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Diffstat (limited to 'gdb/ser-pipe.c')
| -rw-r--r-- | gdb/ser-pipe.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/gdb/ser-pipe.c b/gdb/ser-pipe.c new file mode 100644 index 00000000000..bca0e54e4ba --- /dev/null +++ b/gdb/ser-pipe.c @@ -0,0 +1,161 @@ +/* Serial interface for a pipe to a separate program + Copyright 1999, 2000, 2001 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 2 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, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include "defs.h" +#include "serial.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 pid; + if (socketpair (AF_UNIX, SOCK_STREAM, 0, 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]); + return -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 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, NULL); + _exit (127); + } + + /* Parent. */ + close (pdes[1]); + /* :end chunk */ + state = XMALLOC (struct pipe_state); + state->pid = pid; + scb->fd = 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, sizeof (struct serial_ops), 0); + ops->name = "pipe"; + ops->next = 0; + ops->open = pipe_open; + ops->close = pipe_close; + ops->readchar = ser_unix_readchar; + ops->write = ser_unix_write; + ops->flush_output = ser_unix_nop_flush_output; + ops->flush_input = ser_unix_flush_input; + ops->send_break = ser_unix_nop_send_break; + ops->go_raw = ser_unix_nop_raw; + ops->get_tty_state = ser_unix_nop_get_tty_state; + ops->set_tty_state = ser_unix_nop_set_tty_state; + ops->print_tty_state = ser_unix_nop_print_tty_state; + ops->noflush_set_tty_state = ser_unix_nop_noflush_set_tty_state; + ops->setbaudrate = ser_unix_nop_setbaudrate; + ops->setstopbits = ser_unix_nop_setstopbits; + ops->drain_output = ser_unix_nop_drain_output; + ops->async = ser_unix_async; + serial_add_interface (ops); +} |