gprofng: Use prototype to call libc functions

libcollector may not link against libC.
We use dlsym() to get a function from libc.
In some files, pointers to these functions do not have prototypes.
I also moved the shared definitions to libcollector/collect.h.

gprofng/ChangeLog
2023-03-15  Vladimir Mezentsev  <vladimir.mezentsev@oracle.com>

	libcollector/collector.c: Add prototypes.
	libcollector/dispatcher.c: Likewise.
	libcollector/heaptrace.c: Likewise.
	libcollector/iotrace.c: Likewise.
	libcollector/linetrace.c: Likewise.
	libcollector/mmaptrace.c: Likewise.
	libcollector/synctrace.c: Likewise.
	libcollector/collector.h: Add CALL_REAL(), NULL_PTR(), and DBG_LT.

8 files changed, 150 insertions, 174 deletions

diff --git a/gprofng/libcollector/collector.c b/gprofng/libcollector/collector.c
index 55c52548b4e..df493658df9 100644
--- a/gprofng/libcollector/collector.c
+++ b/gprofng/libcollector/collector.c
@@ -37,12 +37,6 @@
 #include "cc_libcollector.h"
 #include "tsd.h"
 
-/* TprintfT(<level>,...) definitions.  Adjust per module as needed */
-#define DBG_LT0 0 // for high-level configuration, unexpected errors/warnings
-#define DBG_LT1 1 // for configuration details, warnings
-#define DBG_LT2 2
-#define DBG_LT3 3
-
 typedef unsigned long ulong_t;
 
 extern char **environ;
@@ -2455,11 +2449,8 @@ __collector_dlog (int tflag, int level, char *format, ...)
  */
 /*------------------------------------------------------------- _exit */
 
-#define CALL_REAL(x) (*(int(*)())__real_##x)
-#define NULL_PTR(x) ( __real_##x == NULL )
-
-static void *__real__exit = NULL; /* libc only: _exit */
-static void *__real__Exit = NULL; /* libc only: _Exit */
+static void (*__real__exit) (int status) = NULL; /* libc only: _exit */
+static void (*__real__Exit) (int status) = NULL; /* libc only: _Exit */
 void _exit () __attribute__ ((weak, alias ("__collector_exit")));
 void _Exit () __attribute__ ((weak, alias ("__collector_Exit")));
 
diff --git a/gprofng/libcollector/collector.h b/gprofng/libcollector/collector.h
index d771cf1d07a..77957ec537d 100644
--- a/gprofng/libcollector/collector.h
+++ b/gprofng/libcollector/collector.h
@@ -29,6 +29,8 @@
 #include "collector_module.h"
 
 #define GETRELTIME()    (__collector_gethrtime() - __collector_start_time)
+#define CALL_REAL(x)	(__real_##x)
+#define NULL_PTR(x)	(__real_##x == NULL)
 
 #if defined(__MUSL_LIBC)
 #define dlvsym(f, nm, v)  dlsym (f, nm)
@@ -171,6 +173,17 @@ enum
   SP_DUMP_STACK     = 32,
 };
 
+/* TprintfT(<level>,...) definitions.  Adjust per module as needed */
+enum
+{
+  DBG_LT0 = 0, // for high-level configuration, unexpected errors/warnings
+  DBG_LTT = 0, // for interposition on GLIBC functions
+  DBG_LT1 = 1, // for configuration details, warnings
+  DBG_LT2 = 2,
+  DBG_LT3 = 3,
+  DBG_LT4 = 4
+};
+
 #ifndef DEBUG
 #define DprintfT(flag, ...)
 #define tprintf(...)
diff --git a/gprofng/libcollector/dispatcher.c b/gprofng/libcollector/dispatcher.c
index 0075f232cc8..5c5a06ec1b4 100644
--- a/gprofng/libcollector/dispatcher.c
+++ b/gprofng/libcollector/dispatcher.c
@@ -41,18 +41,10 @@
 #include "collector_module.h"
 #include "tsd.h"
 #include "hwcdrv.h"
-
-
-/* TprintfT(<level>,...) definitions.  Adjust per module as needed */
-#define DBG_LT0 0 // for high-level configuration, unexpected errors/warnings
-#define DBG_LTT 0 // for interposition on GLIBC functions
-#define DBG_LT1 1 // for configuration details, warnings
-#define DBG_LT2 2
-#define DBG_LT3 3
+#include "memmgr.h"
 
 static void collector_sigprof_dispatcher (int, siginfo_t*, void*);
 static int init_interposition_intf ();
-#include "memmgr.h"
 static int collector_timer_create (timer_t * ptimerid);
 static int collector_timer_settime (int period, timer_t timerid);
 static int collector_timer_gettime (timer_t timerid);
@@ -61,20 +53,28 @@ static timer_t collector_master_thread_timerid = NULL;
 static collector_mutex_t collector_clone_libc_lock = COLLECTOR_MUTEX_INITIALIZER;
 static unsigned dispatcher_key = COLLECTOR_TSD_INVALID_KEY;
 
-static void *__real_clone = NULL;
-static void *__real_timer_create = NULL;
-static void *__real_timer_settime = NULL;
-static void *__real_timer_delete = NULL;
-static void *__real_timer_gettime = NULL;
+static int (*__real_clone) (int (*fn)(void *), void *child_stack, int flags,
+			    void *arg, ...) = NULL;
+static int (*__real_timer_create) (clockid_t clockid,
+				struct sigevent *sevp, timer_t *timerid) = NULL;
+static int (*__real_timer_settime) (timer_t timerid, int flags,
+				    const struct itimerspec *new_value,
+				    struct itimerspec *old_value) = NULL;
+static int (*__real_timer_delete) (timer_t timerid) = NULL;
+static int (*__real_timer_gettime) (timer_t timerid,
+				    struct itimerspec *curr_value) = NULL;
 #if ARCH(Intel) && WSIZE(32)
-static void *__real_pthread_create_2_1 = NULL;
-static void *__real_pthread_create_2_0 = NULL;
+static int (*__real_pthread_create_2_1) (pthread_t *thread,
+			const pthread_attr_t *attr,
+			void *(*start_routine) (void *), void *arg) = NULL;
+static int (*__real_pthread_create_2_0) (pthread_t *thread,
+			const pthread_attr_t *attr,
+			void *(*start_routine) (void *), void *arg) = NULL;
 #elif ARCH(Intel) && WSIZE(64)
-static void *__real_timer_create_2_3_3 = NULL;
-static void *__real_timer_create_2_2_5 = NULL;
-#elif ARCH(SPARC) && WSIZE(64)
-static void *__real_timer_create_2_3_3 = NULL;
-static void *__real_timer_create_2_2 = NULL;
+static int (*__real_timer_create_2_3_3) (clockid_t clockid,
+				struct sigevent *sevp, timer_t *timerid) = NULL;
+static int (*__real_timer_create_2_2_5) (clockid_t clockid,
+				struct sigevent *sevp, timer_t *timerid) = NULL;
 #endif
 
 /* Original SIGPROF handler which will be replaced with the dispatcher.  Used
@@ -93,16 +93,21 @@ static int dispatch_mode = DISPATCH_NYI;   /* controls SIGPROF dispatching */
 static int itimer_period_requested = 0;    /* dispatcher itimer period */
 static int itimer_period_actual = 0;       /* actual dispatcher itimer period */
 
-#define CALL_REAL(x) (*(int(*)())__real_##x)
-#define NULL_PTR(x) ( __real_##x == NULL )
-
-static void *__real_sigaction = NULL;
-static void *__real_setitimer = NULL;
-static void *__real_libc_setitimer = NULL;
-static void *__real_sigprocmask = NULL;
-static void *__real_thr_sigsetmask = NULL;
-static void *__real_pthread_sigmask = NULL;
-static void *__real_pthread_create = NULL;
+static int (*__real_sigaction) (int signum, const struct sigaction *act,
+                     struct sigaction *oldact) = NULL;
+static int (*__real_setitimer) (int which, const struct itimerval *new_value,
+                     struct itimerval *old_value) = NULL;
+static int (*__real_libc_setitimer) (int which,
+	const struct itimerval *new_value, struct itimerval *old_value) = NULL;
+static int (*__real_sigprocmask) (int how, const sigset_t *set,
+				  sigset_t *oldset) = NULL;
+static int (*__real_thr_sigsetmask) (int how, const sigset_t *iset,
+				     sigset_t *oset) = NULL;
+static int (*__real_pthread_sigmask) (int how, const sigset_t *set,
+				      sigset_t *oldset) = NULL;
+static int (*__real_pthread_create) (pthread_t *thread,
+			const pthread_attr_t *attr,
+			void *(*start_routine) (void *), void *arg) = NULL;
 
 /*
  * void collector_sigprof_dispatcher()
diff --git a/gprofng/libcollector/heaptrace.c b/gprofng/libcollector/heaptrace.c
index 387d2a13c00..b51ab330ba6 100644
--- a/gprofng/libcollector/heaptrace.c
+++ b/gprofng/libcollector/heaptrace.c
@@ -26,18 +26,11 @@
 #include <dlfcn.h>
 
 #include "gp-defs.h"
-#include "collector_module.h"
+#include "collector.h"
 #include "gp-experiment.h"
 #include "data_pckts.h"
 #include "tsd.h"
 
-/* TprintfT(<level>,...) definitions.  Adjust per module as needed */
-#define DBG_LT0 0 // for high-level configuration, unexpected errors/warnings
-#define DBG_LT1 1 // for configuration details, warnings
-#define DBG_LT2 2
-#define DBG_LT3 3
-#define DBG_LT4 4
-
 /* define the packets to be written out */
 typedef struct Heap_packet
 { /* Malloc/free tracing packet */
@@ -73,18 +66,8 @@ static unsigned heap_key = COLLECTOR_TSD_INVALID_KEY;
 #define CHCK_REENTRANCE(x)  ( !heap_mode || ((x) = collector_interface->getKey( heap_key )) == NULL || (*(x) != 0) )
 #define PUSH_REENTRANCE(x)  ((*(x))++)
 #define POP_REENTRANCE(x)   ((*(x))--)
-#define CALL_REAL(x)        (__real_##x)
-#define NULL_PTR(x)         (__real_##x == NULL)
 #define gethrtime collector_interface->getHiResTime
 
-#ifdef DEBUG
-#define Tprintf(...)   if (collector_interface) collector_interface->writeDebugInfo( 0, __VA_ARGS__ )
-#define TprintfT(...)  if (collector_interface) collector_interface->writeDebugInfo( 1, __VA_ARGS__ )
-#else
-#define Tprintf(...)
-#define TprintfT(...)
-#endif
-
 static void *(*__real_malloc)(size_t) = NULL;
 static void (*__real_free)(void *);
 static void *(*__real_realloc)(void *, size_t);
diff --git a/gprofng/libcollector/iotrace.c b/gprofng/libcollector/iotrace.c
index d8439b02b3a..303e755df6e 100644
--- a/gprofng/libcollector/iotrace.c
+++ b/gprofng/libcollector/iotrace.c
@@ -39,12 +39,6 @@
 #include "data_pckts.h"
 #include "tsd.h"
 
-/* TprintfT(<level>,...) definitions.  Adjust per module as needed */
-#define DBG_LT0 0 // for high-level configuration, unexpected errors/warnings
-#define DBG_LTT 0 // for interposition on GLIBC functions
-#define DBG_LT1 1 // for configuration details, warnings
-#define DBG_LT2 2
-#define DBG_LT3 3
 
 /* define the packet that will be written out */
 typedef struct IOTrace_packet
@@ -88,19 +82,8 @@ static unsigned io_key = COLLECTOR_TSD_INVALID_KEY;
 #define RECHCK_REENTRANCE(x) (!io_mode || ((x) = collector_interface->getKey( io_key )) == NULL || (*(x) == 0))
 #define PUSH_REENTRANCE(x)   ((*(x))++)
 #define POP_REENTRANCE(x)    ((*(x))--)
-
-#define CALL_REAL(x)         (__real_##x)
-#define NULL_PTR(x)          (__real_##x == NULL)
-
 #define gethrtime collector_interface->getHiResTime
 
-#ifdef DEBUG
-#define Tprintf(...)    if (collector_interface) collector_interface->writeDebugInfo( 0, __VA_ARGS__ )
-#define TprintfT(...)   if (collector_interface) collector_interface->writeDebugInfo( 1, __VA_ARGS__ )
-#else
-#define Tprintf(...)
-#define TprintfT(...)
-#endif
 
 /* interposition function handles */
 static int (*__real_open)(const char *path, int oflag, ...) = NULL;
diff --git a/gprofng/libcollector/linetrace.c b/gprofng/libcollector/linetrace.c
index 66241ac1f53..fd8e54a7973 100644
--- a/gprofng/libcollector/linetrace.c
+++ b/gprofng/libcollector/linetrace.c
@@ -30,17 +30,10 @@
 #include <sys/stat.h>
 #include <sys/mman.h>
 #include <limits.h>
-
+#include <spawn.h>
 
 #include "descendants.h"
 
-/* TprintfT(<level>,...) definitions.  Adjust per module as needed */
-#define DBG_LT0 0 // for high-level configuration, unexpected errors/warnings
-#define DBG_LTT 0 // for interposition on GLIBC functions
-#define DBG_LT1 1 // for configuration details, warnings
-#define DBG_LT2 2
-#define DBG_LT3 3
-
 #define LT_MAXNAMELEN 1024
 #define LT_MAXPATHLEN 1024
 
@@ -63,51 +56,77 @@ static int line_initted = 0;
 static collector_mutex_t fork_lineage_lock = COLLECTOR_MUTEX_INITIALIZER;
 static collector_mutex_t clone_lineage_lock = COLLECTOR_MUTEX_INITIALIZER;
 
-/* interposition */
-#define CALL_REAL(x)    (*(int(*)())__real_##x)
-#define CALL_REALC(x)   (*(char*(*)())__real_##x)
-#define CALL_REALF(x)   (*(FILE*(*)())__real_##x)
-#define NULL_PTR(x)     ( __real_##x == NULL )
-
 // For a given Linux, which lib functions have more than one GLIBC version? Do this:
 // objdump -T `find /lib /lib64 -name "*.so*"` | grep GLIBC | grep text | grep \(
-static void *__real_fork = NULL;
-static void *__real_vfork = NULL;
-static void *__real_execve = NULL;
-static void *__real_execvp = NULL;
-static void *__real_execv = NULL;
-static void *__real_execle = NULL;
-static void *__real_execlp = NULL;
-static void *__real_execl = NULL;
-static void *__real_clone = NULL;
-static void *__real_grantpt = NULL;
-static void *__real_ptsname = NULL;
-static void *__real_popen = NULL;
+static pid_t (*__real_fork) (void) = NULL;
+static pid_t (*__real_vfork) (void) = NULL;
+static int (*__real_execve) (const char *file, char *const argv[],
+			     char *const envp[]) = NULL;
+static int (*__real_execvp) (const char *file, char *const argv[]) = NULL;
+static int (*__real_execv) (const char *file, char *const argv[]) = NULL;
+static int (*__real_execle) (const char *path, const char *arg, ...) = NULL;
+static int (*__real_execlp) (const char *file, const char *arg, ...) = NULL;
+static int (*__real_execl) (const char *file, const char *arg, ...) = NULL;
+static int (*__real_clone) (int (*fn) (void *), void *child_stack,
+			   int flags, void *arg, ...) = NULL;
+static int (*__real_grantpt) (int fd) = NULL;
+static char *(*__real_ptsname) (int fd) = NULL;
+static FILE *(*__real_popen) (const char *command, const char *type) = NULL;
 static int clone_linenum = 0;
 #if ARCH(Intel)
 #if WSIZE(32)
-static void *__real_popen_2_1 = NULL;
-static void *__real_popen_2_0 = NULL;
-static void *__real_posix_spawn_2_15 = NULL;
-static void *__real_posix_spawnp_2_15 = NULL;
-static void *__real_posix_spawn_2_2 = NULL;
-static void *__real_posix_spawnp_2_2 = NULL;
+static FILE *(*__real_popen_2_1) (const char *command, const char *type) = NULL;
+static FILE *(*__real_popen_2_0) (const char *command, const char *type) = NULL;
+static int (*__real_posix_spawn_2_15) (pid_t *pid, const char *path,
+			       const posix_spawn_file_actions_t *file_actions,
+			       const posix_spawnattr_t *attrp,
+			       char *const argv[], char *const envp[]) = NULL;
+static int (*__real_posix_spawn_2_2) (pid_t *pid, const char *path,
+			      const posix_spawn_file_actions_t *file_actions,
+			      const posix_spawnattr_t *attrp,
+			      char *const argv[], char *const envp[]) = NULL;
+static int (*__real_posix_spawnp_2_15) (pid_t *pid, const char *file,
+				const posix_spawn_file_actions_t *file_actions,
+				const posix_spawnattr_t *attrp,
+				char *const argv[], char *const envp[]) = NULL;
+static int (*__real_posix_spawnp_2_2) (pid_t *pid, const char *file,
+			       const posix_spawn_file_actions_t *file_actions,
+			       const posix_spawnattr_t *attrp,
+			       char *const argv[], char *const envp[]) = NULL;
 #elif WSIZE(64)
-static void *__real_posix_spawn_2_15 = NULL;
-static void *__real_posix_spawnp_2_15 = NULL;
-static void *__real_posix_spawn_2_2_5 = NULL;
-static void *__real_posix_spawnp_2_2_5 = NULL;
+static int (*__real_posix_spawn_2_15) (pid_t *pid, const char *path,
+			       const posix_spawn_file_actions_t *file_actions,
+			       const posix_spawnattr_t *attrp,
+			       char *const argv[], char *const envp[]) = NULL;
+static int (*__real_posix_spawn_2_2_5) (pid_t *pid, const char *path,
+				const posix_spawn_file_actions_t *file_actions,
+				const posix_spawnattr_t *attrp,
+				char *const argv[], char *const envp[]) = NULL;
+static int (*__real_posix_spawnp_2_15) (pid_t *pid, const char *file,
+				const posix_spawn_file_actions_t *file_actions,
+				const posix_spawnattr_t *attrp,
+				char *const argv[], char *const envp[]) = NULL;
+static int (*__real_posix_spawnp_2_2_5) (pid_t *pid, const char *file,
+				 const posix_spawn_file_actions_t *file_actions,
+				 const posix_spawnattr_t *attrp,
+				 char *const argv[], char *const envp[]) = NULL;
 #endif /* WSIZE() */
 #endif /* ARCH(Intel) */
-static void *__real_system = NULL;
-static void *__real_posix_spawn = NULL;
-static void *__real_posix_spawnp = NULL;
-static void *__real_setuid = NULL;
-static void *__real_seteuid = NULL;
-static void *__real_setreuid = NULL;
-static void *__real_setgid = NULL;
-static void *__real_setegid = NULL;
-static void *__real_setregid = NULL;
+static int (*__real_system) (const char *command) = NULL;
+static int (*__real_posix_spawn) (pid_t *pid, const char *path,
+				const posix_spawn_file_actions_t *file_actions,
+				const posix_spawnattr_t *attrp,
+				char *const argv[], char *const envp[]) = NULL;
+static int (*__real_posix_spawnp) (pid_t *pid, const char *file,
+				const posix_spawn_file_actions_t *file_actions,
+				const posix_spawnattr_t *attrp,
+				char *const argv[], char *const envp[]) = NULL;
+static int (*__real_setuid) (uid_t uid) = NULL;
+static int (*__real_seteuid) (uid_t euid) = NULL;
+static int (*__real_setreuid) (uid_t ruid, uid_t euid) = NULL;
+static int (*__real_setgid) (gid_t gid) = NULL;
+static int (*__real_setegid) (gid_t egid) = NULL;
+static int (*__real_setregid) (gid_t rgid, gid_t egid)= NULL;
 static void linetrace_dormant ();
 static int check_follow_fork ();
 static int check_follow_exec (const char *execfile);
@@ -1604,7 +1623,7 @@ __collector_popen_2_1 (const char *cmd, const char *mode)
   if (NULL_PTR (popen))
     init_lineage_intf ();
   TprintfT (DBG_LTT, "linetrace: GLIBC: __collector_popen_2_1@%p\n", CALL_REAL (popen_2_1));
-  return __collector_popen_symver (CALL_REALF (popen_2_1), cmd, mode);
+  return __collector_popen_symver (CALL_REAL (popen_2_1), cmd, mode);
 }
 
 SYMVER_ATTRIBUTE (__collector_popen_2_0, popen@GLIBC_2.0)
@@ -1614,7 +1633,7 @@ __collector_popen_2_0 (const char *cmd, const char *mode)
   if (NULL_PTR (popen))
     init_lineage_intf ();
   TprintfT (DBG_LTT, "linetrace: GLIBC: __collector_popen_2_0@%p\n", CALL_REAL (popen_2_0));
-  return __collector_popen_symver (CALL_REALF (popen_2_0), cmd, mode);
+  return __collector_popen_symver (CALL_REAL (popen_2_0), cmd, mode);
 }
 
 SYMVER_ATTRIBUTE (__collector__popen_2_1, _popen@GLIBC_2.1)
@@ -1624,7 +1643,7 @@ __collector__popen_2_1 (const char *cmd, const char *mode)
   if (NULL_PTR (popen))
     init_lineage_intf ();
   TprintfT (DBG_LTT, "linetrace: GLIBC: __collector__popen_2_1@%p\n", CALL_REAL (popen_2_1));
-  return __collector_popen_symver (CALL_REALF (popen_2_1), cmd, mode);
+  return __collector_popen_symver (CALL_REAL (popen_2_1), cmd, mode);
 }
 
 SYMVER_ATTRIBUTE (__collector__popen_2_0, _popen@GLIBC_2.0)
@@ -1633,7 +1652,7 @@ __collector__popen_2_0 (const char *cmd, const char *mode)
 {
   if (NULL_PTR (popen))
     init_lineage_intf ();
-  return __collector_popen_symver (CALL_REALF (popen_2_0), cmd, mode);
+  return __collector_popen_symver (CALL_REAL (popen_2_0), cmd, mode);
 }
 #else // WSIZE(64)
 FILE * popen () __attribute__ ((weak, alias ("__collector_popen")));
@@ -1662,7 +1681,7 @@ __collector_popen (const char *cmd, const char *mode)
 #if ARCH(Intel) && WSIZE(32)
       return (real_popen) (cmd, mode);
 #else
-      return CALL_REALF (popen)(cmd, mode);
+      return CALL_REAL (popen)(cmd, mode);
 #endif
     }
   int following_combo = 0;
@@ -1671,7 +1690,7 @@ __collector_popen (const char *cmd, const char *mode)
 #if ARCH(Intel) && WSIZE(32)
   ret = (real_popen) (cmd, mode);
 #else
-  ret = CALL_REALF (popen)(cmd, mode);
+  ret = CALL_REAL (popen)(cmd, mode);
 #endif
   POP_REENTRANCE (guard);
   linetrace_ext_combo_epilogue ("popen", (ret == NULL) ? (-1) : 0, &following_combo);
@@ -1718,11 +1737,11 @@ __collector_ptsname (const int fildes)
   if (line_mode == LM_TRACK_LINEAGE)
     INIT_REENTRANCE (guard);
   if (guard == NULL)
-    return CALL_REALC (ptsname)(fildes);
+    return CALL_REAL (ptsname)(fildes);
   int following_combo = 0;
   linetrace_ext_combo_prologue ("ptsname", "/usr/lib/pt_chmod", &following_combo);
   PUSH_REENTRANCE (guard);
-  char *ret = CALL_REALC (ptsname)(fildes);
+  char *ret = CALL_REAL (ptsname)(fildes);
   POP_REENTRANCE (guard);
   linetrace_ext_combo_epilogue ("ptsname", (ret == NULL) ? (-1) : 1, &following_combo);
   return ret;
diff --git a/gprofng/libcollector/mmaptrace.c b/gprofng/libcollector/mmaptrace.c
index 221b4e2d176..c46dac4e0aa 100644
--- a/gprofng/libcollector/mmaptrace.c
+++ b/gprofng/libcollector/mmaptrace.c
@@ -61,13 +61,6 @@ typedef struct prmap_t
   int pr_pagesize;          /* pagesize (bytes) for this mapping */
 } prmap_t;
 
-/* TprintfT(<level>,...) definitions.  Adjust per module as needed */
-#define DBG_LT0 0 // for high-level configuration, unexpected errors/warnings
-#define DBG_LT1 1 // for configuration details, warnings
-#define DBG_LT2 2
-#define DBG_LT3 3
-#define DBG_LT4 4
-
 #define SYS_MMAP_NAME       "mmap"
 #define SYS_MMAP64_NAME     "mmap64"
 #define SYS_MUNMAP_NAME     "munmap"
@@ -113,9 +106,6 @@ static int reentrance = 0;
 #define PUSH_REENTRANCE  reentrance++
 #define POP_REENTRANCE   reentrance--
 
-#define CALL_REAL(x)    (__real_##x)
-#define NULL_PTR(x)     (__real_##x == NULL)
-
 /* interposition function handles */
 static void *(*__real_mmap)(void* start, size_t length, int prot, int flags,
 			    int fd, off_t offset) = NULL;
diff --git a/gprofng/libcollector/synctrace.c b/gprofng/libcollector/synctrace.c
index cbe4e46533d..c50151bbd52 100644
--- a/gprofng/libcollector/synctrace.c
+++ b/gprofng/libcollector/synctrace.c
@@ -38,13 +38,6 @@
 #include "tsd.h"
 #include "cc_libcollector.h"
 
-/* TprintfT(<level>,...) definitions.  Adjust per module as needed */
-#define DBG_LT0 0 // for high-level configuration, unexpected errors/warnings
-#define DBG_LTT 0 // for interposition on GLIBC functions
-#define DBG_LT1 1 // for configuration details, warnings
-#define DBG_LT2 2
-#define DBG_LT3 3
-
 /* define the packet that will be written out */
 typedef struct Sync_packet
 { /* Synchronization delay tracing packet */
@@ -88,19 +81,8 @@ static int init_thread_intf_finished = 0;
 #define RECHCK_JREENTRANCE(x)   (!sync_java || !sync_mode || ((x) = collector_interface->getKey( sync_key )) == NULL || (*(x) == 0))
 #define PUSH_REENTRANCE(x)      ((*(x))++)
 #define POP_REENTRANCE(x)       ((*(x))--)
-
-#define CALL_REAL(x)            (*(int(*)())__real_##x)
-#define NULL_PTR(x)             ( __real_##x == NULL )
 #define gethrtime	collector_interface->getHiResTime
 
-#ifdef DEBUG
-#define Tprintf(...)   if (collector_interface) collector_interface->writeDebugInfo( 0, __VA_ARGS__ )
-#define TprintfT(...)  if (collector_interface) collector_interface->writeDebugInfo( 1, __VA_ARGS__ )
-#else
-#define Tprintf(...)
-#define TprintfT(...)
-#endif
-
 /*
  * In most cases, the functions which require interposition are implemented as
  * weak symbols corresponding to an associated internal function named with a
@@ -109,26 +91,36 @@ static int init_thread_intf_finished = 0;
  * is distinct from the internal version (used by system libraries), i.e.,
  * cond_wait() is an alias for _cond_wait_cancel() rather than _cond_wait().
  */
-static void *__real_strtol = NULL;
-static void *__real_fprintf = NULL;
-static void *__real___collector_jprofile_enable_synctrace = NULL;
-static void *__real_pthread_mutex_lock = NULL;
-static void *__real_pthread_mutex_unlock = NULL; /* not interposed, used in calibrate */
-static void *__real_pthread_cond_wait = NULL;
-static void *__real_pthread_cond_timedwait = NULL;
-static void *__real_pthread_join = NULL;
-static void *__real_sem_wait = NULL;
-static void *__real_pthread_cond_wait_2_3_2 = NULL;
-static void *__real_pthread_cond_timedwait_2_3_2 = NULL;
+static long int (*__real_strtol)(const char *nptr, char **endptr, int base) = NULL;
+static int (*__real_fprintf) (FILE *stream, const char *format, ...) = NULL;
+static void (*__real___collector_jprofile_enable_synctrace) (void) = NULL;
+static int (*__real_pthread_mutex_lock) (pthread_mutex_t *mutex) = NULL;
+static int (*__real_pthread_mutex_unlock) (pthread_mutex_t *mutex) = NULL;
+static int (*__real_pthread_cond_wait) (pthread_cond_t *restrict cond,
+				pthread_mutex_t *restrict mutex) = NULL;
+static int (*__real_pthread_cond_timedwait) (pthread_cond_t *restrict cond,
+			pthread_mutex_t *restrict mutex,
+			const struct timespec *restrict abstime) = NULL;
+static int (*__real_pthread_join) (pthread_t thread, void **retval) = NULL;
+static int (*__real_sem_wait) (sem_t *sem) = NULL;
+static int (*__real_pthread_cond_wait_2_3_2) (pthread_cond_t *restrict cond,
+				pthread_mutex_t *restrict mutex) = NULL;
+static int (*__real_pthread_cond_timedwait_2_3_2) (pthread_cond_t *restrict cond,
+			pthread_mutex_t *restrict mutex,
+			const struct timespec *restrict abstime) = NULL;
 
 #if WSIZE(32)
-static void *__real_sem_wait_2_1 = NULL;
-static void *__real_sem_wait_2_0 = NULL;
-static void *__real_pthread_cond_wait_2_0 = NULL;
-static void *__real_pthread_cond_timedwait_2_0 = NULL;
+static int (*__real_sem_wait_2_1) (sem_t *sem) = NULL;
+static int (*__real_sem_wait_2_0) (sem_t *sem) = NULL;
+static int (*__real_pthread_cond_wait_2_0) (pthread_cond_t *restrict cond,
+				pthread_mutex_t *restrict mutex) = NULL;
+static int (*__real_pthread_cond_timedwait_2_0) (pthread_cond_t *restrict cond,
+			pthread_mutex_t *restrict mutex,
+			const struct timespec *restrict abstime) = NULL;
 #elif WSIZE(64)
 #if ARCH(Intel)
-static void *__real_pthread_cond_wait_2_2_5 = NULL;
+static int (*__real_pthread_cond_wait_2_2_5) (pthread_cond_t *restrict cond,
+				pthread_mutex_t *restrict mutex) = NULL;
 static void *__real_pthread_cond_timedwait_2_2_5 = NULL;
 #elif ARCH(SPARC)
 static void *__real_pthread_cond_wait_2_2 = NULL;