On Mon, Aug 30, 1999 at 06:30:29PM +1000, Brian May wrote: > wtmp: I don't understand why it should be so large for 294 entries: > snoopy# last | wc > 294 2788 22522 > > Thats 26kb per entry!!! Really??? If this really is the case, please > tell me why each record is so large...
More information.
last is displaying *ALL* entries that I would expect it to display.
However, it adds two extra lines to the bottom, so the space per entry
would actually higher then what I stated...
[530] [snoopy:bam] /tmp/wtmp >for i in *; do ls -l $i; last -f $i | wc; done
-rw-r--r-- 1 bam users 235776 Sep 1 10:46 wtmp
4 25 192
-rw-r--r-- 1 bam users 1396992 Sep 1 06:52 wtmp.0
5 37 271
-rw-r--r-- 1 bam users 8510592 Aug 31 07:44 wtmp.1
302 2861 23140
-rw-r--r-- 1 bam users 3072 Jul 31 20:09 wtmp.2
4 25 194
-rw-r--r-- 1 bam users 508800 Jul 31 07:28 wtmp.3
312 2949 23910
-rw-r--r-- 1 bam users 5081472 Jun 30 23:21 wtmp.4
527 5003 40465
-rw-r--r-- 1 bam users 10752 May 31 21:22 wtmp.5
10 81 656
Summary of above:
-----------------------------------
|num| bytes |entries| bytes/entry
+---+---------+-------+------------
| 1 | 235776 | 2 | 117,888
| 2 | 1396992 | 3 | 465,664
| 3 | 8510592 | 300 | 28,368
| 4 | 3072 | 2 | 1,536
| 5 | 508800 | 310 | 1,641
| 6 | 5081472 | 525 | 9,678
| 7 | 10752 | 8 | 1,344
-----------------------------------
Needless to say, I am rather alarmed at the first few entries. Almost
1.5 Mb just for 3 entries (yes, I have confirmed this)!!!
What on earth on going on here?
Is there something fundemental about wtmp files I do not understand.
I was under the impression (and the man page for wtmp seems to confirm
this) that wtmp is just a number of utmp records.
So what size *should* the record be? According to the man
page for wtmp, the utmp C structure is used. My C program,
attached, says:
[519] [snoopy:bam] ~ >gcc -g -Wall mytest.c -o mytest
[520] [snoopy:bam] ~ >./mytest
sizeof(struct utmp)=384
--
Brian May <[EMAIL PROTECTED]>
/* compile with: gcc -g -Wall mytest.c -o mytest */
#include <stdio.h>
#include <utmp.h>
int main()
{
printf("sizeof(struct utmp)=%d\n",sizeof(struct utmp));
return(0);
}
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