method

reopen

v1_9_3_392 - Show latest stable - 0 notes - Class: IO

reopen(p1, p2 = v2) public

Reassociates ios with the I/O stream given in other_IO or to a new stream opened on path. This may dynamically change the actual class of this stream.

f1 = File.new("testfile")
f2 = File.new("testfile")
f2.readlines[0]   #=> "This is line one\n"
f2.reopen(f1)     #=> #<File:testfile>
f2.readlines[0]   #=> "This is line one\n"

Show source

static VALUE
rb_io_reopen(int argc, VALUE *argv, VALUE file)
{
    VALUE fname, nmode;
    int oflags;
    rb_io_t *fptr;

    rb_secure(4);
    if (rb_scan_args(argc, argv, "11", &fname, &nmode) == 1) {
        VALUE tmp = rb_io_check_io(fname);
        if (!NIL_P(tmp)) {
            return io_reopen(file, tmp);
        }
    }

    FilePathValue(fname);
    rb_io_taint_check(file);
    fptr = RFILE(file)->fptr;
    if (!fptr) {
        fptr = RFILE(file)->fptr = ALLOC(rb_io_t);
        MEMZERO(fptr, rb_io_t, 1);
    }

    if (!NIL_P(nmode)) {
        int fmode = rb_io_modestr_fmode(StringValueCStr(nmode));
        if (IS_PREP_STDIO(fptr) &&
            ((fptr->mode & FMODE_READWRITE) & (fmode & FMODE_READWRITE)) !=
            (fptr->mode & FMODE_READWRITE)) {
            rb_raise(rb_eArgError,
                     "%s can't change access mode from \"%s\" to \"%s\"",
                     PREP_STDIO_NAME(fptr), rb_io_fmode_modestr(fptr->mode),
                     rb_io_fmode_modestr(fmode));
        }
        fptr->mode = fmode;
        rb_io_mode_enc(fptr, StringValueCStr(nmode));
        fptr->encs.ecflags = 0;
        fptr->encs.ecopts = Qnil;
    }

    fptr->pathv = rb_str_new_frozen(fname);
    oflags = rb_io_fmode_oflags(fptr->mode);
    if (fptr->fd < 0) {
        fptr->fd = rb_sysopen(fptr->pathv, oflags, 0666);
        fptr->stdio_file = 0;
        return file;
    }

    if (fptr->mode & FMODE_WRITABLE) {
        if (io_fflush(fptr) < 0)
            rb_sys_fail(0);
    }
    fptr->rbuf.off = fptr->rbuf.len = 0;

    if (fptr->stdio_file) {
        if (freopen(RSTRING_PTR(fptr->pathv), rb_io_oflags_modestr(oflags), fptr->stdio_file) == 0) {
            rb_sys_fail_path(fptr->pathv);
        }
        fptr->fd = fileno(fptr->stdio_file);
#ifdef USE_SETVBUF
        if (setvbuf(fptr->stdio_file, NULL, _IOFBF, 0) != 0)
            rb_warn("setvbuf() can't be honoured for %s", RSTRING_PTR(fptr->pathv));
#endif
    }
    else {
        if (close(fptr->fd) < 0)
            rb_sys_fail_path(fptr->pathv);
        fptr->fd = -1;
        fptr->fd = rb_sysopen(fptr->pathv, oflags, 0666);
    }

    return file;
}

reopen

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