site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com Graham, If you change to use sizeof(struct utmp) then this works as expected. -Jason #import <Foundation/Foundation.h> #import <utmp.h> #import <stdlib.h> #import <stdio.h> extern int errno; int main (int argc, const char * argv[]) { NSAutoreleasePool *pool=[[NSAutoreleasePool alloc] init]; FILE *utmp_file; struct utmp *utmp_store; _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl... On Dec 13, 2005, at 7:38 AM, Graham J Lee wrote: I want to get login information for users (basically my goal is a Bonjour-enabled equivalent to the old GNU or ICSI distributed finger server[*], where any systems on the local network register themselves with the server so I can find out if a user has logged in anywhere on the local network) and as neither of the distributed fingers come anywhere near close to compiling on Darwin (8.3.0) have tried to start from scratch. Having observed that /var/run/ utmpx is empty, and that there's no getutent on Darwin, I'm doing it the same way that programs like w(1) do and reading struct utmps from the appropriate file. However, what I get back doesn't seem consistent with the idea that utmp(5) [or indeed wtmp(5)] is just a bunch of struct utmps stored back to back. Here's my code: It looks like your problem is that you're using sizeof on a pointer, which is going to be 4, rather than the correct size, so you're looking at the file four bytes at a time. errno=0; if((utmp_file=fopen(_PATH_UTMP,"rb"))==NULL) { perror("csalutd: couldn't open utmp"); exit(EXIT_FAILURE); } if((utmp_store=(struct utmp *)malloc(sizeof(utmp_store)))==NULL) { perror("csalutd: couldn't malloc struct"); exit(EXIT_FAILURE); } while(fread(utmp_store,sizeof(utmp_store),1,utmp_file)==1) { printf("That fool %s, over %s way, was responsible.\nIt was at % d on %s.\n",utmp_store->ut_name,utmp_store->ut_host,utmp_store-

ut_time,utmp_store->ut_line);

} fclose(utmp_file); [pool release]; return 0; } This email sent to site_archiver@lists.apple.com