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, 17 insertions, 0 deletions

diff --git a/src/errors.h b/src/errors.h
new file mode 100644
index 000000000..e323fc511
--- /dev/null
+++ b/src/errors.h
@@ -0,0 +1,17 @@
+#ifndef INCLUDE_errors_h__
+#define INCLUDE_errors_h__
+#include "git/errors.h"
+
+/* convenience functions */
+static inline int git_int_error(int code)
+{
+	git_errno = code;
+	return code;
+}
+
+static inline void *git_ptr_error(int code)
+{
+	git_errno = code;
+	return NULL;
+}
+#endif