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/**********************************************************************
io/nonblock.c -
$Author$
created at: Tue Jul 14 21:53:18 2009
All the files in this distribution are covered under the Ruby's
license (see the file COPYING).
**********************************************************************/
#include "ruby.h"
#include "ruby/io.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#ifdef F_GETFL
static int
io_nonblock_mode(int fd)
{
int f = fcntl(fd, F_GETFL);
if (f == -1) rb_sys_fail(0);
return f;
}
#else
#define io_nonblock_mode(fd) ((void)(fd), 0)
#endif
#ifdef F_GETFL
/*
* call-seq:
* io.nonblock? -> boolean
*
* Returns +true+ if an IO object is in non-blocking mode.
*/
static VALUE
rb_io_nonblock_p(VALUE io)
{
rb_io_t *fptr;
GetOpenFile(io, fptr);
if (io_nonblock_mode(fptr->fd) & O_NONBLOCK)
return Qtrue;
return Qfalse;
}
#else
#define rb_io_nonblock_p rb_f_notimplement
#endif
#ifdef F_SETFL
static int
io_nonblock_set(int fd, int f, int nb)
{
if (nb) {
if ((f & O_NONBLOCK) != 0)
return 0;
f |= O_NONBLOCK;
}
else {
if ((f & O_NONBLOCK) == 0)
return 0;
f &= ~O_NONBLOCK;
}
if (fcntl(fd, F_SETFL, f) == -1)
rb_sys_fail(0);
return 1;
}
/*
* call-seq:
* io.nonblock = boolean -> boolean
*
* Enables non-blocking mode on a stream when set to
* +true+, and blocking mode when set to +false+.
*/
static VALUE
rb_io_nonblock_set(VALUE io, VALUE nb)
{
rb_io_t *fptr;
GetOpenFile(io, fptr);
if (RTEST(nb))
rb_io_set_nonblock(fptr);
else
io_nonblock_set(fptr->fd, io_nonblock_mode(fptr->fd), RTEST(nb));
return io;
}
static VALUE
io_nonblock_restore(VALUE arg)
{
int *restore = (int *)arg;
if (fcntl(restore[0], F_SETFL, restore[1]) == -1)
rb_sys_fail(0);
return Qnil;
}
/*
* call-seq:
* io.nonblock {|io| } -> io
* io.nonblock(boolean) {|io| } -> io
*
* Yields +self+ in non-blocking mode.
*
* When +false+ is given as an argument, +self+ is yielded in blocking mode.
* The original mode is restored after the block is executed.
*/
static VALUE
rb_io_nonblock_block(int argc, VALUE *argv, VALUE io)
{
int nb = 1;
rb_io_t *fptr;
int f, restore[2];
GetOpenFile(io, fptr);
if (argc > 0) {
VALUE v;
rb_scan_args(argc, argv, "01", &v);
nb = RTEST(v);
}
f = io_nonblock_mode(fptr->fd);
restore[0] = fptr->fd;
restore[1] = f;
if (!io_nonblock_set(fptr->fd, f, nb))
return rb_yield(io);
return rb_ensure(rb_yield, io, io_nonblock_restore, (VALUE)restore);
}
#else
#define rb_io_nonblock_set rb_f_notimplement
#define rb_io_nonblock_block rb_f_notimplement
#endif
void
Init_nonblock(void)
{
rb_define_method(rb_cIO, "nonblock?", rb_io_nonblock_p, 0);
rb_define_method(rb_cIO, "nonblock=", rb_io_nonblock_set, 1);
rb_define_method(rb_cIO, "nonblock", rb_io_nonblock_block, -1);
}
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