X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=para.h;h=4208ae6a9083a0e2e3a956c163808db1b72a761f;hp=3b9559e1beb93062c7cd7cb1cd0daace402b85ae;hb=23b121a85984baa9252f4b4c0b8c4f186e394bb7;hpb=3e6bba778c867a8977704b5c15e52fa18fb0d900

diff --git a/para.h b/para.h
index 3b9559e1..4208ae6a 100644
--- a/para.h
+++ b/para.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 1997-2012 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 1997-2013 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -71,6 +71,11 @@ extern __printf_2_3 void (*para_log)(int, const char*, ...);
 		vfprintf(stderr, fmt, argp); \
 		va_end(argp); \
 	}
+/**
+ * Define the standard log function and activate it.
+ *
+ * \param loglevel_barrier See \ref DEFINE_STDERR_LOGGER.
+ */
 #define INIT_STDERR_LOGGING(loglevel_barrier) \
 	DEFINE_STDERR_LOGGER(stderr_log, loglevel_barrier); \
 	__printf_2_3 void (*para_log)(int, const char*, ...) = stderr_log;
@@ -126,6 +131,18 @@ _static_inline_ long int para_random(unsigned max)
 	return ((max + 0.0) * (random() / (RAND_MAX + 1.0)));
 }
 
+/**
+ * Simple sanity check for I/O vectors.
+ *
+ * \param iov Pointer to the I/O vector to check.
+ *
+ * \return True if \a iov points to a non-empty buffer.
+ */
+_static_inline_ bool iov_valid(const struct iovec *iov)
+{
+	return iov && iov->iov_len > 0 && iov->iov_base;
+}
+
 /** Round up x to next multiple of y. */
 #define ROUND_UP(x, y) ({ \
 	const typeof(y) _divisor = y; \