1 files changed, 25 insertions, 0 deletions
diff --git a/lib/isfdtype.c b/lib/isfdtype.c
new file mode 100644
index 0000000..8e51516
--- /dev/null
+++ b/lib/isfdtype.c
@@ -0,0 +1,25 @@
+#include "../include/sane/config.h"
+
+#ifndef HAVE_ISFDTYPE
+
+#include <sys/stat.h>
+
+int
+isfdtype(int fd, int fdtype)
+{
+  struct stat st;
+  
+  if (fstat(fd, &st) == -1) return 0; /* couldn't stat fd */
+
+  if (st.st_mode == 0)
+    return 1; /* At least Irix doesn't seem to know socket type */
+#if defined(S_ISSOCK)
+  return S_ISSOCK(st.st_mode) != 0;
+#elif defined(S_IFSOCK) && defined(S_IFMT)
+  return (st.st_mode & S_IFMT) == S_IFSOCK;
+#else
+  return 0;
+#endif
+}
+
+#endif /* !HAVE_ISFDTYPE */