| 1 | /*********************************************************** |
| 2 | |
| 3 | Copyright 1987, 1998 The Open Group |
| 4 | |
| 5 | Permission to use, copy, modify, distribute, and sell this software and its |
| 6 | documentation for any purpose is hereby granted without fee, provided that |
| 7 | the above copyright notice appear in all copies and that both that |
| 8 | copyright notice and this permission notice appear in supporting |
| 9 | documentation. |
| 10 | |
| 11 | The above copyright notice and this permission notice shall be included in |
| 12 | all copies or substantial portions of the Software. |
| 13 | |
| 14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 15 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 16 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 17 | OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
| 18 | AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 19 | CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 20 | |
| 21 | Except as contained in this notice, the name of The Open Group shall not be |
| 22 | used in advertising or otherwise to promote the sale, use or other dealings |
| 23 | in this Software without prior written authorization from The Open Group. |
| 24 | |
| 25 | Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts. |
| 26 | |
| 27 | All Rights Reserved |
| 28 | |
| 29 | Permission to use, copy, modify, and distribute this software and its |
| 30 | documentation for any purpose and without fee is hereby granted, |
| 31 | provided that the above copyright notice appear in all copies and that |
| 32 | both that copyright notice and this permission notice appear in |
| 33 | supporting documentation, and that the name of Digital not be |
| 34 | used in advertising or publicity pertaining to distribution of the |
| 35 | software without specific, written prior permission. |
| 36 | |
| 37 | DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING |
| 38 | ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL |
| 39 | DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR |
| 40 | ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, |
| 41 | WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, |
| 42 | ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| 43 | SOFTWARE. |
| 44 | |
| 45 | ******************************************************************/ |
| 46 | |
| 47 | #ifdef HAVE_DIX_CONFIG_H |
| 48 | #include <dix-config.h> |
| 49 | #endif |
| 50 | |
| 51 | #include <stdio.h> |
| 52 | #include <X11/X.h> |
| 53 | #include "os.h" |
| 54 | #include "osdep.h" |
| 55 | #include <X11/Xos.h> |
| 56 | #include <signal.h> |
| 57 | #include <errno.h> |
| 58 | #ifdef HAVE_DLFCN_H |
| 59 | #include <dlfcn.h> |
| 60 | #endif |
| 61 | #ifdef HAVE_BACKTRACE |
| 62 | #include <execinfo.h> |
| 63 | #endif |
| 64 | |
| 65 | #include "misc.h" |
| 66 | |
| 67 | #include "dixstruct.h" |
| 68 | |
| 69 | #if !defined(SYSV) && !defined(WIN32) |
| 70 | #include <sys/resource.h> |
| 71 | #endif |
| 72 | |
| 73 | #ifndef ADMPATH |
| 74 | #define ADMPATH "/usr/adm/X%smsgs" |
| 75 | #endif |
| 76 | |
| 77 | extern char *display; |
| 78 | |
| 79 | #ifdef RLIMIT_DATA |
| 80 | int limitDataSpace = -1; |
| 81 | #endif |
| 82 | #ifdef RLIMIT_STACK |
| 83 | int limitStackSpace = -1; |
| 84 | #endif |
| 85 | #ifdef RLIMIT_NOFILE |
| 86 | int limitNoFile = -1; |
| 87 | #endif |
| 88 | |
| 89 | static OsSigWrapperPtr OsSigWrapper = NULL; |
| 90 | |
| 91 | OsSigWrapperPtr |
| 92 | OsRegisterSigWrapper(OsSigWrapperPtr newSigWrapper) |
| 93 | { |
| 94 | OsSigWrapperPtr oldSigWrapper = OsSigWrapper; |
| 95 | |
| 96 | OsSigWrapper = newSigWrapper; |
| 97 | |
| 98 | return oldSigWrapper; |
| 99 | } |
| 100 | |
| 101 | /* |
| 102 | * OsSigHandler -- |
| 103 | * Catch unexpected signals and exit or continue cleanly. |
| 104 | */ |
| 105 | #if !defined(WIN32) || defined(__CYGWIN__) |
| 106 | static void |
| 107 | #ifdef SA_SIGINFO |
| 108 | OsSigHandler(int signo, siginfo_t * sip, void *unused) |
| 109 | #else |
| 110 | OsSigHandler(int signo) |
| 111 | #endif |
| 112 | { |
| 113 | #ifdef RTLD_DI_SETSIGNAL |
| 114 | const char *dlerr = dlerror(); |
| 115 | |
| 116 | if (dlerr) { |
| 117 | LogMessageVerbSigSafe(X_ERROR, 1, "Dynamic loader error: %s\n", dlerr); |
| 118 | } |
| 119 | #endif /* RTLD_DI_SETSIGNAL */ |
| 120 | |
| 121 | if (OsSigWrapper != NULL) { |
| 122 | if (OsSigWrapper(signo) == 0) { |
| 123 | /* ddx handled signal and wants us to continue */ |
| 124 | return; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | /* log, cleanup, and abort */ |
| 129 | xorg_backtrace(); |
| 130 | |
| 131 | #ifdef SA_SIGINFO |
| 132 | if (sip->si_code == SI_USER) { |
| 133 | ErrorFSigSafe("Received signal %u sent by process %u, uid %u\n", signo, |
| 134 | sip->si_pid, sip->si_uid); |
| 135 | } |
| 136 | else { |
| 137 | switch (signo) { |
| 138 | case SIGSEGV: |
| 139 | case SIGBUS: |
| 140 | case SIGILL: |
| 141 | case SIGFPE: |
| 142 | ErrorFSigSafe("%s at address %p\n", strsignal(signo), sip->si_addr); |
| 143 | } |
| 144 | } |
| 145 | #endif |
| 146 | |
| 147 | FatalError("Caught signal %d (%s). Server aborting\n", |
| 148 | signo, strsignal(signo)); |
| 149 | } |
| 150 | #endif /* !WIN32 || __CYGWIN__ */ |
| 151 | |
| 152 | #include "busfault.h" |
| 153 | |
| 154 | void |
| 155 | OsInit(void) |
| 156 | { |
| 157 | static Bool been_here = FALSE; |
| 158 | static const char *devnull = "/dev/null"; |
| 159 | char fname[PATH_MAX]; |
| 160 | |
| 161 | if (!been_here) { |
| 162 | #if !defined(WIN32) || defined(__CYGWIN__) |
| 163 | struct sigaction act, oact; |
| 164 | int i; |
| 165 | |
| 166 | int siglist[] = { SIGSEGV, SIGQUIT, SIGILL, SIGFPE, SIGBUS, |
| 167 | SIGSYS, |
| 168 | SIGXCPU, |
| 169 | SIGXFSZ, |
| 170 | #ifdef SIGEMT |
| 171 | SIGEMT, |
| 172 | #endif |
| 173 | 0 /* must be last */ |
| 174 | }; |
| 175 | sigemptyset(&act.sa_mask); |
| 176 | #ifdef SA_SIGINFO |
| 177 | act.sa_sigaction = OsSigHandler; |
| 178 | act.sa_flags = SA_SIGINFO; |
| 179 | #else |
| 180 | act.sa_handler = OsSigHandler; |
| 181 | act.sa_flags = 0; |
| 182 | #endif |
| 183 | for (i = 0; siglist[i] != 0; i++) { |
| 184 | if (sigaction(siglist[i], &act, &oact)) { |
| 185 | ErrorF("failed to install signal handler for signal %d: %s\n", |
| 186 | siglist[i], strerror(errno)); |
| 187 | } |
| 188 | } |
| 189 | #endif /* !WIN32 || __CYGWIN__ */ |
| 190 | #ifdef BUSFAULT |
| 191 | busfault_init(); |
| 192 | #endif |
| 193 | |
| 194 | #ifdef HAVE_BACKTRACE |
| 195 | /* |
| 196 | * initialize the backtracer, since the ctor calls dlopen(), which |
| 197 | * calls malloc(), which isn't signal-safe. |
| 198 | */ |
| 199 | do { |
| 200 | void *array; |
| 201 | |
| 202 | backtrace(&array, 1); |
| 203 | } while (0); |
| 204 | #endif |
| 205 | |
| 206 | #ifdef RTLD_DI_SETSIGNAL |
| 207 | /* Tell runtime linker to send a signal we can catch instead of SIGKILL |
| 208 | * for failures to load libraries/modules at runtime so we can clean up |
| 209 | * after ourselves. |
| 210 | */ |
| 211 | int failure_signal = SIGQUIT; |
| 212 | |
| 213 | dlinfo(RTLD_SELF, RTLD_DI_SETSIGNAL, &failure_signal); |
| 214 | #endif |
| 215 | |
| 216 | #if !defined(XQUARTZ) /* STDIN is already /dev/null and STDOUT/STDERR is managed by console_redirect.c */ |
| 217 | # if defined(__APPLE__) |
| 218 | int devnullfd = open(devnull, O_RDWR, 0); |
| 219 | assert(devnullfd > 2); |
| 220 | |
| 221 | dup2(devnullfd, STDIN_FILENO); |
| 222 | dup2(devnullfd, STDOUT_FILENO); |
| 223 | close(devnullfd); |
| 224 | # elif !defined(__CYGWIN__) |
| 225 | fclose(stdin); |
| 226 | fclose(stdout); |
| 227 | # endif |
| 228 | /* |
| 229 | * If a write of zero bytes to stderr returns non-zero, i.e. -1, |
| 230 | * then writing to stderr failed, and we'll write somewhere else |
| 231 | * instead. (Apparently this never happens in the Real World.) |
| 232 | */ |
| 233 | if (write(2, fname, 0) == -1) { |
| 234 | FILE *err; |
| 235 | |
| 236 | if (strlen(display) + strlen(ADMPATH) + 1 < sizeof fname) |
| 237 | snprintf(fname, sizeof(fname), ADMPATH, display); |
| 238 | else |
| 239 | strcpy(fname, devnull); |
| 240 | /* |
| 241 | * uses stdio to avoid os dependencies here, |
| 242 | * a real os would use |
| 243 | * open (fname, O_WRONLY|O_APPEND|O_CREAT, 0666) |
| 244 | */ |
| 245 | if (!(err = fopen(fname, "a+"))) |
| 246 | err = fopen(devnull, "w"); |
| 247 | if (err && (fileno(err) != 2)) { |
| 248 | dup2(fileno(err), 2); |
| 249 | fclose(err); |
| 250 | } |
| 251 | #if defined(SYSV) || defined(SVR4) || defined(WIN32) || defined(__CYGWIN__) |
| 252 | { |
| 253 | static char buf[BUFSIZ]; |
| 254 | |
| 255 | setvbuf(stderr, buf, _IOLBF, BUFSIZ); |
| 256 | } |
| 257 | #else |
| 258 | setlinebuf(stderr); |
| 259 | #endif |
| 260 | } |
| 261 | #endif /* !XQUARTZ */ |
| 262 | |
| 263 | #if !defined(WIN32) || defined(__CYGWIN__) |
| 264 | if (getpgrp() == 0) |
| 265 | setpgid(0, 0); |
| 266 | #endif |
| 267 | |
| 268 | #ifdef RLIMIT_DATA |
| 269 | if (limitDataSpace >= 0) { |
| 270 | struct rlimit rlim; |
| 271 | |
| 272 | if (!getrlimit(RLIMIT_DATA, &rlim)) { |
| 273 | if ((limitDataSpace > 0) && (limitDataSpace < rlim.rlim_max)) |
| 274 | rlim.rlim_cur = limitDataSpace; |
| 275 | else |
| 276 | rlim.rlim_cur = rlim.rlim_max; |
| 277 | (void) setrlimit(RLIMIT_DATA, &rlim); |
| 278 | } |
| 279 | } |
| 280 | #endif |
| 281 | #ifdef RLIMIT_STACK |
| 282 | if (limitStackSpace >= 0) { |
| 283 | struct rlimit rlim; |
| 284 | |
| 285 | if (!getrlimit(RLIMIT_STACK, &rlim)) { |
| 286 | if ((limitStackSpace > 0) && (limitStackSpace < rlim.rlim_max)) |
| 287 | rlim.rlim_cur = limitStackSpace; |
| 288 | else |
| 289 | rlim.rlim_cur = rlim.rlim_max; |
| 290 | (void) setrlimit(RLIMIT_STACK, &rlim); |
| 291 | } |
| 292 | } |
| 293 | #endif |
| 294 | #ifdef RLIMIT_NOFILE |
| 295 | if (limitNoFile >= 0) { |
| 296 | struct rlimit rlim; |
| 297 | |
| 298 | if (!getrlimit(RLIMIT_NOFILE, &rlim)) { |
| 299 | if ((limitNoFile > 0) && (limitNoFile < rlim.rlim_max)) |
| 300 | rlim.rlim_cur = limitNoFile; |
| 301 | else |
| 302 | rlim.rlim_cur = rlim.rlim_max; |
| 303 | (void) setrlimit(RLIMIT_NOFILE, &rlim); |
| 304 | } |
| 305 | } |
| 306 | #endif |
| 307 | LockServer(); |
| 308 | been_here = TRUE; |
| 309 | } |
| 310 | TimerInit(); |
| 311 | OsVendorInit(); |
| 312 | OsResetSignals(); |
| 313 | /* |
| 314 | * No log file by default. OsVendorInit() should call LogInit() with the |
| 315 | * log file name if logging to a file is desired. |
| 316 | */ |
| 317 | LogInit(NULL, NULL); |
| 318 | SmartScheduleInit(); |
| 319 | } |
| 320 | |
| 321 | void |
| 322 | OsCleanup(Bool terminating) |
| 323 | { |
| 324 | if (terminating) { |
| 325 | UnlockServer(); |
| 326 | } |
| 327 | } |