diff options
Diffstat (limited to 'hw/xfree86/os-support/shared/sigio.c')
| -rw-r--r-- | hw/xfree86/os-support/shared/sigio.c | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/hw/xfree86/os-support/shared/sigio.c b/hw/xfree86/os-support/shared/sigio.c new file mode 100644 index 000000000..077c566a6 --- /dev/null +++ b/hw/xfree86/os-support/shared/sigio.c @@ -0,0 +1,277 @@ +/* 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> + * + * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/shared/sigio.c,v 1.14 2002/05/05 19:18:14 herrb Exp $ + * + */ + + +#ifdef XFree86Server +# include "X.h" +# include "xf86.h" +# include "xf86drm.h" +# include "xf86Priv.h" +# include "xf86_OSlib.h" +# include "xf86drm.h" +# include "inputstr.h" +#else +# include <unistd.h> +# include <signal.h> +# include <fcntl.h> +# include <sys/time.h> +# include <errno.h> +# include <stdio.h> +# include <string.h> +# define SYSCALL(call) while(((call) == -1) && (errno == EINTR)) +#endif + +/* + * Linux libc5 defines FASYNC, but not O_ASYNC. Don't know if it is + * functional or not. + */ +#if defined(FASYNC) && !defined(O_ASYNC) +# define O_ASYNC FASYNC +#endif + +#ifdef MAX_DEVICES +/* MAX_DEVICES represents the maximimum number of input devices usable + * at the same time plus one entry for DRM support. + */ +# define MAX_FUNCS (MAX_DEVICES + 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 r; + + 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--; + } +#ifdef XFree86Server + if (r > 0) { + xf86Msg(X_ERROR, "SIGIO %d descriptors not handled\n", r); + } +#endif +} + +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 blocked; + + for (i = 0; i < MAX_FUNCS; i++) + { + if (!xf86SigIOFuncs[i].f) + { + if (xf86IsPipe (fd)) + return 0; + blocked = xf86BlockSIGIO(); + if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_ASYNC) == -1) { +#ifdef XFree86Server + xf86Msg(X_WARNING, "fcntl(%d, O_ASYNC): %s\n", + fd, strerror(errno)); +#else + fprintf(stderr,"fcntl(%d, O_ASYNC): %s\n", + fd, strerror(errno)); +#endif + xf86UnblockSIGIO(blocked); + return 0; + } + if (fcntl(fd, F_SETOWN, getpid()) == -1) { +#ifdef XFree86Server + xf86Msg(X_WARNING, "fcntl(%d, F_SETOWN): %s\n", + fd, strerror(errno)); +#else + fprintf(stderr,"fcntl(%d, F_SETOWN): %s\n", + fd, strerror(errno)); +#endif + 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); + xf86UnblockSIGIO(blocked); + 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; + + 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) + { + fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_ASYNC); + xf86SigIOMax = max; + xf86SigIOMaxFd = maxfd; + if (!max) + { + sigemptyset(&sa.sa_mask); + sigaddset(&sa.sa_mask, SIGIO); + sa.sa_flags = 0; + sa.sa_handler = SIG_DFL; + sigaction(SIGIO, &sa, &osa); + } + } + return ret; +} + +int +xf86BlockSIGIO (void) +{ + sigset_t set, old; + + sigemptyset (&set); + sigaddset (&set, SIGIO); + sigprocmask (SIG_BLOCK, &set, &old); + return sigismember (&old, SIGIO); +} + +void +xf86UnblockSIGIO (int wasset) +{ + sigset_t set; + + if (!wasset) + { + sigemptyset (&set); + sigaddset (&set, SIGIO); + sigprocmask (SIG_UNBLOCK, &set, NULL); + } +} + +#ifdef XFree86Server +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; +} + +#endif |