Adds support for presenter level caching modules and implements a file based one (requires xattr support)

1 files changed, 23 insertions, 0 deletions

diff --git a/project2/common/exceptions.cpp b/project2/common/exceptions.cpp
index 2fa5509..4f061ab 100644
--- a/project2/common/exceptions.cpp
+++ b/project2/common/exceptions.cpp
@@ -48,3 +48,26 @@ two_part_error::what() const throw()
 	return buf;
 }
 
+
+syscall_error::syscall_error(int e) :
+	err(e),
+	buf(NULL)
+{
+}
+
+syscall_error::~syscall_error() throw()
+{
+	free(buf);
+}
+
+const char *
+syscall_error::what() const throw()
+{
+	if (!buf) {
+		if (asprintf(&buf, "%s (%d)", strerror(err), err) < 1) {
+			throw std::bad_alloc();
+		}
+	}
+	return buf;
+}
+