Adding poll function.

* configure: Check for the poll function and set
HAVE_POLL accordingly in config.h.

* stream.h (fd_k): External declaration added.

* sysif.c (poll_wrap): New function.
(sysif_init): Registered poll-in, poll-out, poll-err,
poll-pri, poll-rdhup, poll-nval, poll-rdband, poll-wrband
variables and poll function.

* txr.1: Documented poll.

1 files changed, 26 insertions, 0 deletions

diff --git a/configure b/configure
index 6763f807..aeb7c820 100755
--- a/configure
+++ b/configure
@@ -1477,6 +1477,32 @@ else
 fi
 
 #
+# poll
+#
+
+printf "Checking for poll ... "
+
+cat > conftest.c <<!
+#include <poll.h>
+#include "config.h"
+
+int main(int argc, char **argv)
+{
+  struct pollfd fds[42] = { 0 };
+  nfds_t n = 42;
+  int err = poll(&fds, 42, 1000);
+  return 0;
+}
+!
+
+if conftest ; then
+  printf "yes\n"
+  printf "#define HAVE_POLL 1\n" >> $config_h
+else
+  printf "no\n"
+fi
+
+#
 # Check for fields inside struct tm
 #