1 /**************************************************************************/
2 /*                                                                        */
3 /*       Copyright (c) Microsoft Corporation. All rights reserved.        */
4 /*                                                                        */
5 /*       This software is licensed under the Microsoft Software License   */
6 /*       Terms for Microsoft Azure RTOS. Full text of the license can be  */
7 /*       found in the LICENSE file at https://aka.ms/AzureRTOS_EULA       */
8 /*       and in the root directory of this software.                      */
9 /*                                                                        */
10 /**************************************************************************/
11 
12 
13 /**************************************************************************/
14 /**************************************************************************/
15 /**                                                                       */
16 /** NetX Component                                                        */
17 /**                                                                       */
18 /**   Transmission Control Protocol (TCP)                                 */
19 /**                                                                       */
20 /**************************************************************************/
21 /**************************************************************************/
22 
23 #define NX_SOURCE_CODE
24 
25 
26 /* Include necessary system files.  */
27 
28 #include "nx_api.h"
29 #include "nx_tcp.h"
30 
31 
32 /* Bring in externs for caller checking code.  */
33 
34 NX_CALLER_CHECKING_EXTERNS
35 
36 
37 /**************************************************************************/
38 /*                                                                        */
39 /*  FUNCTION                                               RELEASE        */
40 /*                                                                        */
41 /*    _nxe_tcp_socket_bytes_available                     PORTABLE C      */
42 /*                                                           6.1          */
43 /*  AUTHOR                                                                */
44 /*                                                                        */
45 /*    Yuxin Zhou, Microsoft Corporation                                   */
46 /*                                                                        */
47 /*  DESCRIPTION                                                           */
48 /*                                                                        */
49 /*    This function checks for errors in the TCP socket bytes             */
50 /*    available function call.                                            */
51 /*                                                                        */
52 /*  INPUT                                                                 */
53 /*                                                                        */
54 /*    socket_ptr                            Pointer to socket             */
55 /*    bytes_available                       Pointer to bytes available    */
56 /*                                                                        */
57 /*  OUTPUT                                                                */
58 /*                                                                        */
59 /*    status                                Completion status             */
60 /*                                                                        */
61 /*  CALLS                                                                 */
62 /*                                                                        */
63 /*    _nx_tcp_socket_bytes_available        Actual TCP socket bytes       */
64 /*                                            available function          */
65 /*                                                                        */
66 /*  CALLED BY                                                             */
67 /*                                                                        */
68 /*    Application                                                         */
69 /*                                                                        */
70 /*  RELEASE HISTORY                                                       */
71 /*                                                                        */
72 /*    DATE              NAME                      DESCRIPTION             */
73 /*                                                                        */
74 /*  05-19-2020     Yuxin Zhou               Initial Version 6.0           */
75 /*  09-30-2020     Yuxin Zhou               Modified comment(s),          */
76 /*                                            resulting in version 6.1    */
77 /*                                                                        */
78 /**************************************************************************/
_nxe_tcp_socket_bytes_available(NX_TCP_SOCKET * socket_ptr,ULONG * bytes_available)79 UINT  _nxe_tcp_socket_bytes_available(NX_TCP_SOCKET *socket_ptr, ULONG *bytes_available)
80 {
81 
82 UINT status;
83 
84 
85     /* Check for invalid input pointers.  */
86     if ((socket_ptr == NX_NULL) ||
87         (socket_ptr -> nx_tcp_socket_id != NX_TCP_ID) ||
88         (bytes_available == NX_NULL))
89     {
90         return(NX_PTR_ERROR);
91     }
92 
93     /* Check to see if TCP is enabled.  */
94     if (!(socket_ptr -> nx_tcp_socket_ip_ptr) -> nx_ip_tcp_packet_receive)
95     {
96         return(NX_NOT_ENABLED);
97     }
98 
99     /* Check for appropriate caller.  */
100     NX_THREADS_ONLY_CALLER_CHECKING
101 
102     /* Call actual TCP socket receive function.  */
103     status =  _nx_tcp_socket_bytes_available(socket_ptr, bytes_available);
104 
105     /* Return completion status.  */
106     return(status);
107 }
108 
109