[deb_xorg-server.git] / hw / xfree86 / os-support / shared / sigio.c

/* sigio.c -- Support for SIGIO handler installation and removal
 * Created: Thu Jun  3 15:39:18 1999 by faith@precisioninsight.com
 *
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 * 
 * Authors: Rickard E. (Rik) Faith <faith@valinux.com>
 */
/*
 * Copyright (c) 2002 by The XFree86 Project, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of the copyright holder(s)
 * and author(s) shall not be used in advertising or otherwise to promote
 * the sale, use or other dealings in this Software without prior written
 * authorization from the copyright holder(s) and author(s).
 */

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif

#include <X11/X.h>
#include "xf86.h"
#include "xf86Priv.h"
#include "xf86_OSlib.h"
#include "inputstr.h"

#ifdef HAVE_STROPTS_H
#include <stropts.h>
#endif

#ifdef MAXDEVICES
/* MAXDEVICES represents the maximimum number of input devices usable
 * at the same time plus one entry for DRM support.
 */
#define MAX_FUNCS   (MAXDEVICES + 1)
#else
#define MAX_FUNCS 16
#endif

typedef struct _xf86SigIOFunc {
    void (*f) (int, void *);
    int fd;
    void *closure;
} Xf86SigIOFunc;

static Xf86SigIOFunc xf86SigIOFuncs[MAX_FUNCS];
static int xf86SigIOMax;
static int xf86SigIOMaxFd;
static fd_set xf86SigIOMask;

/*
 * SIGIO gives no way of discovering which fd signalled, select
 * to discover
 */
static void
xf86SIGIO(int sig)
{
    int i;
    fd_set ready;
    struct timeval to;
    int save_errno = errno;     /* do not clobber the global errno */
    int r;

    inSignalContext = TRUE;

    ready = xf86SigIOMask;
    to.tv_sec = 0;
    to.tv_usec = 0;
    SYSCALL(r = select(xf86SigIOMaxFd, &ready, 0, 0, &to));
    for (i = 0; r > 0 && i < xf86SigIOMax; i++)
        if (xf86SigIOFuncs[i].f && FD_ISSET(xf86SigIOFuncs[i].fd, &ready)) {
            (*xf86SigIOFuncs[i].f) (xf86SigIOFuncs[i].fd,
                                    xf86SigIOFuncs[i].closure);
            r--;
        }
    if (r > 0) {
        xf86Msg(X_ERROR, "SIGIO %d descriptors not handled\n", r);
    }
    /* restore global errno */
    errno = save_errno;

    inSignalContext = FALSE;
}

static int
xf86IsPipe(int fd)
{
    struct stat buf;

    if (fstat(fd, &buf) < 0)
        return 0;
    return S_ISFIFO(buf.st_mode);
}

int
xf86InstallSIGIOHandler(int fd, void (*f) (int, void *), void *closure)
{
    struct sigaction sa;
    struct sigaction osa;
    int i;
    int installed = FALSE;

    if (!xf86Info.useSIGIO)
        return 0;

    for (i = 0; i < MAX_FUNCS; i++) {
        if (!xf86SigIOFuncs[i].f) {
            if (xf86IsPipe(fd))
                return 0;
            OsBlockSIGIO();
#ifdef O_ASYNC
            if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_ASYNC) == -1) {
                xf86Msg(X_WARNING, "fcntl(%d, O_ASYNC): %s\n",
                        fd, strerror(errno));
            }
            else {
                if (fcntl(fd, F_SETOWN, getpid()) == -1) {
                    xf86Msg(X_WARNING, "fcntl(%d, F_SETOWN): %s\n",
                            fd, strerror(errno));
                }
                else {
                    installed = TRUE;
                }
            }
#endif
#ifdef I_SETSIG                 /* System V Streams - used on Solaris for input devices */
            if (!installed && isastream(fd)) {
                if (ioctl(fd, I_SETSIG, S_INPUT | S_ERROR | S_HANGUP) == -1) {
                    xf86Msg(X_WARNING, "fcntl(%d, I_SETSIG): %s\n",
                            fd, strerror(errno));
                }
                else {
                    installed = TRUE;
                }
            }
#endif
            if (!installed) {
                OsReleaseSIGIO();
                return 0;
            }
            sigemptyset(&sa.sa_mask);
            sigaddset(&sa.sa_mask, SIGIO);
            sa.sa_flags = 0;
            sa.sa_handler = xf86SIGIO;
            sigaction(SIGIO, &sa, &osa);
            xf86SigIOFuncs[i].fd = fd;
            xf86SigIOFuncs[i].closure = closure;
            xf86SigIOFuncs[i].f = f;
            if (i >= xf86SigIOMax)
                xf86SigIOMax = i + 1;
            if (fd >= xf86SigIOMaxFd)
                xf86SigIOMaxFd = fd + 1;
            FD_SET(fd, &xf86SigIOMask);
            OsReleaseSIGIO();
            return 1;
        }
        /* Allow overwriting of the closure and callback */
        else if (xf86SigIOFuncs[i].fd == fd) {
            xf86SigIOFuncs[i].closure = closure;
            xf86SigIOFuncs[i].f = f;
            return 1;
        }
    }
    return 0;
}

int
xf86RemoveSIGIOHandler(int fd)
{
    struct sigaction sa;
    struct sigaction osa;
    int i;
    int max;
    int maxfd;
    int ret;

    if (!xf86Info.useSIGIO)
        return 0;

    max = 0;
    maxfd = -1;
    ret = 0;
    for (i = 0; i < MAX_FUNCS; i++) {
        if (xf86SigIOFuncs[i].f) {
            if (xf86SigIOFuncs[i].fd == fd) {
                xf86SigIOFuncs[i].f = 0;
                xf86SigIOFuncs[i].fd = 0;
                xf86SigIOFuncs[i].closure = 0;
                FD_CLR(fd, &xf86SigIOMask);
                ret = 1;
            }
            else {
                max = i + 1;
                if (xf86SigIOFuncs[i].fd >= maxfd)
                    maxfd = xf86SigIOFuncs[i].fd + 1;
            }
        }
    }
    if (ret) {
#ifdef O_ASYNC
        fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_ASYNC);
#endif
#ifdef I_SETSIG
        if (isastream(fd)) {
            if (ioctl(fd, I_SETSIG, 0) == -1) {
                xf86Msg(X_WARNING, "fcntl(%d, I_SETSIG, 0): %s\n",
                        fd, strerror(errno));
            }
        }
#endif
        xf86SigIOMax = max;
        xf86SigIOMaxFd = maxfd;
        if (!max) {
            sigemptyset(&sa.sa_mask);
            sigaddset(&sa.sa_mask, SIGIO);
            sa.sa_flags = 0;
            sa.sa_handler = SIG_IGN;
            sigaction(SIGIO, &sa, &osa);
        }
    }
    return ret;
}

int
xf86BlockSIGIO(void)
{
    return OsBlockSIGIO();
}

void
xf86UnblockSIGIO(int wasset)
{
    OsReleaseSIGIO();
}

void
xf86AssertBlockedSIGIO(char *where)
{
    sigset_t set, old;

    sigemptyset(&set);
    sigprocmask(SIG_BLOCK, &set, &old);
    if (!sigismember(&old, SIGIO))
        xf86Msg(X_ERROR, "SIGIO not blocked at %s\n", where);
}

/* XXX This is a quick hack for the benefit of xf86SetSilkenMouse() */

int
xf86SIGIOSupported(void)
{
    return 1;
}
Commit	Line	Data
a09e091a JB	1	/* sigio.c -- Support for SIGIO handler installation and removal
	2	* Created: Thu Jun 3 15:39:18 1999 by faith@precisioninsight.com
	3	*
	4	* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
	5	* All Rights Reserved.
	6	*
	7	* Permission is hereby granted, free of charge, to any person obtaining a
	8	* copy of this software and associated documentation files (the "Software"),
	9	* to deal in the Software without restriction, including without limitation
	10	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	11	* and/or sell copies of the Software, and to permit persons to whom the
	12	* Software is furnished to do so, subject to the following conditions:
	13	*
	14	* The above copyright notice and this permission notice (including the next
	15	* paragraph) shall be included in all copies or substantial portions of the
	16	* Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	21	* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	22	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	23	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
	24	* DEALINGS IN THE SOFTWARE.
	25	*
	26	* Authors: Rickard E. (Rik) Faith <faith@valinux.com>
	27	*/
	28	/*
	29	* Copyright (c) 2002 by The XFree86 Project, Inc.
	30	*
	31	* Permission is hereby granted, free of charge, to any person obtaining a
	32	* copy of this software and associated documentation files (the "Software"),
	33	* to deal in the Software without restriction, including without limitation
	34	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	35	* and/or sell copies of the Software, and to permit persons to whom the
	36	* Software is furnished to do so, subject to the following conditions:
	37	*
	38	* The above copyright notice and this permission notice shall be included in
	39	* all copies or substantial portions of the Software.
	40	*
	41	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	42	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	43	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	44	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	45	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	46	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	47	* OTHER DEALINGS IN THE SOFTWARE.
	48	*
	49	* Except as contained in this notice, the name of the copyright holder(s)
	50	* and author(s) shall not be used in advertising or otherwise to promote
	51	* the sale, use or other dealings in this Software without prior written
	52	* authorization from the copyright holder(s) and author(s).
	53	*/
	54
	55	#ifdef HAVE_XORG_CONFIG_H
	56	#include <xorg-config.h>
	57	#endif
	58
	59	#include <X11/X.h>
	60	#include "xf86.h"
	61	#include "xf86Priv.h"
	62	#include "xf86_OSlib.h"
	63	#include "inputstr.h"
	64
65	#ifdef HAVE_STROPTS_H
66	#include <stropts.h>
67	#endif
68
69	#ifdef MAXDEVICES
70	/* MAXDEVICES represents the maximimum number of input devices usable
71	* at the same time plus one entry for DRM support.
72	*/
73	#define MAX_FUNCS (MAXDEVICES + 1)
74	#else
75	#define MAX_FUNCS 16
76	#endif
77
78	typedef struct _xf86SigIOFunc {
79	void (f) (int, void );
80	int fd;
81	void *closure;
82	} Xf86SigIOFunc;
83
84	static Xf86SigIOFunc xf86SigIOFuncs[MAX_FUNCS];
85	static int xf86SigIOMax;
86	static int xf86SigIOMaxFd;
87	static fd_set xf86SigIOMask;
88
89	/*
90	* SIGIO gives no way of discovering which fd signalled, select
91	* to discover
92	*/
93	static void
94	xf86SIGIO(int sig)
95	{
96	int i;
97	fd_set ready;
98	struct timeval to;
99	int save_errno = errno; /* do not clobber the global errno */
100	int r;
101
102	inSignalContext = TRUE;
103
104	ready = xf86SigIOMask;
105	to.tv_sec = 0;
106	to.tv_usec = 0;
107	SYSCALL(r = select(xf86SigIOMaxFd, &ready, 0, 0, &to));
108	for (i = 0; r > 0 && i < xf86SigIOMax; i++)
109	if (xf86SigIOFuncs[i].f && FD_ISSET(xf86SigIOFuncs[i].fd, &ready)) {
110	(*xf86SigIOFuncs[i].f) (xf86SigIOFuncs[i].fd,
111	xf86SigIOFuncs[i].closure);
112	r--;
113	}
114	if (r > 0) {
115	xf86Msg(X_ERROR, "SIGIO %d descriptors not handled\n", r);
116	}
117	/* restore global errno */
118	errno = save_errno;
119
120	inSignalContext = FALSE;
121	}
122
123	static int
124	xf86IsPipe(int fd)
125	{
126	struct stat buf;
127
128	if (fstat(fd, &buf) < 0)
129	return 0;
130	return S_ISFIFO(buf.st_mode);
131	}
132
133	int
134	xf86InstallSIGIOHandler(int fd, void (f) (int, void ), void *closure)
135	{
136	struct sigaction sa;
137	struct sigaction osa;
138	int i;
139	int installed = FALSE;
140
141	if (!xf86Info.useSIGIO)
142	return 0;
143
144	for (i = 0; i < MAX_FUNCS; i++) {
145	if (!xf86SigIOFuncs[i].f) {
146	if (xf86IsPipe(fd))
147	return 0;
148	OsBlockSIGIO();
149	#ifdef O_ASYNC
150	if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) \| O_ASYNC) == -1) {
151	xf86Msg(X_WARNING, "fcntl(%d, O_ASYNC): %s\n",
152	fd, strerror(errno));
153	}
154	else {
155	if (fcntl(fd, F_SETOWN, getpid()) == -1) {
156	xf86Msg(X_WARNING, "fcntl(%d, F_SETOWN): %s\n",
157	fd, strerror(errno));
158	}
159	else {
160	installed = TRUE;
161	}
162	}
163	#endif
164	#ifdef I_SETSIG /* System V Streams - used on Solaris for input devices */
165	if (!installed && isastream(fd)) {
166	if (ioctl(fd, I_SETSIG, S_INPUT \| S_ERROR \| S_HANGUP) == -1) {
167	xf86Msg(X_WARNING, "fcntl(%d, I_SETSIG): %s\n",
168	fd, strerror(errno));
169	}
170	else {
171	installed = TRUE;
172	}
173	}
174	#endif
175	if (!installed) {
176	OsReleaseSIGIO();
177	return 0;
178	}
179	sigemptyset(&sa.sa_mask);
180	sigaddset(&sa.sa_mask, SIGIO);
181	sa.sa_flags = 0;
182	sa.sa_handler = xf86SIGIO;
183	sigaction(SIGIO, &sa, &osa);
184	xf86SigIOFuncs[i].fd = fd;
185	xf86SigIOFuncs[i].closure = closure;
186	xf86SigIOFuncs[i].f = f;
187	if (i >= xf86SigIOMax)
188	xf86SigIOMax = i + 1;
189	if (fd >= xf86SigIOMaxFd)
190	xf86SigIOMaxFd = fd + 1;
191	FD_SET(fd, &xf86SigIOMask);
192	OsReleaseSIGIO();
193	return 1;
194	}
195	/* Allow overwriting of the closure and callback */
196	else if (xf86SigIOFuncs[i].fd == fd) {
197	xf86SigIOFuncs[i].closure = closure;
198	xf86SigIOFuncs[i].f = f;
199	return 1;
200	}
201	}
202	return 0;
203	}
204
205	int
206	xf86RemoveSIGIOHandler(int fd)
207	{
208	struct sigaction sa;
209	struct sigaction osa;
210	int i;
211	int max;
212	int maxfd;
213	int ret;
214
215	if (!xf86Info.useSIGIO)
216	return 0;
217
218	max = 0;
219	maxfd = -1;
220	ret = 0;
221	for (i = 0; i < MAX_FUNCS; i++) {
222	if (xf86SigIOFuncs[i].f) {
223	if (xf86SigIOFuncs[i].fd == fd) {
224	xf86SigIOFuncs[i].f = 0;
225	xf86SigIOFuncs[i].fd = 0;
226	xf86SigIOFuncs[i].closure = 0;
227	FD_CLR(fd, &xf86SigIOMask);
228	ret = 1;
229	}
230	else {
231	max = i + 1;
232	if (xf86SigIOFuncs[i].fd >= maxfd)
233	maxfd = xf86SigIOFuncs[i].fd + 1;
234	}
235	}
236	}
237	if (ret) {
238	#ifdef O_ASYNC
239	fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_ASYNC);
240	#endif
241	#ifdef I_SETSIG
242	if (isastream(fd)) {
243	if (ioctl(fd, I_SETSIG, 0) == -1) {
244	xf86Msg(X_WARNING, "fcntl(%d, I_SETSIG, 0): %s\n",
245	fd, strerror(errno));
246	}
247	}
248	#endif
249	xf86SigIOMax = max;
250	xf86SigIOMaxFd = maxfd;
251	if (!max) {
252	sigemptyset(&sa.sa_mask);
253	sigaddset(&sa.sa_mask, SIGIO);
254	sa.sa_flags = 0;
255	sa.sa_handler = SIG_IGN;
256	sigaction(SIGIO, &sa, &osa);
257	}
258	}
259	return ret;
260	}
261
262	int
263	xf86BlockSIGIO(void)
264	{
265	return OsBlockSIGIO();
266	}
267
268	void
269	xf86UnblockSIGIO(int wasset)
270	{
271	OsReleaseSIGIO();
272	}
273
274	void
275	xf86AssertBlockedSIGIO(char *where)
276	{
277	sigset_t set, old;
278
279	sigemptyset(&set);
280	sigprocmask(SIG_BLOCK, &set, &old);
281	if (!sigismember(&old, SIGIO))
282	xf86Msg(X_ERROR, "SIGIO not blocked at %s\n", where);
283	}
284
285	/* XXX This is a quick hack for the benefit of xf86SetSilkenMouse() */
286
287	int
288	xf86SIGIOSupported(void)
289	{
290	return 1;
291	}