| /* User functions for run-time dynamic loading. |
| Copyright (C) 1995-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _DLFCN_H |
| #define _DLFCN_H 1 |
| |
| #include <features.h> |
| #define __need_size_t |
| #include <stddef.h> |
| #include <sys/types.h> |
| |
| /* Collect various system dependent definitions and declarations. */ |
| #include <bits/dlfcn.h> |
| |
| |
| #ifdef __USE_GNU |
| /* If the first argument of `dlsym' or `dlvsym' is set to RTLD_NEXT |
| the run-time address of the symbol called NAME in the next shared |
| object is returned. The "next" relation is defined by the order |
| the shared objects were loaded. */ |
| # define RTLD_NEXT ((void *) -1l) |
| |
| /* If the first argument to `dlsym' or `dlvsym' is set to RTLD_DEFAULT |
| the run-time address of the symbol called NAME in the global scope |
| is returned. */ |
| # define RTLD_DEFAULT ((void *) 0) |
| |
| |
| /* Type for namespace indeces. */ |
| typedef long int Lmid_t; |
| |
| /* Special namespace ID values. */ |
| # define LM_ID_BASE 0 /* Initial namespace. */ |
| # define LM_ID_NEWLM -1 /* For dlmopen: request new namespace. */ |
| #endif |
| |
| |
| __BEGIN_DECLS |
| |
| /* Open the shared object FILE and map it in; return a handle that can be |
| passed to `dlsym' to get symbol values from it. */ |
| extern void *dlopen (const char *__file, int __mode) __THROWNL; |
| |
| /* Same as above, but ELF header is at OFF from the start of file. */ |
| extern void *__google_dlopen_with_offset (__const char *__file, |
| off_t offset, |
| int __mode) __THROW; |
| |
| /* Unmap and close a shared object opened by `dlopen'. |
| The handle cannot be used again after calling `dlclose'. */ |
| extern int dlclose (void *__handle) __THROWNL __nonnull ((1)); |
| |
| /* Find the run-time address in the shared object HANDLE refers to |
| of the symbol called NAME. */ |
| extern void *dlsym (void *__restrict __handle, |
| const char *__restrict __name) __THROW __nonnull ((2)); |
| |
| #ifdef __USE_GNU |
| /* Like `dlopen', but request object to be allocated in a new namespace. */ |
| extern void *dlmopen (Lmid_t __nsid, const char *__file, int __mode) __THROWNL; |
| |
| /* Same as above, but ELF header is at OFF from the start of file. */ |
| extern void *__google_dlmopen_with_offset (Lmid_t __nsid, |
| __const char *__file, |
| off_t offset, |
| int __mode) __THROW; |
| |
| /* Find the run-time address in the shared object HANDLE refers to |
| of the symbol called NAME with VERSION. */ |
| extern void *dlvsym (void *__restrict __handle, |
| const char *__restrict __name, |
| const char *__restrict __version) |
| __THROW __nonnull ((2, 3)); |
| #endif |
| |
| /* When any of the above functions fails, call this function |
| to return a string describing the error. Each call resets |
| the error string so that a following call returns null. */ |
| extern char *dlerror (void) __THROW; |
| |
| |
| #ifdef __USE_GNU |
| /* Structure containing information about object searched using |
| `dladdr'. */ |
| typedef struct |
| { |
| const char *dli_fname; /* File name of defining object. */ |
| void *dli_fbase; /* Load address of that object. */ |
| const char *dli_sname; /* Name of nearest symbol. */ |
| void *dli_saddr; /* Exact value of nearest symbol. */ |
| } Dl_info; |
| |
| /* Fill in *INFO with the following information about ADDRESS. |
| Returns 0 iff no shared object's segments contain that address. */ |
| extern int dladdr (const void *__address, Dl_info *__info) |
| __THROW __nonnull ((2)); |
| |
| /* Same as `dladdr', but additionally sets *EXTRA_INFO according to FLAGS. */ |
| extern int dladdr1 (const void *__address, Dl_info *__info, |
| void **__extra_info, int __flags) __THROW __nonnull ((2)); |
| |
| /* These are the possible values for the FLAGS argument to `dladdr1'. |
| This indicates what extra information is stored at *EXTRA_INFO. |
| It may also be zero, in which case the EXTRA_INFO argument is not used. */ |
| enum |
| { |
| /* Matching symbol table entry (const ElfNN_Sym *). */ |
| RTLD_DL_SYMENT = 1, |
| |
| /* The object containing the address (struct link_map *). */ |
| RTLD_DL_LINKMAP = 2 |
| }; |
| |
| |
| /* Get information about the shared object HANDLE refers to. |
| REQUEST is from among the values below, and determines the use of ARG. |
| |
| On success, returns zero. On failure, returns -1 and records an error |
| message to be fetched with `dlerror'. */ |
| extern int dlinfo (void *__restrict __handle, |
| int __request, void *__restrict __arg) |
| __THROW __nonnull ((1, 3)); |
| |
| /* These are the possible values for the REQUEST argument to `dlinfo'. */ |
| enum |
| { |
| /* Treat ARG as `lmid_t *'; store namespace ID for HANDLE there. */ |
| RTLD_DI_LMID = 1, |
| |
| /* Treat ARG as `struct link_map **'; |
| store the `struct link_map *' for HANDLE there. */ |
| RTLD_DI_LINKMAP = 2, |
| |
| RTLD_DI_CONFIGADDR = 3, /* Unsupported, defined by Solaris. */ |
| |
| /* Treat ARG as `Dl_serinfo *' (see below), and fill in to describe the |
| directories that will be searched for dependencies of this object. |
| RTLD_DI_SERINFOSIZE fills in just the `dls_cnt' and `dls_size' |
| entries to indicate the size of the buffer that must be passed to |
| RTLD_DI_SERINFO to fill in the full information. */ |
| RTLD_DI_SERINFO = 4, |
| RTLD_DI_SERINFOSIZE = 5, |
| |
| /* Treat ARG as `char *', and store there the directory name used to |
| expand $ORIGIN in this shared object's dependency file names. */ |
| RTLD_DI_ORIGIN = 6, |
| |
| RTLD_DI_PROFILENAME = 7, /* Unsupported, defined by Solaris. */ |
| RTLD_DI_PROFILEOUT = 8, /* Unsupported, defined by Solaris. */ |
| |
| /* Treat ARG as `size_t *', and store there the TLS module ID |
| of this object's PT_TLS segment, as used in TLS relocations; |
| store zero if this object does not define a PT_TLS segment. */ |
| RTLD_DI_TLS_MODID = 9, |
| |
| /* Treat ARG as `void **', and store there a pointer to the calling |
| thread's TLS block corresponding to this object's PT_TLS segment. |
| Store a null pointer if this object does not define a PT_TLS |
| segment, or if the calling thread has not allocated a block for it. */ |
| RTLD_DI_TLS_DATA = 10, |
| |
| RTLD_DI_MAX = 10 |
| }; |
| |
| |
| /* This is the type of elements in `Dl_serinfo', below. |
| The `dls_name' member points to space in the buffer passed to `dlinfo'. */ |
| typedef struct |
| { |
| char *dls_name; /* Name of library search path directory. */ |
| unsigned int dls_flags; /* Indicates where this directory came from. */ |
| } Dl_serpath; |
| |
| /* This is the structure that must be passed (by reference) to `dlinfo' for |
| the RTLD_DI_SERINFO and RTLD_DI_SERINFOSIZE requests. */ |
| typedef struct |
| { |
| size_t dls_size; /* Size in bytes of the whole buffer. */ |
| unsigned int dls_cnt; /* Number of elements in `dls_serpath'. */ |
| Dl_serpath dls_serpath[1]; /* Actually longer, dls_cnt elements. */ |
| } Dl_serinfo; |
| #endif /* __USE_GNU */ |
| |
| |
| __END_DECLS |
| |
| #endif /* dlfcn.h */ |