TLA  Line data    Source code

       1                 : /*-------------------------------------------------------------------------
       2                 :  *
       3                 :  * assert.c
       4                 :  *    Assert support code.
       5                 :  *
       6                 :  * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
       7                 :  * Portions Copyright (c) 1994, Regents of the University of California
       8                 :  *
       9                 :  *
      10                 :  * IDENTIFICATION
      11                 :  *    src/backend/utils/error/assert.c
      12                 :  *
      13                 :  *-------------------------------------------------------------------------
      14                 :  */
      15                 : #include "postgres.h"
      16                 : 
      17                 : #include <unistd.h>
      18                 : #ifdef HAVE_EXECINFO_H
      19                 : #include <execinfo.h>
      20                 : #endif
      21                 : 
      22                 : /*
      23                 :  * ExceptionalCondition - Handles the failure of an Assert()
      24                 :  *
      25                 :  * We intentionally do not go through elog() here, on the grounds of
      26                 :  * wanting to minimize the amount of infrastructure that has to be
      27                 :  * working to report an assertion failure.
      28                 :  */
      29                 : void
      30 UBC           0 : ExceptionalCondition(const char *conditionName,
      31                 :                      const char *fileName,
      32                 :                      int lineNumber)
      33                 : {
      34 EUB             :     /* Report the failure on stderr (or local equivalent) */
      35 UBC           0 :     if (!PointerIsValid(conditionName)
      36 UNC           0 :         || !PointerIsValid(fileName))
      37 UIC           0 :         write_stderr("TRAP: ExceptionalCondition: bad arguments in PID %d\n",
      38 UBC           0 :                      (int) getpid());
      39 EUB             :     else
      40 UNC           0 :         write_stderr("TRAP: failed Assert(\"%s\"), File: \"%s\", Line: %d, PID: %d\n",
      41               0 :                      conditionName, fileName, lineNumber, (int) getpid());
      42                 : 
      43                 :     /* Usually this shouldn't be needed, but make sure the msg went out */
      44 UIC           0 :     fflush(stderr);
      45                 : 
      46                 :     /* If we have support for it, dump a simple backtrace */
      47                 : #ifdef HAVE_BACKTRACE_SYMBOLS
      48                 :     {
      49 EUB             :         void       *buf[100];
      50                 :         int         nframes;
      51                 : 
      52 UIC           0 :         nframes = backtrace(buf, lengthof(buf));
      53               0 :         backtrace_symbols_fd(buf, nframes, fileno(stderr));
      54                 :     }
      55                 : #endif
      56                 : 
      57                 :     /*
      58                 :      * If configured to do so, sleep indefinitely to allow user to attach a
      59                 :      * debugger.  It would be nice to use pg_usleep() here, but that can sleep
      60                 :      * at most 2G usec or ~33 minutes, which seems too short.
      61                 :      */
      62                 : #ifdef SLEEP_ON_ASSERT
      63 EUB             :     sleep(1000000);
      64                 : #endif
      65                 : 
      66 UIC           0 :     abort();
      67                 : }