Add an embryo of a TLS-aware error handling system

This adds the per-thread global variable git_errno to the
system, which callers can examine to get information about
an error.

Two helper functions are added to reduce LoC-count for the
library code itself.

Also, some exceptions are made for running sparse on GIT_TLS
definitions, since it doesn't grok thread-local variables at
all.

Signed-off-by: Andreas Ericsson <ae@op5.se>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/src/git/errors.h b/src/git/errors.h
new file mode 100644
index 000000000..d0a0d6308
--- /dev/null
+++ b/src/git/errors.h
@@ -0,0 +1,25 @@
+#ifndef INCLUDE_git_errors_h__
+#define INCLUDE_git_errors_h__
+/**
+ * @file git/errors.h
+ * @brief Git error handling routines and variables
+ * @ingroup Git
+ * @{
+ */
+
+#include "common.h"
+#include "thread-utils.h"
+GIT_BEGIN_DECL
+
+/** The git errno. */
+GIT_EXTERN(int) GIT_TLS git_errno;
+
+/**
+ * strerror() for the Git library
+ * @param num The error code to explain
+ * @return a string explaining the error code
+ */
+GIT_EXTERN(const char *) git_strerror(int num);
+/** @} */
+GIT_END_DECL
+#endif