Merge pull request #336 from brauner/2020-02-27/safe_mount

[mirror_lxcfs.git] / macro.h

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#ifndef __LXCFS_MACRO_H
#define __LXCFS_MACRO_H

#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif

#ifndef FUSE_USE_VERSION
#define FUSE_USE_VERSION 26
#endif

#define _FILE_OFFSET_BITS 64

#include <stdio.h>

#include "config.h"

#define BATCH_SIZE 50

/* filesystem magic values */
#ifndef CGROUP_SUPER_MAGIC
#define CGROUP_SUPER_MAGIC 0x27e0eb
#endif

#ifndef CGROUP2_SUPER_MAGIC
#define CGROUP2_SUPER_MAGIC 0x63677270
#endif

#define lxcfs_debug_stream(stream, format, ...)                                \
	do {                                                                   \
		fprintf(stream, "%s: %d: %s: " format "\n", __FILE__, __LINE__,     \
			__func__, ##__VA_ARGS__);                                \
	} while (false)

#define lxcfs_error(format, ...) lxcfs_debug_stream(stderr, format, ##__VA_ARGS__)

#ifdef DEBUG
#define lxcfs_debug(format, ...) lxcfs_error(format, ##__VA_ARGS__)
#else
#define lxcfs_debug(format, ...)
#endif /* DEBUG */

#ifdef VERBOSE
#define lxcfs_v(format, ...) lxcfs_error(format, ##__VA_ARGS__);
#else
#define lxcfs_v(format, ...)
#endif /* VERBOSE */

#define log_error_errno(__ret__, __errno__, format, ...) \
	({						 \
		errno = __errno__;			 \
		lxcfs_error(format, ##__VA_ARGS__);	 \
		__ret__;				 \
	})

#define STRLITERALLEN(x) (sizeof(""x"") - 1)

/* Calculate the number of chars needed to represent a given integer as a C
 * string. Include room for '-' to indicate negative numbers and the \0 byte.
 * This is based on systemd.
 */
#define INTTYPE_TO_STRLEN(type)                   \
	(2 + (sizeof(type) <= 1                   \
		  ? 3                             \
		  : sizeof(type) <= 2             \
			? 5                       \
			: sizeof(type) <= 4       \
			      ? 10                \
			      : sizeof(type) <= 8 \
				    ? 20          \
				    : sizeof(int[-2 * (sizeof(type) > 8)])))

#define ret_errno(__errno__)       \
	({                         \
		errno = __errno__; \
		-__errno__;        \
	})

#define ret_set_errno(__ret__, __errno__) \
	({                                \
		errno = __errno__;        \
		__ret__;                  \
	})

#define lxc_iterate_parts(__iterator, __splitme, __separators)                  \
	for (char *__p = NULL, *__it = strtok_r(__splitme, __separators, &__p); \
	     (__iterator = __it);                                               \
	     __iterator = __it = strtok_r(NULL, __separators, &__p))

#define log_exit(format, ...)                           \
	({                                              \
		fprintf(stderr, format, ##__VA_ARGS__); \
		_exit(EXIT_FAILURE);                    \
	})

#define PTR_TO_UINT64(p) ((uint64_t)((intptr_t)(p)))
#define INTTYPE_TO_PTR(u) ((void *)((intptr_t)(u)))

#endif /* __LXCFS_MACRO_H */