Add s6_supervise_link and s6_supervise_unlink for future s6-rc change

1 files changed, 45 insertions, 0 deletions

diff --git a/src/libs6/s6_supervise_unlink.c b/src/libs6/s6_supervise_unlink.c
new file mode 100644
index 0000000..d4bbe73
--- /dev/null
+++ b/src/libs6/s6_supervise_unlink.c
@@ -0,0 +1,45 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <limits.h>
+
+#include <skalibs/posixplz.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/djbunix.h>
+
+#include <s6/s6-supervise.h>
+
+#ifdef PATH_MAX
+# define S6_PATH_MAX PATH_MAX
+#else
+# define S6_PATH_MAX 4096
+#endif
+
+void s6_supervise_unlink (char const *scandir, char const *name, uint32_t options)
+{
+  int e = errno ;
+  int fd = -1 ;
+  size_t scandirlen = strlen(scandir) ;
+  size_t namelen = strlen(name) ;
+  char fn[scandirlen + namelen + sizeof(S6_SUPERVISE_CTLDIR) + 10] ;
+  memcpy(fn, scandir, scandirlen) ;
+  fn[scandirlen] = '/' ;
+  memcpy(fn + scandirlen + 1, name, namelen) ;
+  if (options & 1)
+  {
+    fn[scandirlen + 1 + namelen] = '/' ;
+    memcpy(fn + scandirlen + 1 + namelen + 1, S6_SUPERVISE_CTLDIR, sizeof(S6_SUPERVISE_CTLDIR) - 1) ;
+    memcpy(fn + scandirlen + 1 + namelen + sizeof(S6_SUPERVISE_CTLDIR), "/control", 9) ;
+    fd = open_write(fn) ;
+  }
+  fn[scandirlen + 1 + namelen] = 0 ;
+  unlink_void(fn) ;
+  if (fd >= 0)
+  {
+    fd_write(fd, "xd", 1 + !!(options & 2)) ;
+    fd_close(fd) ;
+  }
+  errno = e ;
+}