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64afa78e8a
[Fixes GH-418] https://github.com/ruby/ruby/pull/418 based on the original discussion from documenting-ruby/ruby#18 git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43314 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
135 lines
2.8 KiB
C
135 lines
2.8 KiB
C
/**********************************************************************
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io/wait.c -
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$Author$
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created at: Tue Jul 14 21:53:18 2009
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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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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#ifdef F_GETFL
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static int
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io_nonblock_mode(int fd)
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{
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int f = fcntl(fd, F_GETFL);
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if (f == -1) rb_sys_fail(0);
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return f;
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}
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#else
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#define io_nonblock_mode(fd) ((void)(fd), 0)
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#endif
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#ifdef F_GETFL
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/*
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* call-seq:
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* io.nonblock? -> boolean
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*
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* Returns +true+ if an IO object is in non-blocking mode.
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*/
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static VALUE
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rb_io_nonblock_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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if (io_nonblock_mode(fptr->fd) & O_NONBLOCK)
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return Qtrue;
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return Qfalse;
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}
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#else
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#define rb_io_nonblock_p rb_f_notimplement
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#endif
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#ifdef F_SETFL
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static void
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io_nonblock_set(int fd, int f, int nb)
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{
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if (nb) {
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if ((f & O_NONBLOCK) != 0)
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return;
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f |= O_NONBLOCK;
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}
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else {
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if ((f & O_NONBLOCK) == 0)
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return;
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f &= ~O_NONBLOCK;
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}
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if (fcntl(fd, F_SETFL, f) == -1)
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rb_sys_fail(0);
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}
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/*
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* call-seq:
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* io.nonblock = boolean -> boolean
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*
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* Enables non-blocking mode on a stream when set to
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* +true+, and blocking mode when set to +false+.
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*/
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static VALUE
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rb_io_nonblock_set(VALUE io, VALUE nb)
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{
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rb_io_t *fptr;
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GetOpenFile(io, fptr);
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io_nonblock_set(fptr->fd, io_nonblock_mode(fptr->fd), RTEST(nb));
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return io;
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}
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static VALUE
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io_nonblock_restore(VALUE arg)
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{
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int *restore = (int *)arg;
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if (fcntl(restore[0], F_SETFL, restore[1]) == -1)
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rb_sys_fail(0);
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return Qnil;
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}
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/*
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* call-seq:
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* io.nonblock {|io| } -> io
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* io.nonblock(boolean) {|io| } -> io
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*
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* Yields +self+ in non-blocking mode.
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*
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* When +false+ is given as an argument, +self+ is yielded in blocking mode.
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* The original mode is restored after the block is executed.
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*/
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static VALUE
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rb_io_nonblock_block(int argc, VALUE *argv, VALUE io)
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{
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int nb = 1;
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rb_io_t *fptr;
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int f, restore[2];
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GetOpenFile(io, fptr);
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if (argc > 0) {
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VALUE v;
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rb_scan_args(argc, argv, "01", &v);
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nb = RTEST(v);
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}
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f = io_nonblock_mode(fptr->fd);
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restore[0] = fptr->fd;
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restore[1] = f;
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io_nonblock_set(fptr->fd, f, nb);
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return rb_ensure(rb_yield, io, io_nonblock_restore, (VALUE)restore);
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}
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#else
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#define rb_io_nonblock_set rb_f_notimplement
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#define rb_io_nonblock_block rb_f_notimplement
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#endif
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void
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Init_nonblock(void)
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{
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rb_define_method(rb_cIO, "nonblock?", rb_io_nonblock_p, 0);
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rb_define_method(rb_cIO, "nonblock=", rb_io_nonblock_set, 1);
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rb_define_method(rb_cIO, "nonblock", rb_io_nonblock_block, -1);
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}
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