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001: /* User functions for run-time dynamic loading. 002: Copyright (C) 1995-2001,2003,2004,2006,2009 Free Software Foundation, Inc. 003: This file is part of the GNU C Library. 004: 005: The GNU C Library is free software; you can redistribute it and/or 006: modify it under the terms of the GNU Lesser General Public 007: License as published by the Free Software Foundation; either 008: version 2.1 of the License, or (at your option) any later version. 009: 010: The GNU C Library is distributed in the hope that it will be useful, 011: but WITHOUT ANY WARRANTY; without even the implied warranty of 012: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 013: Lesser General Public License for more details. 014: 015: You should have received a copy of the GNU Lesser General Public 016: License along with the GNU C Library; if not, write to the Free 017: Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 018: 02111-1307 USA. */ 019: 020: #ifndef _DLFCN_H 021: #define _DLFCN_H 1 022: 023: #include <features.h> 024: #define __need_size_t 025: #include <stddef.h> 026: 027: /* Collect various system dependent definitions and declarations. */ 028: #include <bits/dlfcn.h> 029: 030: 031: #ifdef __USE_GNU 032: /* If the first argument of `dlsym' or `dlvsym' is set to RTLD_NEXT 033: the run-time address of the symbol called NAME in the next shared 034: object is returned. The "next" relation is defined by the order 035: the shared objects were loaded. */ 036: # define RTLD_NEXT ((void *) -1l) 037: 038: /* If the first argument to `dlsym' or `dlvsym' is set to RTLD_DEFAULT 039: the run-time address of the symbol called NAME in the global scope 040: is returned. */ 041: # define RTLD_DEFAULT ((void *) 0) 042: 043: 044: /* Type for namespace indeces. */ 045: typedef long int Lmid_t; 046: 047: /* Special namespace ID values. */ 048: # define LM_ID_BASE 0 /* Initial namespace. */ 049: # define LM_ID_NEWLM -1 /* For dlmopen: request new namespace. */ 050: #endif 051: 052: 053: __BEGIN_DECLS 054: 055: /* Open the shared object FILE and map it in; return a handle that can be 056: passed to `dlsym' to get symbol values from it. */ 057: extern void *dlopen (__const char *__file, int __mode) __THROW; 058: 059: /* Unmap and close a shared object opened by `dlopen'. 060: The handle cannot be used again after calling `dlclose'. */ 061: extern int dlclose (void *__handle) __THROW __nonnull ((1)); 062: 063: /* Find the run-time address in the shared object HANDLE refers to 064: of the symbol called NAME. */ 065: extern void *dlsym (void *__restrict __handle, 066: __const char *__restrict __name) __THROW __nonnull ((2)); 067: 068: #ifdef __USE_GNU 069: /* Like `dlopen', but request object to be allocated in a new namespace. */ 070: extern void *dlmopen (Lmid_t __nsid, __const char *__file, int __mode) __THROW; 071: 072: /* Find the run-time address in the shared object HANDLE refers to 073: of the symbol called NAME with VERSION. */ 074: extern void *dlvsym (void *__restrict __handle, 075: __const char *__restrict __name, 076: __const char *__restrict __version) 077: __THROW __nonnull ((2, 3)); 078: #endif 079: 080: /* When any of the above functions fails, call this function 081: to return a string describing the error. Each call resets 082: the error string so that a following call returns null. */ 083: extern char *dlerror (void) __THROW; 084: 085: 086: #ifdef __USE_GNU 087: /* Structure containing information about object searched using 088: `dladdr'. */ 089: typedef struct 090: { 091: __const char *dli_fname; /* File name of defining object. */ 092: void *dli_fbase; /* Load address of that object. */ 093: __const char *dli_sname; /* Name of nearest symbol. */ 094: void *dli_saddr; /* Exact value of nearest symbol. */ 095: } Dl_info; 096: 097: /* Fill in *INFO with the following information about ADDRESS. 098: Returns 0 iff no shared object's segments contain that address. */ 099: extern int dladdr (__const void *__address, Dl_info *__info) 100: __THROW __nonnull ((2)); 101: 102: /* Same as `dladdr', but additionally sets *EXTRA_INFO according to FLAGS. */ 103: extern int dladdr1 (__const void *__address, Dl_info *__info, 104: void **__extra_info, int __flags) __THROW __nonnull ((2)); 105: 106: /* These are the possible values for the FLAGS argument to `dladdr1'. 107: This indicates what extra information is stored at *EXTRA_INFO. 108: It may also be zero, in which case the EXTRA_INFO argument is not used. */ 109: enum 110: { 111: /* Matching symbol table entry (const ElfNN_Sym *). */ 112: RTLD_DL_SYMENT = 1, 113: 114: /* The object containing the address (struct link_map *). */ 115: RTLD_DL_LINKMAP = 2 116: }; 117: 118: 119: /* Get information about the shared object HANDLE refers to. 120: REQUEST is from among the values below, and determines the use of ARG. 121: 122: On success, returns zero. On failure, returns -1 and records an error 123: message to be fetched with `dlerror'. */ 124: extern int dlinfo (void *__restrict __handle, 125: int __request, void *__restrict __arg) 126: __THROW __nonnull ((1, 3)); 127: 128: /* These are the possible values for the REQUEST argument to `dlinfo'. */ 129: enum 130: { 131: /* Treat ARG as `lmid_t *'; store namespace ID for HANDLE there. */ 132: RTLD_DI_LMID = 1, 133: 134: /* Treat ARG as `struct link_map **'; 135: store the `struct link_map *' for HANDLE there. */ 136: RTLD_DI_LINKMAP = 2, 137: 138: RTLD_DI_CONFIGADDR = 3, /* Unsupported, defined by Solaris. */ 139: 140: /* Treat ARG as `Dl_serinfo *' (see below), and fill in to describe the 141: directories that will be searched for dependencies of this object. 142: RTLD_DI_SERINFOSIZE fills in just the `dls_cnt' and `dls_size' 143: entries to indicate the size of the buffer that must be passed to 144: RTLD_DI_SERINFO to fill in the full information. */ 145: RTLD_DI_SERINFO = 4, 146: RTLD_DI_SERINFOSIZE = 5, 147: 148: /* Treat ARG as `char *', and store there the directory name used to 149: expand $ORIGIN in this shared object's dependency file names. */ 150: RTLD_DI_ORIGIN = 6, 151: 152: RTLD_DI_PROFILENAME = 7, /* Unsupported, defined by Solaris. */ 153: RTLD_DI_PROFILEOUT = 8, /* Unsupported, defined by Solaris. */ 154: 155: /* Treat ARG as `size_t *', and store there the TLS module ID 156: of this object's PT_TLS segment, as used in TLS relocations; 157: store zero if this object does not define a PT_TLS segment. */ 158: RTLD_DI_TLS_MODID = 9, 159: 160: /* Treat ARG as `void **', and store there a pointer to the calling 161: thread's TLS block corresponding to this object's PT_TLS segment. 162: Store a null pointer if this object does not define a PT_TLS 163: segment, or if the calling thread has not allocated a block for it. */ 164: RTLD_DI_TLS_DATA = 10, 165: 166: RTLD_DI_MAX = 10 167: }; 168: 169: 170: /* This is the type of elements in `Dl_serinfo', below. 171: The `dls_name' member points to space in the buffer passed to `dlinfo'. */ 172: typedef struct 173: { 174: char *dls_name; /* Name of library search path directory. */ 175: unsigned int dls_flags; /* Indicates where this directory came from. */ 176: } Dl_serpath; 177: 178: /* This is the structure that must be passed (by reference) to `dlinfo' for 179: the RTLD_DI_SERINFO and RTLD_DI_SERINFOSIZE requests. */ 180: typedef struct 181: { 182: size_t dls_size; /* Size in bytes of the whole buffer. */ 183: unsigned int dls_cnt; /* Number of elements in `dls_serpath'. */ 184: Dl_serpath dls_serpath[1]; /* Actually longer, dls_cnt elements. */ 185: } Dl_serinfo; 186: #endif /* __USE_GNU */ 187: 188: 189: __END_DECLS 190: 191: #endif /* dlfcn.h */ 192: