newlib-cygwin/winsup/cygwin/dll_init.cc

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/* dll_init.cc
Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
2007, 2008, 2009 Red Hat, Inc.
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This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include "cygerrno.h"
#include "perprocess.h"
#include "dll_init.h"
#include "environ.h"
#include "security.h"
Add "path.h" include throughout, where needed. Use new path_conv methods and operators to simplify testing for directory and attributes, throughout. * path.h (path_conv::exists): New method. (path_conv::has_attribute): Ditto. (path_conv::isdir): Ditto. (path_conv::DWORD &): New operator. (path_conv::int &): Ditto. * dir.cc (rmdir): Eliminate a goto. * dtable.cc (dtable::build_fhandler): Accept opt and suffix info for path_conv.check. Return fh == NULL on path_conv error. Pass unit to set_name as appropriate. (dtable::reset_unix_path_name): New method. * dtable.h (dtable): Declare new method. Reflect arg changes to build_fhandler. * fhandler.cc (fhandler_disk_dummy_name): Eliminate. (fhandler_base::set_name): Expect paths to be NULL. Build unix_path_name from win32_path_name when it is a device. (fhandler_base::reset_unix_path_name): New method. (fhandler_base::raw_read): Report EISDIR when ERROR_INVALID_FUNCTION or ERROR_INVALID_PARAMETER and reading a directory. (fhandler_disk_file::fstat): Don't call stat_dev since we should now never be calling fhandler_disk_file methods with devices. (fhandler_base::fhandler_base): Clear {unix,win32}_path_name. (fhandler_base::~fhandler_base): Always free {unix,win32}_path_name. (fhandler_disk_file::fhandler_disk_file): Remove set_no_free_names kludge. (fhandler_disk_file::open): Ditto. * fhandler.h (fhandler_base::no_free_names): Eliminate. (fhandler_base::set_no_free_names): Ditto. * fhandler_tty.cc (fhandler_tty_slave::fhandler_tty_slave): Don't set unix_path_name here. * path.cc (fchdir): Lock fd table throughout. Use new dtable::reset_unix_path_name method to reset path. * syscalls.cc (stat_worker): Reorganize to always call fstat method. Pass path_conv method to fhandler_*::open. (chroot): Elminate a goto.
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#include "path.h"
* devices.cc: New file. * devices.gperf: New file. * devices.shilka: New file. * cygwin-gperf: New file. * cygwin-shilka: New file. * fhandler_fifo.cc: New file. * fhandler_nodevice.cc : New file. Reorganize headers so that path.h precedes fhandler.h throughout. Remove device argument and unit arguments from fhandler constructors throughout. Remove pc arguments to fhandler functions and use internal pc element instead, throughout. Use dev element in pc throughout. Use major/minor elements rather than units and device numbers previously in fhandler class. Use correct methods for fhandler file names rather than directly accessing file name variables, throughout. * Makefile.in (DLL_OFILES): Add devices.o, fhandler_fifo.o * dcrt0.cc (dll_crt0_1): Call device::init. * devices.h: Renumber devices based on more Linux-like major/minor numbers. Add more devices. Declare standard device storage. (device): Declare struct. * dir.cc (opendir): Use new 'build_fh_name' to construct a fhandler_* type. * dtable.cc (dtable::get_debugger_info): Ditto. (cygwin_attach_handle_to_fd): Ditto. (dtable::release): Remove special FH_SOCKET case in favor of generic "need_fixup_before" test. (dtable::init_std_file_from_handle): Use either build_fh_dev or build_fh_name to build standard fhandler. (dtable::build_fh_name): Renamed from dtable::build_fhandler_from_name. Move out of dtable class. Don't accept a path_conv argument. Just build it here and pass it to: (build_fh_pc): Renamed from dtable::build_fhandler. Move out of dtable class. Use intrinsic device type in path_conv to create new fhandler. (build_fh_dev): Renamed from dtable::build_fhandler. Move out of dtable class. Simplify arguments to just take new 'device' type and a name. Just return pointer to fhandler rather than trying to insert into dtable. (dtable::dup_worker): Accommodate above build_fh name changes. (dtable::find_fifo): New (currently broken) function. (handle_to_fn): Use strechr for efficiency. * dtable.h: Reflect above build_fh name changes and argument differences. (fhandler_base *&operator []): Return self rather than copy of self. * fhandler.cc (fhandler_base::operator =): Use pc element to set normalized path. (fhandler_base::set_name): Ditto. (fhandler_base::raw_read): Use method to access name. (fhandler_base::write): Correctly use get_output_handle rather than get_handle. (handler_base::device_access_denied): New function. (fhandler_base::open): Eliminate pc argument and use pc element of fhandler_base throughout. (fhandler_base::fstat): Detect if device is based in filesystem and use fstat_fs to calculate stat, if so. (fhandler_base::fhandler_base): Eliminate handling of file names and, instead, just free appropriate component from pc. (fhandler_base::opendir): Remove path_conv parameter. * fhandler.h: Remove all device flags. (fhandler_base::pc): New element. (fhandler_base::set_name): Change argument to path_conv. (fhandler_base::error): New function. (fhandler_base::exists): New function. (fhandler_base::pc_binmode): New function. (fhandler_base::dev): New function. (fhandler_base::open_fs): New function. (fhandler_base::fstat_fs): New function. (fhandler_base::fstat_by_name): New function. (fhandler_base::fstat_by_handle): New function. (fhandler_base::isfifo): New function. (fhandler_base::is_slow): New function. (fhandler_base::is_auto_device): New function. (fhandler_base::is_fs_special): New function. (fhandler_base::device_access_denied): New function. (fhandler_base::operator DWORD&): New operator. (fhandler_base::get_name): Return normalized path from pc. (fhandler_base::get_win32_name): Return windows path from pc. (fhandler_base::isdevice): Renamed from is_device. (fhandler_base::get_native_name): Return device format. (fhandler_fifo): New class. (fhandler_nodevice): New class. (select_stuff::device_specific): Remove array. (select_stuff::device_specific_pipe): New class element. (select_stuff::device_specific_socket): New class element. (select_stuff::device_specific_serial): New class element. (select_stuff::select_stuff): Initialize new elements. * fhandler_disk_file.cc (fhandler_base::fstat_by_handle): Move to base class from fhandler_disk_file. (fhandler_base::fstat_by_name): Ditto. (fhandler_base::fstat_by_name): Ditto. (fhandler_disk_file::open): Move most functionality into fhandler_base::open_fs. (fhandler_base::open_fs): New function. (fhandler_disk_file::close): Move most functionality into fhandler_base::close_fs. (fhandler_base::close_fs): New function. * fhandler_mem.cc (fhandler_dev_mem::open): Use device name in debugging output. * fhandler_socket.cc (fhandler_socket::set_connect_secret): Copy standard urandom device into appropriate place. (fhandler_socket::accept): Reflect change in fdsock return value. * fhandler_tty.cc: See "throughouts" above. * net.cc: Accommodate fdsock change throughout. (fdsock): Return success or failure, accept fd argument and device argument. * path.cc (symlink_info::major): New element. (symlink_info::minor): New element. (symlink_info::parse_device): Declare new function. (fs_info::update): Accommodate changes in path_conv class. (path_conv::fillin): Ditto. (path_conv::return_and_clear_normalized_path): Eliminate. (path_conv::set_normalized_path): New function. (path_conv::path_conv): Set info in dev element. Use path_conv methods Check for FH_FS rather than FH_BAD to indicate when to fill in filesystem stuff. where appropriate rather than direct access. Use set_normalized_path to set normalized path. (windows_device_names): Eliminate. (get_dev): Ditto. (get_raw_device_number): Ditto. (get_device_number): Ditto. (win32_device_name): Call new device name parser to do most of the heavy lifting. (mount_info::conv_to_win32_path): Fill in dev field as appropriate. (symlink_worker): Handle new device files. (symlink_info::check): Ditto. (symlink_info::parse_device): Define new function. * path.h (executable_states): Move here from fhandler.h. (fs_info): Rename variables to *_storage and create methods for accessing same. (path_conv): Add dev element, remove devn and unit and adjust inline methods to accommodate. (set_normalized_path): Declare new function. * pinfo.cc (_pinfo::commune_recv): Add broken support for handling fifos. (_pinfo::commune_send): Ditto. * pipe.cc (fhandler_pipe::close): check for existence of handle before closing it. (handler_pipe::create): Rename from make_pipe. Change arguments to accept fhandler_pipe array. Accommodate fifos. (pipe): Rework to deal with fhandler_pipe::create changes. (_pipe): Ditto. * select.cc: Use individual device_specific types throughout rather than indexing with obsolete device number. (set_bits): Use is_socket call rather than checking device number. * shared_info.h (CURR_MOUNT_MAGIC): Update. (conv_to_win32_path): Reflect addition of device argument. * syscalls.cc (mknod_worker): New function. (open): Use build_fh_name to build fhandler. (chown_worker): Detect if this is an 'auto' device rather than an on-filesystem device and handle appropriately. (chmod_device): New function. (chmod): Detect if this is an 'auto' device rather than an on-filesystem device and handle appropriately. Use chmod_device to set mode of in-filesystem devices. (stat_worker): Eliminate path_conv argument. Call build_fh_name to construct fhandler. Use fh->error() rather than pc->error to detect errors in fhandler construction. (access_worker): New function pulled from access. Accommodate in-filesystem devices. (access): Use access_worker. (fpathconf): Detect if this is an 'auto' device rather than an on-filesystem device and handle appropriately. (mknod_worker): New function. (mknod32): New function. (chroot): Free normalized path -- assuming it was actually cmalloced. * tty.cc (create_tty_master): Tweak for new device class. (tty::common_init): Ditto. * winsup.h (stat_worker): Remove. (symlink_worker): Declare. * exceptions.cc (set_process_mask): Just call sig_dispatch_pending and don't worry about pending_signals since sig_dispatch_pending should always do the right thing now. (sig_handle): Reorganize SIGCONT handling to more closely conform to SUSv3. * pinfo.h: Move __SIG enum to sigproc.h. (PICOM_FIFO): New enum element. (_pinfo): Remove 'thread2signal' stuff throughout class. (_pinfo::commune_send): Make varargs. (_pinfo::sigtodo): Eliminate. (_pinfo::thread2signal): Ditto. * signal.cc (kill_worker): Eliminate call to setthread2signal. * sigproc.cc (local_sigtodo): Eliminate. (getlocal_sigtodo): Ditto. (sigelem): New class. (pending_signals): New class. (sigqueue): New variable, start of sigqueue linked list. (sigcatch_nonmain): Eliminate. (sigcatch_main): Eliminate. (sigcatch_nosync): Eliminate. (sigcomplete_nonmain): Eliminate. (pending_signals): Eliminate. (sig_clear): Call signal thread to clear pending signals, unless already in signal thread. (sigpending): Call signal thread to get pending signals. (sig_dispatch_pending): Eliminate use of pending_signals and just check sigqueue. (sigproc_terminate): Eliminate all of the obsolete semaphore stuff. Close signal pipe handle. (sig_send): Eliminate all of the obsolete semaphore stuff and use pipe to send signals. (getevent): Eliminate. (pending_signals::add): New function. (pending_signals::del): New function. (pending_signals::next): New function. (wait_sig): Eliminate all of the obsolete semaphore stuff. Use pipe to communicate and maintain a linked list of signals. * sigproc.h: Move __SIG defines here. Add __SIGPENDING. (sig_dispatch_pending): Remove "C" specifier. (sig_handle): Accept a mask argument. * thread.cc: Remove signal handling considerations throughout.
2003-09-25 08:37:18 +08:00
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "pinfo.h"
#include "cygtls.h"
#include <wchar.h>
#include <sys/reent.h>
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extern void __stdcall check_sanity_and_sync (per_process *);
dll_list dlls;
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static bool dll_global_dtors_recorded;
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/* Run destructors for all DLLs on exit. */
void
dll_global_dtors ()
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{
int recorded = dll_global_dtors_recorded;
dll_global_dtors_recorded = false;
if (recorded && dlls.start.next)
for (dll *d = dlls.end; d != &dlls.start; d = d->prev)
d->run_dtors ();
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}
/* Run all constructors associated with a dll */
void
per_module::run_ctors ()
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{
void (**pfunc)() = ctors;
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/* Run ctors backwards, so skip the first entry and find how many
there are, then run them. */
if (pfunc)
{
int i;
for (i = 1; pfunc[i]; i++);
for (int j = i - 1; j > 0; j--)
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(pfunc[j]) ();
}
}
/* Run all destructors associated with a dll */
void
per_module::run_dtors ()
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{
void (**pfunc)() = dtors;
while (*++pfunc)
(*pfunc) ();
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}
/* Initialize an individual DLL */
int
dll::init ()
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{
int ret = 1;
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/* Why didn't we just import this variable? */
*(p.envptr) = __cygwin_environ;
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/* Don't run constructors or the "main" if we've forked. */
if (!in_forkee)
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{
/* global contructors */
p.run_ctors ();
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/* entry point of dll (use main of per_process with null args...) */
if (p.main)
ret = (*(p.main)) (0, 0, 0);
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}
return ret;
}
/* Look for a dll based on name */
dll *
dll_list::operator[] (const PWCHAR name)
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{
dll *d = &start;
while ((d = d->next) != NULL)
if (!wcscasecmp (name, d->name))
return d;
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return NULL;
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}
#define RETRIES 1000
/* Allocate space for a dll struct. */
dll *
dll_list::alloc (HINSTANCE h, per_process *p, dll_type type)
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{
WCHAR name[NT_MAX_PATH];
DWORD namelen = GetModuleFileNameW (h, name, sizeof (name));
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/* Already loaded? */
dll *d = dlls[name];
if (d)
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{
if (!in_forkee)
d->count++; /* Yes. Bump the usage count. */
return d; /* Return previously allocated pointer. */
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}
/* FIXME: Change this to new at some point. */
d = (dll *) cmalloc (HEAP_2_DLL, sizeof (*d) + (namelen * sizeof (*name)));
/* Now we've allocated a block of information. Fill it in with the supplied
info about this DLL. */
d->count = 1;
wcscpy (d->name, name);
d->handle = h;
d->has_dtors = true;
d->p = p;
d->type = type;
if (end == NULL)
end = &start; /* Point to "end" of dll chain. */
end->next = d; /* Standard linked list stuff. */
d->next = NULL;
d->prev = end;
end = d;
tot++;
if (type == DLL_LOAD)
loaded_dlls++;
return d;
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}
dll *
dll_list::find (void *retaddr)
{
MEMORY_BASIC_INFORMATION m;
if (!VirtualQuery (retaddr, &m, sizeof m))
return NULL;
HMODULE h = (HMODULE) m.AllocationBase;
dll *d = &start;
while ((d = d->next))
if (d->handle == h)
break;
return d;
}
/* Detach a DLL from the chain. */
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void
dll_list::detach (void *retaddr)
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{
dll *d;
if (!myself || exit_state || !(d = find (retaddr)))
return;
if (d->count <= 0)
system_printf ("WARNING: trying to detach an already detached dll ...");
if (--d->count == 0)
{
__cxa_finalize (d);
d->run_dtors ();
d->prev->next = d->next;
if (d->next)
d->next->prev = d->prev;
if (d->type == DLL_LOAD)
loaded_dlls--;
if (end == d)
end = d->prev;
cfree (d);
}
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}
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/* Initialization for all linked DLLs, called by dll_crt0_1. */
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void
dll_list::init ()
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{
/* Walk the dll chain, initializing each dll */
dll *d = &start;
dll_global_dtors_recorded = d->next != NULL;
while ((d = d->next))
d->init ();
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}
#define A64K (64 * 1024)
/* Mark every memory address up to "here" as reserved. This may force
Windows NT to load a DLL in the next available, lowest slot. */
static void
reserve_upto (const PWCHAR name, DWORD here)
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{
DWORD size;
MEMORY_BASIC_INFORMATION mb;
for (DWORD start = 0x10000; start < here; start += size)
if (!VirtualQuery ((void *) start, &mb, sizeof (mb)))
size = A64K;
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else
{
size = A64K * ((mb.RegionSize + A64K - 1) / A64K);
start = A64K * (((DWORD) mb.BaseAddress + A64K - 1) / A64K);
if (start + size > here)
size = here - start;
if (mb.State == MEM_FREE &&
!VirtualAlloc ((void *) start, size, MEM_RESERVE, PAGE_NOACCESS))
api_fatal ("couldn't allocate memory %p(%d) for '%W' alignment, %E\n",
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start, size, name);
}
}
/* Release all of the memory previously allocated by "upto" above.
Note that this may also free otherwise reserved memory. If that becomes
a problem, we'll have to keep track of the memory that we reserve above. */
static void
release_upto (const PWCHAR name, DWORD here)
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{
DWORD size;
MEMORY_BASIC_INFORMATION mb;
for (DWORD start = 0x10000; start < here; start += size)
if (!VirtualQuery ((void *) start, &mb, sizeof (mb)))
size = 64 * 1024;
else
{
size = mb.RegionSize;
if (!(mb.State == MEM_RESERVE && mb.AllocationProtect == PAGE_NOACCESS
&& (((void *) start < cygheap->user_heap.base
|| (void *) start > cygheap->user_heap.top)
&& ((void *) start < (void *) cygheap
|| (void *) start
> (void *) ((char *) cygheap + CYGHEAPSIZE)))))
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continue;
if (!VirtualFree ((void *) start, 0, MEM_RELEASE))
api_fatal ("couldn't release memory %p(%d) for '%W' alignment, %E\n",
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start, size, name);
}
}
/* Reload DLLs after a fork. Iterates over the list of dynamically loaded
DLLs and attempts to load them in the same place as they were loaded in the
parent. */
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void
dll_list::load_after_fork (HANDLE parent)
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{
for (dll *d = &dlls.start; (d = d->next) != NULL; )
if (d->type == DLL_LOAD)
for (int i = 0; i < 2; i++)
{
/* See if DLL will load in proper place. If so, free it and reload
it the right way.
It stinks that we can't invert the order of the initial LoadLibrary
and FreeLibrar since Microsoft documentation seems to imply that
should do what we want. However, once a library is loaded as
above, the second LoadLibrary will not execute its startup code
unless it is first unloaded. */
HMODULE h = LoadLibraryExW (d->name, NULL, DONT_RESOLVE_DLL_REFERENCES);
if (!h)
system_printf ("can't reload %W, %E", d->name);
else
{
FreeLibrary (h);
if (h == d->handle)
h = LoadLibraryW (d->name);
}
/* If we reached here on the second iteration of the for loop
then there is a lot of memory to release. */
if (i > 0)
release_upto (d->name, (DWORD) d->handle);
if (h == d->handle)
break; /* Success */
if (i > 0)
/* We tried once to relocate the dll and it failed. */
api_fatal ("unable to remap %W to same address as parent: %p != %p",
d->name, d->handle, h);
/* Dll loaded in the wrong place. Dunno why this happens but it
always seems to happen when there are multiple DLLs attempting to
load into the same address space. In the "forked" process, the
second DLL always loads into a different location. So, block all
of the memory up to the new load address and try again. */
reserve_upto (d->name, (DWORD) d->handle);
}
*** cygwin DLL Changes: * child_info.h (CURR_CHILD_INFO_MAGIC): Reset. (child_info::dwProcessId): Delete. (child_info::straced): New variable. (child_info::handle_fork): New member function. * dcrt0.cc (in_forkee): New global variable. (__cygwin_user_data::forkee): Mark as obsolete. (do_global_ctors): Use in_forkee rather than user_data->forkee. (get_cygwin_startup_info): Ditto. Deal with new straced field to allow strace to deal with children of attached processes. (initial_env): Accommodate changes to strace::hello. (child_info_fork::handle_fork): Rename from plain old 'handle_fork'. Move alloc_stack() call elsewhere. (dll_crt0_0): Fill out more of user_data. Reference handle_fork via fork_info. Add some debugging output. (_dll_crt0): Don't wait for sync thread if sync_startup is invalid. Zero sync_startup here. Call alloc_stack() here, if appropriate. (dll_crt0_1): Use in_forkee rather than user_data->forkee. (dll_crt0): Ditto. * malloc_wrapper.cc (malloc_init): Ditto. * dll_init.cc (in_forkee): Remove local static version of this variable. (dll_list::load_after_fork): Don't set in_forkee here. * external.cc (cygwin_internal): Use strace method rather than accessing field directly. * fhandler.cc (fhandler_base::read): Ditto. * fhandler_tty.cc (fhandler_tty_common::__acquire_output_mutex): Ditto. * fork.cc (frok::parent): Invoke strace write_childpid to communicate with potential strace. (child_copy): Add more detail to debugging output. * init.cc (calibration_id): New static variable. (prime_threads): Set sync_startup to invalid handle if we already know about thread_func_ix. Use static calibration_id to hold calibration thread id. * munge_threadfunc (munge_threadfunc): Don't try to debug if we don't find threadfunc_ix. (dll_entry): Avoid calling munge_threadfunc and _cygtls::remove on non-cygwin threads invoked during process startup. * pinfo.cc (set_myself): Always call strace.hello here regardless of DEBUGGING. * sigproc.cc (child_info::child_info): Remove spurious handling of dwProcessId. Set straced as appropriate. * spawn.cc (spawn_guts): Rename ciresrv to ch. Invoke strace write_childpid to communicate with potential strace. * strace.cc: Include child_info.h. (strace::hello): Remove inited test. Use active() method to test if strace has been activated. Handle case where we are started before (mypid): New function. (strace::vsprntf): Try to deal more intelligently with case where progname may not be filled out. Put pid in parentheses if it is a windows pid rather than a cygwin pid. myself has been filled out. (strace::write_childpid): New function for notifying strace about the creation of children. (strace::vprntf): Use strace method rather than accessing field directly. (strace_printf): Ditto. (strace::wm): Ditto. * winsup.h (in_forkee): Declare. * include/sys/strace.h (strace::write_childpid): Declare new function. (strace::attached): Define new function. (strace::active): Ditto. (strace::active_val): Ditto. (_STRACE_ON): Delete. (_STRACE_OFF): Ditto. (define_strace0): Use strace method rather than accessing field directly. (strace_printf_wrap): Ditto. (strace_printf_wrap1): Ditto. *** cygwin utils changes: * strace.cc (nprocesses): Make static global. (quiet): New variable. (strace_active): Ditto. (add_child): Increment nprocesses here. Don't add a child if it is already added (windows bug?). Report on child if not quiet. (get_child): Just return NULL if child not found. (remove_child): Report on child if not quiet. (attach_process): Don't complain if given a windows process. Use windows pid in error. (handle_output_debug_string): Issue error if trying to manipulate a process that we don't know about. Handle _STRACE_CHILD_PID - attach to reported child when we get this. (proc_child): Move nprocesses to file scope. Report on exceptions. (longopts): Implement "--quiet". (opts): Implement "-q". (main): Manipulate quiet flag. * utils.sgml (strace): Add words describing '-q'.
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in_forkee = false;
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}
struct dllcrt0_info
{
HMODULE h;
per_process *p;
int res;
dllcrt0_info (HMODULE h0, per_process *p0): h(h0), p(p0) {}
};
extern "C" int
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dll_dllcrt0 (HMODULE h, per_process *p)
{
dllcrt0_info x (h, p);
if (_my_tls.isinitialized ())
dll_dllcrt0_1 (&x);
else
_my_tls.call ((DWORD (*) (void *, void *)) dll_dllcrt0_1, &x);
return x.res;
}
void
dll_dllcrt0_1 (VOID *x)
{
HMODULE& h = ((dllcrt0_info *)x)->h;
per_process*& p = ((dllcrt0_info *)x)->p;
int& res = ((dllcrt0_info *)x)->res;
/* Make sure that our exception handler is installed.
That should always be the case but this just makes sure.
At some point, we may want to just remove this code since
the exception handler should be guaranteed to be installed.
I'm leaving it in until potentially after the release of
1.7.1 */
_my_tls.init_exception_handler (_cygtls::handle_exceptions);
if (p == NULL)
p = &__cygwin_user_data;
else
*(p->impure_ptr_ptr) = __cygwin_user_data.impure_ptr;
bool linked = !in_forkee && !cygwin_finished_initializing;
/* Broken DLLs built against Cygwin versions 1.7.0-49 up to 1.7.0-57
override the cxx_malloc pointer in their DLL initialization code,
when loaded either statically or dynamically. Because this leaves
a stale pointer into demapped memory space if the DLL is unloaded
by a call to dlclose, we prevent this happening for dynamically
loaded DLLS in dlopen by saving and restoring cxx_malloc around
the call to LoadLibrary, which invokes the DLL's startup sequence.
Modern DLLs won't even attempt to override the pointer when loaded
statically, but will write their overrides directly into the
struct it points to. With all modern DLLs, this will remain the
default_cygwin_cxx_malloc struct in cxx.cc, but if any broken DLLs
are in the mix they will have overridden the pointer and subsequent
overrides will go into their embedded cxx_malloc structs. This is
almost certainly not a problem as they can never be unloaded, but
if we ever did want to do anything about it, we could check here to
see if the pointer had been altered in the early parts of the DLL's
startup, and if so copy back the new overrides and reset it here.
However, that's just a note for the record; at the moment, we can't
see any need to worry about this happening. */
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/* Partially initialize Cygwin guts for non-cygwin apps. */
if (dynamically_loaded && user_data->magic_biscuit == 0)
dll_crt0 (p);
else
check_sanity_and_sync (p);
dll_type type;
/* If this function is called before cygwin has finished
initializing, then the DLL must be a cygwin-aware DLL
that was explicitly linked into the program rather than
a dlopened DLL. */
if (linked)
type = DLL_LINK;
else
{
type = DLL_LOAD;
dlls.reload_on_fork = 1;
}
/* Allocate and initialize space for the DLL. */
dll *d = dlls.alloc (h, p, type);
/* If d == NULL, then something is broken.
Otherwise, if we've finished initializing, it's ok to
initialize the DLL. If we haven't finished initializing,
it may not be safe to call the dll's "main" since not
all of cygwin's internal structures may have been set up. */
if (!d || (!linked && !d->init ()))
res = -1;
else
res = (DWORD) d;
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}
/* OBSOLETE: This function is obsolete and will go away in the
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future. Cygwin can now handle being loaded from a noncygwin app
using the same entry point. */
extern "C" int
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dll_noncygwin_dllcrt0 (HMODULE h, per_process *p)
{
return dll_dllcrt0 (h, p);
}
extern "C" void
cygwin_detach_dll (dll *)
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{
HANDLE retaddr;
if (_my_tls.isinitialized ())
retaddr = (void *) _my_tls.retaddr ();
else
retaddr = __builtin_return_address (0);
dlls.detach (retaddr);
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}
extern "C" void
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dlfork (int val)
{
dlls.reload_on_fork = val;
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}
/* Called from various places to update all of the individual
ideas of the environ block. Explain to me again why we didn't
just import __cygwin_environ? */
void __stdcall
update_envptrs ()
{
for (dll *d = dlls.istart (DLL_ANY); d; d = dlls.inext ())
*(d->p.envptr) = __cygwin_environ;
*main_environ = __cygwin_environ;
}