glibc-bug in fgetgrent

[Michael Karcher <mkarcher@kloster.be.schule.de>]

Hello developer(s),

There is a bug in glibc2 (package libc6-dev.2.1.1-6). At our school we
have a *huge* group named pupils (ca. 600 members). A simple test program
using getgrent works perfectly:


#include <stdio.h>
#include <stdlib.h>
#include <grp.h>
#include <sys/types.h>

int main(void)
{
	struct group * g;
	setgrent();
	while(1)
	{
		g = getgrent();
		if(!g)
			break;
		printf("%s: %d\n",g->gr_name,g->gr_gid);
	}
		
}

If you do the same using fgetgrent the huge group is skipped and at the
end of file fgetgrent is eating all available memory. Not so good :-(
Here is the second test program:


#include <stdio.h>
#include <stdlib.h>
#include <grp.h>
#include <sys/types.h>

int main(void)
{
	struct group * g;
	FILE * f;
	f = fopen("/etc/group","r");
	while(1)
	{
		g = fgetgrent(f);
		if(!g)
			break;
		printf("%s: %d\n",g->gr_name,g->gr_gid);
	}
		
}

I hope for help ... Michael Karcher