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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2009-09-06 07:07:01 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2009-09-28 12:46:18 +0200 |
| commit | f9d5775ff84e4cdff0d7e79b4c52ead11a7169f1 (patch) | |
| tree | b054e7a185335774751beabb58dc6dc5908848e2 /man3/getaddrinfo.3 | |
| parent | 2b64c171eb95c0c0dcf2ac5399c38cf7fb32636a (diff) | |
getaddrinfo.3: Note nonstandard assumed hints.ai_flags value when hints is NULL
When hints is NULL, glibc assumes hints.ai_flags is
AI_V4MAPPED|AI_ADDRCONFIG whereas POSIX says 0.
According to Ulrich Drepper, glibc's behavior is better.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man3/getaddrinfo.3')
| -rw-r--r-- | man3/getaddrinfo.3 | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/man3/getaddrinfo.3 b/man3/getaddrinfo.3 index 09170067..cb151ef2 100644 --- a/man3/getaddrinfo.3 +++ b/man3/getaddrinfo.3 @@ -38,7 +38,7 @@ .\" FIXME . glibc's 2.9 NEWS file documents DCCP and UDP-lite support .\" and is SCTP support now also there? .\" -.TH GETADDRINFO 3 2008-12-04 "GNU" "Linux Programmer's Manual" +.TH GETADDRINFO 3 2009-09-03 "GNU" "Linux Programmer's Manual" .SH NAME getaddrinfo, freeaddrinfo, gai_strerror \- network address and service translation @@ -593,6 +593,16 @@ and are available since glibc 2.3.3. .B AI_NUMERICSERV is available since glibc 2.3.4. + +According to POSIX.1-2001, specifying +.I hints +as NULL should cause +.I ai_flags +to be assumed as 0. +The GNU C library instead assumes a value of +.BR "(AI_V4MAPPED\ |\ AI_ADDRCONFIG)" +for this case, +since this value is considered an improvement on the specification. .SH EXAMPLE .\" getnameinfo.3 refers to this example .\" socket.2 refers to this example |