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a09e091a JB |
1 | /* |
2 | * Copyright 2002-2003 Red Hat Inc., Durham, North Carolina. | |
3 | * | |
4 | * All Rights Reserved. | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining | |
7 | * a copy of this software and associated documentation files (the | |
8 | * "Software"), to deal in the Software without restriction, including | |
9 | * without limitation on the rights to use, copy, modify, merge, | |
10 | * publish, distribute, sublicense, and/or sell copies of the Software, | |
11 | * and to permit persons to whom the Software is furnished to do so, | |
12 | * subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice (including the | |
15 | * next paragraph) shall be included in all copies or substantial | |
16 | * portions of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
19 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
20 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
21 | * NON-INFRINGEMENT. IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS | |
22 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
23 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
25 | * SOFTWARE. | |
26 | */ | |
27 | ||
28 | /* | |
29 | * Authors: | |
30 | * Rickard E. (Rik) Faith <faith@redhat.com> | |
31 | * | |
32 | */ | |
33 | ||
34 | /** \file | |
35 | * | |
36 | * Provides an interface for handling SIGIO signals for input devices. */ | |
37 | ||
38 | #ifdef HAVE_DMX_CONFIG_H | |
39 | #include <dmx-config.h> | |
40 | #endif | |
41 | ||
42 | #include "inputstr.h" | |
43 | #include "dmxinputinit.h" | |
44 | #include "dmxsigio.h" | |
45 | #include "dmxevents.h" | |
46 | #include <signal.h> | |
47 | #include <unistd.h> | |
48 | #include <fcntl.h> | |
49 | ||
50 | static int dmxFdCount = 0; | |
51 | static Bool dmxInputEnabled = TRUE; | |
52 | ||
53 | /* Define equivalents for non-POSIX systems (e.g., SGI IRIX, Solaris) */ | |
54 | #ifndef O_ASYNC | |
55 | #ifdef FASYNC | |
56 | #define O_ASYNC FASYNC | |
57 | #else | |
58 | #define O_ASYNC 0 | |
59 | #endif | |
60 | #endif | |
61 | #ifndef O_NONBLOCK | |
62 | #define O_NONBLOCK FNONBLK | |
63 | #endif | |
64 | ||
65 | static void | |
66 | dmxSigioHandler(int sig) | |
67 | { | |
68 | int i, j; | |
69 | DMXInputInfo *dmxInput; | |
70 | ||
71 | for (i = 0, dmxInput = &dmxInputs[0]; i < dmxNumInputs; i++, dmxInput++) { | |
72 | if (dmxInput->sigioState == DMX_ACTIVESIGIO) { | |
73 | for (j = 0; j < dmxInput->numDevs; j++) { | |
74 | DMXLocalInputInfoPtr dmxLocal = dmxInput->devs[j]; | |
75 | ||
76 | if (dmxLocal->collect_events) { | |
77 | dmxLocal->collect_events(&dmxLocal->pDevice->public, | |
78 | dmxMotion, | |
79 | dmxEnqueue, | |
80 | dmxCheckSpecialKeys, DMX_NO_BLOCK); | |
81 | } | |
82 | } | |
83 | } | |
84 | } | |
85 | } | |
86 | ||
87 | static void | |
88 | dmxSigioHook(void) | |
89 | { | |
90 | struct sigaction a; | |
91 | sigset_t s; | |
92 | ||
93 | memset(&a, 0, sizeof(a)); | |
94 | a.sa_handler = dmxSigioHandler; | |
95 | sigemptyset(&a.sa_mask); | |
96 | sigaddset(&a.sa_mask, SIGIO); | |
97 | sigaddset(&a.sa_mask, SIGALRM); | |
98 | sigaddset(&a.sa_mask, SIGVTALRM); | |
99 | sigaction(SIGIO, &a, 0); | |
100 | ||
101 | sigemptyset(&s); | |
102 | sigprocmask(SIG_SETMASK, &s, 0); | |
103 | } | |
104 | ||
105 | static void | |
106 | dmxSigioUnhook(void) | |
107 | { | |
108 | struct sigaction a; | |
109 | ||
110 | memset(&a, 0, sizeof(a)); | |
111 | a.sa_handler = SIG_IGN; | |
112 | sigemptyset(&a.sa_mask); | |
113 | sigaction(SIGIO, &a, 0); | |
114 | } | |
115 | ||
116 | static void | |
117 | dmxSigioAdd(DMXInputInfo * dmxInput) | |
118 | { | |
119 | int flags; | |
120 | int i; | |
121 | ||
122 | switch (dmxInput->sigioState) { | |
123 | case DMX_NOSIGIO: | |
124 | return; | |
125 | case DMX_USESIGIO: | |
126 | dmxInput->sigioState = DMX_ACTIVESIGIO; | |
127 | break; | |
128 | case DMX_ACTIVESIGIO: | |
129 | return; | |
130 | } | |
131 | ||
132 | for (i = 0; i < dmxInput->sigioFdCount; i++) { | |
133 | if (!dmxInput->sigioAdded[i]) { | |
134 | int fd = dmxInput->sigioFd[i]; | |
135 | ||
136 | fcntl(fd, F_SETOWN, getpid()); | |
137 | flags = fcntl(fd, F_GETFL); | |
138 | flags |= O_ASYNC | O_NONBLOCK; | |
139 | fcntl(fd, F_SETFL, flags); | |
140 | ||
141 | AddEnabledDevice(fd); | |
142 | dmxInput->sigioAdded[i] = TRUE; | |
143 | ||
144 | if (++dmxFdCount == 1) | |
145 | dmxSigioHook(); | |
146 | } | |
147 | } | |
148 | } | |
149 | ||
150 | static void | |
151 | dmxSigioRemove(DMXInputInfo * dmxInput) | |
152 | { | |
153 | int flags; | |
154 | int i; | |
155 | ||
156 | switch (dmxInput->sigioState) { | |
157 | case DMX_NOSIGIO: | |
158 | return; | |
159 | case DMX_USESIGIO: | |
160 | return; | |
161 | case DMX_ACTIVESIGIO: | |
162 | dmxInput->sigioState = DMX_USESIGIO; | |
163 | break; | |
164 | } | |
165 | ||
166 | for (i = 0; i < dmxInput->sigioFdCount; i++) { | |
167 | if (dmxInput->sigioAdded[i]) { | |
168 | int fd = dmxInput->sigioFd[i]; | |
169 | ||
170 | dmxInput->sigioAdded[i] = FALSE; | |
171 | RemoveEnabledDevice(fd); | |
172 | ||
173 | flags = fcntl(fd, F_GETFL); | |
174 | flags &= ~(O_ASYNC | O_NONBLOCK); | |
175 | fcntl(fd, F_SETFL, flags); | |
176 | ||
177 | if (!--dmxFdCount) | |
178 | dmxSigioUnhook(); | |
179 | } | |
180 | } | |
181 | } | |
182 | ||
183 | /** Enable SIGIO handling. This instantiates the handler with the OS. */ | |
184 | void | |
185 | dmxSigioEnableInput(void) | |
186 | { | |
187 | int i; | |
188 | DMXInputInfo *dmxInput; | |
189 | ||
190 | dmxInputEnabled = TRUE; | |
191 | for (i = 0, dmxInput = &dmxInputs[0]; i < dmxNumInputs; i++, dmxInput++) | |
192 | dmxSigioAdd(dmxInput); | |
193 | } | |
194 | ||
195 | /** Disable SIGIO handling. This removes the hanlder from the OS. */ | |
196 | void | |
197 | dmxSigioDisableInput(void) | |
198 | { | |
199 | int i; | |
200 | DMXInputInfo *dmxInput; | |
201 | ||
202 | dmxInputEnabled = FALSE; | |
203 | for (i = 0, dmxInput = &dmxInputs[0]; i < dmxNumInputs; i++, dmxInput++) | |
204 | dmxSigioRemove(dmxInput); | |
205 | } | |
206 | ||
207 | /** Make a note that the input device described in \a dmxInput will be | |
208 | * using the file descriptor \a fd for SIGIO signals. Calls | |
209 | * AddEnabledDevice ifi SIGIO handling has been enabled with | |
210 | * #dmxSigioEnableInput(). */ | |
211 | void | |
212 | dmxSigioRegister(DMXInputInfo * dmxInput, int fd) | |
213 | { | |
214 | dmxInput->sigioState = DMX_USESIGIO; | |
215 | if (dmxInput->sigioFdCount >= DMX_MAX_SIGIO_FDS) | |
216 | dmxLog(dmxFatal, "Too many SIGIO file descriptors (%d >= %d)\n", | |
217 | dmxInput->sigioFdCount, DMX_MAX_SIGIO_FDS); | |
218 | ||
219 | dmxInput->sigioFd[dmxInput->sigioFdCount++] = fd; | |
220 | if (dmxInputEnabled) | |
221 | dmxSigioAdd(dmxInput); | |
222 | } | |
223 | ||
224 | /** Remove the notes that \a dmxInput is using any file descriptors for | |
225 | * SIGIO signals. Calls RemoveEnabledDevice. */ | |
226 | void | |
227 | dmxSigioUnregister(DMXInputInfo * dmxInput) | |
228 | { | |
229 | if (dmxInput->sigioState == DMX_NOSIGIO) | |
230 | return; | |
231 | dmxSigioRemove(dmxInput); | |
232 | dmxInput->sigioState = DMX_NOSIGIO; | |
233 | dmxInput->sigioFdCount = 0; | |
234 | } |