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.
#	Content
1	/*
2	* i-scream central monitoring system
3	* http://www.i-scream.org
4	* Copyright (C) 2000-2004 i-scream
5	*
6	* 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	*
11	* This library 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 GNU
14	* Lesser General Public License for more details.
15	*
16	* 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	*/
21
22	#ifdef HAVE_CONFIG_H
23	#include "config.h"
24	#endif
25
26	#include <stdlib.h>
27	#include <stdio.h>
28	#include <string.h>
29	#include "statgrab.h"
30	#ifdef ALLBSD
31	#include <sys/types.h>
32	#endif
33	#include <utmp.h>
34
35	#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	#define START_VAL (5*(1+MAX_LOGIN_NAME_SIZE))
49
50	user_stat_t *get_user_stats(){
51	int num_users=0;
52
53	static user_stat_t user_stats;
54	static int size_of_namelist=-1;
55	char *tmp;
56	#if defined(SOLARIS) \|\| defined(LINUX) \|\| defined(CYGWIN)
57	struct utmp *entry;
58	#endif
59	#ifdef ALLBSD
60	struct utmp entry;
61	FILE *f;
62	#endif
63
64	/* First case call */
65	if (size_of_namelist==-1){
66	user_stats.name_list=malloc(START_VAL);
67	if(user_stats.name_list==NULL){
68	return NULL;
69	}
70	size_of_namelist=START_VAL;
71	}
72
73	/* Essentially blank the list, or give it a inital starting string */
74	strcpy(user_stats.name_list, "");
75
76	#if defined(SOLARIS) \|\| defined(LINUX) \|\| defined(CYGWIN)
77	setutent();
78	while((entry=getutent()) != NULL) {
79	if(entry->ut_type==USER_PROCESS) {
80	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	return NULL;
86	}
87	size_of_namelist=1+(size_of_namelist*2);
88	}
89
90	strncat(user_stats.name_list, entry->ut_user, MAX_LOGIN_NAME_SIZE);
91	strcat(user_stats.name_list, " ");
92	num_users++;
93	}
94	}
95	endutent();
96	#endif
97	#ifdef ALLBSD
98	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
119	#endif
120	/* We want to remove the last " " */
121	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
129	return &user_stats;
130
131	}