src/libstatgrab/user_stats.c

/* 
 * i-scream central monitoring system
 * http://www.i-scream.org.uk
 * Copyright (C) 2000-2002 i-scream
 * 
 * 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <utmp.h>
#include "statgrab.h"

#define START_VAL (5*(1+MAX_LOGIN_NAME_SIZE))

user_stat_t *get_user_stats(){
        int num_users=0;

        static user_stat_t user_stats;
        static int size_of_namelist=-1;
        char *tmp;
        struct utmp *entry;

        /* First case call */
        if (size_of_namelist==-1){
                user_stats.name_list=malloc(START_VAL);
                if(user_stats.name_list==NULL){
                        return NULL;
                }
                size_of_namelist=START_VAL;
                printf("Initially started at %d\n", size_of_namelist);
        }       

        /* Essentially blank the list, or give it a inital starting string */
        strcpy(user_stats.name_list, "");
        setutent();
        while((entry=getutent()) != NULL) {
                if(entry->ut_type==USER_PROCESS) {
                        if((strlen(user_stats.name_list)+MAX_LOGIN_NAME_SIZE+2) > size_of_namelist){
                                tmp=user_stats.name_list;
                                user_stats.name_list=realloc(user_stats.name_list, 1+(size_of_namelist*2));
                                printf("realloc to %d\n", 1+(size_of_namelist*2));
                                if(user_stats.name_list==NULL){
                                        printf("realloc failed\n");
                                        user_stats.name_list=tmp;
                                        return NULL;
                                }
                                size_of_namelist=1+(size_of_namelist*2);
                        }

                        strncat(user_stats.name_list, entry->ut_user, MAX_LOGIN_NAME_SIZE);
                        strcat(user_stats.name_list, " ");
                        num_users++;
                }
        }
        endutent();

        /* We want to remove the last " " */
        tmp=strrchr(user_stats.name_list, ' ');
        *tmp='\0';
        user_stats.num_entries=num_users;

        return &user_stats;

}
Revision:	1.5
Committed:	Sat Mar 1 15:01:01 2003 UTC (21 years, 2 months ago) by pajs
Content type:	text/plain
Branch:	MAIN
Changes since 1.4:	+27 -21 lines
Log Message:	changed user_stats to return something more useful for ihost, and prob something more useful to everyone else too. Although, they can't just itterate thru it now, they got to find ' ' :)
#	Content
1	/*
2	* i-scream central monitoring system
3	* http://www.i-scream.org.uk
4	* Copyright (C) 2000-2002 i-scream
5	*
6	* This program is free software; you can redistribute it and/or
7	* modify it under the terms of the GNU General Public License
8	* as published by the Free Software Foundation; either version 2
9	* of the License, or (at your option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with this program; if not, write to the Free Software
18	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19	*/
20
21	#ifdef HAVE_CONFIG_H
22	#include "config.h"
23	#endif
24
25	#include <stdlib.h>
26	#include <stdio.h>
27	#include <string.h>
28	#include <utmp.h>
29	#include "statgrab.h"
30
31	#define START_VAL (5*(1+MAX_LOGIN_NAME_SIZE))
32
33	user_stat_t *get_user_stats(){
34	int num_users=0;
35
36	static user_stat_t user_stats;
37	static int size_of_namelist=-1;
38	char *tmp;
39	struct utmp *entry;
40
41	/* First case call */
42	if (size_of_namelist==-1){
43	user_stats.name_list=malloc(START_VAL);
44	if(user_stats.name_list==NULL){
45	return NULL;
46	}
47	size_of_namelist=START_VAL;
48	printf("Initially started at %d\n", size_of_namelist);
49	}
50
51	/* Essentially blank the list, or give it a inital starting string */
52	strcpy(user_stats.name_list, "");
53	setutent();
54	while((entry=getutent()) != NULL) {
55	if(entry->ut_type==USER_PROCESS) {
56	if((strlen(user_stats.name_list)+MAX_LOGIN_NAME_SIZE+2) > size_of_namelist){
57	tmp=user_stats.name_list;
58	user_stats.name_list=realloc(user_stats.name_list, 1+(size_of_namelist*2));
59	printf("realloc to %d\n", 1+(size_of_namelist*2));
60	if(user_stats.name_list==NULL){
61	printf("realloc failed\n");
62	user_stats.name_list=tmp;
63	return NULL;
64	}
65	size_of_namelist=1+(size_of_namelist*2);
66	}
67
68	strncat(user_stats.name_list, entry->ut_user, MAX_LOGIN_NAME_SIZE);
69	strcat(user_stats.name_list, " ");
70	num_users++;
71	}
72	}
73	endutent();
74
75	/* We want to remove the last " " */
76	tmp=strrchr(user_stats.name_list, ' ');
77	*tmp='\0';
78	user_stats.num_entries=num_users;
79
80	return &user_stats;
81
82	}