X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fcommon%2Fmacros.h;h=7530c912a98251160b608e0bc0b4bf4daefff42e;hb=3afa94aeca5a0daae40fd7b6cc96b7e4c150c7d8;hp=0e11d3c7ac2f8179ea98bda74293c91158d6b2c2;hpb=639082d2871a0cd0cca3d77fd72fb51002f0c4bf;p=lttng-tools.git

diff --git a/src/common/macros.h b/src/common/macros.h
index 0e11d3c7a..7530c912a 100644
--- a/src/common/macros.h
+++ b/src/common/macros.h
@@ -1,25 +1,16 @@
 /*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
  *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #ifndef _MACROS_H
 #define _MACROS_H
 
 #include <stdlib.h>
+#include <stddef.h>
 #include <string.h>
 #include <common/compat/string.h>
 
@@ -58,26 +49,58 @@ void *zmalloc(size_t len)
 #define ARRAY_SIZE(array)   (sizeof(array) / (sizeof((array)[0])))
 #endif
 
-#ifndef max
-#define max(a, b) ((a) > (b) ? (a) : (b))
+#ifndef container_of
+#define container_of(ptr, type, member)					\
+	({								\
+		const typeof(((type *)NULL)->member) * __ptr = (ptr);	\
+		(type *)((char *)__ptr - offsetof(type, member));	\
+	})
 #endif
 
-#ifndef max_t
-#define max_t(type, a, b)	((type) max(a, b))
-#endif
 
-#ifndef min
-#define min(a, b) ((a) < (b) ? (a) : (b))
+/*
+ * The min and max macros are not needed in C++ (std::min and std::max are
+ * preferred) and they conflict with some C++ header file. Don't define them
+ * when compiling C++ source.
+ */
+#ifndef __cplusplus
+
+# ifndef max
+#  define max(a, b) ((a) > (b) ? (a) : (b))
+# endif
+
+# ifndef min
+#  define min(a, b) ((a) < (b) ? (a) : (b))
+# endif
+
+# ifndef max_t
+#  define max_t(type, a, b)	max((type) a, (type) b)
+# endif
+
+# ifndef min_t
+#  define min_t(type, a, b)	min((type) a, (type) b)
+# endif
+
 #endif
 
 #ifndef LTTNG_PACKED
 #define LTTNG_PACKED __attribute__((__packed__))
 #endif
 
-#ifndef LTTNG_HIDDEN
-#define LTTNG_HIDDEN __attribute__((visibility("hidden")))
+#ifndef LTTNG_NO_SANITIZE_ADDRESS
+#if defined(__clang__) || defined (__GNUC__)
+#define LTTNG_NO_SANITIZE_ADDRESS __attribute__((no_sanitize_address))
+#else
+#define LTTNG_NO_SANITIZE_ADDRESS
+#endif
 #endif
 
+#define is_signed(type) (((type) -1) < (type) 1)
+
+#define member_sizeof(type, field)	sizeof(((type *) 0)->field)
+
+#define ASSERT_LOCKED(lock) LTTNG_ASSERT(pthread_mutex_trylock(&lock))
+
 /*
  * lttng_strncpy returns 0 on success, or nonzero on failure.
  * It checks that the @src string fits into @dst_len before performing
@@ -88,18 +111,23 @@ void *zmalloc(size_t len)
 static inline
 int lttng_strncpy(char *dst, const char *src, size_t dst_len)
 {
-	if (lttng_strnlen(src, dst_len) == dst_len) {
+	if (lttng_strnlen(src, dst_len) >= dst_len) {
 		/* Fail since copying would result in truncation. */
 		return -1;
 	}
-	strncpy(dst, src, dst_len);
-	/*
-	 * Be extra careful and put final \0 at the end after strncpy(),
-	 * even though we checked the length before. This makes Coverity
-	 * happy.
-	 */
-	dst[dst_len - 1] = '\0';
+	strcpy(dst, src);
 	return 0;
 }
 
+#ifdef NDEBUG
+/*
+* Force usage of the assertion condition to prevent unused variable warnings
+* when `assert()` are disabled by the `NDEBUG` definition.
+*/
+# define LTTNG_ASSERT(_cond) ((void) sizeof((void) (_cond), 0))
+#else
+# include <assert.h>
+# define LTTNG_ASSERT(_cond) assert(_cond)
+#endif
+
 #endif /* _MACROS_H */