* configure: Added check to detect POSIX sleep function.

* eval.c (eval_init): Register new open_tail function as intrinsic.

* match.c (complex_snarf, complex_stream): Update calls to
make_stdio_stream and make_pipe_stream to take fewer arguments.
(match_files): Support a stream object as a data source specification
in place of a string.

* parser.l (parse_reset): Update call to make_stdio_stream to take
fewer arguments.

* stream.c: Inclusion of <unistd.h> made properly conditional.
(struct stdio_handle): pid member defined as pid_t only if we have fork
functionality, otherwise defined as int.
(tail_get_line, tail_get_char, tail_get_byte): New static functions.
(tail_ops): New static structure.
(make_stdio_stream_common): New static structure.
(make_stdio_stream, make_pipe_stream): These functions lose the input
and output parameters, which ended up never used. Reimplemented
in terms of new common function.
(make_tail_stream): New function.
(make_pipevp_stream): Reimplemented in terms of new common function.
(open_file, open_command): Simplified by removal of useless local
variables and their computation, which used to be extra arguments to
make_stdio_stream and make_pipe_stream.
(open_tail): New function.
(stream_init): Calls to make_stdio_stream updated.

* stream.h (make_stdio_stream, make_pipe_stream): Declarations updated.
(make_tail_stream, open_tail): Declared.

* txr.c (txr_main): Calls to make_stdio_stream updated.

1 files changed, 20 insertions, 0 deletions

diff --git a/configure b/configure
index 22b61cdc..b184d6c4 100755
--- a/configure
+++ b/configure
@@ -1278,6 +1278,26 @@ int x = sizeof ((struct tm *) 0)->$try_field;
   fi
 done
 
+printf "Checking for POSIX sleep function ... "
+
+cat > conftest.c <<!
+#include <unistd.h>
+
+int main(int argc, char **argv)
+{
+  sleep(42);
+  return 0;
+}
+!
+rm -f conftest
+if ! $make conftest > conftest.err 2>&1 || ! [ -x conftest ] ; then
+  printf "no\n"
+else
+  printf "yes\n"
+  printf "#define HAVE_POSIX_SLEEP 1\n" >> config.h
+fi
+
+
 printf "done\n"
 
 #