method

syswrite

v1_9_2_180 - Show latest stable - 0 notes - Class: IO

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syswrite(p1) public

Writes the given string to ios using a low-level write. Returns the number of bytes written. Do not mix with other methods that write to ios or you may get unpredictable results. Raises SystemCallError on error.

f = File.new("out", "w")
f.syswrite("ABCDEF")   #=> 6

Show source

static VALUE
rb_io_syswrite(VALUE io, VALUE str)
{
    rb_io_t *fptr;
    long n;

    rb_secure(4);
    if (TYPE(str) != T_STRING)
        str = rb_obj_as_string(str);

    io = GetWriteIO(io);
    GetOpenFile(io, fptr);
    rb_io_check_writable(fptr);

    if (fptr->wbuf_len) {
        rb_warn("syswrite for buffered IO");
    }
    if (!rb_thread_fd_writable(fptr->fd)) {
        rb_io_check_closed(fptr);
    }

    n = write(fptr->fd, RSTRING_PTR(str), RSTRING_LEN(str));

    if (n == -1) rb_sys_fail_path(fptr->pathv);

    return LONG2FIX(n);
}

syswrite

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