[newlib-cygwin] gai_strerror() - Update string error messages according to RFC 3493.

[Sebastian Huber <sh@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=84ba60e6ebc9a2ea3898278b2a6a9669cd5b58b5

commit 84ba60e6ebc9a2ea3898278b2a6a9669cd5b58b5
Author: pfg <pfg@FreeBSD.org>
Date:   Sun Dec 23 18:15:48 2018 +0000

    gai_strerror() - Update string error messages according to RFC 3493.
    
    Error messages in gai_strerror(3) vary largely among OSs.
    
    For new software we largely replaced the obsoleted EAI_NONAME and
    with EAI_NODATA but we never updated the corresponding message to better
    match the intended use. We also have references to ai_flags and ai_family
    which are not very descriptive for non-developer end users.
    
    Bring new new error messages based on informational RFC 3493, which has
    obsoleted RFC 2553, and make them consistent among the header adn
    manpage.
    
    MFC after:	1 month
    Differentical Revision:	D18630

Diff:
---
 newlib/libc/sys/rtems/include/netdb.h | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/newlib/libc/sys/rtems/include/netdb.h b/newlib/libc/sys/rtems/include/netdb.h
index 3a42485..cf0330a 100644
--- a/newlib/libc/sys/rtems/include/netdb.h
+++ b/newlib/libc/sys/rtems/include/netdb.h
@@ -159,24 +159,24 @@ struct addrinfo {
 #define	NO_ADDRESS	NO_DATA		/* no address, look for MX record */
 
 /*
- * Error return codes from getaddrinfo()
+ * Error return codes from gai_strerror(3), see RFC 3493.
  */
 #if 0
-/* obsoleted */
+/* Obsoleted on RFC 2553bis-02 */
 #define	EAI_ADDRFAMILY	 1	/* address family for hostname not supported */
 #endif
-#define	EAI_AGAIN	 2	/* temporary failure in name resolution */
-#define	EAI_BADFLAGS	 3	/* invalid value for ai_flags */
+#define	EAI_AGAIN	 2	/* name could not be resolved at this time */
+#define	EAI_BADFLAGS	 3	/* flags parameter had an invalid value */
 #define	EAI_FAIL	 4	/* non-recoverable failure in name resolution */
-#define	EAI_FAMILY	 5	/* ai_family not supported */
+#define	EAI_FAMILY	 5	/* address family was recognized */
 #define	EAI_MEMORY	 6	/* memory allocation failure */
 #if 0
-/* obsoleted */
+/* Obsoleted on RFC 2553bis-02 */
 #define	EAI_NODATA	 7	/* no address associated with hostname */
 #endif
-#define	EAI_NONAME	 8	/* hostname nor servname provided, or not known */
-#define	EAI_SERVICE	 9	/* servname not supported for ai_socktype */
-#define	EAI_SOCKTYPE	10	/* ai_socktype not supported */
+#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 */
 #define	EAI_BADHINTS	12	/* invalid value for hints */
 #define	EAI_PROTOCOL	13	/* resolved protocol is unknown */