log: also set errno to the passed error code before processing format string in log_struct()

That way the caller may use %m to print the specified error.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/shared/log.c b/src/shared/log.c
index 56469b32b..eba5853ab 100644
--- a/src/shared/log.c
+++ b/src/shared/log.c
@@ -813,6 +813,9 @@ int log_struct_internal(
                          * since vasprintf() leaves it afterwards at
                          * an undefined location */
 
+                        if (error != 0)
+                                errno = error;
+
                         va_copy(aq, ap);
                         if (vasprintf(&buf, format, aq) < 0) {
                                 va_end(aq);
@@ -856,6 +859,9 @@ int log_struct_internal(
                 while (format) {
                         va_list aq;
 
+                        if (error != 0)
+                                errno = error;
+
                         va_copy(aq, ap);
                         vsnprintf(buf, sizeof(buf), format, aq);
                         va_end(aq);