os/osinit.c

   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 }