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286 lines
6.2 KiB
C
286 lines
6.2 KiB
C
/* -*- c-file-style: "ruby"; indent-tabs-mode: t -*- */
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/**********************************************************************
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io/wait.c -
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$Author$
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created at: Tue Aug 28 09:08:06 JST 2001
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All the files in this distribution are covered under the Ruby's
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license (see the file COPYING).
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**********************************************************************/
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#include "ruby.h"
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#include "ruby/io.h"
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#include <sys/types.h>
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#if defined(HAVE_UNISTD_H) && (defined(__sun))
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#include <unistd.h>
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#endif
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#if defined(HAVE_SYS_IOCTL_H)
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#include <sys/ioctl.h>
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#endif
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#if defined(FIONREAD_HEADER)
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#include FIONREAD_HEADER
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#endif
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#ifdef HAVE_RB_W32_IOCTLSOCKET
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#define ioctl ioctlsocket
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#define ioctl_arg u_long
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#define ioctl_arg2num(i) ULONG2NUM(i)
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#else
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#define ioctl_arg int
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#define ioctl_arg2num(i) INT2NUM(i)
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#endif
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#ifdef HAVE_RB_W32_IS_SOCKET
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#define FIONREAD_POSSIBLE_P(fd) rb_w32_is_socket(fd)
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#else
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#define FIONREAD_POSSIBLE_P(fd) ((void)(fd),Qtrue)
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#endif
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/*
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* call-seq:
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* io.nread -> int
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*
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* Returns number of bytes that can be read without blocking.
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* Returns zero if no information available.
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*/
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static VALUE
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io_nread(VALUE io)
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{
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rb_io_t *fptr = NULL;
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ioctl_arg n;
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GetOpenFile(io, fptr);
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rb_io_check_readable(fptr);
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int len = rb_io_read_pending(fptr);
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if (len > 0) return INT2FIX(len);
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if (!FIONREAD_POSSIBLE_P(fptr->fd)) return INT2FIX(0);
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if (ioctl(fptr->fd, FIONREAD, &n)) return INT2FIX(0);
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if (n > 0) return ioctl_arg2num(n);
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return INT2FIX(0);
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}
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static VALUE
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io_wait_event(VALUE io, int event, VALUE timeout)
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{
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VALUE result = rb_io_wait(io, RB_INT2NUM(event), timeout);
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if (!RB_TEST(result)) {
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return Qnil;
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}
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int mask = RB_NUM2INT(result);
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if (mask & event) {
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return io;
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}
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else {
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return Qfalse;
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}
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}
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/*
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* call-seq:
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* io.ready? -> true or false
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*
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* Returns +true+ if input available without blocking, or +false+.
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*/
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static VALUE
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io_ready_p(VALUE io)
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{
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rb_io_t *fptr;
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GetOpenFile(io, fptr);
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rb_io_check_readable(fptr);
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if (rb_io_read_pending(fptr)) return Qtrue;
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return io_wait_event(io, RUBY_IO_READABLE, RB_INT2NUM(0));
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}
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/*
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* call-seq:
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* io.wait_readable -> true or false
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* io.wait_readable(timeout) -> true or false
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*
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* Waits until IO is readable and returns +true+, or
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* +false+ when times out.
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* Returns +true+ immediately when buffered data is available.
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*/
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static VALUE
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io_wait_readable(int argc, VALUE *argv, VALUE io)
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{
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rb_io_t *fptr = NULL;
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RB_IO_POINTER(io, fptr);
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rb_io_check_readable(fptr);
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if (rb_io_read_pending(fptr)) return Qtrue;
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rb_check_arity(argc, 0, 1);
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VALUE timeout = (argc == 1 ? argv[0] : Qnil);
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return io_wait_event(io, RUBY_IO_READABLE, timeout);
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}
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/*
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* call-seq:
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* io.wait_writable -> true or false
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* io.wait_writable(timeout) -> true or false
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*
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* Waits until IO is writable and returns +true+ or
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* +false+ when times out.
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*/
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static VALUE
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io_wait_writable(int argc, VALUE *argv, VALUE io)
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{
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rb_io_t *fptr = NULL;
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RB_IO_POINTER(io, fptr);
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rb_io_check_writable(fptr);
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rb_check_arity(argc, 0, 1);
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VALUE timeout = (argc == 1 ? argv[0] : Qnil);
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return io_wait_event(io, RUBY_IO_WRITABLE, timeout);
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}
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/*
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* call-seq:
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* io.wait_priority -> true or false
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* io.wait_priority(timeout) -> true or false
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*
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* Waits until IO is priority and returns +true+ or
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* +false+ when times out.
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*/
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static VALUE
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io_wait_priority(int argc, VALUE *argv, VALUE io)
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{
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rb_io_t *fptr = NULL;
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RB_IO_POINTER(io, fptr);
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rb_io_check_readable(fptr);
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if (rb_io_read_pending(fptr)) return Qtrue;
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rb_check_arity(argc, 0, 1);
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VALUE timeout = argc == 1 ? argv[0] : Qnil;
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return io_wait_event(io, RUBY_IO_PRIORITY, timeout);
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}
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static int
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wait_mode_sym(VALUE mode)
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{
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if (mode == ID2SYM(rb_intern("r"))) {
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return RB_WAITFD_IN;
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}
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if (mode == ID2SYM(rb_intern("read"))) {
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return RB_WAITFD_IN;
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}
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if (mode == ID2SYM(rb_intern("readable"))) {
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return RB_WAITFD_IN;
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}
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if (mode == ID2SYM(rb_intern("w"))) {
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return RB_WAITFD_OUT;
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}
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if (mode == ID2SYM(rb_intern("write"))) {
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return RB_WAITFD_OUT;
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}
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if (mode == ID2SYM(rb_intern("writable"))) {
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return RB_WAITFD_OUT;
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}
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if (mode == ID2SYM(rb_intern("rw"))) {
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return RB_WAITFD_IN|RB_WAITFD_OUT;
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}
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if (mode == ID2SYM(rb_intern("read_write"))) {
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return RB_WAITFD_IN|RB_WAITFD_OUT;
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}
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if (mode == ID2SYM(rb_intern("readable_writable"))) {
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return RB_WAITFD_IN|RB_WAITFD_OUT;
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}
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rb_raise(rb_eArgError, "unsupported mode: %"PRIsVALUE, mode);
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return 0;
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}
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/*
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* call-seq:
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* io.wait(events, timeout) -> event mask or false.
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* io.wait(timeout = nil, mode = :read) -> event mask or false (deprecated)
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*
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* Waits until the IO becomes ready for the specified events and returns the
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* subset of events that become ready, or +false+ when times out.
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*
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* The events can be a bit mask of +IO::READABLE+, +IO::WRITABLE+ or
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* +IO::PRIORITY+.
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*
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* Returns +true+ immediately when buffered data is available.
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*
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* Optional parameter +mode+ is one of +:read+, +:write+, or
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* +:read_write+ (deprecated).
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*/
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static VALUE
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io_wait(int argc, VALUE *argv, VALUE io)
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{
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VALUE timeout = Qnil;
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rb_io_event_t events = 0;
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if (argc < 2 || (argc >= 2 && RB_SYMBOL_P(argv[1]))) {
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if (argc > 0) {
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timeout = argv[0];
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}
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for (int i = 1; i < argc; i += 1) {
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events |= wait_mode_sym(argv[i]);
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}
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}
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else if (argc == 2) {
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events = RB_NUM2UINT(argv[0]);
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if (argv[1] != Qnil) {
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timeout = argv[1];
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}
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}
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else {
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// TODO error
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return Qnil;
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}
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if (events == 0) {
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events = RUBY_IO_READABLE;
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}
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if (events & RUBY_IO_READABLE) {
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rb_io_t *fptr = NULL;
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RB_IO_POINTER(io, fptr);
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if (rb_io_read_pending(fptr)) {
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return Qtrue;
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}
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}
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return io_wait_event(io, events, timeout);
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}
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/*
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* IO wait methods
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*/
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void
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Init_wait(void)
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{
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rb_define_method(rb_cIO, "nread", io_nread, 0);
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rb_define_method(rb_cIO, "ready?", io_ready_p, 0);
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rb_define_method(rb_cIO, "wait", io_wait, -1);
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rb_define_method(rb_cIO, "wait_readable", io_wait_readable, -1);
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rb_define_method(rb_cIO, "wait_writable", io_wait_writable, -1);
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rb_define_method(rb_cIO, "wait_priority", io_wait_priority, -1);
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}
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