1 files changed, 63 insertions, 0 deletions
diff --git a/src/libstddjb/iopause_select.c b/src/libstddjb/iopause_select.c
new file mode 100644
index 0000000..a9c6529
--- /dev/null
+++ b/src/libstddjb/iopause_select.c
@@ -0,0 +1,63 @@
+/* ISC license. */
+
+#include <sys/types.h>
+#include <string.h>  /* Solaris... */
+#include <errno.h>
+#include <sys/select.h>
+#include <skalibs/tai.h>
+#include <skalibs/iopause.h>
+
+int iopause_select (iopause_fd *x, unsigned int len, tain_t const *deadline, tain_t const *stamp)
+{
+  struct timeval tv = { .tv_sec = 0, .tv_usec = 0 } ;
+  int nfds = 0 ;
+  fd_set rfds, wfds, xfds ;
+  int r ;
+  
+  FD_ZERO(&rfds) ;
+  FD_ZERO(&wfds) ;
+  FD_ZERO(&xfds) ;
+  if (deadline && tain_less(stamp, deadline))
+  {
+    tain_t delta ;
+    tain_sub(&delta, deadline, stamp) ;
+    if (!timeval_from_tain_relative(&tv, &delta))
+    {
+      if (errno != ERANGE) return -1 ;
+      else deadline = 0 ;
+    }
+  }
+
+  {
+    register unsigned int i = 0 ;
+    for (; i < len ; i++)
+    {
+      x[i].revents = 0 ;
+      if (x[i].fd >= 0)
+      {
+        if (x[i].fd >= nfds) nfds = x[i].fd + 1 ;
+        if (x[i].events & IOPAUSE_READ) FD_SET(x[i].fd, &rfds) ;
+        if (x[i].events & IOPAUSE_WRITE) FD_SET(x[i].fd, &wfds) ;
+        if (x[i].events & IOPAUSE_EXCEPT) FD_SET(x[i].fd, &xfds) ;
+      }
+    }
+  }
+
+  r = select(nfds, &rfds, &wfds, &xfds, deadline ? &tv : 0) ;
+
+  if (r > 0)
+  {
+    register unsigned int i = 0 ;
+    for (; i < len ; i++) if (x[i].fd >= 0)
+    {
+      if ((x[i].events & IOPAUSE_READ) && FD_ISSET(x[i].fd, &rfds))
+        x[i].revents |= IOPAUSE_READ ;
+      if ((x[i].events & IOPAUSE_WRITE) && FD_ISSET(x[i].fd, &wfds))
+        x[i].revents |= IOPAUSE_WRITE ;
+      if ((x[i].events & IOPAUSE_EXCEPT) && FD_ISSET(x[i].fd, &xfds))
+        x[i].revents |= IOPAUSE_EXCEPT ;
+    }
+  }
+
+  return r ;
+}