memcheck/tests/freebsd/fbsd278566.c

   1 /*-
   2  * Copyright (c) 2024 Rozhuk Ivan <rozhuk.im@gmail.com>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * Author: Rozhuk Ivan <rozhuk.im@gmail.com>
  27  *
  28  */
  29
  30 /*
  31  * From the FreeBSD Bugzilla
  32  * https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278566
  33  */
  34
  35 #include <errno.h>
  36 #include <inttypes.h>
  37 #include <stdio.h>  /* snprintf, fprintf */
  38 #include <string.h> /* memset */
  39 #include <sys/param.h>
  40 #include <sys/sysctl.h>
  41 #include <sys/types.h>
  42
  43 /* cc sysctlbyname_broken.c -O0 -DDEBUG -o sysctlbyname_broken */
  44 /* valgrind --tool=memcheck --leak-check=yes --leak-resolution=high
  45  * --track-origins=yes --undef-value-errors=yes --show-leak-kinds=all
  46  * --track-fds=yes --trace-children=no --vgdb=no --show-reachable=yes --verbose
  47  * --error-exitcode=1 ./sysctlbyname_broken */
  48
  49 /* Syntetic exapmle based on libdrm: xf86drm.c code. */
  50
  51 int main(int argc, char** argv)
  52 {
  53    char   sysctl_name[32], sysctl_val[256];
  54    size_t sysctl_len;
  55
  56    snprintf(sysctl_name, sizeof(sysctl_name), "kern.compiler_version");
  57    sysctl_len = sizeof(sysctl_val);
  58    memset(sysctl_val, 0x00, sizeof(sysctl_val));
  59    if (sysctlbyname(sysctl_name, sysctl_val, &sysctl_len, NULL, 0)) {
  60       fprintf(stdout, "sysctlbyname() - FAIL!\n");
  61    } else if (argc > 1) {
  62       fprintf(stdout, "%s\n", sysctl_val);
  63    }
  64
  65    return (0);
  66 }