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After relocating the main program, but before calling any of the

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_init() functions, initialize the global variables "__progname" and
"environ".  This makes it possible for the _init() functions to call
things like getenv() and err().
This commit is contained in:
John Polstra 1999-04-21 04:06:57 +00:00
parent f998a53420
commit 5353bfc3b4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=45890
1 changed files with 33 additions and 7 deletions
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40
libexec/rtld-elf/rtld.c
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@ -22,7 +22,7 @@
* (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 1.20 1999/04/09 00:28:31 jdp Exp $
* $Id: rtld.c,v 1.21 1999/04/09 06:42:00 jdp Exp $
*/
/*
@ -76,6 +76,7 @@ typedef void (*func_ptr_type)();
/*
* Function declarations.
*/
static const char *basename(const char *);
static void call_fini_functions(Obj_Entry *);
static void call_init_functions(Obj_Entry *);
static void die(void);
@ -95,16 +96,13 @@ static Obj_Entry *obj_from_addr(const void *);
static int relocate_objects(Obj_Entry *, bool);
static void rtld_exit(void);
static char *search_library_path(const char *, const char *);
static void set_program_var(const char *, const void *);
static void unref_object_dag(Obj_Entry *);
static void trace_loaded_objects(Obj_Entry *obj);
void r_debug_state(void);
void xprintf(const char *, ...);
#ifdef DEBUG
static const char *basename(const char *);
#endif
/*
* Data declarations.
*/
@ -296,6 +294,10 @@ _rtld(Elf_Addr *sp, func_ptr_type *exit_proc, Obj_Entry **objp)
if (do_copy_relocations(obj_main) == -1)
die();
dbg("initializing key program variables");
set_program_var("__progname", argv[0] != NULL ? basename(argv[0]) : "");
set_program_var("environ", env);
dbg("calling _init functions");
call_init_functions(obj_main->next);
@ -355,14 +357,12 @@ _rtld_error(const char *fmt, ...)
va_end(ap);
}
#ifdef DEBUG
static const char *
basename(const char *name)
{
const char *p = strrchr(name, '/');
return p != NULL ? p + 1 : name;
}
#endif
static void
call_fini_functions(Obj_Entry *first)
@ -1365,6 +1365,32 @@ r_debug_state(void)
{
}
/*
* Set a pointer variable in the main program to the given value. This
* is used to set key variables such as "environ" before any of the
* init functions are called.
*/
static void
set_program_var(const char *name, const void *value)
{
const Obj_Entry *obj;
unsigned long hash;
hash = elf_hash(name);
for (obj = obj_main; obj != NULL; obj = obj->next) {
const Elf_Sym *def;
if ((def = symlook_obj(name, hash, obj, false)) != NULL) {
const void **addr;
addr = (const void **)(obj->relocbase + def->st_value);
dbg("\"%s\": *%p <-- %p", name, addr, value);
*addr = value;
break;
}
}
}
/*
* Search the symbol table of a single shared object for a symbol of
* the given name. Returns a pointer to the symbol, or NULL if no