Re: gethostby... broken when forked

[Andrew Lipnitsky <ert at cit dot org dot by>]

Hi Jeff!!!
Your program work fine for me [WinNT4.0 SP3 + gnuwin b18]
but it does nothing because the parent
process exit before child can do something.
The following source determines host properly (at leas for me).

#include <stdio.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>

int main(argc, argv)
int argc;
char *argv[];
{
  struct hostent *hostptr; /* Internet host struct from netdb.h */
  char hostname[256];
  int childpid;

  strcpy(hostname, argv[1]);
  printf("PARENT STARTED PID=%d\n", getpid());

  if ((childpid = fork()) < 0) {
    printf("fork failed\n");
    exit(0);

  } else if (childpid == 0) {           /* start child process */
    printf("CHILD STARTED PID=%d\n", getpid());
    hostptr = gethostbyname(hostname);  /* BOMBS HERE */
    printf("hostptr = %p\n hostname=%s\n", hostptr,hostptr->h_name);
    exit(0);

  } else sleep(100);   //  !!! parent process wait for child
}

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