Fail if nd_push_buffer() or nd_push_snaplen() fails.

[tcpdump] / funcattrs.h

diff --git a/funcattrs.h b/funcattrs.h
index 8ac08c4458db7c9adf83b3c4009439564cee6cae..12c8cb12bcc0363b4a96b8647a5ab83ad26bca92 100644 (file)
--- a/funcattrs.h
+++ b/funcattrs.h
@@ -45,7 +45,7 @@
 /*
  * This was introduced by Clang:
  *
- *     http://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
+ *     https://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
  *
  * in some version (which version?); it has been picked up by GCC 5.0.
  */
@@ -104,6 +104,19 @@
   #define NORETURN_FUNCPTR
 #endif
 
+/*
+ * WARN_UNUSED_RESULT, before a function declaration, means "the caller
+ * should use the result of this function" (even if it's just a success/
+ * failure indication).
+ */
+#if __has_attribute(warn_unused_result) \
+    || ND_IS_AT_LEAST_GNUC_VERSION(3,4) \
+    || ND_IS_AT_LEAST_HP_C_VERSION(6,25)
+  #define WARN_UNUSED_RESULT __attribute((warn_unused_result))
+#else
+  #define WARN_UNUSED_RESULT
+#endif
+
 /*
  * PRINTFLIKE(x,y), after a function declaration, means "this function
  * does printf-style formatting, with the xth argument being the format
@@ -124,15 +137,30 @@
   /*
    * However, GCC didn't support that for function *pointers* until GCC
    * 4.1.0; see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3481.
+   * XL C 16.1 (and possibly some earlier versions, but not 12.1 or 13.1) has
+   * a similar bug, the bugfix for which was made in:
+   * * version 16.1.1.8 for Linux (25 June 2020), which fixes
+   *   https://www.ibm.com/support/pages/apar/LI81402
+   * * version 16.1.0.5 for AIX (5 May 2020), which fixes
+   *   https://www.ibm.com/support/pages/apar/IJ24678
+   *
+   * When testing versions, keep in mind that XL C 16.1 pretends to be both
+   * GCC 4.2 and Clang 4.0 at once.
    */
-  #if (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) < 401))
-    #define PRINTFLIKE_FUNCPTR(x,y)
-  #else
+  #if (ND_IS_AT_LEAST_GNUC_VERSION(4,1) \
+       && !ND_IS_AT_LEAST_XL_C_VERSION(10,1)) \
+      || (ND_IS_AT_LEAST_XL_C_VERSION(16,1) \
+          && (ND_IS_AT_LEAST_XL_C_MODFIX(1, 8) && defined(__linux__)) \
+              || (ND_IS_AT_LEAST_XL_C_MODFIX(0, 5) && defined(_AIX)))
     #define PRINTFLIKE_FUNCPTR(x,y) __attribute__((__format__(__printf__,x,y)))
   #endif
-#else
-  #define PRINTFLIKE(x,y)
-  #define PRINTFLIKE_FUNCPTR(x,y)
+#endif
+
+#if !defined(PRINTFLIKE)
+#define PRINTFLIKE(x,y)
+#endif
+#if !defined(PRINTFLIKE_FUNCPTR)
+#define PRINTFLIKE_FUNCPTR(x,y)
 #endif
 
 /*