1 /***************************************************************************
2 * Copyright (c) 2024 Microsoft Corporation
3 *
4 * This program and the accompanying materials are made available under the
5 * terms of the MIT License which is available at
6 * https://opensource.org/licenses/MIT.
7 *
8 * SPDX-License-Identifier: MIT
9 **************************************************************************/
10
11
12 /**************************************************************************/
13 /**************************************************************************/
14 /** */
15 /** POSIX wrapper for THREADX */
16 /** */
17 /** */
18 /** */
19 /**************************************************************************/
20 /**************************************************************************/
21
22 /* Include necessary system files. */
23
24 #include "tx_api.h" /* Threadx API */
25 #include "pthread.h" /* Posix API */
26 #include "px_int.h" /* Posix helper functions */
27
28
29 /**************************************************************************/
30 /* */
31 /* FUNCTION RELEASE */
32 /* */
33 /* sem_unlink PORTABLE C */
34 /* 6.2.0 */
35 /* AUTHOR */
36 /* */
37 /* William E. Lamie, Microsoft Corporation */
38 /* */
39 /* DESCRIPTION */
40 /* */
41 /* This routine removes the string from the semaphore name table ,and */
42 /* marks the corresponding semaphore for destruction. */
43 /* */
44 /* INPUT */
45 /* */
46 /* name Semaphore name. */
47 /* */
48 /* OUTPUT */
49 /* */
50 /* OK If successful */
51 /* ERROR IF fails */
52 /* */
53 /* CALLS */
54 /* */
55 /* posix_find_sem checks the name of semaphore with the names */
56 /* of the already created semaphore. */
57 /* posix_sem_reset Resets the semaphore structure */
58 /* */
59 /* CALLED BY */
60 /* */
61 /* Application Code */
62 /* */
63 /* RELEASE HISTORY */
64 /* */
65 /* DATE NAME DESCRIPTION */
66 /* */
67 /* 06-02-2021 William E. Lamie Initial Version 6.1.7 */
68 /* 10-31-2022 Scott Larson Remove double parenthesis, */
69 /* resulting in version 6.2.0 */
70 /* */
71 /**************************************************************************/
sem_unlink(const CHAR * name)72 INT sem_unlink(const CHAR * name)
73 {
74
75
76 struct POSIX_SEMAPHORE_STRUCT * sem;
77 ULONG len;
78
79
80 /* Checking for the invalid length. */
81 len = strlen(name);
82
83 if(len > SEM_NAME_MAX)
84 {
85 /* Return appropriate error. */
86 posix_errno=ENAMETOOLONG;
87 posix_set_pthread_errno(ENAMETOOLONG);
88 /* Return error. */
89 return(ERROR);
90 }
91
92 if(!(sem=posix_find_sem(name)))
93 {
94 /* Set error in global variable. */
95 posix_errno = ENOENT;
96 posix_set_pthread_errno(ENOENT);
97
98 /* Return Error. */
99 return(ERROR);
100 }
101 if(sem)
102
103 sem->unlink_flag =TX_TRUE;
104
105 /* Check for the count. */
106 if(sem->count == 0)
107 {
108 posix_sem_reset(sem );
109 sem = NULL;
110 }
111
112 return(OK);
113 }
114
