read_data.c

linux 操作系统下对系统资源监控程序的编写

/* $Id: read_data.c,v 1.16 2004/03/04 15:29:12 hadess Exp $ */

/* Copyright (C) 1998-99 Martin Baulig
   This file is part of LibGTop 1.0.

   Contributed by Martin Baulig <[e-mail]>, 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 <config.h>

#include <glibtop/read_data.h>
#include "libgtop-i18n.h"

/* Reads some data from server. */

void *
glibtop_read_data_l (glibtop *server)
{
	size_t size;
	void *ptr;
	int ret;

	glibtop_init_r (&server, 0, 0);

#ifdef DEBUG
	fprintf (stderr, "LIBRARY: reading %d data bytes.\n", sizeof (size_t));
#endif

	if (server->socket) {
		ret = recv (server->socket, (void *)&size, sizeof (size_t), 0);
	} else {
		ret = read (server->input [0], (void *)&size, sizeof (size_t));
	}

	if (ret < 0)
		glibtop_error_io_r (server, _("read data size"));

#ifdef DEBUG
	fprintf (stderr, "LIBRARY: really reading %d data bytes (ret = %d).\n", size, ret);
#endif

	if (!size) return NULL;	

	ptr = g_malloc (size);
	
	if (server->socket) {
		ret = recv (server->socket, ptr, size, 0);
	} else {
		ret = read (server->input [0], ptr, size);
	}

	if (ret < 0)
		glibtop_error_io_r (server, ngettext ("read data %d byte", "read data %d bytes", size));

	return ptr;
}