/*-*- 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 2022 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/prctl.internal.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/sysv/consts/pr.h"
#include "libc/sysv/errfuns.h"

/**
 * Tunes process on Linux.
 *
 * @raise ENOSYS on non-Linux
 */
privileged int prctl(int operation, ...) {
  int rc;
  va_list va;
  intptr_t a, b, c, d;

  va_start(va, operation);
  a = va_arg(va, intptr_t);
  b = va_arg(va, intptr_t);
  c = va_arg(va, intptr_t);
  d = va_arg(va, intptr_t);
  va_end(va);

  if (IsLinux()) {
    rc = sys_prctl(operation, a, b, c, d);
    if (rc < 0) {
      errno = -rc;
      rc = -1;
    }
  } else {
    rc = enosys();
  }

#ifdef SYSDEBUG
  if (operation == PR_CAPBSET_READ || operation == PR_CAPBSET_DROP) {
    STRACE("prctl(%s, %s) â %d% m", DescribePrctlOperation(operation),
           DescribeCapability(a), rc);
  } else {
    STRACE("prctl(%s, %p, %p, %p, %p) â %d% m",
           DescribePrctlOperation(operation), a, b, c, d, rc);
  }
#endif

  return rc;
}
