Loop termination question. I hope this is the right forum

for((fp =
fopen("/var/log/wtmp","r"))!=0;fread(&log_file,sizeof(struct
utmp),1,fp) !=0;) {
(snip)
fclose(fp);

Okay, then one last question.

How come when I change the path from

"/var/log/wtmp" to something like "/home/cdalten/non-existant-file.txt"
I get Segmentation fault? I thought the error would be stored in 'fp'.
Because you always do a read, even if the open fails. Just take a good
look at the first part of your for statement.

(SPOILER: your compare doesn't do anything......)

Kind regards,
Johan

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Okay, then one last question.

How come when I change the path from

"/var/log/wtmp" to something like "/home/cdalten/non-existant-file.txt"
I get Segmentation fault? I thought the error would be stored in 'fp'.

#include <stdio.h>
#include <utmp.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>

static int user_info(struct utmp *user){

setutent();

grocery_stocker wrote:

for((fp =
fopen("/var/log/wtmp","r"))!=0;fread(&log_file,sizeof(struct
utmp),1,fp) !=0;) {

(snip)

fclose(fp);

You close `fp`, then you try and `fread` from it.

Oops. All bets are off.