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86dcedfba0
This is a helper to get the page size on various platforms so that calling code does not need to duplicate that effort.
124 lines
4.2 KiB
C
124 lines
4.2 KiB
C
/* sysprof-platform.c
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*
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* Copyright 2016-2019 Christian Hergert <chergert@redhat.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* Subject to the terms and conditions of this license, each copyright holder
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* and contributor hereby grants to those receiving rights under this license
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* a perpetual, worldwide, non-exclusive, no-charge, royalty-free,
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* irrevocable (except for failure to satisfy the conditions of this license)
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* patent license to make, have made, use, offer to sell, sell, import, and
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* otherwise transfer this software, where such license applies only to those
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* patent claims, already acquired or hereafter acquired, licensable by such
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* copyright holder or contributor that are necessarily infringed by:
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*
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* (a) their Contribution(s) (the licensed copyrights of copyright holders
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* and non-copyrightable additions of contributors, in source or binary
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* form) alone; or
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*
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* (b) combination of their Contribution(s) with the work of authorship to
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* which such Contribution(s) was added by such copyright holder or
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* contributor, if, at the time the Contribution is added, such addition
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* causes such combination to be necessarily infringed. The patent license
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* shall not apply to any other combinations which include the
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* Contribution.
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*
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* Except as expressly stated above, no rights or licenses from any copyright
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* holder or contributor is granted under this license, whether expressly, by
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* implication, estoppel or otherwise.
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*
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* DISCLAIMER
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* SPDX-License-Identifier: BSD-2-Clause-Patent
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*/
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#define G_LOG_DOMAIN "sysprof-platform"
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#include "config.h"
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#include <glib.h>
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#include <glib/gstdio.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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#include "sysprof-capture-util-private.h"
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#include "sysprof-platform.h"
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/**
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* sysprof_memfd_create:
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* @name: (nullable): A descriptive name for the memfd or %NULL
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*
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* Creates a new memfd using the memfd_create syscall if available.
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* Otherwise, a tmpfile is used. Currently, no attempt is made to
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* ensure the tmpfile is on a tmpfs backed mount.
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*
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* Returns: An fd if successful; otherwise -1 and errno is set.
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*/
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int
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sysprof_memfd_create (const gchar *name)
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{
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#ifdef __NR_memfd_create
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if (name == NULL)
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name = "[sysprof]";
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return syscall (__NR_memfd_create, name, 0);
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#else
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gchar *name_used = NULL;
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int fd;
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/*
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* TODO: It would be nice to ensure tmpfs
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*
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* It is not strictly required that the preferred temporary directory
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* will be mounted as tmpfs. We should look through the mounts and ensure
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* that the tmpfile we open is on tmpfs so that we get anonymous backed
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* pages after unlinking.
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*/
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fd = g_file_open_tmp (NULL, &name_used, NULL);
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if (name_used != NULL)
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{
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g_unlink (name_used);
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g_free (name_used);
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}
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return fd;
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#endif
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}
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/**
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* sysprof_getpagesize:
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*
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* Gets the page size using platform specific APIs.
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*
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* Returns: the system page size
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*
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* Since: 3.36
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*/
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gsize
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sysprof_getpagesize (void)
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{
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return _sysprof_getpagesize ();
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}
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