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openbsd.h

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00001 /*-------------------------------------------------------------------------
00002  *
00003  * openbsd.h
00004  *    port-specific prototypes for OpenBSD
00005  *
00006  * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
00007  * Portions Copyright (c) 1994, Regents of the University of California
00008  *
00009  * src/backend/port/dynloader/openbsd.h
00010  *
00011  *-------------------------------------------------------------------------
00012  */
00013 #ifndef PORT_PROTOS_H
00014 #define PORT_PROTOS_H
00015 
00016 #include <sys/types.h>
00017 #include <nlist.h>
00018 #include <link.h>
00019 #include <dlfcn.h>
00020 
00021 #include "utils/dynamic_loader.h"       /* pgrminclude ignore */
00022 
00023 /*
00024  * Dynamic Loader on NetBSD 1.0.
00025  *
00026  * this dynamic loader uses the system dynamic loading interface for shared
00027  * libraries (ie. dlopen/dlsym/dlclose). The user must specify a shared
00028  * library as the file to be dynamically loaded.
00029  *
00030  * agc - I know this is all a bit crufty, but it does work, is fairly
00031  * portable, and works (the stipulation that the d.l. function must
00032  * begin with an underscore is fairly tricky, and some versions of
00033  * NetBSD (like 1.0, and 1.0A pre June 1995) have no dlerror.)
00034  */
00035 
00036 /*
00037  * In some older systems, the RTLD_NOW flag isn't defined and the mode
00038  * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
00039  * if available, but it doesn't exist everywhere.
00040  * If it doesn't exist, set it to 0 so it has no effect.
00041  */
00042 #ifndef RTLD_NOW
00043 #define RTLD_NOW 1
00044 #endif
00045 #ifndef RTLD_GLOBAL
00046 #define RTLD_GLOBAL 0
00047 #endif
00048 
00049 #define        pg_dlopen(f)    BSD44_derived_dlopen((f), RTLD_NOW | RTLD_GLOBAL)
00050 #define        pg_dlsym        BSD44_derived_dlsym
00051 #define        pg_dlclose      BSD44_derived_dlclose
00052 #define        pg_dlerror      BSD44_derived_dlerror
00053 
00054 char       *BSD44_derived_dlerror(void);
00055 void       *BSD44_derived_dlopen(const char *filename, int num);
00056 void       *BSD44_derived_dlsym(void *handle, const char *name);
00057 void        BSD44_derived_dlclose(void *handle);
00058 
00059 #endif   /* PORT_PROTOS_H */