added readme and license, fixed posix compiler warning

.gitignore

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+*.o
+wstationd

LICENSE

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+Copyright (c) 2012, Christopher Ramey, unless otherwise noted.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.

README.md

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+wstationd
+=========
+`wstationd` is a simple daemon (written in C) for accepting Iridium Short Data
+Bursts via Direct IP. While it's intended to be used for collecting data from
+remote weather stations (thus the name), it can be used to collect information
+from any source operating over the Iridium SDB Service. `wstationd` has been
+tested on OSX, FreeBSD and Linux.
+
+
+Building
+--------
+Running `make` should be sufficient in most cases to compile `wstationd`.
+
+
+Running
+-------
+`wstationd` requires a single argument to specify the directory SDB will be
+collected into. Files will be created using a simple naming convention
+indicating the time it was collected and the IP it was collected from. Parsing
+these files is an exercise left up to the reader - the format will differ
+greatly based on your hardware. `wstationd` leaves all of the SDB headers
+intact, so you'll need to account for that when parsing. Good luck!

src/wstationd.c

@@ -1,3 +1,5 @@
+#define _POSIX_C_SOURCE 1
+
 #include <stdio.h>
 #include <unistd.h>
 #include <time.h>