src/libstatgrab/user_stats.c

/*
 * i-scream central monitoring system
 * http://www.i-scream.org
 * Copyright (C) 2000-2004 i-scream
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; 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 "statgrab.h"
#ifdef ALLBSD
#include <sys/types.h>
#endif
#include <utmp.h>

#ifdef SOLARIS
#define MAX_LOGIN_NAME_SIZE 8
#endif
#if defined(LINUX) || defined(FREEBSD)
#define MAX_LOGIN_NAME_SIZE UT_NAMESIZE
#endif
#ifdef NETBSD
#define MAX_LOGIN_NAME_SIZE _POSIX_LOGIN_NAME_MAX
#endif
#if defined(CYGWIN)
#define MAX_LOGIN_NAME_SIZE _SC_LOGIN_NAME_MAX
#endif

#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;
#if defined(SOLARIS) || defined(LINUX) || defined(CYGWIN)
        struct utmp *entry;
#endif
#ifdef ALLBSD
        struct utmp entry;
        FILE *f;
#endif

        /* 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;
        }       

        /* Essentially blank the list, or give it a inital starting string */
        strcpy(user_stats.name_list, "");

#if defined(SOLARIS) || defined(LINUX) || defined(CYGWIN)
        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));
                                if(user_stats.name_list==NULL){
                                        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();
#endif
#ifdef ALLBSD
        if ((f=fopen(_PATH_UTMP, "r")) == NULL){
                return NULL;
        }
        while((fread(&entry, sizeof(entry),1,f)) != 0){
                if (entry.ut_name[0] == '\0') continue;
                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));
                        if(user_stats.name_list==NULL){
                                user_stats.name_list=tmp;
                                return NULL;
                        }
                        size_of_namelist=1+(size_of_namelist*2);
                        
                }
                strncat(user_stats.name_list, entry.ut_name, MAX_LOGIN_NAME_SIZE);
                strcat(user_stats.name_list, " ");
                num_users++;
        }
        fclose(f);

#endif  
        /* We want to remove the last " " */
        if(num_users!=0){
                tmp=strrchr(user_stats.name_list, ' ');
                if(tmp!=NULL){
                        *tmp='\0';
                        user_stats.num_entries=num_users;
                }
        }

        return &user_stats;

}
Revision:	1.14
Committed:	Fri Jan 16 15:54:54 2004 UTC (20 years, 4 months ago) by tdb
Content type:	text/plain
Branch:	MAIN
Changes since 1.13:	+13 -12 lines
Log Message:	Alter the licensing of libstatgrab. The library part is now under the LGPL, whilst the tools/examples are under the GPL. Both licenses are included in the distribution (and are both now in CVS). Also made a minor alteration to the webpage where it said everything was licensed under the GPL.
#	User	Rev	Content
1	tdb	1.14	/*
2	pajs	1.1	* i-scream central monitoring system
3	tdb	1.9	* http://www.i-scream.org
4	tdb	1.14	* Copyright (C) 2000-2004 i-scream
5	pajs	1.1	*
6	tdb	1.14	* This library is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU Lesser General Public
8			* License as published by the Free Software Foundation; either
9			* version 2.1 of the License, or (at your option) any later version.
10	pajs	1.1	*
11	tdb	1.14	* This library is distributed in the hope that it will be useful,
12	pajs	1.1	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	tdb	1.14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14			* Lesser General Public License for more details.
15	pajs	1.1	*
16	tdb	1.14	* You should have received a copy of the GNU Lesser General Public
17			* License along with this library; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19			* 02111-1307 USA
20	pajs	1.1	*/
21
22			#ifdef HAVE_CONFIG_H
23			#include "config.h"
24			#endif
25	tdb	1.3
26	pajs	1.1	#include <stdlib.h>
27			#include <stdio.h>
28			#include <string.h>
29	pajs	1.8	#include "statgrab.h"
30	ats	1.10	#ifdef ALLBSD
31	pajs	1.8	#include <sys/types.h>
32			#endif
33	pajs	1.1	#include <utmp.h>
34
35	pajs	1.13	#ifdef SOLARIS
36			#define MAX_LOGIN_NAME_SIZE 8
37			#endif
38			#if defined(LINUX) \|\| defined(FREEBSD)
39			#define MAX_LOGIN_NAME_SIZE UT_NAMESIZE
40			#endif
41			#ifdef NETBSD
42			#define MAX_LOGIN_NAME_SIZE _POSIX_LOGIN_NAME_MAX
43			#endif
44			#if defined(CYGWIN)
45			#define MAX_LOGIN_NAME_SIZE _SC_LOGIN_NAME_MAX
46			#endif
47
48	pajs	1.5	#define START_VAL (5*(1+MAX_LOGIN_NAME_SIZE))
49	pajs	1.1
50			user_stat_t *get_user_stats(){
51			int num_users=0;
52
53	pajs	1.5	static user_stat_t user_stats;
54			static int size_of_namelist=-1;
55			char *tmp;
56	ats	1.12	#if defined(SOLARIS) \|\| defined(LINUX) \|\| defined(CYGWIN)
57	pajs	1.1	struct utmp *entry;
58	pajs	1.8	#endif
59	ats	1.10	#ifdef ALLBSD
60	pajs	1.8	struct utmp entry;
61			FILE *f;
62			#endif
63	pajs	1.1
64			/* First case call */
65	pajs	1.5	if (size_of_namelist==-1){
66			user_stats.name_list=malloc(START_VAL);
67			if(user_stats.name_list==NULL){
68	pajs	1.1	return NULL;
69			}
70	pajs	1.5	size_of_namelist=START_VAL;
71	pajs	1.1	}
72
73	pajs	1.5	/* Essentially blank the list, or give it a inital starting string */
74			strcpy(user_stats.name_list, "");
75	pajs	1.8
76	ats	1.12	#if defined(SOLARIS) \|\| defined(LINUX) \|\| defined(CYGWIN)
77	pajs	1.1	setutent();
78			while((entry=getutent()) != NULL) {
79			if(entry->ut_type==USER_PROCESS) {
80	pajs	1.5	if((strlen(user_stats.name_list)+MAX_LOGIN_NAME_SIZE+2) > size_of_namelist){
81			tmp=user_stats.name_list;
82			user_stats.name_list=realloc(user_stats.name_list, 1+(size_of_namelist*2));
83			if(user_stats.name_list==NULL){
84			user_stats.name_list=tmp;
85	pajs	1.1	return NULL;
86			}
87	pajs	1.5	size_of_namelist=1+(size_of_namelist*2);
88	pajs	1.1	}
89
90	pajs	1.5	strncat(user_stats.name_list, entry->ut_user, MAX_LOGIN_NAME_SIZE);
91			strcat(user_stats.name_list, " ");
92	pajs	1.1	num_users++;
93			}
94			}
95			endutent();
96	pajs	1.8	#endif
97	ats	1.10	#ifdef ALLBSD
98	pajs	1.8	if ((f=fopen(_PATH_UTMP, "r")) == NULL){
99			return NULL;
100			}
101			while((fread(&entry, sizeof(entry),1,f)) != 0){
102			if (entry.ut_name[0] == '\0') continue;
103			if((strlen(user_stats.name_list)+MAX_LOGIN_NAME_SIZE+2) > size_of_namelist){
104			tmp=user_stats.name_list;
105			user_stats.name_list=realloc(user_stats.name_list, 1+(size_of_namelist*2));
106			if(user_stats.name_list==NULL){
107			user_stats.name_list=tmp;
108			return NULL;
109			}
110			size_of_namelist=1+(size_of_namelist*2);
111
112			}
113			strncat(user_stats.name_list, entry.ut_name, MAX_LOGIN_NAME_SIZE);
114			strcat(user_stats.name_list, " ");
115			num_users++;
116			}
117			fclose(f);
118	pajs	1.1
119	pajs	1.8	#endif
120	pajs	1.5	/* We want to remove the last " " */
121	pajs	1.7	if(num_users!=0){
122			tmp=strrchr(user_stats.name_list, ' ');
123			if(tmp!=NULL){
124			*tmp='\0';
125			user_stats.num_entries=num_users;
126			}
127			}
128	pajs	1.5
129			return &user_stats;
130	pajs	1.1
131			}