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/* sysprof-platform.c
*
* Copyright 2016-2019 Christian Hergert <chergert@redhat.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Subject to the terms and conditions of this license, each copyright holder
* and contributor hereby grants to those receiving rights under this license
* a perpetual, worldwide, non-exclusive, no-charge, royalty-free,
* irrevocable (except for failure to satisfy the conditions of this license)
* patent license to make, have made, use, offer to sell, sell, import, and
* otherwise transfer this software, where such license applies only to those
* patent claims, already acquired or hereafter acquired, licensable by such
* copyright holder or contributor that are necessarily infringed by:
*
* (a) their Contribution(s) (the licensed copyrights of copyright holders
* and non-copyrightable additions of contributors, in source or binary
* form) alone; or
*
* (b) combination of their Contribution(s) with the work of authorship to
* which such Contribution(s) was added by such copyright holder or
* contributor, if, at the time the Contribution is added, such addition
* causes such combination to be necessarily infringed. The patent license
* shall not apply to any other combinations which include the
* Contribution.
*
* Except as expressly stated above, no rights or licenses from any copyright
* holder or contributor is granted under this license, whether expressly, by
* implication, estoppel or otherwise.
*
* DISCLAIMER
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/syscall.h>
#include <unistd.h>
#include "sysprof-capture-util-private.h"
#include "sysprof-platform.h"
#ifndef __NR_memfd_create
static const char *
get_tmpdir (void)
{
const char *tmpdir = NULL;
if (tmpdir == NULL || *tmpdir == '\0')
tmpdir = getenv ("TMPDIR");
#ifdef P_tmpdir
if (tmpdir == NULL || *tmpdir == '\0')
tmpdir = P_tmpdir;
#endif
if (tmpdir == NULL || *tmpdir == '\0')
tmpdir = "/tmp";
return tmpdir;
}
#endif /* !__NR_memfd_create */
/**
* sysprof_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
sysprof_memfd_create (const char *name)
{
#ifdef __NR_memfd_create
if (name == NULL)
name = "[sysprof]";
return syscall (__NR_memfd_create, name, 0);
#else
int fd;
int flags;
const char *tmpdir;
char *template = NULL;
size_t template_len = 0;
/*
* 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.
*/
tmpdir = get_tmpdir ();
template_len = strlen (tmpdir) + 1 + strlen ("sysprof-XXXXXX") + 1;
template = sysprof_malloc0 (template_len);
if (template == NULL)
{
errno = ENOMEM;
return -1;
}
snprintf (template, template_len, "%s/sysprof-XXXXXX", tmpdir);
#ifdef __APPLE__
flags = 0;
#else
flags = O_BINARY | O_CLOEXEC;
#endif
fd = TEMP_FAILURE_RETRY (mkostemp (template, flags));
if (fd < 0)
{
free (template);
return -1;
}
unlink (template);
free (template);
return fd;
#endif
}
/**
* sysprof_getpagesize:
*
* Gets the page size using platform specific APIs.
*
* Returns: the system page size
*
* Since: 3.36
*/
size_t
sysprof_getpagesize (void)
{
return _sysprof_getpagesize ();
}
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