1 files changed, 78 insertions, 0 deletions
diff --git a/src/libstddjb/iobufferk_init.c b/src/libstddjb/iobufferk_init.c
new file mode 100644
index 0000000..03f7fae
--- /dev/null
+++ b/src/libstddjb/iobufferk_init.c
@@ -0,0 +1,78 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+
+#ifdef SKALIBS_HASSPLICE
+
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/iobuffer.h>
+
+static int iobufferk_init_0 (iobufferk_ref k)
+{
+  register int fd = open_write("/dev/null") ;
+  if (fd < 0) return 0 ;
+  if (coe(fd) < 0)
+  {
+    fd_close(fd) ;
+    return 0 ;
+  }
+  k->p[0] = -1 ;
+  k->p[1] = fd ;
+  return 1 ;
+}
+
+static int iobufferk_nofd (iobufferk_ref k)
+{
+  k->p[0] = k->p[1] = -1 ;
+  return 1 ;
+}
+
+static int iobufferk_init_3 (iobufferk_ref k)
+{
+  return (pipenbcoe(k->p) >= 0) ;
+}
+
+static iobufferk_io_func_t_ref iobufferk_init_f[4] =
+{
+  &iobufferk_init_0, &iobufferk_nofd, &iobufferk_nofd, &iobufferk_init_3
+} ;
+
+int iobufferk_init (iobufferk_ref k, int fdin, int fdout)
+{
+  iobufferk tmp ;
+  struct stat st ;
+  register int r ;
+  if (fstat(fdin, &st) < 0) return 0 ;
+  r = fcntl(fdin, F_GETFL) ;
+  if (r < 0) return 0 ;
+  tmp.type = !S_ISFIFO(st.st_mode) ;
+  tmp.nb = !!(r & O_NONBLOCK) ;
+  if (fstat(fdout, &st) < 0) return 0 ;
+  r = fcntl(fdout, F_GETFL) ;
+  if (r < 0) return 0 ;
+  tmp.type |= (!S_ISFIFO(st.st_mode) << 1) ;
+  tmp.nb |= (r & O_NONBLOCK) ? 2 : 0 ;
+  tmp.fd[0] = fdin ;
+  tmp.fd[1] = fdout ;
+  tmp.n = 0 ;
+  if (!(*iobufferk_init_f[tmp.type])(&tmp)) return 0 ;
+  *k = tmp ;
+  return 1 ;
+}
+
+#else
+
+#include <errno.h>
+#include <skalibs/iobuffer.h>
+
+int iobufferk_init (iobufferk_ref k, int fdin, int fdout)
+{
+  (void)k ;
+  (void)fdin ;
+  (void)fdout ;
+  return (errno = ENOSYS, 0) ;
+}
+
+#endif