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Implement dladdr.

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This commit is contained in:
John Polstra 1998-02-06 16:46:46 +00:00
parent 14834de441
commit 663690b388
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=33137
9 changed files with 381 additions and 24 deletions
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98
gnu/usr.bin/ld/rtld/rtld.c
View File

@ -27,7 +27,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: rtld.c,v 1.50 1997/11/29 03:32:47 jdp Exp $
* $Id: rtld.c,v 1.51 1997/12/05 02:06:37 jdp Exp $
*/
#include <sys/param.h>
@ -174,6 +174,8 @@ struct somap_private {
#define RELOC_PCREL_P(s) ((s)->r_pcrel)
#endif
#define END_SYM "_end"
static char __main_progname[] = "main";
static char *main_progname = __main_progname;
static char us[] = "/usr/libexec/ld.so";
@ -205,9 +207,10 @@ static void *__dlsym __P((void *, const char *));
static const char *__dlerror __P((void));
static void __dlexit __P((void));
static void *__dlsym3 __P((void *, const char *, void *));
static int __dladdr __P((const void *, Dl_info *));
static struct ld_entry ld_entry = {
__dlopen, __dlclose, __dlsym, __dlerror, __dlexit, __dlsym3
__dlopen, __dlclose, __dlsym, __dlerror, __dlexit, __dlsym3, __dladdr
};
void xprintf __P((char *, ...));
@ -302,11 +305,13 @@ struct _dynamic *dp;
struct so_map *main_map;
struct so_map *smp;
char *add_paths;
char *main_path;
/* Check version */
if (version != CRT_VERSION_BSD_2 &&
version != CRT_VERSION_BSD_3 &&
version != CRT_VERSION_BSD_4 &&
version != CRT_VERSION_BSD_5 &&
version != CRT_VERSION_SUN)
return -1;
@ -335,6 +340,8 @@ struct _dynamic *dp;
__progname = crtp->crt_ldso;
if (version >= CRT_VERSION_BSD_3)
main_progname = crtp->crt_prog;
main_path = version >= CRT_VERSION_BSD_5 ? crtp->crt_argv[0] :
main_progname;
/* Some buggy versions of crt0.o have crt_ldso filled in as NULL. */
if (__progname == NULL)
@ -363,7 +370,7 @@ struct _dynamic *dp;
anon_open();
/* Make a link map entry for the main program */
main_map = alloc_link_map(main_progname,
main_map = alloc_link_map(main_path,
(struct sod *) NULL, (struct so_map *) NULL,
(caddr_t) 0, crtp->crt_dp);
LM_PRIVATE(main_map)->spd_refcount++;
@ -453,7 +460,7 @@ struct _dynamic *dp;
(void)close(crtp->crt_ldfd);
anon_close();
return LDSO_VERSION_HAS_DLSYM3;
return LDSO_VERSION_HAS_DLADDR;
}
void
@ -2024,6 +2031,89 @@ resolvesym(fd, sym, retaddr)
return (void *)addr;
}
static int
__dladdr(addr, dlip)
const void *addr;
Dl_info *dlip;
{
struct _dynamic *dp;
struct so_map *smp;
char *stringbase;
long numsyms;
int symsize;
int i;
/* Find the shared object that contains the address. */
for (smp = link_map_head; smp != NULL; smp = smp->som_next) {
struct so_map *src_map;
struct somap_private *smpp;
struct nzlist *np;
smpp = LM_PRIVATE(smp);
if (smpp->spd_flags & RTLD_RTLD)
continue;
if ((void *)smp->som_addr > addr)
continue;
src_map = smp;
if ((np = lookup(END_SYM, &src_map, 1)) == NULL)
continue; /* No "_end" symbol?! */
if (addr < (void *)(smp->som_addr + np->nz_value))
break;
}
if (smp == NULL) {
generror("No shared object contains address");
return 0;
}
dlip->dli_fname = smp->som_path;
dlip->dli_fbase = smp->som_addr;
dlip->dli_saddr = (void *) 0;
dlip->dli_sname = NULL;
dp = smp->som_dynamic;
symsize = LD_VERSION_NZLIST_P(dp->d_version) ?
sizeof(struct nzlist) : sizeof(struct nlist);
numsyms = LD_STABSZ(dp) / symsize;
stringbase = LM_STRINGS(smp);
for (i = 0; i < numsyms; i++) {
struct nzlist *symp = LM_SYMBOL(smp, i);
unsigned long value;
/* Reject all except definitions. */
if (symp->nz_type != N_EXT + N_ABS &&
symp->nz_type != N_EXT + N_TEXT &&
symp->nz_type != N_EXT + N_DATA &&
symp->nz_type != N_EXT + N_BSS)
continue;
/*
* If the symbol is greater than the specified address, or
* if it is further away from addr than the current nearest
* symbol, then reject it.
*/
value = (unsigned long) (smp->som_addr + symp->nz_value);
if (value > (unsigned long) addr ||
value < (unsigned long) dlip->dli_saddr)
continue;
/* Update our idea of the nearest symbol. */
dlip->dli_sname = stringbase + symp->nz_strx;
dlip->dli_saddr = (void *) value;
if (dlip->dli_saddr == addr) /* Can't get any closer. */
break;
}
/*
* Remove any leading underscore from the symbol name, to hide
* our a.out-ness.
*/
if (dlip->dli_sname != NULL && dlip->dli_sname[0] == '_')
dlip->dli_sname++;
return 1;
}
static void *
__dlsym3(fd, sym, retaddr)
void *fd;

9
include/link.h
View File

@ -27,7 +27,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: link.h,v 1.16 1997/11/28 19:05:11 jdp Exp $
* $Id: link.h,v 1.17 1997/12/06 17:59:52 jdp Exp $
*/
/*
@ -41,6 +41,8 @@
#ifndef _LINK_H_
#define _LINK_H_
struct dl_info;
/*
* A `Shared Object Descriptor' describes a shared object that is needed
* to complete the link edit process of the object containing it.
@ -158,6 +160,7 @@ struct so_debug {
#define LDSO_VERSION_NONE 0 /* FreeBSD2.0, 2.0.5 */
#define LDSO_VERSION_HAS_DLEXIT 1 /* includes dlexit in ld_entry */
#define LDSO_VERSION_HAS_DLSYM3 2 /* includes 3-argument dlsym */
#define LDSO_VERSION_HAS_DLADDR 3 /* includes dladdr in ld_entry */
/*
* Entry points into ld.so - user interface to the run-time linker.
@ -171,6 +174,8 @@ struct ld_entry {
const char *(*dlerror) __P((void)); /* NONE */
void (*dlexit) __P((void)); /* HAS_DLEXIT */
void *(*dlsym3) __P((void *, const char *, void *)); /* HAS_DLSYM3 */
int (*dladdr) __P((const void *,
struct dl_info *)); /* HAS_DLADDR */
};
/*
@ -229,6 +234,7 @@ struct crt_ldso {
char *crt_prog; /* Program name (v3) */
char *crt_ldso; /* Link editor name (v4) */
struct ld_entry *crt_ldentry; /* dl*() access (v4) */
char **crt_argv; /* argument strings (v5) */
};
/*
@ -238,6 +244,7 @@ struct crt_ldso {
#define CRT_VERSION_BSD_2 2
#define CRT_VERSION_BSD_3 3
#define CRT_VERSION_BSD_4 4
#define CRT_VERSION_BSD_5 5
/*
* Maximum number of recognized shared object version numbers.

4
lib/csu/i386/Makefile
View File

@ -1,10 +1,10 @@
# from: @(#)Makefile 5.6 (Berkeley) 5/22/91
# $Id: Makefile,v 1.32 1997/10/11 02:37:42 asami Exp $
# $Id: Makefile,v 1.33 1998/01/12 18:29:02 eivind Exp $
CFLAGS+= -DLIBC_SCCS -fno-omit-frame-pointer -I${.CURDIR}
OBJS= crt0.o c++rt0.o gcrt0.o scrt0.o sgcrt0.o
CLEANFILES+= a.out
MAN3+= dlopen.3
MAN3+= dladdr.3 dlopen.3
MLINKS+= dlopen.3 dlsym.3 \
dlopen.3 dlerror.3 \
dlopen.3 dlclose.3

42
lib/csu/i386/crt0.c
View File

@ -27,7 +27,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: crt0.c,v 1.30 1997/08/02 04:56:33 jdp Exp $
* $Id: crt0.c,v 1.31 1997/11/22 03:34:45 brian Exp $
*/
#include <sys/param.h>
@ -85,7 +85,7 @@ static int _strncmp();
extern struct _dynamic _DYNAMIC;
static struct ld_entry *ld_entry;
static void __do_dynamic_link ();
static void __do_dynamic_link(char **argv);
#endif /* DYNAMIC */
int _callmain();
@ -174,7 +174,7 @@ start()
/* sometimes GCC is too smart/stupid for its own good */
x = (caddr_t)&_DYNAMIC;
if (x)
__do_dynamic_link();
__do_dynamic_link(argv);
#endif /* DYNAMIC */
asm("eprol:");
@ -190,7 +190,8 @@ asm ("__callmain:"); /* Defined for the benefit of debuggers */
#ifdef DYNAMIC
static void
__do_dynamic_link ()
__do_dynamic_link(argv)
char **argv;
{
struct crt_ldso crt;
struct exec hdr;
@ -253,14 +254,20 @@ __do_dynamic_link ()
crt.crt_prog = __progname;
crt.crt_ldso = ldso;
crt.crt_ldentry = NULL;
crt.crt_argv = argv;
entry = (int (*)())(crt.crt_ba + sizeof hdr);
ldso_version = (*entry)(CRT_VERSION_BSD_4, &crt);
ldso_version = (*entry)(CRT_VERSION_BSD_5, &crt);
ld_entry = crt.crt_ldentry;
if (ldso_version == -1 && ld_entry == NULL) {
/* if version 4 not recognised, try version 3 */
ldso_version = (*entry)(CRT_VERSION_BSD_3, &crt);
ld_entry = _DYNAMIC.d_entry;
/* If version 5 not recognised, try version 4 */
ldso_version = (*entry)(CRT_VERSION_BSD_4, &crt);
ld_entry = crt.crt_ldentry;
if (ldso_version == -1 && ld_entry == NULL) {
/* if version 4 not recognised, try version 3 */
ldso_version = (*entry)(CRT_VERSION_BSD_3, &crt);
ld_entry = _DYNAMIC.d_entry;
}
}
if (ldso_version == -1) {
_PUTMSG("ld.so failed");
@ -334,6 +341,16 @@ dlerror()
return (ld_entry->dlerror)();
}
int
dladdr(addr, dlip)
const void *addr;
Dl_info *dlip;
{
if (ld_entry == NULL || ldso_version < LDSO_VERSION_HAS_DLADDR)
return 0;
return (ld_entry->dladdr)(addr, dlip);
}
/*
* Support routines
@ -419,12 +436,19 @@ const char *name;
return NULL;
}
const char *
dlerror()
{
return "Service unavailable";
}
int
dladdr(addr, dlip)
const void *addr;
Dl_info *dlip;
{
return 0;
}
#endif /* DYNAMIC */

121
lib/csu/i386/dladdr.3 Normal file
View File

@ -0,0 +1,121 @@
.\"
.\" Copyright (c) 1998 John D. Polstra
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $Id$
.\"
.Dd February 5, 1998
.Os FreeBSD
.Dt DLADDR 3
.Sh NAME
.Nm dladdr
.Nd find the shared object containing a given address
.Sh SYNOPSIS
.Fd #include <dlfcn.h>
.Ft int
.Fn dladdr "const void *addr" "Dl_info *info"
.Sh DESCRIPTION
.Nm
queries the dynamic linker for information about the shared object
containing the address
.Fa addr .
The information is returned in the structure specified by
.Fa info .
The structure contains at least the following members:
.Bl -tag -width "XXXconst char *dli_fname"
.It Li "const char *dli_fname"
The pathname of the shared object containing the address.
.It Li "void *dli_fbase"
The base address at which the shared object is mapped into the
address space of the calling process.
.It Li "const char *dli_sname"
The name of the nearest run-time symbol with a value less than or
equal to
.Fa addr .
When possible, the symbol name is returned as it would appear in C
source code.
.Pp
If no symbol with a suitable value is found, both this field and
.Va dli_saddr
are set to
.Dv NULL .
.It Li "void *dli_saddr"
The value of the symbol returned in
.Li dli_sname .
.El
.Pp
.Nm
is available only in dynamically linked programs.
.Sh ERRORS
If a mapped shared object containing
.Fa addr
cannot be found,
.Nm
returns 0.
In that case, a message detailing the failure can be retrieved by
calling
.Fn dlerror .
.Pp
On success, a non-zero value is returned.
.Sh SEE ALSO
.Xr dlopen 3 ,
.Xr rtld 1
.Sh HISTORY
The
.Nm
function first appeared in the Solaris operating system.
.Sh BUGS
This implementation is bug-compatible with the Solaris
implementation. In particular, the following bugs are present:
.Bl -bullet
.It
If
.Fa addr
lies in the main executable rather than in a shared library, the
pathname returned in
.Va dli_fname
may not be correct. The pathname is taken directly from
.Va argv[0]
of the calling process. When executing a program specified by its
full pathname, most shells set
.Va argv[0]
to the pathname. But this is not required of shells or guaranteed
by the operating system.
.It
If
.Fa addr
is of the form
.Va &func ,
where
.Va func
is a global function, its value may be an unpleasant surprise. In
dynamically linked programs, the address of a global function is
considered to point to its program linkage table entry, rather than to
the entry point of the function itself. This causes most global
functions to appear to be defined within the main executable, rather
than in the shared libraries where the actual code resides.
.It
Returning 0 as an indication of failure goes against long-standing
Unix tradition.
.El

15
lib/csu/i386/dlfcn.h
View File

@ -50,11 +50,22 @@
*/
#define RTLD_NEXT ((void *) -1)
/*
* Structure filled in by dladdr().
*/
typedef struct dl_info {
const char *dli_fname; /* Pathname of shared object */
void *dli_fbase; /* Base address of shared object */
const char *dli_sname; /* Name of nearest symbol */
void *dli_saddr; /* Address of nearest symbol */
} Dl_info;
__BEGIN_DECLS
int dladdr __P((const void *, Dl_info *));
int dlclose __P((void *));
const char *dlerror __P((void));
void *dlopen __P((const char *, int));
void *dlsym __P((void *, const char *));
const char *dlerror __P((void));
int dlclose __P((void *));
__END_DECLS
#endif /* !_DLFCN_H_ */

98
libexec/rtld-aout/rtld.c
View File

@ -27,7 +27,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: rtld.c,v 1.50 1997/11/29 03:32:47 jdp Exp $
* $Id: rtld.c,v 1.51 1997/12/05 02:06:37 jdp Exp $
*/
#include <sys/param.h>
@ -174,6 +174,8 @@ struct somap_private {
#define RELOC_PCREL_P(s) ((s)->r_pcrel)
#endif
#define END_SYM "_end"
static char __main_progname[] = "main";
static char *main_progname = __main_progname;
static char us[] = "/usr/libexec/ld.so";
@ -205,9 +207,10 @@ static void *__dlsym __P((void *, const char *));
static const char *__dlerror __P((void));
static void __dlexit __P((void));
static void *__dlsym3 __P((void *, const char *, void *));
static int __dladdr __P((const void *, Dl_info *));
static struct ld_entry ld_entry = {
__dlopen, __dlclose, __dlsym, __dlerror, __dlexit, __dlsym3
__dlopen, __dlclose, __dlsym, __dlerror, __dlexit, __dlsym3, __dladdr
};
void xprintf __P((char *, ...));
@ -302,11 +305,13 @@ struct _dynamic *dp;
struct so_map *main_map;
struct so_map *smp;
char *add_paths;
char *main_path;
/* Check version */
if (version != CRT_VERSION_BSD_2 &&
version != CRT_VERSION_BSD_3 &&
version != CRT_VERSION_BSD_4 &&
version != CRT_VERSION_BSD_5 &&
version != CRT_VERSION_SUN)
return -1;
@ -335,6 +340,8 @@ struct _dynamic *dp;
__progname = crtp->crt_ldso;
if (version >= CRT_VERSION_BSD_3)
main_progname = crtp->crt_prog;
main_path = version >= CRT_VERSION_BSD_5 ? crtp->crt_argv[0] :
main_progname;
/* Some buggy versions of crt0.o have crt_ldso filled in as NULL. */
if (__progname == NULL)
@ -363,7 +370,7 @@ struct _dynamic *dp;
anon_open();
/* Make a link map entry for the main program */
main_map = alloc_link_map(main_progname,
main_map = alloc_link_map(main_path,
(struct sod *) NULL, (struct so_map *) NULL,
(caddr_t) 0, crtp->crt_dp);
LM_PRIVATE(main_map)->spd_refcount++;
@ -453,7 +460,7 @@ struct _dynamic *dp;
(void)close(crtp->crt_ldfd);
anon_close();
return LDSO_VERSION_HAS_DLSYM3;
return LDSO_VERSION_HAS_DLADDR;
}
void
@ -2024,6 +2031,89 @@ resolvesym(fd, sym, retaddr)
return (void *)addr;
}
static int
__dladdr(addr, dlip)
const void *addr;
Dl_info *dlip;
{
struct _dynamic *dp;
struct so_map *smp;
char *stringbase;
long numsyms;
int symsize;
int i;
/* Find the shared object that contains the address. */
for (smp = link_map_head; smp != NULL; smp = smp->som_next) {
struct so_map *src_map;
struct somap_private *smpp;
struct nzlist *np;
smpp = LM_PRIVATE(smp);
if (smpp->spd_flags & RTLD_RTLD)
continue;
if ((void *)smp->som_addr > addr)
continue;
src_map = smp;
if ((np = lookup(END_SYM, &src_map, 1)) == NULL)
continue; /* No "_end" symbol?! */
if (addr < (void *)(smp->som_addr + np->nz_value))
break;
}
if (smp == NULL) {
generror("No shared object contains address");
return 0;
}
dlip->dli_fname = smp->som_path;
dlip->dli_fbase = smp->som_addr;
dlip->dli_saddr = (void *) 0;
dlip->dli_sname = NULL;
dp = smp->som_dynamic;
symsize = LD_VERSION_NZLIST_P(dp->d_version) ?
sizeof(struct nzlist) : sizeof(struct nlist);
numsyms = LD_STABSZ(dp) / symsize;
stringbase = LM_STRINGS(smp);
for (i = 0; i < numsyms; i++) {
struct nzlist *symp = LM_SYMBOL(smp, i);
unsigned long value;
/* Reject all except definitions. */
if (symp->nz_type != N_EXT + N_ABS &&
symp->nz_type != N_EXT + N_TEXT &&
symp->nz_type != N_EXT + N_DATA &&
symp->nz_type != N_EXT + N_BSS)
continue;
/*
* If the symbol is greater than the specified address, or
* if it is further away from addr than the current nearest
* symbol, then reject it.
*/
value = (unsigned long) (smp->som_addr + symp->nz_value);
if (value > (unsigned long) addr ||
value < (unsigned long) dlip->dli_saddr)
continue;
/* Update our idea of the nearest symbol. */
dlip->dli_sname = stringbase + symp->nz_strx;
dlip->dli_saddr = (void *) value;
if (dlip->dli_saddr == addr) /* Can't get any closer. */
break;
}
/*
* Remove any leading underscore from the symbol name, to hide
* our a.out-ness.
*/
if (dlip->dli_sname != NULL && dlip->dli_sname[0] == '_')
dlip->dli_sname++;
return 1;
}
static void *
__dlsym3(fd, sym, retaddr)
void *fd;

9
sys/sys/link_aout.h
View File

@ -27,7 +27,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: link.h,v 1.16 1997/11/28 19:05:11 jdp Exp $
* $Id: link.h,v 1.17 1997/12/06 17:59:52 jdp Exp $
*/
/*
@ -41,6 +41,8 @@
#ifndef _LINK_H_
#define _LINK_H_
struct dl_info;
/*
* A `Shared Object Descriptor' describes a shared object that is needed
* to complete the link edit process of the object containing it.
@ -158,6 +160,7 @@ struct so_debug {
#define LDSO_VERSION_NONE 0 /* FreeBSD2.0, 2.0.5 */
#define LDSO_VERSION_HAS_DLEXIT 1 /* includes dlexit in ld_entry */
#define LDSO_VERSION_HAS_DLSYM3 2 /* includes 3-argument dlsym */
#define LDSO_VERSION_HAS_DLADDR 3 /* includes dladdr in ld_entry */
/*
* Entry points into ld.so - user interface to the run-time linker.
@ -171,6 +174,8 @@ struct ld_entry {
const char *(*dlerror) __P((void)); /* NONE */
void (*dlexit) __P((void)); /* HAS_DLEXIT */
void *(*dlsym3) __P((void *, const char *, void *)); /* HAS_DLSYM3 */
int (*dladdr) __P((const void *,
struct dl_info *)); /* HAS_DLADDR */
};
/*
@ -229,6 +234,7 @@ struct crt_ldso {
char *crt_prog; /* Program name (v3) */
char *crt_ldso; /* Link editor name (v4) */
struct ld_entry *crt_ldentry; /* dl*() access (v4) */
char **crt_argv; /* argument strings (v5) */
};
/*
@ -238,6 +244,7 @@ struct crt_ldso {
#define CRT_VERSION_BSD_2 2
#define CRT_VERSION_BSD_3 3
#define CRT_VERSION_BSD_4 4
#define CRT_VERSION_BSD_5 5
/*
* Maximum number of recognized shared object version numbers.

9
sys/sys/link_elf.h
View File

@ -27,7 +27,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: link.h,v 1.16 1997/11/28 19:05:11 jdp Exp $
* $Id: link.h,v 1.17 1997/12/06 17:59:52 jdp Exp $
*/
/*
@ -41,6 +41,8 @@
#ifndef _LINK_H_
#define _LINK_H_
struct dl_info;
/*
* A `Shared Object Descriptor' describes a shared object that is needed
* to complete the link edit process of the object containing it.
@ -158,6 +160,7 @@ struct so_debug {
#define LDSO_VERSION_NONE 0 /* FreeBSD2.0, 2.0.5 */
#define LDSO_VERSION_HAS_DLEXIT 1 /* includes dlexit in ld_entry */
#define LDSO_VERSION_HAS_DLSYM3 2 /* includes 3-argument dlsym */
#define LDSO_VERSION_HAS_DLADDR 3 /* includes dladdr in ld_entry */
/*
* Entry points into ld.so - user interface to the run-time linker.
@ -171,6 +174,8 @@ struct ld_entry {
const char *(*dlerror) __P((void)); /* NONE */
void (*dlexit) __P((void)); /* HAS_DLEXIT */
void *(*dlsym3) __P((void *, const char *, void *)); /* HAS_DLSYM3 */
int (*dladdr) __P((const void *,
struct dl_info *)); /* HAS_DLADDR */
};
/*
@ -229,6 +234,7 @@ struct crt_ldso {
char *crt_prog; /* Program name (v3) */
char *crt_ldso; /* Link editor name (v4) */
struct ld_entry *crt_ldentry; /* dl*() access (v4) */
char **crt_argv; /* argument strings (v5) */
};
/*
@ -238,6 +244,7 @@ struct crt_ldso {
#define CRT_VERSION_BSD_2 2
#define CRT_VERSION_BSD_3 3
#define CRT_VERSION_BSD_4 4
#define CRT_VERSION_BSD_5 5
/*
* Maximum number of recognized shared object version numbers.