/* anonfile.c - open and close temporary files (anonymous and memory-backed if possible). */

/* Copyright (C) 2023 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Bash 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Bash.  If not, see <http://www.gnu.org/licenses/>.
*/
   
#include <config.h>

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif
#include <bashtypes.h>

#if defined (HAVE_MEMFD_CREATE) || defined (HAVE_SHM_OPEN) || defined (HAVE_SHM_MKSTEMP)
#  include <sys/mman.h>
#endif
#include <filecntl.h>

#include <errno.h>

#include <shell.h>
#include <bashansi.h>

/* Placeholder for future use of memfd_create/shm_open/shm_mkstemp */

static int
anonunlink (const char *fn)
{
  int r;

  r = unlink (fn);
  return r;
}

int
anonopen (const char *name, int flags, char **fn)
{
  int fd, flag;

  /* Heuristic */
  flag = (name && *name == '/') ? MT_TEMPLATE : MT_USETMPDIR;
  fd = sh_mktmpfd (name, flag|MT_USERANDOM|MT_READWRITE|MT_UNLINK, fn);
  return fd;
}

int
anonclose (int fd, const char *name)
{
  int r;

  r = close (fd);
  return r;
}