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// SPDX-License-Identifier: MIT
/*
* Copyright © 2023 Google LLC.
* Copyright © 2023 Collabora, Ltd.
* Copyright © 2024 Red Hat, Inc.
* Copyright © 2025 Intel Corporation
*/
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <sys/mount.h>
#include "igt_aux.h"
#include "igt_configfs.h"
/**
* SECTION:igt_configfs
* @short_description: Support code for configfs features
* @title: configfs
* @include: igt_configfs.h
*
* This library provides helpers to access configfs features.
*/
/*
* General configfs helpers
*/
static const char *__igt_configfs_mount(void)
{
if (igt_is_mountpoint("/sys/kernel/config"))
return "/sys/kernel/config";
if (igt_is_mountpoint("/config"))
return "/config";
if (mount("config", "/sys/kernel/config", "configfs", 0, 0))
return NULL;
return "/sys/kernel/config";
}
/**
* igt_configfs_mount:
*
* This attempts to locate where configfs is mounted on the filesystem,
* and if not found, will then try to mount configfs at /sys/kernel/config.
*
* Returns:
* The path to the configfs mount point (e.g. /sys/kernel/config)
*/
const char *igt_configfs_mount(void)
{
static const char *path;
if (!path)
path = __igt_configfs_mount();
return path;
}
/**
* igt_configfs_open: open configfs path
* @name: name of the configfs directory
*
* Opens the configfs directory corresponding to the name
*
* Returns:
* The directory fd, or -1 on failure.
*/
int igt_configfs_open(const char *name)
{
char path[PATH_MAX];
const char *configfs_path;
configfs_path = igt_configfs_mount();
if (!configfs_path) {
igt_debug("configfs not mounted, errno=%d\n", errno);
return -1;
}
snprintf(path, sizeof(path), "%s/%s", configfs_path, name);
return open(path, O_DIRECTORY | O_RDONLY);
}
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