Mail Archives: djgpp/2015/10/04/11:43:54
--089e0122a3faad98dc05214942da
Content-Type: text/plain; charset=UTF-8
On 10/4/15, Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via
djgpp AT delorie DOT com] <djgpp AT delorie DOT com> wrote:
> Am 04.10.2015 12:39, schrieb Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de)
> [via djgpp AT delorie DOT com]:
>
> [snip]
>> Below is a patch that will implement ref-counting for implicitly loaded
>> modules
>> by other ones. Please not that this ref-counting only works for
>> dlopen/dlclose.
>> There may be other loading mechanisms that suffer from the same issue and
>> that
>> will not be fixed by this modification.
>> The patch is intended for the main branch but should work on v2_05_1 as
>> well.
> [snip]
>
>
> There was a typo in the previously posted patch. Please use this one.
>
> Regards,
> Juan M. Guerrero
>
The patch uses very long type and variable names: was hard to read
for me. My version is as follows. (Also attached as a patch file, because
gmail will mangle it.)
I have some concerns with the patch itself, will outline them in the
next mail.
Index: src/libc/dxe/dlopen.c
===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/dxe/dlopen.c,v
retrieving revision 1.11
diff -U 5 -p -r1.11 dlopen.c
--- src/libc/dxe/dlopen.c 4 Oct 2015 10:27:28 -0000 1.11
+++ src/libc/dxe/dlopen.c 4 Oct 2015 14:55:50 -0000
@@ -36,14 +36,16 @@
#ifndef ELOOP
#define ELOOP EMLINK
#endif
+#define DEBUG_DXE3 0 /* Prints struct __dxe_handle members. Always
commited as 0. */
+
/* private stack */
-typedef struct stk_node {
+typedef struct __stk_node {
const char *name;
- struct stk_node *next;
+ struct __stk_node *next;
} stk_node;
/* Exported symbols table entry */
typedef struct
{
@@ -57,10 +59,16 @@ typedef struct
unsigned short n_rel_relocs;
unsigned short n_abs_relocs;
char name [1]; /* expanded as needed */
} __attribute__((packed)) unres_table_entry;
+/* This is a linked list of implicitly loaded dxe modules. */
+typedef struct __llist {
+ struct __dxe_handle *handle; /* last implicitly opened module */
+ struct __llist *next;
+} dxe_list;
+
/* This is the private dxe_h structure */
typedef struct __dxe_handle
{
struct __dxe_handle *next; /* Pointer to next module in chain */
char fname[FILENAME_MAX]; /* Full module pathname */
@@ -69,10 +77,11 @@ typedef struct __dxe_handle
int n_exp_syms; /* Number of entries in export table */
exp_table_entry **exp_table; /* Exported symbols table */
char *header; /* The resident portion of header */
char *section; /* code+data+bss section */
long _fini; /* finalization */
+ dxe_list *deps; /* Linked list of implicitly open module by this
module or NULL */
} dxe_handle, *dxe_h;
/* Last-resort symbol resolver */
void *(*_dlsymresolver) (const char *symname) = NULL;
/* Last-error unresolved symbol count */
@@ -110,10 +119,12 @@ void *dlopen(const char *filename, int m
char *discardable;
stk_node *node;
static stk_node *stk_top = NULL;
+ dxe_list *deps;
+
#ifndef __GNUC__
static int cleanup = 0;
#endif
_dl_unresolved_count = 0;
@@ -205,10 +216,11 @@ found:
/* O.k, fill the module handle structure */
strcpy(dxe.fname, realfn);
dxe.inuse = 1;
dxe.mode = mode;
dxe.n_exp_syms = dxehdr.n_exp_syms;
+ dxe.deps = NULL;
/* Read DXE tables and the data section */
hdrsize = dxehdr.symbol_offset - sizeof(dxehdr);
discardsize = dxehdr.dep_size + dxehdr.unres_size + dxehdr.nrelocs
* sizeof(long);
if ((dxe.header = malloc(hdrsize + dxehdr.sec_size)) == NULL)
@@ -240,11 +252,11 @@ found:
/* Fill the unfilled portion of code+data+bss segment with zeros */
memset(dxe.section + dxehdr.sec_f_size, 0, dxehdr.sec_size -
dxehdr.sec_f_size);
/* Load the dependencies */
scan = discardable;
- for (i = 0; i < dxehdr.n_deps; i++)
+ for (deps = NULL, i = 0; i < dxehdr.n_deps; i++)
{
stk_node tmp;
tmp.name = realfn;
tmp.next = stk_top;
stk_top = &tmp;
@@ -252,14 +264,35 @@ found:
if (dlopen(scan, RTLD_GLOBAL) == NULL)
{
stk_top = tmp.next;
goto unrecoverable;
}
+ else
+ {
+ dxe_list *next;
+
+ stk_top = tmp.next;
- stk_top = tmp.next;
+ scan = strchr(scan, 0) + 1;
- scan = strchr(scan, 0) + 1;
+ /* Register all implicitly open modules by this one. */
+ if ((next = malloc(sizeof(dxe_list))) == NULL)
+ {
+ errno = ENOMEM;
+ goto midwayerror;
+ }
+ next->handle = dxe_chain;
+ next->next = NULL;
+
+ if (deps)
+ {
+ deps->next = next;
+ deps = deps->next;
+ }
+ else
+ dxe.deps = deps = next;
+ }
}
/* Allright, now we're ready to resolve all unresolved symbols */
_dl_unresolved_count = dxehdr.n_unres_syms;
_dl_unresolved_symbol[0] = 0;
@@ -325,10 +358,50 @@ found:
errno = ENOMEM;
goto midwayerror;
}
memcpy(dxe_chain, &dxe, sizeof(dxe_handle));
+#if (DEBUG_DXE3 -0) == 1
+ {
+ FILE *f = fopen("c:/tmp/dxe_chain.txt", "a");
+
+ if (f)
+ {
+ fprintf(f, "dxe_chain : 0x%p\n"
+ " next : 0x%p\n"
+ " fname : %s\n"
+ " mode : %s\n"
+ " inuse : %d\n"
+ " n_exp_syms : %d\n"
+ " exp_table : 0x%p\n",
+ dxe_chain, dxe_chain->next, dxe_chain->fname,
+ dxe_chain->mode == RTLD_LAZY ? "RTLD_LAZY" :
+ dxe_chain->mode == RTLD_NOW ? "RTLD_NOW" :
+ dxe_chain->mode == RTLD_LOCAL ? "RTLD_LOCAL" :
+ dxe_chain->mode == RTLD_GLOBAL ? "RTLD_GLOBAL" : "unknown",
+ dxe_chain->inuse, dxe_chain->n_exp_syms,
dxe_chain->exp_table);
+ for (i = 0; i < dxe_chain->n_exp_syms; i++)
+ fprintf(f, " exp_table[%d]->offset : %ld\n"
+ " exp_table[%d]->name : %s\n",
+ i, dxe_chain->exp_table[i]->offset, i,
dxe_chain->exp_table[i]->name);
+ fprintf(f, " header : 0x%p\n"
+ " section : 0x%p\n"
+ " _fini : %ld\n",
+ dxe_chain->header, dxe_chain->section, dxe_chain->_fini);
+ if ((deps = dxe_chain->deps))
+ for (; deps; deps = deps->next)
+ fprintf(f, " deps : 0x%p\n"
+ " handle : 0x%p\n"
+ " handle->fname : %s\n\n",
+ deps, deps->handle, deps->handle->fname);
+ else
+ fprintf(f, " deps : 0x00000000\n\n");
+ fclose(f);
+ }
+ }
+#endif
+
#ifndef __GNUC__
if (!cleanup)
{
cleanup = !0;
atexit(_closeall);
@@ -361,10 +434,21 @@ int dlclose(void *dxe)
{
dxe_h *cur;
for (cur = &dxe_chain; *cur; cur = &(*cur)->next)
if (*cur == dxe)
{
+ /* Un-register all implicitly loaded modules by this module. */
+ dxe_list *deps = (*cur)->deps;
+ while (deps)
+ {
+ dxe_list *next = deps->next;
+
+ dlclose(deps->handle);
+ free(deps);
+ deps = next;
+ }
+
*cur = ((dxe_h)dxe)->next;
break;
}
}
--
O.S.
--089e0122a3faad98dc05214942da
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