5 files changed, 12 insertions, 12 deletions
diff --git a/src/backend/port/dynloader/darwin.c b/src/backend/port/dynloader/darwin.c
index 18092cc759..93f19878f5 100644
--- a/src/backend/port/dynloader/darwin.c
+++ b/src/backend/port/dynloader/darwin.c
@@ -20,7 +20,7 @@
 #ifdef HAVE_DLOPEN
 
 void *
-pg_dlopen(char *filename)
+pg_dlopen(const char *filename)
 {
 	return dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
 }
@@ -32,7 +32,7 @@ pg_dlclose(void *handle)
 }
 
 PGFunction
-pg_dlsym(void *handle, char *funcname)
+pg_dlsym(void *handle, const char *funcname)
 {
 	/* Do not prepend an underscore: see dlopen(3) */
 	return dlsym(handle, funcname);
@@ -54,7 +54,7 @@ pg_dlerror(void)
 static NSObjectFileImageReturnCode cofiff_result = NSObjectFileImageFailure;
 
 void *
-pg_dlopen(char *filename)
+pg_dlopen(const char *filename)
 {
 	NSObjectFileImage image;
 
@@ -73,7 +73,7 @@ pg_dlclose(void *handle)
 }
 
 PGFunction
-pg_dlsym(void *handle, char *funcname)
+pg_dlsym(void *handle, const char *funcname)
 {
 	NSSymbol symbol;
 	char	   *symname = (char *) malloc(strlen(funcname) + 2);
diff --git a/src/backend/port/dynloader/darwin.h b/src/backend/port/dynloader/darwin.h
index 44a3bd6b82..292a31de13 100644
--- a/src/backend/port/dynloader/darwin.h
+++ b/src/backend/port/dynloader/darwin.h
@@ -2,7 +2,7 @@
 
 #include "fmgr.h"
 
-void	   *pg_dlopen(char *filename);
-PGFunction	pg_dlsym(void *handle, char *funcname);
+void	   *pg_dlopen(const char *filename);
+PGFunction	pg_dlsym(void *handle, const char *funcname);
 void		pg_dlclose(void *handle);
 char	   *pg_dlerror(void);
diff --git a/src/backend/port/dynloader/hpux.c b/src/backend/port/dynloader/hpux.c
index 5a0e40146d..5ab24f8fd9 100644
--- a/src/backend/port/dynloader/hpux.c
+++ b/src/backend/port/dynloader/hpux.c
@@ -26,7 +26,7 @@
 #include "utils/dynamic_loader.h"
 
 void *
-pg_dlopen(char *filename)
+pg_dlopen(const char *filename)
 {
 	/*
 	 * Use BIND_IMMEDIATE so that undefined symbols cause a failure return
@@ -41,7 +41,7 @@ pg_dlopen(char *filename)
 }
 
 PGFunction
-pg_dlsym(void *handle, char *funcname)
+pg_dlsym(void *handle, const char *funcname)
 {
 	PGFunction	f;
 
diff --git a/src/backend/port/dynloader/hpux.h b/src/backend/port/dynloader/hpux.h
index 0a17454f2b..6c1b367e97 100644
--- a/src/backend/port/dynloader/hpux.h
+++ b/src/backend/port/dynloader/hpux.h
@@ -19,7 +19,7 @@
 /* System includes */
 #include "fmgr.h"
 
-extern void *pg_dlopen(char *filename);
-extern PGFunction pg_dlsym(void *handle, char *funcname);
+extern void *pg_dlopen(const char *filename);
+extern PGFunction pg_dlsym(void *handle, const char *funcname);
 extern void pg_dlclose(void *handle);
 extern char *pg_dlerror(void);
diff --git a/src/backend/port/dynloader/linux.c b/src/backend/port/dynloader/linux.c
index 38e19f7484..375ade32e5 100644
--- a/src/backend/port/dynloader/linux.c
+++ b/src/backend/port/dynloader/linux.c
@@ -29,7 +29,7 @@
 #ifndef HAVE_DLOPEN
 
 void *
-pg_dlopen(char *filename)
+pg_dlopen(const char *filename)
 {
 #ifndef HAVE_DLD_H
 	elog(ERROR, "dynamic load not supported");
@@ -101,7 +101,7 @@ pg_dlopen(char *filename)
 }
 
 PGFunction
-pg_dlsym(void *handle, char *funcname)
+pg_dlsym(void *handle, const char *funcname)
 {
 #ifndef HAVE_DLD_H
 	return NULL;