1 files changed, 20 insertions, 0 deletions
diff --git a/src/libstddjb/socket_connected.c b/src/libstddjb/socket_connected.c
new file mode 100644
index 0000000..895eaf3
--- /dev/null
+++ b/src/libstddjb/socket_connected.c
@@ -0,0 +1,20 @@
+/* ISC license. */
+
+#include <skalibs/nonposix.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/socket.h>
+
+int socket_connected (int s)
+{
+  struct sockaddr_in sa ;
+  socklen_t dummy = sizeof sa ;
+  if (getpeername(s, (struct sockaddr *)&sa, &dummy) == -1)
+  {
+    char ch ;
+    fd_read(s, &ch, 1) ; /* sets errno */
+    return 0 ;
+  }
+  return 1 ;
+}