Class: IO

Inherits:
Object
  • Object
show all
Defined in:
(unknown)

Instance Method Summary collapse

Instance Method Details

#readv(iov) ⇒ Object 



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# File 'ext/vio/vio.c', line 31

static VALUE 
vio_read(VALUE io, VALUE iov)
{
    Check_Type(iov, T_ARRAY);
    int fd;
#ifdef RUBY19
    rb_io_t *fptr;
#else
    OpenFile *fptr;
#endif
    if (RARRAY_LEN(iov) == 0) rb_raise(rb_eIOError, "No buffer offsets given");  
    GetOpenFile(io, fptr);
    rb_io_check_readable(fptr);
#ifdef RUBY19
    fd = fptr->fd;
#else
    fd = fileno(fptr->f);
#endif
    /* XXX Todo: Error handling */
    lseek(fd, 0L, SEEK_SET);
    fptr->lineno = 0;
    struct iovec iovs[IOV_MAX];
    int i, size, bytes_read;
    int expected = 0;
    int cnt = RARRAY_LEN(iov);
    VALUE results = rb_ary_new2(cnt);
    for (i=0; i < cnt; i++) {
      size = FIX2INT(RARRAY_PTR(iov)[i]);
      expected = expected + size;
      iovs[i].iov_len = size;
      iovs[i].iov_base = malloc(size);
    }    
    bytes_read = readv(fd,iovs,cnt);
    if (bytes_read < expected) rb_raise(rb_eIOError, "Vectored I/O read failure!");
    for (i=0; i < cnt; i++) {
      rb_ary_push(results, rb_tainted_str_new((char *)iovs[i].iov_base, iovs[i].iov_len));
    }
    return results;
}

#writev(iov) ⇒ Object 



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# File 'ext/vio/vio.c', line 71

static VALUE 
vio_write(VALUE io, VALUE iov)
{
   Check_Type(iov, T_ARRAY);
   int fd;
#ifdef RUBY19
    rb_io_t *fptr;
#else
    OpenFile *fptr;
#endif
    if (RARRAY_LEN(iov) == 0) rb_raise(rb_eIOError, "No buffers to write given");  
    GetOpenFile(io, fptr);
    rb_io_check_writable(fptr);
#ifdef RUBY19
    fd = fptr->fd;
#else
    fd = fileno(fptr->f);
#endif
    /* XXX Todo: Error handling */
    lseek(fd, 0L, SEEK_SET);
    fptr->lineno = 0;
    struct iovec iovs[IOV_MAX];
    int i, size, bytes_written;
    int expected = 0;
    int cnt = RARRAY_LEN(iov);
    VALUE results = rb_ary_new2(cnt);
    for (i=0; i < cnt; i++) {
      VALUE str = RARRAY_PTR(iov)[i];
      size = RSTRING_LEN(str);
      expected = expected + size;
      iovs[i].iov_len = size;
      iovs[i].iov_base = RSTRING_PTR(str);
    }    
    bytes_written = writev(fd,iovs,cnt);
    if (bytes_written < expected) rb_raise(rb_eIOError, "Vectored I/O write failure!");
    for (i=0; i < cnt; i++) {
      rb_ary_push(results, INT2FIX(iovs[i].iov_len));
    }
    return results;
}