diff options
Diffstat (limited to 'nuttx/net/net_checksd.c')
-rw-r--r-- | nuttx/net/net_checksd.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/nuttx/net/net_checksd.c b/nuttx/net/net_checksd.c new file mode 100644 index 000000000..3da3cea62 --- /dev/null +++ b/nuttx/net/net_checksd.c @@ -0,0 +1,88 @@ +/**************************************************************************** + * net/net_checksd.c + * + * Copyright (C) 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <sys/socket.h> + +#include <sched.h> +#include <errno.h> +#include <debug.h> + +#include "net_internal.h" + +/**************************************************************************** + * Global Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: net_checksd + * + * Description: + * Check if the socket descriptor is valid for the provided TCB and if it + * supports the requested access. This trivial operation is part of the + * fdopen() operation when the fdopen() is performed on a socket descriptor. + * It simply performs some sanity checking before permitting the socket + * descriptor to be wrapped as a C FILE stream. + * + ****************************************************************************/ + +#if defined(CONFIG_NET) && CONFIG_NFILE_DESCRIPTORS > 0 +int net_checksd(int sd, int oflags) +{ + FAR struct socket *psock = sockfd_socket(sd); + + /* Verify that the sockfd corresponds to valid, allocated socket */ + + if (!psock || psock->s_crefs <= 0) + { + nvdbg("No valid socket for sd: %d\n", sd); + return -EBADF; + } + + /* NOTE: We permit the socket FD to be "wrapped" in a stream as + * soon as the socket descriptor is created by socket(). Therefore + * (1) we don't care if the socket is connected yet, and (2) there + * are no access restrictions that can be enforced yet. + */ + + return OK; +} +#endif /* CONIG_NET && CONFIG_NFILE_DESCRIPTORS > 0 */ + |