Set proctitle: avoid the use of __attribute__((constructor)).

This cased a segfault in some Linux system and was GCC-specific.

Commit modified by @antirez:

1) Stripped away the part to set the proc title via config for now.
2) Handle initialization of setproctitle only when the replacement
   is used.
3) Don't require GCC now that the attribute constructor is no
   longer used.

src/config.h

@@ -114,6 +114,8 @@
 
 #if (defined __linux || defined __APPLE__)
 #define USE_SETPROCTITLE
+#define INIT_SETPROCTITLE_REPLACEMENT
+void spt_init(int argc, char *argv[]);
 void setproctitle(const char *fmt, ...);
 #endif
 

src/redis.c

@@ -2586,16 +2586,23 @@ void redisOutOfMemoryHandler(size_t allocation_size) {
 }
 
 void redisSetProcTitle(char *title) {
+#ifdef USE_SETPROCTITLE
     setproctitle("%s %s:%d",
         title,
         server.bindaddr ? server.bindaddr : "*",
         server.port);
+#else
+    REDIS_NOTUSED(title);
+#endif
 }
 
 int main(int argc, char **argv) {
     struct timeval tv;
 
     /* We need to initialize our libraries, and the server configuration. */
+#ifdef INIT_SETPROCTITLE_REPLACEMENT
+    spt_init(argc, argv);
+#endif
     zmalloc_enable_thread_safeness();
     zmalloc_set_oom_handler(redisOutOfMemoryHandler);
     srand(time(NULL)^getpid());

src/setproctitle.c

@@ -2,6 +2,8 @@
  * setproctitle.c - Linux/Darwin setproctitle.
  * --------------------------------------------------------------------------
  * Copyright (C) 2010  William Ahern
+ * Copyright (C) 2013  Salvatore Sanfilippo
+ * Copyright (C) 2013  Stam He
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the
@@ -42,8 +44,9 @@
 
 
 #if !HAVE_SETPROCTITLE
-#if (defined __linux || defined __APPLE__) && defined __GNUC__
+#if (defined __linux || defined __APPLE__)
 
+extern char **environ;
 
 static struct {
 	/* original value */
@@ -142,9 +145,8 @@ static int spt_copyargs(int argc, char *argv[]) {
 } /* spt_copyargs() */
 
 
-void spt_init(int argc, char *argv[], char *envp[]) __attribute__((constructor));
-
-void spt_init(int argc, char *argv[], char *envp[]) {
+void spt_init(int argc, char *argv[]) {
+        char **envp = environ;
 	char *base, *end, *nul, *tmp;
 	int i, error;