lttng-ctl: add an lttng_event_extended distinct from communication structures

[lttng-tools.git] / src / common / macros.h

diff --git a/src/common/macros.h b/src/common/macros.h
index 8185c85abfdacdece8bd4442cc10ca2898b8bd32..28c21d5b8188ebd786d710cba5c1ceba8132154e 100644 (file)
--- a/src/common/macros.h
+++ b/src/common/macros.h
@@ -20,6 +20,9 @@
 #define _MACROS_H
 
 #include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <common/compat/string.h>
 
 /*
  * Takes a pointer x and transform it so we can use it to access members
@@ -46,10 +49,69 @@
 /*
  * Memory allocation zeroed
  */
-#define zmalloc(x) calloc(1, x)
+static inline
+void *zmalloc(size_t len)
+{
+       return calloc(1, len);
+}
 
 #ifndef ARRAY_SIZE
 #define ARRAY_SIZE(array)   (sizeof(array) / (sizeof((array)[0])))
 #endif
 
+#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
+#define max(a, b) ((a) > (b) ? (a) : (b))
+#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))
+#endif
+
+#ifndef LTTNG_PACKED
+#define LTTNG_PACKED __attribute__((__packed__))
+#endif
+
+/*
+ * LTTNG_HIDDEN: set the hidden attribute for internal functions
+ * On Windows, symbols are local unless explicitly exported,
+ * see https://gcc.gnu.org/wiki/Visibility
+ */
+#if defined(_WIN32) || defined(__CYGWIN__)
+#define LTTNG_HIDDEN
+#else
+#define LTTNG_HIDDEN __attribute__((visibility("hidden")))
+#endif
+
+#define member_sizeof(type, field)     sizeof(((type *) 0)->field)
+
+/*
+ * lttng_strncpy returns 0 on success, or nonzero on failure.
+ * It checks that the @src string fits into @dst_len before performing
+ * the copy. On failure, no copy has been performed.
+ *
+ * dst_len includes the string's trailing NULL.
+ */
+static inline
+int lttng_strncpy(char *dst, const char *src, size_t dst_len)
+{
+       if (lttng_strnlen(src, dst_len) >= dst_len) {
+               /* Fail since copying would result in truncation. */
+               return -1;
+       }
+       strcpy(dst, src);
+       return 0;
+}
+
 #endif /* _MACROS_H */