Hi,
I am 100% sure that my colleague found fundamentals of this bug.
On SPARC linux is used thread safe version of gethostbyname
genthostbyname_r. This function have third argument char buffer. But if
this buffer is not correctly aligned (on SPARC / 4 ) program crashed
with BUSS ERROR. I attach demonstrate program to test this issue. If you
change size of buffer from 1002 to 1000 program start working.
I mean that simple workaround on SPARC is not use gethostbyname_r.
Regards
Dan
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#include<stdio.h>
#include<netdb.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
extern int h_errno;
int main(void)
{
int ret;
const char *name="karotka";
char buf[1002];
int tmp_errno,buflen;
struct hostent tmp_hostent,*hp;
//struct hostent_data hd;
int size;
buflen=1000;
//size=sizeof(struct hostent_data);
//printf("size=%d\n",size);
printf("Align buff result=%p,buffer=%p,buflen=%d\n",&tmp_hostent,buf,buflen);
ret=gethostbyname_r(name,&tmp_hostent, buf,buflen,&hp,&tmp_errno);
printf("ret:=%d\n",ret);
if(ret==0)
{
if(hp)
{
printf("Lenght:=%d\n",hp->h_length);
printf("Addr:=%X\n",hp->h_addr);
printf("Name:=%s\n",hp->h_name);
}
}
return(ret);
}
