/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-â
âvi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :viâ
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â Copyright 2020 Justine Alexandra Roberts Tunney                              â
â                                                                              â
â Permission to use, copy, modify, and/or distribute this software for         â
â any purpose with or without fee is hereby granted, provided that the         â
â above copyright notice and this permission notice appear in all copies.      â
â                                                                              â
â THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                â
â WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                â
â WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             â
â AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         â
â DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        â
â PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               â
â TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             â
â PERFORMANCE OF THIS SOFTWARE.                                                â
ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ*/
#include "libc/calls/calls.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/dce.h"
#include "libc/intrin/_getauxval.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/sysv/consts/auxv.h"

/**
 * Determines if process is tainted.
 *
 * This function returns 1 if process was launched as a result of an
 * execve() call on a binary that had the setuid or setgid bits set.
 * FreeBSD defines tainted as including processes that changed their
 * effective user / group ids at some point.
 *
 * @return always successful, 1 if yes, 0 if no
 */
int issetugid(void) {
  int rc;
  if (IsLinux()) {
    rc = !!_getauxval(AT_SECURE).value;
  } else if (IsMetal()) {
    rc = 0;
  } else {
    rc = sys_issetugid();
  }
  STRACE("issetugid() â %d", rc);
  return rc;
}
