mirror of
https://github.com/bminor/binutils-gdb.git
synced 2025-12-27 01:28:46 +00:00
import gdb-1999-07-12 snapshot
This commit is contained in:
Jason Molenda
397
gdb/ser-pipe.c
Normal file
397
gdb/ser-pipe.c
Normal file
@@ -0,0 +1,397 @@
|
||||
/* Serial interface for a pipe to a separate program
|
||||
Copyright 1999 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 <sys/types.h>
|
||||
#include <sys/wait.h>
|
||||
#include <sys/socket.h>
|
||||
#include <sys/time.h>
|
||||
#include <fcntl.h>
|
||||
#ifdef HAVE_UNISTD_H
|
||||
#include <unistd.h>
|
||||
#endif
|
||||
|
||||
#include "signals.h"
|
||||
#include "gdb_string.h"
|
||||
|
||||
extern int (*ui_loop_hook) PARAMS ((int));
|
||||
|
||||
static int pipe_open PARAMS ((serial_t scb, const char *name));
|
||||
static void pipe_raw PARAMS ((serial_t scb));
|
||||
static int wait_for PARAMS ((serial_t scb, int timeout));
|
||||
static int pipe_readchar PARAMS ((serial_t scb, int timeout));
|
||||
static int pipe_setbaudrate PARAMS ((serial_t scb, int rate));
|
||||
static int pipe_setstopbits PARAMS ((serial_t scb, int num));
|
||||
static int pipe_write PARAMS ((serial_t scb, const char *str, int len));
|
||||
/* FIXME: static void pipe_restore PARAMS ((serial_t scb)); */
|
||||
static void pipe_close PARAMS ((serial_t scb));
|
||||
static serial_ttystate pipe_get_tty_state PARAMS ((serial_t scb));
|
||||
static int pipe_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
|
||||
static int pipe_return_0 PARAMS ((serial_t));
|
||||
static int pipe_noflush_set_tty_state PARAMS ((serial_t, serial_ttystate,
|
||||
serial_ttystate));
|
||||
static void pipe_print_tty_state PARAMS ((serial_t, serial_ttystate));
|
||||
|
||||
extern void _initialize_ser_pipe PARAMS ((void));
|
||||
|
||||
/* Open up a raw pipe */
|
||||
|
||||
static int
|
||||
pipe_open (scb, name)
|
||||
serial_t scb;
|
||||
const char *name;
|
||||
{
|
||||
#if !defined(O_NONBLOCK) || !defined(F_GETFL) || !defined(F_SETFL)
|
||||
return -1;
|
||||
#else
|
||||
#if defined (__NetBSD__) || defined (__FreeBSD__)
|
||||
|
||||
/* check the BSD popen sources for where "r+" comes from :-) */
|
||||
FILE *stream;
|
||||
stream = popen (name + 1, "r+");
|
||||
if (stream == NULL)
|
||||
{
|
||||
fprintf_unfiltered (gdb_stderr, "%s: popen failed\n", name + 1);
|
||||
return -1;
|
||||
}
|
||||
scb->ttystate = stream; /* borrow that space */
|
||||
scb->fd = fileno (stream);
|
||||
|
||||
#else
|
||||
|
||||
/* 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;
|
||||
|
||||
switch (pid = vfork ())
|
||||
{
|
||||
case -1: /* Error. */
|
||||
close (pdes[0]);
|
||||
close (pdes[1]);
|
||||
return -1;
|
||||
case 0: /* Child. */
|
||||
#if 0
|
||||
/* 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
|
||||
close (pdes[0]);
|
||||
if (pdes[1] != STDOUT_FILENO)
|
||||
{
|
||||
dup2 (pdes[1], STDOUT_FILENO);
|
||||
close (pdes[1]);
|
||||
}
|
||||
dup2 (STDOUT_FILENO, STDIN_FILENO);
|
||||
execl ("/bin/sh", "sh", "-c", name + 1, NULL);
|
||||
_exit (127);
|
||||
}
|
||||
|
||||
/* Parent; assume fdopen can't fail. */
|
||||
close (pdes[1]);
|
||||
scb->fd = pdes[0];
|
||||
scb->ttystate = NULL;
|
||||
#endif
|
||||
|
||||
/* Make it non-blocking */
|
||||
{
|
||||
int flags = fcntl (scb->fd, F_GETFL, 0);
|
||||
if (fcntl (scb->fd, F_SETFL, flags | O_NONBLOCK) < 0)
|
||||
{
|
||||
perror ("ser-pipe");
|
||||
pipe_close (scb);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
/* If we don't do this, GDB simply exits when the remote side dies. */
|
||||
signal (SIGPIPE, SIG_IGN);
|
||||
return 0;
|
||||
#endif
|
||||
}
|
||||
|
||||
static serial_ttystate
|
||||
pipe_get_tty_state (scb)
|
||||
serial_t scb;
|
||||
{
|
||||
/* return garbage */
|
||||
return xmalloc (sizeof (int));
|
||||
}
|
||||
|
||||
static int
|
||||
pipe_set_tty_state (scb, ttystate)
|
||||
serial_t scb;
|
||||
serial_ttystate ttystate;
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
pipe_return_0 (scb)
|
||||
serial_t scb;
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
pipe_raw (scb)
|
||||
serial_t scb;
|
||||
{
|
||||
return; /* Always in raw mode */
|
||||
}
|
||||
|
||||
/* Wait for input on scb, with timeout seconds. Returns 0 on success,
|
||||
otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
|
||||
|
||||
For termio{s}, we actually just setup VTIME if necessary, and let the
|
||||
timeout occur in the read() in pipe_read().
|
||||
*/
|
||||
|
||||
static int
|
||||
wait_for (scb, timeout)
|
||||
serial_t scb;
|
||||
int timeout;
|
||||
{
|
||||
int numfds;
|
||||
struct timeval tv;
|
||||
fd_set readfds, exceptfds;
|
||||
|
||||
FD_ZERO (&readfds);
|
||||
FD_ZERO (&exceptfds);
|
||||
|
||||
tv.tv_sec = timeout;
|
||||
tv.tv_usec = 0;
|
||||
|
||||
FD_SET (scb->fd, &readfds);
|
||||
FD_SET (scb->fd, &exceptfds);
|
||||
|
||||
while (1)
|
||||
{
|
||||
if (timeout >= 0)
|
||||
numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, &tv);
|
||||
else
|
||||
numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, 0);
|
||||
|
||||
if (numfds <= 0)
|
||||
{
|
||||
if (numfds == 0)
|
||||
return SERIAL_TIMEOUT;
|
||||
else if (errno == EINTR)
|
||||
continue;
|
||||
else
|
||||
return SERIAL_ERROR; /* Got an error from select or poll */
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
/* Read a character with user-specified timeout. TIMEOUT is number of seconds
|
||||
to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
|
||||
char if successful. Returns -2 if timeout expired, EOF if line dropped
|
||||
dead, or -3 for any other error (see errno in that case). */
|
||||
|
||||
static int
|
||||
pipe_readchar (scb, timeout)
|
||||
serial_t scb;
|
||||
int timeout;
|
||||
{
|
||||
int status;
|
||||
int delta;
|
||||
|
||||
if (scb->bufcnt-- > 0)
|
||||
return *scb->bufp++;
|
||||
|
||||
/* We have to be able to keep the GUI alive here, so we break the original
|
||||
timeout into steps of 1 second, running the "keep the GUI alive" hook
|
||||
each time through the loop.
|
||||
|
||||
Also, timeout = 0 means to poll, so we just set the delta to 0, so we
|
||||
will only go through the loop once. */
|
||||
|
||||
delta = (timeout == 0 ? 0 : 1);
|
||||
while (1)
|
||||
{
|
||||
|
||||
/* N.B. The UI may destroy our world (for instance by calling
|
||||
remote_stop,) in which case we want to get out of here as
|
||||
quickly as possible. It is not safe to touch scb, since
|
||||
someone else might have freed it. The ui_loop_hook signals that
|
||||
we should exit by returning 1. */
|
||||
|
||||
if (ui_loop_hook)
|
||||
{
|
||||
if (ui_loop_hook (0))
|
||||
return SERIAL_TIMEOUT;
|
||||
}
|
||||
|
||||
status = wait_for (scb, delta);
|
||||
timeout -= delta;
|
||||
|
||||
/* If we got a character or an error back from wait_for, then we can
|
||||
break from the loop before the timeout is completed. */
|
||||
|
||||
if (status != SERIAL_TIMEOUT)
|
||||
{
|
||||
break;
|
||||
}
|
||||
|
||||
/* If we have exhausted the original timeout, then generate
|
||||
a SERIAL_TIMEOUT, and pass it out of the loop. */
|
||||
|
||||
else if (timeout == 0)
|
||||
{
|
||||
status == SERIAL_TIMEOUT;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (status < 0)
|
||||
return status;
|
||||
|
||||
while (1)
|
||||
{
|
||||
scb->bufcnt = read (scb->fd, scb->buf, BUFSIZ);
|
||||
if (scb->bufcnt != -1 || errno != EINTR)
|
||||
break;
|
||||
}
|
||||
|
||||
if (scb->bufcnt <= 0)
|
||||
{
|
||||
if (scb->bufcnt == 0)
|
||||
return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
|
||||
distinguish between EOF & timeouts
|
||||
someday] */
|
||||
else
|
||||
return SERIAL_ERROR; /* Got an error from read */
|
||||
}
|
||||
|
||||
scb->bufcnt--;
|
||||
scb->bufp = scb->buf;
|
||||
return *scb->bufp++;
|
||||
}
|
||||
|
||||
static int
|
||||
pipe_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
|
||||
serial_t scb;
|
||||
serial_ttystate new_ttystate;
|
||||
serial_ttystate old_ttystate;
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
pipe_print_tty_state (scb, ttystate)
|
||||
serial_t scb;
|
||||
serial_ttystate ttystate;
|
||||
{
|
||||
/* Nothing to print. */
|
||||
return;
|
||||
}
|
||||
|
||||
static int
|
||||
pipe_setbaudrate (scb, rate)
|
||||
serial_t scb;
|
||||
int rate;
|
||||
{
|
||||
return 0; /* Never fails! */
|
||||
}
|
||||
|
||||
static int
|
||||
pipe_setstopbits (scb, num)
|
||||
serial_t scb;
|
||||
int num;
|
||||
{
|
||||
return 0; /* Never fails! */
|
||||
}
|
||||
|
||||
static int
|
||||
pipe_write (scb, str, len)
|
||||
serial_t scb;
|
||||
const char *str;
|
||||
int len;
|
||||
{
|
||||
int cc;
|
||||
|
||||
while (len > 0)
|
||||
{
|
||||
cc = write (scb->fd, str, len);
|
||||
|
||||
if (cc < 0)
|
||||
return 1;
|
||||
len -= cc;
|
||||
str += cc;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void
|
||||
pipe_close (scb)
|
||||
serial_t scb;
|
||||
{
|
||||
if (scb->fd < 0)
|
||||
return;
|
||||
if (scb->ttystate != NULL)
|
||||
pclose ((FILE *) scb->ttystate);
|
||||
else
|
||||
close (scb->fd);
|
||||
scb->ttystate = NULL;
|
||||
scb->fd = -1;
|
||||
}
|
||||
|
||||
static struct serial_ops pipe_ops =
|
||||
{
|
||||
"pipe",
|
||||
0,
|
||||
pipe_open,
|
||||
pipe_close,
|
||||
pipe_readchar,
|
||||
pipe_write,
|
||||
pipe_return_0, /* flush output */
|
||||
pipe_return_0, /* flush input */
|
||||
pipe_return_0, /* send break */
|
||||
pipe_raw,
|
||||
pipe_get_tty_state,
|
||||
pipe_set_tty_state,
|
||||
pipe_print_tty_state,
|
||||
pipe_noflush_set_tty_state,
|
||||
pipe_setbaudrate,
|
||||
pipe_setstopbits,
|
||||
pipe_return_0, /* wait for output to drain */
|
||||
};
|
||||
|
||||
void
|
||||
_initialize_ser_pipe ()
|
||||
{
|
||||
serial_add_interface (&pipe_ops);
|
||||
}
|
||||
Reference in New Issue
Block a user