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/* dll_init.h
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
struct per_module
{
void (**ctors)(void);
void (**dtors)(void);
void *data_start;
void *data_end;
void *bss_start;
void *bss_end;
int (*main)(int, char **, char **);
per_module &operator = (per_process *p)
{
ctors = p->ctors;
dtors = p->dtors;
data_start = p->data_start;
data_end = p->data_end;
bss_start = p->bss_start;
bss_end = p->bss_end;
main = p->main;
return *this;
}
void run_ctors ();
void run_dtors ();
};
typedef enum
{
DLL_NONE,
DLL_SELF, /* main-program.exe, cygwin1.dll */
DLL_LINK,
DLL_LOAD,
DLL_ANY
} dll_type;
struct dll
{
struct dll *next, *prev;
per_module p;
HMODULE handle;
int count;
bool has_dtors;
dll_type type;
long ndeps;
dll** deps;
DWORD image_size;
void* preferred_base;
PWCHAR modname;
FILE_INTERNAL_INFORMATION fii;
PWCHAR forkable_ntname;
WCHAR ntname[1]; /* must be the last data member */
void detach ();
int init ();
bool stat_real_file_once ();
void nominate_forkable (PCWCHAR);
bool create_forkable ();
void run_dtors ()
{
if (has_dtors)
{
has_dtors = 0;
p.run_dtors ();
}
}
PWCHAR forkedntname ()
{
return forkable_ntname && *forkable_ntname ? forkable_ntname : ntname;
}
};
#define MAX_DLL_BEFORE_INIT 100
class dll_list
{
bool forkables_supported ()
{
return cygwin_shared->forkable_hardlink_support >= 0;
}
DWORD forkables_dirx_size;
bool forkables_created;
PWCHAR forkables_dirx_ntname;
PWCHAR forkables_mutex_name;
HANDLE forkables_mutex;
void track_self ();
dll *find_by_forkedntname (PCWCHAR ntname);
size_t forkable_ntnamesize (dll_type, PCWCHAR fullntname, PCWCHAR modname);
void prepare_forkables_nomination ();
void update_forkables_needs ();
bool update_forkables ();
bool create_forkables ();
void denominate_forkables ();
bool close_mutex ();
void try_remove_forkables (PWCHAR dirbuf, size_t dirlen, size_t dirbufsize);
void set_forkables_inheritance (bool);
void request_forkables ();
dll *end;
dll *hold;
dll_type hold_type;
static muto protect;
/* Use this buffer under loader lock conditions only. */
static WCHAR NO_COPY nt_max_path_buffer[NT_MAX_PATH];
public:
static HANDLE ntopenfile (PCWCHAR ntname, NTSTATUS *pstatus = NULL,
ULONG openopts = 0, ACCESS_MASK access = 0,
HANDLE rootDir = NULL);
static bool read_fii (HANDLE fh, PFILE_INTERNAL_INFORMATION pfii);
static PWCHAR form_ntname (PWCHAR ntbuf, size_t bufsize, PCWCHAR name);
static PWCHAR form_shortname (PWCHAR shortbuf, size_t bufsize, PCWCHAR name);
static PWCHAR nt_max_path_buf ()
{
return nt_max_path_buffer;
}
static PCWCHAR buffered_shortname (PCWCHAR name)
{
form_shortname (nt_max_path_buffer, NT_MAX_PATH, name);
return nt_max_path_buffer;
}
dll *main_executable;
dll start;
int loaded_dlls;
int reload_on_fork;
dll *operator [] (PCWCHAR ntname);
dll *alloc (HINSTANCE, per_process *, dll_type);
dll *find (void *);
void detach (void *);
void init ();
void load_after_fork (HANDLE);
void reserve_space ();
void load_after_fork_impl (HANDLE, dll* which, int retries);
dll *find_by_modname (PCWCHAR modname);
void populate_deps (dll* d);
void topsort ();
void topsort_visit (dll* d, bool goto_tail);
void append (dll* d);
void release_forkables ();
void cleanup_forkables ();
bool setup_forkables (bool with_forkables)
{
if (!forkables_supported ())
return true; /* no need to retry fork */
if (forkables_created)
/* Once created, use forkables in current
process chain on first fork try already. */
with_forkables = true;
if (with_forkables)
request_forkables ();
return with_forkables;
}
dll *inext ()
{
while ((hold = hold->next))
if (hold_type == DLL_ANY || hold->type == hold_type)
break;
return hold;
}
dll *istart (dll_type t)
{
hold_type = t;
hold = &start;
return inext ();
}
void guard(bool lockit)
{
if (lockit)
protect.acquire ();
else
protect.release ();
}
friend void dll_global_dtors ();
dll_list () { protect.init ("dll_list"); }
};
/* References:
http://msdn.microsoft.com/en-us/windows/hardware/gg463125
http://msdn.microsoft.com/en-us/library/ms809762.aspx
*/
struct pefile
{
IMAGE_DOS_HEADER dos_hdr;
char* rva (ptrdiff_t offset) { return (char*) this + offset; }
PIMAGE_NT_HEADERS pe_hdr () { return (PIMAGE_NT_HEADERS) rva (dos_hdr.e_lfanew); }
PIMAGE_OPTIONAL_HEADER optional_hdr () { return &pe_hdr ()->OptionalHeader; }
PIMAGE_DATA_DIRECTORY idata_dir (DWORD which)
{
PIMAGE_OPTIONAL_HEADER oh = optional_hdr ();
return (which < oh->NumberOfRvaAndSizes)? oh->DataDirectory + which : 0;
}
};
extern dll_list dlls;
void dll_global_dtors ();
/* These probably belong in a newlib header but we can keep them here
for now. */
extern "C" int __cxa_atexit(void (*)(void*), void*, void*);
extern "C" int __cxa_finalize(void*);
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