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/* $Id: init.c,v 1.17 1999/02/23 11:43:33 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/xmalloc.h>
#include <glibtop/sysdeps.h>
#include <glibtop/parameter.h>
#ifndef DEFAULT_PORT
#define DEFAULT_PORT 42800
#endif
static glibtop _glibtop_global_server;
glibtop *glibtop_global_server = &_glibtop_global_server;
static void
_init_server (glibtop *server, const unsigned features)
{
char *command, *temp;
/* Try to get server command, but don't override if already
* set via glibtop_set_parameter () */
if (server->server_command == NULL) {
const char *temp = getenv ("LIBGTOP_SERVER") ?
getenv ("LIBGTOP_SERVER") : LIBGTOP_SERVER;
server->server_command = glibtop_strdup_r (server, temp);
}
if (server->server_rsh == NULL) {
const char *temp = getenv ("LIBGTOP_RSH") ?
getenv ("LIBGTOP_RSH") : "/usr/bin/ssh";
server->server_rsh = glibtop_strdup_r (server, temp);
}
/* Try to get server method, but don't override if already
* set via glibtop_set_parameter () */
if (server->method) return;
/* If server->command doesn't start with a colon, then it is
* the full pathname of the server executable. */
if (server->server_command [0] != ':') {
if (features & glibtop_server_features) {
/* We really need the server. */
server->method = GLIBTOP_METHOD_PIPE;
} else {
/* Fine. No server is needed, so we call the
* sysdeps functions directly. */
server->method = GLIBTOP_METHOD_DIRECT;
}
return;
}
/* If the first character of 'server_command' is a colon,
* the first field is the method to connect to the server. */
/* Everything up to the next colon is the method. */
command = glibtop_strdup_r (server, server->server_command+1);
temp = strstr (command, ":");
if (temp) *temp = 0;
/* Dispatch method. */
if (!strcmp (command, "direct")) {
/* Use sysdeps dir instead of connecting to server
* even if using the server would be required on
* the current system. */
server->method = GLIBTOP_METHOD_DIRECT;
} else if (!strcmp (command, "inet")) {
server->method = GLIBTOP_METHOD_INET;
/* Connect to internet server. */
if (temp == NULL) {
/* If no value was set, we use 'localhost'. */
if (server->server_host == NULL)
server->server_host = glibtop_strdup_r
(server, "localhost");
} else {
char *temp2 = strstr (temp+1, ":");
if (temp2) *temp2 = 0;
/* Override default. */
if (server->server_host)
glibtop_free_r (server,
(char *) server->server_host);
server->server_host = glibtop_strdup_r
(server, temp+1);
temp = temp2;
}
if (temp == NULL) {
/* If no value was set, we use DEFAULT_PORT. */
if (server->server_port == 0)
server->server_port = DEFAULT_PORT;
} else {
char *temp2 = strstr (temp+1, ":");
if (temp2) *temp2 = 0;
if (sscanf (temp+1, "%ld", &server->server_port) != 1)
server->server_port = DEFAULT_PORT;
temp = temp2 ? temp2 + 1 : temp2;
}
} else if (!strcmp (command, "unix")) {
/* Connect to unix domain socket. */
server->method = GLIBTOP_METHOD_UNIX;
} else if (!strcmp (command, "pipe")) {
/* Open pipe to server. */
server->method = GLIBTOP_METHOD_PIPE;
} else {
glibtop_error_r (server, "Unknown server method '%s'",
server->server_command+1);
}
glibtop_free_r (server, command);
}
glibtop *
glibtop_init_r (glibtop **server_ptr, unsigned long features, unsigned flags)
{
glibtop *server;
if (server_ptr == NULL)
return NULL;
if (*server_ptr == NULL)
*server_ptr = glibtop_global_server;
server = *server_ptr;
/* Should we do the initialization? */
if (flags & GLIBTOP_INIT_NO_INIT)
return server;
/* Do the initialization, but only if not already initialized. */
if ((server->flags & _GLIBTOP_INIT_STATE_INIT) == 0) {
if (flags & GLIBTOP_FEATURES_EXCEPT)
features = ~features & GLIBTOP_SYSDEPS_ALL;
if (features == 0)
features = GLIBTOP_SYSDEPS_ALL;
if (flags & GLIBTOP_FEATURES_NO_SERVER) {
server->method = GLIBTOP_METHOD_DIRECT;
features = 0;
}
server->features = features;
_init_server (server, features);
server->flags |= _GLIBTOP_INIT_STATE_INIT;
switch (server->method) {
case GLIBTOP_METHOD_PIPE:
case GLIBTOP_METHOD_UNIX:
if (glibtop_server_features & features)
break;
server->method = GLIBTOP_METHOD_DIRECT;
break;
}
}
/* Should we open the server? */
if (flags & GLIBTOP_INIT_NO_OPEN)
return server;
/* Open server, but only if not already opened. */
if ((server->flags & _GLIBTOP_INIT_STATE_OPEN) == 0)
glibtop_open_l (glibtop_global_server, "glibtop",
features, flags);
return server;
}
glibtop *
glibtop_init_s (glibtop **server_ptr, unsigned long features, unsigned flags)
{
glibtop *server;
glibtop_init_func_t *init_fkt;
if (server_ptr == NULL)
return NULL;
if (*server_ptr == NULL)
*server_ptr = glibtop_global_server;
server = *server_ptr;
/* Should we do the initialization? */
if (flags & GLIBTOP_INIT_NO_INIT)
return server;
/* Do the initialization, but only if not already initialized. */
if ((server->flags & _GLIBTOP_INIT_STATE_SYSDEPS) == 0) {
glibtop_open_s (server, "glibtop", features, flags);
for (init_fkt = _glibtop_init_hook_s; *init_fkt; init_fkt++)
(*init_fkt) (server);
server->flags |= _GLIBTOP_INIT_STATE_SYSDEPS;
}
return server;
}
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