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authorStefan Hajnoczi <stefanha@linux.vnet.ibm.com>2010-10-05 14:28:50 +0100
committerBlue Swirl <blauwirbel@gmail.com>2010-10-09 08:16:45 +0000
commit9a85d3944715c709d740edb987b84bd657b9d7ef (patch)
tree16ae216eeb23b6294efc2a36268d37c2cf8286fa /docs/tracing.txt
parent3e18c6bf7740e4a75503b803ec7d5dc29a531e4f (diff)
trace: Use portable format strings
It is not portable to use "%ld" for int64_t because int64_t may have type long on 64-bit platforms and long long on 32-bit platforms. Use the standard library PRId64 macros to keep format strings portable. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
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diff --git a/docs/tracing.txt b/docs/tracing.txt
index ae01ff1378..5504850857 100644
--- a/docs/tracing.txt
+++ b/docs/tracing.txt
@@ -72,6 +72,10 @@ Trace events should use types as follows:
* For everything else, use primitive scalar types (char, int, long) with the
appropriate signedness.
+Format strings should reflect the types defined in the trace event. Take
+special care to use PRId64 and PRIu64 for int64_t and uint64_t types,
+respectively. This ensures portability between 32- and 64-bit platforms.
+
=== Hints for adding new trace events ===
1. Trace state changes in the code. Interesting points in the code usually