diff options
Diffstat (limited to 'dlfcn')
| -rw-r--r-- | dlfcn/Makefile | 34 | ||||
| -rw-r--r-- | dlfcn/Versions | 8 | ||||
| -rw-r--r-- | dlfcn/dladdr.c | 26 | ||||
| -rw-r--r-- | dlfcn/dlclose.c | 32 | ||||
| -rw-r--r-- | dlfcn/dlerror.c | 144 | ||||
| -rw-r--r-- | dlfcn/dlfcn.h | 100 | ||||
| -rw-r--r-- | dlfcn/dlopen.c | 56 | ||||
| -rw-r--r-- | dlfcn/dlopenold.c | 61 | ||||
| -rw-r--r-- | dlfcn/dlsym.c | 51 | ||||
| -rw-r--r-- | dlfcn/dlvsym.c | 55 |
10 files changed, 567 insertions, 0 deletions
diff --git a/dlfcn/Makefile b/dlfcn/Makefile new file mode 100644 index 0000000000..ee8203cf68 --- /dev/null +++ b/dlfcn/Makefile @@ -0,0 +1,34 @@ +# Copyright (C) 1995, 1996, 1997, 1998, 1999 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 Library General Public License as +# published by the Free Software Foundation; either version 2 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 +# Library General Public License for more details. + +# You should have received a copy of the GNU Library General Public +# License along with the GNU C Library; see the file COPYING.LIB. If not, +# write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, +# Boston, MA 02111-1307, USA. + +subdir := dlfcn +headers := dlfcn.h +extra-libs := libdl +libdl-routines := dlopen dlclose dlsym dlvsym dlerror dladdr +distribute := dlopenold.c + +extra-libs-others := libdl + +include ../Makeconfig + +ifeq ($(versioning),yes) +libdl-routines += dlopenold +libdl-shared-only-routines := dlopenold +endif + +include ../Rules diff --git a/dlfcn/Versions b/dlfcn/Versions new file mode 100644 index 0000000000..b99822ad08 --- /dev/null +++ b/dlfcn/Versions @@ -0,0 +1,8 @@ +libdl { + GLIBC_2.0 { + dladdr; dlclose; dlerror; dlopen; dlsym; + } + GLIBC_2.1 { + dlopen; dlvsym; + } +} diff --git a/dlfcn/dladdr.c b/dlfcn/dladdr.c new file mode 100644 index 0000000000..2bcc25e2fd --- /dev/null +++ b/dlfcn/dladdr.c @@ -0,0 +1,26 @@ +/* Locate the shared object symbol nearest a given address. + Copyright (C) 1996, 1997, 1998, 1999 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <dlfcn.h> + +int +dladdr (const void *address, Dl_info *info) +{ + return _dl_addr (address, info); +} diff --git a/dlfcn/dlclose.c b/dlfcn/dlclose.c new file mode 100644 index 0000000000..dea2391128 --- /dev/null +++ b/dlfcn/dlclose.c @@ -0,0 +1,32 @@ +/* Close a handle opened by `dlopen'. + Copyright (C) 1995, 1996, 1997, 1998, 1999 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <dlfcn.h> + +static void +dlclose_doit (void *handle) +{ + _dl_close (handle); +} + +int +dlclose (void *handle) +{ + return _dlerror_run (dlclose_doit, handle) ? -1 : 0; +} diff --git a/dlfcn/dlerror.c b/dlfcn/dlerror.c new file mode 100644 index 0000000000..c43d511156 --- /dev/null +++ b/dlfcn/dlerror.c @@ -0,0 +1,144 @@ +/* Return error detail for failing <dlfcn.h> functions. + Copyright (C) 1995, 1996, 1997, 1998 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <dlfcn.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <bits/libc-lock.h> + +/* Type for storing results of dynamic loading actions. */ +struct dl_action_result + { + int errcode; + char *errstring; + }; +static struct dl_action_result last_result; +static struct dl_action_result *static_buf; + + +/* This is the key for the thread specific memory. */ +static __libc_key_t key; + +/* Destructor for the thread-specific data. */ +static void init (void); +static void free_key_mem (void *mem); + + +char * +dlerror (void) +{ + static char *buf; + struct dl_action_result *result; + + if (buf) + { + free (buf); + buf = NULL; + } + + /* Get error string. */ + result = (struct dl_action_result *) __libc_getspecific (key); + if (result == NULL) + result = &last_result; + + if (! result->errstring) + return NULL; + + if (result->errcode == 0) + buf = result->errstring; + else + { + if (__asprintf (&buf, "%s: %s", + result->errstring, strerror (result->errcode)) == -1) + buf = NULL; + + /* We don't need the error string anymore. */ + free (result->errstring); + } + + /* Reset the error indicator. */ + result->errstring = NULL; + + return buf; +} + +int +internal_function +_dlerror_run (void (*operate) (void *), void *args) +{ + __libc_once_define (static, once); + struct dl_action_result *result; + + /* If we have not yet initialized the buffer do it now. */ + __libc_once (once, init); + + /* Get error string and number. */ + if (static_buf != NULL) + result = static_buf; + else + { + /* We don't use the static buffer and so we have a key. Use it + to get the thread-specific buffer. */ + result = __libc_getspecific (key); + if (result == NULL) + { + result = (struct dl_action_result *) calloc (1, sizeof (*result)); + if (result == NULL) + /* We are out of memory. Since this is no really critical + situation we carry on by using the global variable. + This might lead to conflicts between the threads but + they soon all will have memory problems. */ + result = &last_result; + else + /* Set the tsd. */ + __libc_setspecific (key, result); + } + } + + if (result->errstring != NULL) + /* Free the error string from the last failed command. This can + happen if `dlerror' was not run after an error was found. */ + free (result->errstring); + + result->errcode = _dl_catch_error (&result->errstring, operate, args); + + return result->errstring != NULL; +} + + +/* Initialize buffers for results. */ +static void +init (void) +{ + if (__libc_key_create (&key, free_key_mem)) + /* Creating the key failed. This means something really went + wrong. In any case use a static buffer which is better than + nothing. */ + static_buf = &last_result; +} + + +/* Free the thread specific data, this is done if a thread terminates. */ +static void +free_key_mem (void *mem) +{ + free (mem); + __libc_setspecific (key, NULL); +} diff --git a/dlfcn/dlfcn.h b/dlfcn/dlfcn.h new file mode 100644 index 0000000000..76fdc3c1c9 --- /dev/null +++ b/dlfcn/dlfcn.h @@ -0,0 +1,100 @@ +/* User functions for run-time dynamic loading. + Copyright (C) 1995, 1996, 1997, 1998, 1999 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _DLFCN_H +#define _DLFCN_H 1 + +#include <features.h> +#define __need_NULL +#include <stddef.h> + +/* Collect various system dependent definitions and declarations. */ +#include <bits/dlfcn.h> + +/* 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 NULL + +__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 __P ((__const char *__file, int __mode)); + +/* Unmap and close a shared object opened by `dlopen'. + The handle cannot be used again after calling `dlclose'. */ +extern int dlclose __P ((void *__handle)); + +/* Find the run-time address in the shared object HANDLE refers to + of the symbol called NAME. */ +extern void *dlsym __P ((void *__restrict __handle, + __const char *__restrict __name)); + +#ifdef __USE_GNU +/* Find the run-time address in the shared object HANDLE refers to + of the symbol called NAME with VERSION. */ +extern void *dlvsym __P ((void *__restrict __handle, + __const char *__restrict __name, + __const char *__restrict __version)); +#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 __P ((void)); + +#ifdef __USE_GNU +/* Fill in *INFO with the following information about ADDRESS. + Returns 0 iff no shared object's segments contain that address. */ +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; +extern int dladdr __P ((const void *__address, Dl_info *__info)); + +/* To support profiling of shared objects it is a good idea to call + the function found using `dlsym' using the following macro since + these calls do not use the PLT. But this would mean the dynamic + loader has no chance to find out when the function is called. The + macro applies the necessary magic so that profiling is possible. + Rewrite + foo = (*fctp) (arg1, arg2); + into + foo = DL_CALL_FCT (fctp, (arg1, arg2)); +*/ +# define DL_CALL_FCT(fctp, args) \ + (_dl_mcount_wrapper_check (fctp), (*(fctp)) args) + +/* This function calls the profiling functions. */ +extern void _dl_mcount_wrapper_check __P ((void *__selfpc)); +#endif + +__END_DECLS + +#endif /* dlfcn.h */ diff --git a/dlfcn/dlopen.c b/dlfcn/dlopen.c new file mode 100644 index 0000000000..cb49e6b142 --- /dev/null +++ b/dlfcn/dlopen.c @@ -0,0 +1,56 @@ +/* Load a shared object at run time. + Copyright (C) 1995, 1996, 1997, 1998, 1999 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <dlfcn.h> + +struct dlopen_args +{ + /* The arguments for dlopen_doit. */ + const char *file; + int mode; + /* The return value of dlopen_doit. */ + void *new; + /* Address of the caller. */ + const void *caller; +}; + +static void +dlopen_doit (void *a) +{ + struct dlopen_args *args = (struct dlopen_args *) a; + + args->new = _dl_open (args->file ?: "", args->mode, args->caller); +} + + +void * +__dlopen_check (const char *file, int mode) +{ + struct dlopen_args args; + args.file = file; + args.mode = mode; + args.caller = __builtin_return_address (0); + + return _dlerror_run (dlopen_doit, &args) ? NULL : args.new; +} +#if defined PIC && defined DO_VERSIONING +default_symbol_version (__dlopen_check, dlopen, GLIBC_2.1); +#else +weak_alias (__dlopen_check, dlopen) +#endif diff --git a/dlfcn/dlopenold.c b/dlfcn/dlopenold.c new file mode 100644 index 0000000000..f453cfb881 --- /dev/null +++ b/dlfcn/dlopenold.c @@ -0,0 +1,61 @@ +/* Load a shared object at run time. + Copyright (C) 1995, 1996, 1997, 1998, 1999 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <dlfcn.h> + +/* This file is for compatibility with glibc 2.0. Compile it only if + versioning is used. */ +#if defined PIC && DO_VERSIONING + +struct dlopen_args +{ + /* The arguments for dlopen_doit. */ + const char *file; + int mode; + /* The return value of dlopen_doit. */ + void *new; + /* Address of the caller. */ + const void *caller; +}; + + +static void +dlopen_doit (void *a) +{ + struct dlopen_args *args = (struct dlopen_args *) a; + + args->new = _dl_open (args->file ?: "", args->mode, args->caller); +} + +void * +__dlopen_nocheck (const char *file, int mode) +{ + struct dlopen_args args; + args.file = file; + args.caller = __builtin_return_address (0); + + if ((mode & RTLD_BINDING_MASK) == 0) + /* By default assume RTLD_LAZY. */ + mode |= RTLD_LAZY; + args.mode = mode; + + return _dlerror_run (dlopen_doit, &args) ? NULL : args.new; +} +symbol_version (__dlopen_nocheck, dlopen, GLIBC_2.0); +#endif diff --git a/dlfcn/dlsym.c b/dlfcn/dlsym.c new file mode 100644 index 0000000000..9a8fcdfbe6 --- /dev/null +++ b/dlfcn/dlsym.c @@ -0,0 +1,51 @@ +/* Look up a symbol in a shared object loaded by `dlopen'. + Copyright (C) 1995, 1996, 1997, 1998, 1999 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <dlfcn.h> + +struct dlsym_args +{ + /* The arguments to dlsym_doit. */ + void *handle; + const char *name; + void *who; + + /* The return value of dlsym_doit. */ + void *sym; +}; + +static void +dlsym_doit (void *a) +{ + struct dlsym_args *args = (struct dlsym_args *) a; + + args->sym = _dl_sym (args->handle, args->name, args->who); +} + + +void * +dlsym (void *handle, const char *name) +{ + struct dlsym_args args; + args.who = __builtin_return_address (0); + args.handle = handle; + args.name = name; + + return (_dlerror_run (dlsym_doit, &args) ? NULL : args.sym); +} diff --git a/dlfcn/dlvsym.c b/dlfcn/dlvsym.c new file mode 100644 index 0000000000..a279b95ae9 --- /dev/null +++ b/dlfcn/dlvsym.c @@ -0,0 +1,55 @@ +/* Look up a versioned symbol in a shared object loaded by `dlopen'. + Copyright (C) 1995, 1996, 1997, 1998, 1999 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <dlfcn.h> + +struct dlvsym_args +{ + /* The arguments to dlvsym_doit. */ + void *handle; + const char *name; + const char *version; + void *who; + + /* The return values of dlvsym_doit. */ + void *sym; +}; + + +static void +dlvsym_doit (void *a) +{ + struct dlvsym_args *args = (struct dlvsym_args *)a; + + args->sym = _dl_vsym (args->handle, args->name, args->version, args->who); +} + +void * +__dlvsym (void *handle, const char *name, const char *version_str) +{ + struct dlvsym_args args; + + args.handle = handle; + args.name = name; + args.who = __builtin_return_address (0); + args.version = version_str; + + return (_dlerror_run (dlvsym_doit, &args) ? NULL : args.sym); +} +weak_alias (__dlvsym, dlvsym) |