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netdb.h: re-enable EAI_ADDRFAMILY, EAI_NODATA

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EAI_ADDRFAMILY and EAI_NODATA are not in RFC 3493, but are available
and used in many other systems.  It is desirable to have at least one
of them in order to distinguish between names that do not resolve and
those that do not have the requested address type.  A change to
getaddrinfo() will use EAI_ADDRFAMILY.  Both were "#if 0"; re-enable,
conditioned on __BSD_VISIBLE, and update comments.  Also add comments
and __BSD_VISIBLE conditional for the last three EAI errors, which
are not in the RFC or POSIX.  Note, all of these are available in
NetBSD and OpenBSD, and EAI_ADDRFAMILY and EAI_NODATA are available
in Linux (glibc).

Reviewed in https://reviews.freebsd.org/D37139 with related changes.

Reviewed by:	bz
MFC after:	1 month
This commit is contained in:
Mike Karels 2022-11-02 10:43:04 -05:00
parent 1b898b834b
commit 40e4e12bd8
1 changed files with 7 additions and 4 deletions
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11
include/netdb.h
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@ -161,8 +161,8 @@ struct addrinfo {
/*
* Error return codes from gai_strerror(3), see RFC 3493.
*/
#if 0
/* Obsoleted on RFC 3493 */
#if __BSD_VISIBLE /* not in POSIX */
/* EAI_ADDRFAMILY was obsoleted by RFC 3493, used as extension */
#define EAI_ADDRFAMILY 1 /* address family for hostname not supported */
#endif
#define EAI_AGAIN 2 /* name could not be resolved at this time */
@ -170,17 +170,20 @@ struct addrinfo {
#define EAI_FAIL 4 /* non-recoverable failure in name resolution */
#define EAI_FAMILY 5 /* address family not recognized */
#define EAI_MEMORY 6 /* memory allocation failure */
#if 0
/* Obsoleted on RFC 3493 */
#if __BSD_VISIBLE /* not in POSIX */
/* EAI_NODATA was obsoleted by RFC 3493, retained here as extension */
#define EAI_NODATA 7 /* no address associated with hostname */
#endif
#define EAI_NONAME 8 /* name does not resolve */
#define EAI_SERVICE 9 /* service not recognized for socket type */
#define EAI_SOCKTYPE 10 /* intended socket type was not recognized */
#define EAI_SYSTEM 11 /* system error returned in errno */
#if __BSD_VISIBLE /* not in POSIX */
/* The following 3 are not in RFC 3493 or POSIX, retained for compatibility */
#define EAI_BADHINTS 12 /* invalid value for hints */
#define EAI_PROTOCOL 13 /* resolved protocol is unknown */
#define EAI_OVERFLOW 14 /* argument buffer overflow */
#endif
#define EAI_MAX 15
/*