1 files changed, 11 insertions, 12 deletions
diff --git a/src/libs6/s6_svc_ok.c b/src/libs6/s6_svc_ok.c
index 5e6aa27..4940071 100644
--- a/src/libs6/s6_svc_ok.c
+++ b/src/libs6/s6_svc_ok.c
@@ -2,24 +2,23 @@
 
 #include <string.h>
 #include <errno.h>
+
 #include <skalibs/djbunix.h>
+
 #include <s6/s6-supervise.h>
 
 int s6_svc_ok (char const *dir)
 {
-  size_t dirlen = strlen(dir) ;
+  int r ;
+  int e = errno ;
   int fd ;
-  char fn[dirlen + 9 + sizeof(S6_SUPERVISE_CTLDIR)] ;
+  size_t dirlen = strlen(dir) ;
+  char fn[dirlen + 6 + sizeof(S6_SUPERVISE_CTLDIR)] ;
   memcpy(fn, dir, dirlen) ;
-  fn[dirlen] = '/' ;
-  memcpy(fn + dirlen + 1, S6_SUPERVISE_CTLDIR, sizeof(S6_SUPERVISE_CTLDIR) - 1) ;
-  memcpy(fn + dirlen + sizeof(S6_SUPERVISE_CTLDIR), "/control", 9) ;
-  fd = open_write(fn) ;
-  if (fd < 0)
-  {
-    if ((errno == ENXIO) || (errno == ENOENT)) return 0 ;
-    else return -1 ;
-  }
+  memcpy(fn + dirlen, "/" S6_SUPERVISE_CTLDIR "/lock", 6 + sizeof(S6_SUPERVISE_CTLDIR)) ;
+  fd = open_read(fn) ;
+  if (fd < 0) return errno == ENOENT ? (errno = e, 0) : -1 ;
+  r = fd_islocked(fd) ;
   fd_close(fd) ;
-  return 1 ;
+  return r ;
 }