close_read()
public
Closes the read end of a duplex I/O stream
(i.e., one that contains both a read and a write stream, such as a pipe). Will raise an IOError if the stream is not duplexed.
f = IO.popen("/bin/sh","r+")
f.close_read
f.readlines
produces:
prog.rb:3:in `readlines': not opened for reading (IOError)
from prog.rb:3
Show source
/*
* call-seq:
* ios.close_read => nil
*
* Closes the read end of a duplex I/O stream (i.e., one that contains
* both a read and a write stream, such as a pipe). Will raise an
* <code>IOError</code> if the stream is not duplexed.
*
* f = IO.popen("/bin/sh","r+")
* f.close_read
* f.readlines
*
* <em>produces:</em>
*
* prog.rb:3:in `readlines': not opened for reading (IOError)
* from prog.rb:3
*/
static VALUE
rb_io_close_read(io)
VALUE io;
{
rb_io_t *fptr;
int n;
if (rb_safe_level() >= 4 && !OBJ_TAINTED(io)) {
rb_raise(rb_eSecurityError, "Insecure: can't close");
}
GetOpenFile(io, fptr);
if (fptr->f2 == 0 && (fptr->mode & FMODE_WRITABLE)) {
rb_raise(rb_eIOError, "closing non-duplex IO for reading");
}
if (fptr->f2 == 0) {
return rb_io_close(io);
}
n = fclose(fptr->f);
fptr->mode &= ~FMODE_READABLE;
fptr->f = fptr->f2;
fptr->f2 = 0;
if (n != 0) rb_sys_fail(fptr->path);
return Qnil;
}