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-rw-r--r--src/libs6/s6_supervise_link_names.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libs6/s6_supervise_link_names.c b/src/libs6/s6_supervise_link_names.c
index 71fff1d..9af573f 100644
--- a/src/libs6/s6_supervise_link_names.c
+++ b/src/libs6/s6_supervise_link_names.c
@@ -128,6 +128,7 @@ int s6_supervise_link_names (char const *scdir, char const *const *servicedirs,
}
stralloc_free(&rpsa) ;
r = s6_svc_writectl(scdir, S6_SVSCAN_CTLDIR, "a", 1) ;
+ if (!r) errno = ENXIO ;
if (r <= 0) goto errsa ;
killopts = 3 ;
if (ftrigr_wait_and(&a, ids, m, deadline, stamp) < 0) goto errsa ;