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/* sp-platform.c
*
* Copyright (C) 2016 Christian Hergert <christian@hergert.me>
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <glib.h>
#include <glib/gstdio.h>
#include <sys/syscall.h>
#include <unistd.h>
#include "util/sp-platform.h"
/**
* sp_memfd_create:
* @name: (nullable): A descriptive name for the memfd or %NULL
*
* Creates a new memfd using the memfd_create syscall if available.
* Otherwise, a tmpfile is used. Currently, no attempt is made to
* ensure the tmpfile is on a tmpfs backed mount.
*
* Returns: An fd if successful; otherwise -1 and errno is set.
*/
int
sp_memfd_create (const gchar *name)
{
#ifdef __NR_memfd_create
if (name == NULL)
name = "[sysprof]";
return syscall (__NR_memfd_create, name, 0);
#else
gchar *name_used = NULL;
int fd;
/*
* TODO: It would be nice to ensure tmpfs
*
* It is not strictly required that the preferred temporary directory
* will be mounted as tmpfs. We should look through the mounts and ensure
* that the tmpfile we open is on tmpfs so that we get anonymous backed
* pages after unlinking.
*/
fd = g_file_open_tmp (NULL, &name_used, NULL);
if (name_used != NULL)
{
g_unlink (name_used);
g_free (name_used);
}
return fd;
#endif
}
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