commit 4198fa4c23fc8a1895808a597bb153530f6ea515
author Elliott Hughes <enh@google.com> Mon Sep 17 15:23:35 2012 -0700
committer Elliott Hughes <enh@google.com> Mon Sep 17 15:23:35 2012 -0700
tree 79a050550930720fba3886064bd95acc10944f11
parent 4e9d953a0e9334c0f3519f470b97973c31da5bb6

Don't copy strerror(3) or strsignal(3) strings if we can share.

Change-Id: Ic405269f63b945c6fb347e7c4346cd6f104aff35

libc/bionic/strsignal.cpp

diff --git a/libc/bionic/strsignal.cpp b/libc/bionic/strsignal.cpp
index 1cbec9b..9b046d4 100644
--- a/libc/bionic/strsignal.cpp
+++ b/libc/bionic/strsignal.cpp
@@ -29,11 +29,18 @@
 #include <string.h>
 #include "ThreadLocalBuffer.h"
 
+extern "C" const char* __strsignal_lookup(int);
 extern "C" const char* __strsignal(int, char*, size_t);
 
 GLOBAL_INIT_THREAD_LOCAL_BUFFER(strsignal);
 
 char* strsignal(int signal_number) {
+  // Just return the original constant in the easy cases.
+  char* result = const_cast<char*>(__strsignal_lookup(signal_number));
+  if (result != NULL) {
+    return result;
+  }
+
   LOCAL_INIT_THREAD_LOCAL_BUFFER(char*, strsignal, NL_TEXTMAX);
   return const_cast<char*>(__strsignal(signal_number, strsignal_buffer, strsignal_buffer_size));
 }