[Bug network/26830] New: gai_strerror(EAI_OVERFLOW) reports nothing useful

["jengelh at inai dot de" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26830

            Bug ID: 26830
           Summary: gai_strerror(EAI_OVERFLOW) reports nothing useful
           Product: glibc
           Version: 2.32
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: network
          Assignee: unassigned at sourceware dot org
          Reporter: jengelh at inai dot de
  Target Milestone: ---

Testcase:

#include <netdb.h>
#include <stdio.h>
#include <arpa/inet.h>
int main()
{
        struct sockaddr_in6 sa;
        inet_pton(AF_INET6, "2001:db8::1", &sa.sin6_addr);
        sa.sin6_family = AF_INET6;
        char host[2]; /* deliberately small */
        int ret = getnameinfo((struct sockaddr *)&sa, sizeof(sa), host,
                  sizeof(host), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV);
        if (ret != 0)
                printf("%s\n", gai_strerror(ret));
}

Observed:

"Unknown error"

Expected to see:

"Buffer too small" or something

Reason:

There is no error string defined for EAI_OVERFLOW (and possibly other codes).

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