kc3-lang/gnulib/tests/qemu.h

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• Hash : a747e037
  Author :
  Date : 2025-05-07T11:34:47
  

  Add syntax-check rule against CPU predef misspellings.
  
  * lib/getloadavg.c: Test __alpha, not __alpha__.
  * tests/test-snan-2.c: Likewise.
  * m4/exponentd.m4: Test __arm__, not __arm.
  * lib/utimensat.c: Test __hppa, not __hppa__.
  * tests/qemu.h: Likewise.
  * lib/fma.c: Test __sparc, not __sparc__.
  * tests/qemu.h: Likewise.
  * tests/test-exp2.h: Likewise.
  * tests/test-nonblocking-pipe.h: Likewise.
  * tests/test-snan-1.c: Likewise.
  * tests/test-snan-2.c: Likewise.
  

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• tests/qemu.h

• /* Determine whether the current process is running under QEMU.
     Copyright (C) 2021-2025 Free Software Foundation, Inc.
  
     This file is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as
     published by the Free Software Foundation; either version 2.1 of the
     License, or (at your option) any later version.
  
     This file is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Bruno Haible <bruno@clisp.org>, 2021.  */
  
  #ifdef __linux__
  # include <fcntl.h>
  # include <string.h>
  # include <unistd.h>
  #endif
  
  /* This function determines whether the current process is running under QEMU
     (user-mode).
  
     It does so by looking at parts of the environment that QEMU does not emulate
     100% perfectly well.
  
     For comparison, the techniques given in the paper
       Thomas Raffetseder, Christopher Kruegel, Engin Kirda
       "Detecting System Emulators"
       2007
       https://publik.tuwien.ac.at/files/pub-inf_5317.pdf
     apply to both the QEMU system mode and QEMU user mode.  */
  
  static bool
  is_running_under_qemu_user (void)
  {
  #ifdef __linux__
    char buf[4096 + 1];
    int fd;
  
  # if defined __m68k__
    fd = open ("/proc/hardware", O_RDONLY);
    if (fd >= 0)
      {
        int n = read (fd, buf, sizeof (buf) - 1);
        close (fd);
        if (n > 0)
          {
            buf[n] = '\0';
            if (strstr (buf, "qemu") != NULL)
              return true;
          }
      }
  # endif
  
    fd = open ("/proc/cpuinfo", O_RDONLY);
    if (fd >= 0)
      {
        int n = read (fd, buf, sizeof (buf) - 1);
        close (fd);
        if (n > 0)
          {
            buf[n] = '\0';
  # if defined __hppa
            if (strstr (buf, "QEMU") != NULL)
              return true;
  # endif
  # if !(defined __i386__ || defined __x86_64__)
            if (strstr (buf, "AuthenticAMD") != NULL
                || strstr (buf, "GenuineIntel") != NULL)
              return true;
  # endif
  # if !(defined __arm__ || defined __aarch64__)
            if (strstr (buf, "ARM") != NULL
                || strcasestr (buf, "aarch64") != NULL)
              return true;
  # endif
  # if !defined __sparc
            if (strcasestr (buf, "SPARC") != NULL)
              return true;
  # endif
  # if !defined __powerpc__
            if (strstr (buf, "POWER") != NULL)
              return true;
  # endif
          }
      }
  
    /* If you need more heuristics, look at system calls that are not perfectly
       well emulated in qemu/linux-user/syscall.c.  */
  #endif
  
    return false;
  }
  

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