newlib-cygwin/winsup/cygwin/debug.cc

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/* debug.cc
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Copyright 1998, 1999, 2000, 2001 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 "exceptions.h"
#include "sync.h"
#include "sigproc.h"
#include "pinfo.h"
#include "perthread.h"
#include "perprocess.h"
#include "security.h"
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#undef CloseHandle
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static muto NO_COPY *threadname_lock = NULL;
#define lock_threadname() \
do {if (threadname_lock) threadname_lock->acquire (INFINITE); } while (0)
#define unlock_threadname() \
do {if (threadname_lock) threadname_lock->release (); } while (0)
typedef struct
{
DWORD id;
const char *name;
} thread_info;
static NO_COPY thread_info threads[32] = {{0, NULL}}; // increase as necessary
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#define NTHREADS (sizeof (threads) / sizeof (threads[0]))
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void
threadname_init ()
{
threadname_lock = new_muto (FALSE, "threadname_lock");
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}
void __stdcall
regthread (const char *name, DWORD tid)
{
lock_threadname ();
for (DWORD i = 0; i < NTHREADS; i++)
if (threads[i].name == NULL || strcmp (threads[i].name, name) == 0 ||
threads[i].id == tid)
{
threads[i].name = name;
threads[i].id = tid;
break;
}
unlock_threadname ();
}
int __stdcall
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iscygthread ()
{
DWORD tid = GetCurrentThreadId ();
if (tid != mainthread.id)
for (DWORD i = 0; i < NTHREADS && threads[i].name != NULL; i++)
if (threads[i].id == tid)
return 1;
return 0;
}
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struct thread_start
{
LONG notavail;
LPTHREAD_START_ROUTINE func;
VOID *arg;
};
/* A place to store arguments to thread_stub since they can't be
stored on the stack. An available element is !notavail. */
thread_start NO_COPY start_buf[NTHREADS] = {{0, NULL,NULL}};
/* Initial stub called by makethread. Performs initial per-thread
initialization. */
static DWORD WINAPI
thread_stub (VOID *arg)
{
LPTHREAD_START_ROUTINE threadfunc = ((thread_start *) arg)->func;
VOID *threadarg = ((thread_start *) arg)->arg;
exception_list except_entry;
/* Give up our slot in the start_buf array */
(void) InterlockedExchange (&((thread_start *) arg)->notavail, 0);
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* Makefile.in: Use variables rather than configure constructs where appropriate. (LIBCOS): Find additional stub library stuff in their own subdirectory. * dcrt0.cc: Convert user_data pointer to static __cygwin_user_data area. (do_global_ctors): Check magic_bisquit for initialization. (dll_crt0_1): First group of premain functions prior to fd initialization. Run second group before calling main. (dll_crt0 ()): New function, called from new initialization code. (dll_crt0 (per_process *uptr)): Call new dll_crt0 () function on initialization. * debug.cc (thread_stub): Initialize bottom of stack with per-thread info. * environ.cc (parse_thing): Use binmode global to control CYGWIN=binmode behavior. * fhandler.cc (fhandler_base::open): Allow explicit setting of __fmode to O_BINARY or O_TEXT to override disk mount settings. * libcmain.cc: Move to lib subdirectory. * libccrt0.cc: Ditto. * dll_main.cc: Ditto. * dll_entry.cc: Ditto. * getopt.c: Ditto. * thread.cc (thread_init_wrapper): Call ExitThread explicitly rather than returning, as a preliminary step towards placing per thread info at the bottom of the stack. * winsup.h: Move per_process class to include/sys/cygwin.h. Declare new dll_crt0(). * include/cygwin/version.h: Bump API minor version. * binmode.c: New file. * textmode.c: Ditto. * lib/_cygwin_crt0_common.cc: Ditto. * lib/crt0.h: Ditto. * lib/cygwin_attach_dll.c: Ditto. * lib/cygwin_crt0.c: Ditto. * lib/dll_entry.cc: Ditto. * lib/dll_main.cc: Ditto. * lib/getopt.c: Ditto. * lib/libcmain.c: Ditto. * lib/premain0.c: Ditto. * lib/premain1.c: Ditto. * lib/premain2.c: Ditto. * lib/premain3.c: Ditto.
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/* Initialize this thread's ability to respond to things like
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SIGSEGV or SIGFPE. */
init_exceptions (&except_entry);
set_reent (user_data->impure_ptr);
* Makefile.in: Use variables rather than configure constructs where appropriate. (LIBCOS): Find additional stub library stuff in their own subdirectory. * dcrt0.cc: Convert user_data pointer to static __cygwin_user_data area. (do_global_ctors): Check magic_bisquit for initialization. (dll_crt0_1): First group of premain functions prior to fd initialization. Run second group before calling main. (dll_crt0 ()): New function, called from new initialization code. (dll_crt0 (per_process *uptr)): Call new dll_crt0 () function on initialization. * debug.cc (thread_stub): Initialize bottom of stack with per-thread info. * environ.cc (parse_thing): Use binmode global to control CYGWIN=binmode behavior. * fhandler.cc (fhandler_base::open): Allow explicit setting of __fmode to O_BINARY or O_TEXT to override disk mount settings. * libcmain.cc: Move to lib subdirectory. * libccrt0.cc: Ditto. * dll_main.cc: Ditto. * dll_entry.cc: Ditto. * getopt.c: Ditto. * thread.cc (thread_init_wrapper): Call ExitThread explicitly rather than returning, as a preliminary step towards placing per thread info at the bottom of the stack. * winsup.h: Move per_process class to include/sys/cygwin.h. Declare new dll_crt0(). * include/cygwin/version.h: Bump API minor version. * binmode.c: New file. * textmode.c: Ditto. * lib/_cygwin_crt0_common.cc: Ditto. * lib/crt0.h: Ditto. * lib/cygwin_attach_dll.c: Ditto. * lib/cygwin_crt0.c: Ditto. * lib/dll_entry.cc: Ditto. * lib/dll_main.cc: Ditto. * lib/getopt.c: Ditto. * lib/libcmain.c: Ditto. * lib/premain0.c: Ditto. * lib/premain1.c: Ditto. * lib/premain2.c: Ditto. * lib/premain3.c: Ditto.
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ExitThread (threadfunc (threadarg));
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}
/* Wrapper for CreateThread. Registers the thread name/id and ensures that
cygwin threads are properly initialized. */
HANDLE __stdcall
makethread (LPTHREAD_START_ROUTINE start, LPVOID param, DWORD flags,
const char *name)
{
DWORD tid;
HANDLE h;
SECURITY_ATTRIBUTES *sa;
thread_start *info; /* Various information needed by the newly created thread */
for (;;)
{
/* Search the start_buf array for an empty slot to use */
for (info = start_buf; info < start_buf + NTHREADS; info++)
if (!InterlockedExchange (&info->notavail, 1))
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goto out;
/* Should never hit here, but be defensive anyway. */
Sleep (0);
}
out:
info->func = start; /* Real function to start */
info->arg = param; /* The single parameter to the thread */
if (*name != '+')
sa = &sec_none_nih; /* The handle should not be inherited by subprocesses. */
else
{
name++;
sa = &sec_none; /* The handle should be inherited by subprocesses. */
}
if ((h = CreateThread (sa, 0, thread_stub, (VOID *) info, flags, &tid)))
regthread (name, tid); /* Register this name/thread id for debugging output. */
return h;
}
/* Return the symbolic name of the current thread for debugging.
*/
const char * __stdcall
threadname (DWORD tid, int lockit)
{
const char *res = NULL;
if (!tid)
tid = GetCurrentThreadId ();
if (lockit)
lock_threadname ();
for (DWORD i = 0; i < NTHREADS && threads[i].name != NULL; i++)
if (threads[i].id == tid)
{
res = threads[i].name;
break;
}
if (lockit)
unlock_threadname ();
if (!res)
{
static char buf[30] NO_COPY = {0};
__small_sprintf (buf, "unknown (%p)", tid);
res = buf;
}
return res;
}
#ifdef DEBUGGING
/* Here lies extra debugging routines which help track down internal
Cygwin problems when compiled with -DDEBUGGING . */
#include <stdlib.h>
typedef struct _h
{
BOOL allocated;
HANDLE h;
const char *name;
const char *func;
int ln;
DWORD clexec_pid;
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struct _h *next;
} handle_list;
static NO_COPY handle_list starth = {0, NULL, NULL, NULL, 0, 0, NULL};
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static NO_COPY handle_list *endh = NULL;
static handle_list NO_COPY freeh[1000] = {{0, NULL, NULL, NULL, 0, 0, NULL}};
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#define NFREEH (sizeof (freeh) / sizeof (freeh[0]))
static muto NO_COPY *debug_lock = NULL;
#define lock_debug() \
do {if (debug_lock) debug_lock->acquire (INFINITE); } while (0)
#define unlock_debug() \
do {if (debug_lock) debug_lock->release (); } while (0)
static bool __stdcall mark_closed (const char *, int, HANDLE, const char *, BOOL);
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void
debug_init ()
{
debug_lock = new_muto (FALSE, "debug_lock");
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}
/* Find a registered handle in the linked list of handles. */
static handle_list * __stdcall
find_handle (HANDLE h)
{
handle_list *hl;
for (hl = &starth; hl->next != NULL; hl = hl->next)
if (hl->next->h == h)
goto out;
endh = hl;
hl = NULL;
out:
return hl;
}
void
setclexec_pid (HANDLE h, bool setit)
{
handle_list *hl = find_handle (h);
if (hl)
hl->clexec_pid = setit ? GetCurrentProcessId () : 0;
}
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/* Create a new handle record */
static handle_list * __stdcall
newh ()
{
handle_list *hl;
lock_debug ();
for (hl = freeh; hl < freeh + NFREEH; hl++)
if (hl->name == NULL)
goto out;
/* All used up??? */
if ((hl = (handle_list *) malloc (sizeof *hl)) != NULL)
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{
memset (hl, 0, sizeof (*hl));
hl->allocated = TRUE;
}
out:
unlock_debug ();
return hl;
}
/* Add a handle to the linked list of known handles. */
void __stdcall
add_handle (const char *func, int ln, HANDLE h, const char *name)
{
handle_list *hl;
lock_debug ();
if ((hl = find_handle (h)))
{
hl = hl->next;
system_printf ("%s:%d - multiple attempts to add handle %s<%p>", func,
ln, name, h);
system_printf (" previously allocated by %s:%d(%s<%p>)",
hl->func, hl->ln, hl->name, hl->h);
goto out; /* Already did this once */
}
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if ((hl = newh ()) == NULL)
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{
unlock_debug ();
system_printf ("couldn't allocate memory for %s(%d): %s(%p)",
func, ln, name, h);
return;
}
hl->h = h;
hl->name = name;
hl->func = func;
hl->ln = ln;
hl->next = NULL;
endh->next = hl;
endh = hl;
out:
unlock_debug ();
}
static void __stdcall
delete_handle (handle_list *hl)
{
handle_list *hnuke = hl->next;
hl->next = hl->next->next;
if (hnuke->allocated)
free (hnuke);
else
memset (hnuke, 0, sizeof (*hnuke));
}
void
debug_fixup_after_fork ()
{
handle_list *hl;
for (hl = &starth; hl->next != NULL; hl = hl->next)
if (hl->next->clexec_pid)
delete_handle (hl);
}
static bool __stdcall
mark_closed (const char *func, int ln, HANDLE h, const char *name, BOOL force)
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{
handle_list *hl;
lock_debug ();
if ((hl = find_handle (h)) && !force)
{
hl = hl->next;
unlock_debug (); // race here
system_printf ("attempt to close protected handle %s:%d(%s<%p>)",
hl->func, hl->ln, hl->name, hl->h);
system_printf (" by %s:%d(%s<%p>)", func, ln, name, h);
return FALSE;
}
handle_list *hln;
if (hl && (hln = hl->next) && strcmp (name, hln->name))
{
system_printf ("closing protected handle %s:%d(%s<%p>)",
hln->func, hln->ln, hln->name, hln->h);
system_printf (" by %s:%d(%s<%p>)", func, ln, name, h);
}
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if (hl)
delete_handle (hl);
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unlock_debug ();
return TRUE;
}
/* Close a known handle. Complain if !force and closing a known handle or
if the name of the handle being closed does not match the registered name. */
BOOL __stdcall
close_handle (const char *func, int ln, HANDLE h, const char *name, BOOL force)
{
BOOL ret;
lock_debug ();
if (!mark_closed (func, ln, h, name, force))
return FALSE;
ret = CloseHandle (h);
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unlock_debug ();
#if 0 /* Uncomment to see CloseHandle failures */
if (!ret)
small_printf ("CloseHandle(%s) failed %s:%d\n", name, func, ln);
#endif
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return ret;
}
#endif /*DEBUGGING*/