NetBSD/gnu/dist/gdb/callback.c

350 lines
5.8 KiB
C

/* Host callback routines for GDB.
Copyright 1995 Free Software Foundation, Inc.
Contributed by Cygnus Support.
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. */
/* This file provides a standard way for targets to talk to the host OS
level.
This interface will probably need a bit more banging to make it
smooth. Currently the simulator uses this file to provide the
callbacks for itself when it's built standalone, which is rather
ugly. */
#ifndef INSIDE_SIMULATOR
#include "defs.h"
#endif
#include "ansidecl.h"
#include "callback.h"
#ifdef ANSI_PROTOTYPES
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>
/* Set the callback copy of errno from what we see now. */
static int
wrap (p, val)
host_callback *p;
int val;
{
p->last_errno = errno;
return val;
}
/* Make sure the FD provided is ok. If not, return non-zero
and set errno. */
static int
fdbad (p, fd)
host_callback *p;
int fd;
{
if (fd < 0 || fd > MAX_CALLBACK_FDS || !p->fdopen[fd])
{
p->last_errno = EINVAL;
return -1;
}
return 0;
}
static int
fdmap (p, fd)
host_callback *p;
int fd;
{
return p->fdmap[fd];
}
int
os_close (p, fd)
host_callback *p;
int fd;
{
int result;
result = fdbad (p, fd);
if (result)
return result;
result = wrap (p, close (fdmap (p, fd)));
return result;
}
int
os_get_errno (p)
host_callback *p;
{
/* !!! fixme, translate from host to taget errno value */
return p->last_errno;
}
int
os_isatty (p, fd)
host_callback *p;
int fd;
{
int result;
result = fdbad (p, fd);
if (result)
return result;
result = wrap (p, isatty (fdmap (fd)));
return result;
}
int
os_lseek (p, fd, off, way)
host_callback *p;
int fd;
long off;
int way;
{
int result;
result = fdbad (p, fd);
if (result)
return result;
result = lseek (fdmap (p, fd), off, way);
return result;
}
int
os_open (p, name, flags)
host_callback *p;
const char *name;
int flags;
{
int i;
for (i = 0; i < MAX_CALLBACK_FDS; i++)
{
if (!p->fdopen[i])
{
int f = open (name, flags);
if (f < 0)
{
p->last_errno = errno;
return f;
}
p->fdopen[i] = 1;
p->fdmap[i] = f;
return i;
}
}
p->last_errno = EMFILE;
return -1;
}
int
os_read (p, fd, buf, len)
host_callback *p;
int fd;
char *buf;
int len;
{
int result;
result = fdbad (p, fd);
if (result)
return result;
result = wrap (p, read (fdmap (p, fd), buf, len));
return result;
}
int
os_read_stdin (p, buf, len)
host_callback *p;
char *buf;
int len;
{
return wrap (p, read (0, buf, len));
}
int
os_write (p, fd, buf, len)
host_callback *p;
int fd;
const char *buf;
int len;
{
int result;
result = fdbad (p, fd);
if (result)
return result;
result = wrap (p, write (fdmap (p, fd), buf, len));
return result;
}
/* ignore the grossness of INSIDE_SIMULATOR, it will go away one day. */
int
os_write_stdout (p, buf, len)
host_callback *p;
const char *buf;
int len;
{
#ifdef INSIDE_SIMULATOR
return os_write (p, 1, buf, len);
#else
int i;
char b[2];
for (i = 0; i< len; i++)
{
b[0] = buf[i];
b[1] = 0;
if (target_output_hook)
target_output_hook (b);
else
fputs_filtered (b, gdb_stdout);
}
return len;
#endif
}
int
os_rename (p, f1, f2)
host_callback *p;
const char *f1;
const char *f2;
{
return wrap (p, rename (f1, f2));
}
int
os_system (p, s)
host_callback *p;
const char *s;
{
return wrap (p, system (s));
}
long
os_time (p, t)
host_callback *p;
long *t;
{
return wrap (p, time (t));
}
int
os_unlink (p, f1)
host_callback *p;
const char *f1;
{
return wrap (p, unlink (f1));
}
int
os_shutdown (p)
host_callback *p;
{
int i;
for (i = 0; i < MAX_CALLBACK_FDS; i++)
{
if (p->fdopen[i] && !p->alwaysopen[i]) {
close (p->fdmap[i]);
p->fdopen[i] = 0;
}
}
return 1;
}
int os_init(p)
host_callback *p;
{
int i;
os_shutdown (p);
for (i= 0; i < 3; i++)
{
p->fdmap[i] = i;
p->fdopen[i] = 1;
p->alwaysopen[i] = 1;
}
return 1;
}
/* !!fixme!!
This bit is ugly. When the interface has settled down I'll
move the whole file into sim/common and remove this bit. */
/* VARARGS */
void
#ifdef ANSI_PROTOTYPES
os_printf_filtered (host_callback *p, const char *format, ...)
#else
os_printf_filtered (p, va_alist)
host_callback *p;
va_dcl
#endif
{
va_list args;
#ifdef ANSI_PROTOTYPES
va_start (args, format);
#else
char *format;
va_start (args);
format = va_arg (args, char *);
#endif
#ifdef INSIDE_SIMULATOR
vprintf (format, args);
#else
vfprintf_filtered (stdout, format, args);
#endif
va_end (args);
}
host_callback default_callback =
{
os_close,
os_get_errno,
os_isatty,
os_lseek,
os_open,
os_read,
os_read_stdin,
os_rename,
os_system,
os_time,
os_unlink,
os_write,
os_write_stdout,
os_shutdown,
os_init,
os_printf_filtered,
0, /* last errno */
};