/contrib/ntp/arlib/README
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- Asynchronous DNS
- ----------------
- Intro.
- For those who write real time network applications that have to handle
- multiple TCP or UDP connections, the problem of effectively doing DNS
- lookups is quite real. Generally, this means the program waits while
- the query finishes, holding everything else up. This small library of
- routines aims to solve that problem by performing the DNS query and
- then returning the program to its normal flow.
- Whats included ?
- The library routines, arlib.c, a header file for it, arlib.h, a man
- page, arlib.3 and an example of how this sort of code is used,
- sample.c.
- Compilation & Installation.
- Edit the Makefile and do "make install" to install things where you
- wish them to go. You should check it makes and works before doing
- this :)
- If the compilation is successful, you'll have an executeable called
- "example" and libares.a. "example" is a simple program which will
- do hostname->IP# or IP#->hostnae lookups by entering either the
- hostname or IP# on the line with "Host-->". You dont have to wait
- for a query to fail or succeed before typing in the next line.
- Portability.
- I'm not sure how portable this is, it was written under SunOS 4.1.2
- on a Sparc 1+ and hasn't been tested very widely. If you find any
- problems when compiling/execution, plase send me a patch (using
- diff -c) to avalon@coombs.anu.edu.au. If it goes well enough, I'll
- send it to comp.unix.sources or comp.sources.misc for further testing.
- Future additions.
- Adding a working cache would be nice but I'm not sure if that really
- is needed (?). I guess it depends on how often your program is
- required to do a DNS lookup and whether caching would help.
- Cheers,
- Darren.