[Bug nscd/34483] New: getaddrinfo with hint AF_INET does not cache

https://sourceware.org/bugzilla/show_bug.cgi?id=34483

            Bug ID: 34483
           Summary: getaddrinfo with hint AF_INET does not cache
           Product: glibc
           Version: 2.45
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: nscd
          Assignee: unassigned at sourceware dot org
          Reporter: josef at oderland dot se
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Given the code

```
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char *argv[])
{
    int              sfd, s;
    struct addrinfo  hints;
    struct addrinfo  *result, *rp;

    memset(&hints, 0, sizeof(hints));
    hints.ai_family = AF_INET;    /* Allow IPv4 or IPv6 */
    hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
    hints.ai_flags = 0;
    hints.ai_protocol = 0;          /* Any protocol */

    s = getaddrinfo("example.com", "80", &hints, &result);
    if (s != 0) {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
        exit(EXIT_FAILURE);
    }

    exit(EXIT_SUCCESS);
}
```

nscd returns

```
root@6cfc07995929:/data# ./test-inet
Wed Aug  5 08:54:07 2026 - 77899: handle_request: request received (Version =
2) from PID 78071
Wed Aug  5 08:54:07 2026 - 77899:       GETFDHST
Wed Aug  5 08:54:07 2026 - 77899: handle_request: request received (Version =
2) from PID 78071
Wed Aug  5 08:54:07 2026 - 77899:       GETHOSTBYNAME (example.com)
Wed Aug  5 08:54:07 2026 - 77899: Haven't found "example.com" in hosts cache!
root@6cfc07995929:/data# ./test-inet
Wed Aug  5 08:54:08 2026 - 77899: handle_request: request received (Version =
2) from PID 78072
Wed Aug  5 08:54:08 2026 - 77899:       GETFDHST
Wed Aug  5 08:54:08 2026 - 77899: handle_request: request received (Version =
2) from PID 78072
Wed Aug  5 08:54:08 2026 - 77899:       GETHOSTBYNAME (example.com)
Wed Aug  5 08:54:08 2026 - 77899: Haven't found "example.com" in hosts cache!
```

Using AF_UNSPEC as hint works, since it will do a GETAI (example.com) instead.

This turned out to be a problem since cURL have started to do two lookups
instead of one in their getaddrinfo, one with AF_INET and one with AF_INET6.

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