Commit 32c03ead authored by Daniel Stenberg's avatar Daniel Stenberg
Browse files

glibc 2.2.93 gethostbyname_r() no longer returns ERANGE if the given buffer 

size isn't big enough. For some reason they now return EAGAIN.

Redhat 8 ships with this glibc version.
parent 0fa512f2

lib/hostip.c

+19 −8
Original line number Diff line number Diff line
@@ -597,14 +597,25 @@ Curl_addrinfo *Curl_getaddrinfo(struct SessionHandle *data, 
#endif

#ifdef HAVE_GETHOSTBYNAME_R_6

    /* Linux */

    while((res=gethostbyname_r(hostname,

    do {

      res=gethostbyname_r(hostname,

			  (struct hostent *)buf,

			  (char *)buf + sizeof(struct hostent),

			  step_size - sizeof(struct hostent),

			  &h, /* DIFFERENCE */

                               &h_errnop))==ERANGE) {

			  &h_errnop);

      /* Redhat 8, using glibc 2.2.93 changed the behavior. Now all of a

         sudden this function seems to be setting EAGAIN if the given buffer

         size is too small. Previous versions are known to return ERANGE for

         the same. */



      if((ERANGE == res) || (EAGAIN == res)) {

	step_size+=200;

	continue;

      }

      break;

    } while(1);



    if(!h) /* failure */

      res=1;