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linux.h
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1 /*-------------------------------------------------------------------------
2  *
3  * linux.h
4  * Port-specific prototypes for Linux
5  *
6  *
7  * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
8  * Portions Copyright (c) 1994, Regents of the University of California
9  *
10  * src/backend/port/dynloader/linux.h
11  *
12  *-------------------------------------------------------------------------
13  */
14 #ifndef PORT_PROTOS_H
15 #define PORT_PROTOS_H
16 
17 #include "utils/dynamic_loader.h" /* pgrminclude ignore */
18 #ifdef HAVE_DLOPEN
19 #include <dlfcn.h>
20 #endif
21 
22 
23 #ifdef HAVE_DLOPEN
24 
25 /*
26  * In some older systems, the RTLD_NOW flag isn't defined and the mode
27  * argument to dlopen must always be 1. The RTLD_GLOBAL flag is wanted
28  * if available, but it doesn't exist everywhere.
29  * If it doesn't exist, set it to 0 so it has no effect.
30  */
31 #ifndef RTLD_NOW
32 #define RTLD_NOW 1
33 #endif
34 #ifndef RTLD_GLOBAL
35 #define RTLD_GLOBAL 0
36 #endif
37 
38 #define pg_dlopen(f) dlopen((f), RTLD_NOW | RTLD_GLOBAL)
39 #define pg_dlsym dlsym
40 #define pg_dlclose dlclose
41 #define pg_dlerror dlerror
42 #endif /* HAVE_DLOPEN */
43 
44 #endif /* PORT_PROTOS_H */