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2aa62f2b | 1 | /** @file\r |
2 | Implementation of the signal and raise functions as declared in <signal.h>.\r | |
3 | \r | |
4 | Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials are licensed and made available under\r | |
6 | the terms and conditions of the BSD License that accompanies this distribution.\r | |
7 | The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php.\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | #include <Uefi.h>\r | |
15 | #include <Library/UefiLib.h>\r | |
16 | \r | |
17 | #include <LibConfig.h>\r | |
18 | #include <errno.h>\r | |
19 | #include <signal.h>\r | |
20 | #include <MainData.h>\r | |
21 | \r | |
22 | /** The signal function associates a "signal handler" with a signal number.\r | |
23 | \r | |
24 | The signal function chooses one of three ways in which receipt of the\r | |
25 | signal number, sig, is to be subsequently handled. If the value of func\r | |
26 | is SIG_DFL, default handling for that signal will occur. If the value of\r | |
27 | func is SIG_IGN, the signal will be ignored. Otherwise, func shall point\r | |
28 | to a function to be called when that signal occurs. An invocation of such a\r | |
29 | function because of a signal, or (recursively) of any further functions\r | |
30 | called by that invocation (other than functions in the standard library),\r | |
31 | is called a signal handler.\r | |
32 | \r | |
33 | At program startup, the equivalent of signal(sig, SIG_IGN); may be executed\r | |
34 | for some signals selected in an implementation-defined manner; the\r | |
35 | equivalent of signal(sig, SIG_DFL); is executed for all other signals\r | |
36 | defined by the implementation.\r | |
37 | \r | |
38 | @return If the request can be honored, the signal function returns the\r | |
39 | value of func for the most recent successful call to signal for\r | |
40 | the specified signal sig. Otherwise, a value of SIG_ERR is\r | |
41 | returned and a positive value is stored in errno.\r | |
42 | */\r | |
43 | __sighandler_t *\r | |
44 | signal(int sig, __sighandler_t *func)\r | |
45 | {\r | |
46 | __sighandler_t *OldHandler;\r | |
47 | \r | |
48 | if (sig < 0 || sig >= SIG_LAST) {\r | |
49 | errno = EINVAL;\r | |
50 | return SIG_ERR;\r | |
51 | }\r | |
52 | OldHandler = gMD->sigarray[sig];\r | |
53 | gMD->sigarray[sig] = func;\r | |
54 | \r | |
55 | return OldHandler;\r | |
56 | }\r | |
57 | \r | |
58 | static\r | |
59 | void\r | |
60 | _defaultSignalHandler( int sig )\r | |
61 | {\r | |
62 | Print(L"\nCaught signal %d.\n", sig);\r | |
63 | }\r | |
64 | \r | |
65 | /** Send a signal.\r | |
66 | \r | |
67 | The raise function carries out the actions described for signal, above,\r | |
68 | for the signal sig.\r | |
69 | \r | |
70 | If a signal handler is called, the raise function shall not return until\r | |
71 | after the signal handler does.\r | |
72 | \r | |
73 | @return The raise function returns zero if successful,\r | |
74 | nonzero if unsuccessful.\r | |
75 | **/\r | |
76 | int\r | |
77 | raise( int sig)\r | |
78 | {\r | |
79 | __sighandler_t *Handler;\r | |
80 | \r | |
81 | if (sig < 0 || sig >= SIG_LAST) {\r | |
82 | return EINVAL;\r | |
83 | }\r | |
84 | Handler = gMD->sigarray[sig];\r | |
85 | \r | |
86 | if(Handler == SIG_DFL) {\r | |
87 | _defaultSignalHandler( sig );\r | |
88 | }\r | |
89 | else if( Handler != SIG_IGN) {\r | |
90 | Handler( sig );\r | |
91 | }\r | |
92 | return 0;\r | |
93 | }\r |