Class: IO

Relationships & Source Files
Inherits:	Object
Defined in:	ext/etc/etc.c

Instance Method Summary

#pathconf(arg)

Returns pathname configuration variable using fpathconf().

Instance Method Details

#pathconf(arg)

Returns pathname configuration variable using fpathconf().

name should be a constant under ::Etc which begins with PC_.

The return value is an integer or nil. nil means indefinite limit. (fpathconf() returns -1 but errno is not set.)

require 'etc'
IO.pipe {|r, w|
  p w.pathconf(Etc::PC_PIPE_BUF) #=> 4096
}

[ GitHub ]

# File 'ext/etc/etc.c', line 939


static VALUE
io_pathconf(VALUE io, VALUE arg)
{
    int name;
    long ret;
    rb_io_t *fptr;

    name = NUM2INT(arg);

    GetOpenFile(io, fptr);

    errno = 0;
    ret = fpathconf(fptr->fd, name);
    if (ret == -1) {
        if (errno == 0) /* no limit */
            return Qnil;
        rb_sys_fail("fpathconf");
    }
    return LONG2NUM(ret);
}