NetNews Usenet Archive 1992 #31/NN_1992_31.iso/spool/comp/sys/sgi/misc/67

Text File | 1992-12-22 | 2.2 KB | 72 lines

Newsgroups: comp.sys.sgi.misc
Path: sparky!uunet!spool.mu.edu!sgiblab!sgigate!sgi!xingping.esd.sgi.com!arc
From: [e-mail] (Andrew Cherenson)
Subject: Re: Gethostbyname Error
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: Silicon Graphics, Inc.  Mountain View, CA
Date: Tue, 22 Dec 1992 00:22:31 GMT
Lines: 61

The following code doesn't coredump for me on 4.0.5:
    Made it past gethostbyname
    Made it past gethostbyname
It's important to make sure hp isn't NULL before using it.

In article <[e-mail]> [e-mail] (Mark Stephan Coyle) writes:
>I have  made a simple example of the code I am using, it still exhibits the
>same  problem:
>
>#include <sys/types.h>
>#include <sys/socket.h>
>#include <netinet/in.h>
>#include <netdb.h>
>#include <stdio.h>
>#include <time.h>
>#define TRUE 1
>#define M_SOCKET 0x00000001
>int data[1024];
>struct hosttable {
>char hname[40];
>int worm;
>};
>clock_t start,end;
>
>
>
>int main(int argc, char **argv)
>{
>        int sock ;
>        int i ;
>        struct sockaddr_in server;
>        struct hostent *hp, *gethostbyname();
>        char buf[1024];
>        char host[40];
>        char mtype;
>        char mcontent[40];
>        struct hosttable htable[5];
>                sock=socket(AF_INET,SOCK_DGRAM,0);
>                if(sock<0) {
>                        perror("opening stream socket");
>                        exit(0);
>                        };
>                server.sin_port = htons(atoi(argv[1]));
>
>                server.sin_family=AF_INET;
>                start=end=clock();
>                while(TRUE){
>                start=end=clock();
>                printf("Made it past gethostbyname \n");
>                hp=gethostbyname("dexter.psych.umn.edu");
>                printf("Made it past gethostbyname \n");
>                exit(1);
>                bcopy(hp->h_addr, &(server.sin_addr.s_addr),hp->h_length);
>                if(connect(sock,&server,sizeof(server))<0){
>                        perror("connecting datagram socket");
>                }
>                        if(write(sock,data,sizeof(data))<0)
>                        perror("writing on stream socket");
>                end=clock();
>         }