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/* $Id: open.c,v 1.29 1999/02/23 11:43:34 martin Exp $ */
/* Copyright (C) 1998-99 Martin Baulig
This file is part of LibGTop 1.0.
Contributed by Martin Baulig <martin@home-of-linux.org>, April 1998.
LibGTop 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.
LibGTop 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 LibGTop; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include <glibtop.h>
#include <glibtop/open.h>
#include <glibtop/version.h>
#include <glibtop/sysdeps.h>
#include <glibtop/command.h>
#include <glibtop/xmalloc.h>
#include <glibtop/gnuserv.h>
/* Opens pipe to gtop server. Returns 0 on success and -1 on error. */
void
glibtop_open_l (glibtop *server, const char *program_name,
const unsigned long features, const unsigned flags)
{
int connect_type;
server->name = program_name;
/* It is important to set _GLIBTOP_INIT_STATE_OPEN here when we
* do recursive calls to glibtop_init_r (). */
server->flags |= _GLIBTOP_INIT_STATE_OPEN;
server->error_method = GLIBTOP_ERROR_METHOD_DEFAULT;
#ifdef DEBUG
fprintf (stderr, "SIZEOF: %u - %u - %u - %u - %u - %u\n",
sizeof (glibtop_command), sizeof (glibtop_response),
sizeof (glibtop_mountentry), sizeof (glibtop_union),
sizeof (glibtop_sysdeps), sizeof (glibtop_response_union));
#endif
switch (server->method) {
case GLIBTOP_METHOD_DIRECT:
server->features = 0;
break;
case GLIBTOP_METHOD_INET:
#ifdef DEBUG
fprintf (stderr, "Connecting to '%s' port %ld.\n",
server->server_host, server->server_port);
#endif
connect_type = glibtop_make_connection
(server->server_host, server->server_port,
&server->socket);
#ifdef DEBUG
fprintf (stderr, "Connect Type is %d.\n", connect_type);
#endif
server->flags |= _GLIBTOP_INIT_STATE_SERVER;
server->features = -1;
break;
case GLIBTOP_METHOD_UNIX:
#ifdef DEBUG
fprintf (stderr, "Connecting to Unix Domain Socket.\n");
#endif
connect_type = glibtop_make_connection
("unix", 0, &server->socket);
#ifdef DEBUG
fprintf (stderr, "Connect Type is %d.\n", connect_type);
#endif
server->flags |= _GLIBTOP_INIT_STATE_SERVER;
server->features = -1;
break;
case GLIBTOP_METHOD_PIPE:
#ifdef DEBUG
fprintf (stderr, "Opening pipe to server (%s).\n",
LIBGTOP_SERVER);
#endif
if (pipe (server->input) || pipe (server->output))
glibtop_error_io_r (server, "cannot make a pipe");
server->pid = fork ();
if (server->pid < 0) {
glibtop_error_io_r (server, "fork failed");
} else if (server->pid == 0) {
close (0); close (1);
close (server->input [0]); close (server->output [1]);
dup2 (server->input [1], 1);
dup2 (server->output [0], 0);
execl (LIBGTOP_SERVER, "libgtop-server", NULL);
glibtop_error_io_r (server, "execl (%s)",
LIBGTOP_SERVER);
_exit (2);
}
close (server->input [1]);
close (server->output [0]);
server->flags |= _GLIBTOP_INIT_STATE_SERVER;
server->features = -1;
break;
}
/* If the server has been started, ask it for its features. */
if (server->flags & _GLIBTOP_INIT_STATE_SERVER) {
char version [BUFSIZ], buffer [BUFSIZ];
glibtop_sysdeps sysdeps;
size_t size, nbytes;
/* First check whether the server version is correct. */
sprintf (version, LIBGTOP_VERSION_STRING,
LIBGTOP_VERSION, LIBGTOP_SERVER_VERSION,
sizeof (glibtop_command),
sizeof (glibtop_response),
sizeof (glibtop_union),
sizeof (glibtop_sysdeps));
size = strlen (version) + 1;
glibtop_read_l (server, sizeof (nbytes), &nbytes);
if (nbytes != size)
glibtop_error_r (server,
"Requested %u bytes but got %u.",
size, nbytes);
glibtop_read_l (server, nbytes, buffer);
if (memcmp (version, buffer, size))
glibtop_error_r (server, "server version is not %s",
LIBGTOP_VERSION);
/* Now ask it for its features. */
glibtop_call_l (server, GLIBTOP_CMND_SYSDEPS, 0, NULL,
sizeof (glibtop_sysdeps), &sysdeps);
server->features = sysdeps.features;
memcpy (&server->sysdeps, &sysdeps, sizeof (glibtop_sysdeps));
#ifdef DEBUG
fprintf (stderr, "Server features are %lu.\n",
server->features);
#endif
}
/* In any case, we call the open functions of our own sysdeps
* directory. */
#ifdef DEBUG
fprintf (stderr, "Calling sysdeps open function.\n");
#endif
glibtop_init_s (&server, features, flags);
}
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