+/* We sometimes print in the tracing path, and tracing can occur in
+ * signal handlers, so we must use a print method which is signal safe.
+ */
+
+#define sigsafe_print_err(fmt, args...) \
+{ \
+ /* Can't use dynamic allocation. Limit ourselves to 250 chars. */ \
+ char ____buf[250]; \
+ int ____saved_errno; \
+\
+ /* Save the errno. */ \
+ ____saved_errno = errno; \
+\
+ snprintf(____buf, sizeof(____buf), fmt, ## args); \
+\
+ /* Add end of string in case of buffer overflow. */ \
+ ____buf[sizeof(____buf)-1] = 0; \
+\
+ patient_write(STDERR_FILENO, ____buf, strlen(____buf)); \
+ /* Can't print errors because we are in the error printing code path. */ \
+\
+ /* Restore errno, in order to be async-signal safe. */ \
+ errno = ____saved_errno; \
+}
+