onsdag den 29 september 2010 klockan 08:12 skrev Simon Josefsson detta:
> Mats Erik Andersson <mats.anders...@gisladisker.se> writes:
>
> > tisdag den 28 september 2010 klockan 23:50 skrev Simon Josefsson detta:
> >> Mats Erik Andersson <mats.anders...@gisladisker.se> writes:
> >>
> >> > My other suggested patching of the TFTP client presently adds
> >> >
> >> > NI_MAXSERV
> >> > struct addrinfo
> >> > getaddrinfo(3)
> >> > gai_strerror(3)
> >> > freeaddrinfo(3)
> >> > strrchr(3)
> >> >
> >> > All these are fulfilled by any decent OS as far as I understand.
> >>
> >> And if they aren't, gnulib fixes that for us.
> >>
> >> However, why do you need NI_MAXSERV? I can't find it in POSIX nor in
> >> the Glibc manual. I'm not sure it is portable.
> >
> > See getnameinfo(3). The constant ought to be present in <netdb.h>
> > for every decent OS.
>
> Interesting, it is documented in RFC 2133/2553/4038 and from the man
> page it appears to be intended as a GNU-extension, but it is not
> mentioned in POSIX or the Glibc manual. I wonder how portable it is?
> An old Solaris host I looked at had it. Maybe something for the Austin
> group...
>
> NOTES
> In order to assist the programmer in choosing reasonable sizes for the
> supplied buffers, <netdb.h> defines the constants
>
> #define NI_MAXHOST 1025
> #define NI_MAXSERV 32
>
> Since glibc 2.8, these definitions are exposed only if one of the
> fea???
> ture test macros _BSD_SOURCE, _SVID_SOURCE, or _GNU_SOURCE is defined.
>
> The former is the constant MAXDNAME in recent versions of BIND's
> <arpa/nameser.h> header file. The latter is a guess based on the
> ser???
> vices listed in the current Assigned Numbers RFC.
Quoting from OpenBSD, i.e., their libc implementation, and getnameinfo(3):
The maximum value for _hostlen_ is NI_MAXHOST and the maximum value
for _servlen_ is NI_MAXSERV, as defined in <netdb.h>.
Once someone begins commenting on the TFTP __client__ patch, I will also
condition the use of NI_MAXHOST for that code, just to be safe. Anyway,
the use of NI_MAXHOST and NI_MAXSERV is commonly considered as the portable
way for OpenBSD and GNU/Linux as far as I understand things.
Mats E A
