[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v2 2/2] doc: Introduce coding style for errors
From: |
Lluís Vilanova |
Subject: |
[Qemu-devel] [PATCH v2 2/2] doc: Introduce coding style for errors |
Date: |
Mon, 23 Nov 2015 19:41:24 +0100 |
User-agent: |
StGit/0.17.1-dirty |
Gives some general guidelines for reporting errors in QEMU.
Signed-off-by: Lluís Vilanova <address@hidden>
---
HACKING | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/HACKING b/HACKING
index 12fbc8a..e59bc34 100644
--- a/HACKING
+++ b/HACKING
@@ -157,3 +157,34 @@ painful. These are:
* you may assume that integers are 2s complement representation
* you may assume that right shift of a signed integer duplicates
the sign bit (ie it is an arithmetic shift, not a logical shift)
+
+7. Error reporting
+
+QEMU provides two different mechanisms for reporting errors. You should use one
+of these mechanisms instead of manually reporting them (i.e., do not use
+'printf', 'exit' or 'abort').
+
+7.1. Errors in user inputs
+
+QEMU provides the functions in "include/qemu/error-report.h" to report errors
+related to inputs provided by the user (e.g., command line arguments or
+configuration files).
+
+These functions generate error messages with a uniform format that can
reference
+a location on the offending input.
+
+7.2. Other errors
+
+QEMU provides the functions in "include/qapi/error.h" to report other types of
+errors (i.e., not triggered by command line arguments or configuration files).
+
+Functions in this header are used to accumulate error messages in an 'Error'
+object, which can be propagated up the call chain where it is finally reported.
+
+In its simplest form, you can immediately report an error with:
+
+ error_setg(&error_warn, "Error with %s", "arguments");
+
+See the "include/qapi/error.h" header for additional convenience functions and
+special arguments. Specially, see 'error_fatal' and 'error_abort' to show
errors
+and immediately terminate QEMU.