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 /** POSIX wrapper for THREADX */
17 /** */
18 /** */
19 /** */
20 /**************************************************************************/
21 /**************************************************************************/
22
23 /* Include necessary system files. */
24
25 #include "tx_api.h" /* Threadx API */
26 #include "pthread.h" /* Posix API */
27 #include "px_int.h" /* Posix helper functions */
28 #include "tx_thread.h" /* Internal ThreadX thread management. */
29
30 /**************************************************************************/
31 /* */
32 /* FUNCTION RELEASE */
33 /* */
34 /* signal PORTABLE C */
35 /* 6.1.7 */
36 /* AUTHOR */
37 /* */
38 /* William E. Lamie, Microsoft Corporation */
39 /* */
40 /* DESCRIPTION */
41 /* */
42 /* This function assigns a function ("signal handler") pointed to by */
43 /* func to be invoked when signal signo occurs. */
44 /* */
45 /* INPUT */
46 /* */
47 /* set Pointer to set of signals */
48 /* */
49 /* OUTPUT */
50 /* */
51 /* OK If successful */
52 /* ERROR If error occurs */
53 /* */
54 /* CALLS */
55 /* */
56 /* posix_in_thread_context */
57 /* posix_internal_error */
58 /* posix_set_pthread_errno */
59 /* tx_thread_identify */
60 /* */
61 /* CALLED BY */
62 /* */
63 /* Application Code */
64 /* */
65 /* RELEASE HISTORY */
66 /* */
67 /* DATE NAME DESCRIPTION */
68 /* */
69 /* 06-02-2021 William E. Lamie Initial Version 6.1.7 */
70 /* */
71 /**************************************************************************/
signal(int signo,void (* func)(int))72 int signal(int signo, void (*func)(int))
73 {
74
75 POSIX_TCB *current_thread;
76
77
78 /* Make sure we're calling this routine from a thread context. */
79 if (!posix_in_thread_context())
80 {
81 /* return POSIX error. */
82 posix_internal_error(444);
83 return(444);
84 }
85
86 /* Determine if the desired signal is valid. */
87 if ((signo < 0) || (signo > SIGRTMAX))
88 {
89
90 /* Return an error. */
91 posix_set_pthread_errno(EINVAL);
92 return(ERROR);
93 }
94
95 /* Now pickup the current thread pointer. */
96 current_thread = (POSIX_TCB *) tx_thread_identify();
97
98 /* Now index into the array of signal handlers and insert this one. */
99 current_thread -> signals.signal_func[signo] = func;
100
101 /* Return success! */
102 return(OK);
103 }
104
