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66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* sp-platform.c
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*
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* Copyright (C) 2016 Christian Hergert <christian@hergert.me>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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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 "sp-platform.h"
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/**
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* sp_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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sp_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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