Add wiredtiger_strerror_r, a thread-safe version of wiredtiger_strerror,

which allows us to support Windows' errors where we have to allocate a
buffer to get the error string.

1 files changed, 27 insertions, 0 deletions

diff --git a/src/os_posix/os_errno.c b/src/os_posix/os_errno.c
index 9290f7d651f..b0cb288ea74 100644
--- a/src/os_posix/os_errno.c
+++ b/src/os_posix/os_errno.c
@@ -20,3 +20,30 @@ __wt_errno(void)
 	 */
 	return (errno == 0 ? WT_ERROR : errno);
 }
+
+/*
+ * __wt_strerror_r --
+ *	POSIX implementation of strerror_r.
+ */
+int
+__wt_strerror_r(int error, char *buf, size_t buflen)
+{
+	char *p;
+
+	/* Require at least 2 bytes, printable character and trailing nul. */
+	if (buflen < 2)
+		return (ENOMEM);
+
+	/*
+	 * POSIX errors are non-negative integers, copy the string into the
+	 * user's buffer. Return success if anything printed (we checked if
+	 * the buffer had space for at least one character).
+	 */
+	if (error > 0 &&
+	    (p = strerror(error)) != NULL && snprintf(buf, buflen, "%s", p) > 0)
+		return (0);
+
+	/* Fallback to a generic message, then guess it's a memory problem. */
+	return (
+	    snprintf(buf, buflen, "error return: %d", error) > 0 ? 0 : ENOMEM);
+}