_prim; |
| ops->write_prim = ser_unix_write_prim; |
| serial_add_interface (ops); |
| } |