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29 * $FreeBSD: src/include/dlfcn.h,v 1.24 2010/03/24 15:59:51 gahr Exp $
35 #include <sys/cdefs.h>
36 #include <machine/stdint.h> /* size_t */
39 * Modes and flags for dlopen().
41 #define RTLD_LAZY 1 /* Bind function calls lazily. */
42 #define RTLD_NOW 2 /* Bind function calls immediately. */
43 #define RTLD_MODEMASK 0x3
44 #define RTLD_GLOBAL 0x100 /* Make symbols globally available. */
45 #define RTLD_LOCAL 0 /* Opposite of RTLD_GLOBAL, and the default. */
46 #define RTLD_TRACE 0x200 /* Trace loaded objects and exit. */
47 #define RTLD_NODELETE 0x01000 /* Do not remove members. */
48 #define RTLD_NOLOAD 0x02000 /* Do not load if not already loaded. */
51 * Request arguments for dlinfo().
53 #define RTLD_DI_LINKMAP 2 /* Obtain link map. */
54 #define RTLD_DI_SERINFO 4 /* Obtain search path info. */
55 #define RTLD_DI_SERINFOSIZE 5 /* ... query for required space. */
56 #define RTLD_DI_ORIGIN 6 /* Obtain object origin */
57 #define RTLD_DI_MAX RTLD_DI_ORIGIN
60 * Special handle arguments for dlsym()/dlinfo().
62 #define RTLD_NEXT ((void *) -1) /* Search subsequent objects. */
63 #define RTLD_DEFAULT ((void *) -2) /* Use default search algorithm. */
64 #define RTLD_SELF ((void *) -3) /* Search the caller itself. */
65 #define RTLD_ALL ((void *) -4) /* Search everything. */
69 * Structure filled in by dladdr().
71 typedef struct dl_info {
72 const char *dli_fname; /* Pathname of shared object. */
73 void *dli_fbase; /* Base address of shared object. */
74 const char *dli_sname; /* Name of nearest symbol. */
75 void *dli_saddr; /* Address of nearest symbol. */
79 * Avoid sys/types.h namespace pollution.
83 * Structures, returned by the RTLD_DI_SERINFO dlinfo() request.
85 typedef struct dl_serpath {
86 char * dls_name; /* single search path entry */
87 unsigned int dls_flags; /* path information */
90 typedef struct dl_serinfo {
91 __size_t dls_size; /* total buffer size */
92 unsigned int dls_cnt; /* number of path entries */
93 Dl_serpath dls_serpath[1]; /* there may be more than one */
97 * The actual type declared by this typedef is immaterial, provided that
98 * it is a function pointer. Its purpose is to provide a return type for
99 * dlfunc() which can be cast to a function pointer type without depending
100 * on behavior undefined by the C standard, which might trigger a compiler
101 * diagnostic. We intentionally declare a unique type signature to force
102 * a diagnostic should the application not cast the return value of dlfunc()
105 struct __dlfunc_arg {
109 typedef void (*dlfunc_t)(struct __dlfunc_arg);
111 #endif /* __BSD_VISIBLE */
114 #if __POSIX_VISIBLE >= 200809 || __XSI_VISIBLE
117 void *dlopen(const char *, int);
118 void *dlsym(void * __restrict, const char * __restrict);
122 void *fdlopen(int, int);
123 int dladdr(const void * __restrict, Dl_info * __restrict);
124 dlfunc_t dlfunc(void * __restrict, const char * __restrict);
125 int dlinfo(void * __restrict, int, void * __restrict);
126 void *dlvsym(void * __restrict, const char * __restrict,
127 const char * __restrict);
128 #endif /* __BSD_VISIBLE */
131 #endif /* !_DLFCN_H_ */