* external.cc (cygwin_internal): Implement CW_CMDLINE.

* pinfo.h (SIGCOMMUNE): New signal type.
(commune_result): New structure for commune functions.
(picom): New enum for commune functions.
(_pinfo::hello_pid): New.  Pid who's communicating with me.
(_pinfo::tothem): New.  Handle of communicating pipe.
(_pinfo::fromthem): Ditto.
(_pinfo::commune_recv): Declare.
(_pinfo::commune_send): Declare.
(_pinfo::alive): Declare.
(_pinfo::cmdline): Declare.
(_pinfo::lock): Declare.
* pinfo.cc (set_myself): Initialize new _pinfo lock.
(_pinfo::alive): Define.  Determines if process still exists.
(_pinfo::commune_recv): Define.  Receive info from another cooperating process.
(_pinfo::commune_send): Define.  Send info to another cooperating process.
(_pinfo::cmdline): Define.  Determine command line of a given process.
* include/sys/cygwin.h (CW_CMDLINE): Define.
*sigproc.cc (talktome): Communicate with any processes who want to talk to me.
(wait_sig): Honor __SIGCOMMUNE.
* fhandler.cc (fhandler_virtual::fixup_after_exec): Declare.
* fhandler_proc.cc: Use malloc/free/realloc throughout rather than cmalloc
since buffers don't need to be propagated to subprocesses.
* fhandler_registry.cc: Ditto.
* fhandler_virtual.cc: Ditto.
(fhandler_virtual::fixup_after_exec): Define.
* fhandler_process.cc: Ditto for malloc/free/realloc.
(process_listin): Add "cmdline".
(fhandler_process::fill_filebuf): Implement PROCESS_CMDLINE.
* miscfuncs.cc (isalpha_array): New array populated with xor values for alpha
characters to switch from one case to another.
* string.h (cygwin_strcasematch): New asm implementation of case match.
* string.h (cygwin_nstrcasematch): New asm implementation of counted case
match.

13 files changed, 434 insertions, 38 deletions

diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 8983a8e61..6098198be 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,44 @@
+2002-10-30  Christopher Faylor  <cgf@redhat.com>
+
+	* external.cc (cygwin_internal): Implement CW_CMDLINE.
+	* pinfo.h (SIGCOMMUNE): New signal type.
+	(commune_result): New structure for commune functions.
+	(picom): New enum for commune functions.
+	(_pinfo::hello_pid): New.  Pid who's communicating with me.
+	(_pinfo::tothem): New.  Handle of communicating pipe.
+	(_pinfo::fromthem): Ditto.
+	(_pinfo::commune_recv): Declare.
+	(_pinfo::commune_send): Declare.
+	(_pinfo::alive): Declare.
+	(_pinfo::cmdline): Declare.
+	(_pinfo::lock): Declare.
+	* pinfo.cc (set_myself): Initialize new _pinfo lock.
+	(_pinfo::alive): Define. Determines if process still exists.
+	(_pinfo::commune_recv): Define.  Receive info from another cooperating process.
+	(_pinfo::commune_send): Define.  Send info to another cooperating process.
+	(_pinfo::cmdline): Define.  Determine command line of a given process.
+	* include/sys/cygwin.h (CW_CMDLINE): Define.
+
+	*sigproc.cc (talktome): Communicate with any processes who want to talk
+	to me.
+	(wait_sig): Honor __SIGCOMMUNE.
+
+	* fhandler.cc (fhandler_virtual::fixup_after_exec): Declare.
+	* fhandler_proc.cc: Use malloc/free/realloc throughout rather than
+	cmalloc since buffers don't need to be propagated to subprocesses.
+	* fhandler_registry.cc: Ditto.
+	* fhandler_virtual.cc: Ditto.
+	(fhandler_virtual::fixup_after_exec): Define.
+	* fhandler_process.cc: Ditto for malloc/free/realloc.
+	(process_listin): Add "cmdline".
+	(fhandler_process::fill_filebuf): Implement PROCESS_CMDLINE.
+
+	* miscfuncs.cc (isalpha_array): New array populated with xor values for
+	alpha characters to switch from one case to another.
+	* string.h (cygwin_strcasematch): New asm implementation of case match.
+	* string.h (cygwin_nstrcasematch): New asm implementation of counted
+	case match.
+
 2002-10-24  Pierre Humblet <pierre.humblet@ieee.org>
   
 	* pwdgrp.h (pwdgrp_read::open): Compare fh to INVALID_HANDLE_VALUE.
diff --git a/winsup/cygwin/external.cc b/winsup/cygwin/external.cc
index 571ea6742..406786d7c 100644
--- a/winsup/cygwin/external.cc
+++ b/winsup/cygwin/external.cc
@@ -241,6 +241,13 @@ cygwin_internal (cygwin_getinfo_types t, ...)
 	  extract_nt_dom_user (pw, domain, user);
 	  return 0;
 	}
+      case CW_CMDLINE:
+	{
+	  size_t n;
+	  pid_t pid = va_arg (arg, pid_t);
+	  pinfo p (pid);
+	  return (DWORD) p->cmdline (n);
+	}
       default:
 	return (DWORD) -1;
     }
diff --git a/winsup/cygwin/fhandler.h b/winsup/cygwin/fhandler.h
index c0846ab9a..796c3e6bb 100644
--- a/winsup/cygwin/fhandler.h
+++ b/winsup/cygwin/fhandler.h
@@ -1107,6 +1107,7 @@ class fhandler_virtual : public fhandler_base
   int close (void);
   int __stdcall fstat (struct stat *buf, path_conv *pc) __attribute__ ((regparm (3)));
   virtual bool fill_filebuf ();
+  void fixup_after_exec (HANDLE);
 };
 
 class fhandler_proc: public fhandler_virtual
diff --git a/winsup/cygwin/fhandler_proc.cc b/winsup/cygwin/fhandler_proc.cc
index 86c3c81fb..f887e8cb7 100644
--- a/winsup/cygwin/fhandler_proc.cc
+++ b/winsup/cygwin/fhandler_proc.cc
@@ -327,7 +327,7 @@ fhandler_proc::fill_filebuf ()
 	    uname (&uts_name);
 		bufalloc = strlen (uts_name.sysname) + 1 + strlen (uts_name.release) +
 			  1 + strlen (uts_name.version) + 2;
-	    filebuf = (char *) cmalloc (HEAP_BUF, bufalloc);
+	    filebuf = (char *) realloc (filebuf, bufalloc);
 		filesize = __small_sprintf (filebuf, "%s %s %s\n", uts_name.sysname,
 			     uts_name.release, uts_name.version);
 	  }
@@ -335,15 +335,13 @@ fhandler_proc::fill_filebuf ()
       }
     case PROC_UPTIME:
       {
-	if (!filebuf)
-	  filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = 80);
+	filebuf = (char *) realloc (filebuf, bufalloc = 80);
 	filesize = format_proc_uptime (filebuf, bufalloc);
 	break;
       }
     case PROC_STAT:
       {
-	if (!filebuf)
-	  filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = 2048);
+	filebuf = (char *) realloc (filebuf, bufalloc = 2048);
 	filesize = format_proc_stat (filebuf, bufalloc);
 	break;
       }
@@ -354,16 +352,14 @@ fhandler_proc::fill_filebuf ()
 	 * Windows 95/98/me does have the KERNEL/CPUUsage performance counter
 	 * which is similar.
 	 */
-	if (!filebuf)
-	  filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = 16);
+	filebuf = (char *) realloc (filebuf, bufalloc = 16);
 	filesize = __small_sprintf (filebuf, "%u.%02u %u.%02u %u.%02u\n",
 				    0, 0, 0, 0, 0, 0);
 	break;
       }
     case PROC_MEMINFO:
       {
-	if (!filebuf)
-	  filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = 2048);
+	filebuf = (char *) realloc (filebuf, bufalloc = 2048);
 	filesize = format_proc_meminfo (filebuf, bufalloc);
 	break;
       }
diff --git a/winsup/cygwin/fhandler_process.cc b/winsup/cygwin/fhandler_process.cc
index 7cbfaa3cd..a9e8d2f0c 100644
--- a/winsup/cygwin/fhandler_process.cc
+++ b/winsup/cygwin/fhandler_process.cc
@@ -42,6 +42,7 @@ static const int PROCESS_SID = 10;
 static const int PROCESS_CTTY = 11;
 static const int PROCESS_STAT = 12;
 static const int PROCESS_STATM = 13;
+static const int PROCESS_CMDLINE = 14;
 
 static const char * const process_listing[] =
 {
@@ -59,6 +60,7 @@ static const char * const process_listing[] =
   "ctty",
   "stat",
   "statm",
+  "cmdline",
   NULL
 };
 
@@ -264,8 +266,7 @@ fhandler_process::fill_filebuf ()
     case PROCESS_CTTY:
     case PROCESS_PPID:
       {
-	if (!filebuf)
-	  filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = 40);
+	filebuf = (char *) realloc (filebuf, bufalloc = 40);
 	int num;
 	switch (fileid)
 	  {
@@ -295,10 +296,18 @@ fhandler_process::fill_filebuf ()
 	filesize = strlen (filebuf);
 	break;
       }
+    case PROCESS_CMDLINE:
+      {
+	if (filebuf)
+	  free (filebuf);
+	filebuf = p->cmdline (filesize);
+	if (!*filebuf)
+	  filebuf = strdup ("<defunct>");
+	break;
+      }
     case PROCESS_EXENAME:
       {
-	if (!filebuf)
-	  filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = MAX_PATH);
+	filebuf = (char *) realloc (filebuf, bufalloc = MAX_PATH);
 	if (p->process_state & (PID_ZOMBIE | PID_EXITED))
 	  strcpy (filebuf, "<defunct>");
 	else
@@ -317,8 +326,7 @@ fhandler_process::fill_filebuf ()
       }
     case PROCESS_WINPID:
       {
-	if (!filebuf)
-	  filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = 40);
+	filebuf = (char *) realloc (filebuf, bufalloc = 40);
 	__small_sprintf (filebuf, "%d\n", p->dwProcessId);
 	filesize = strlen (filebuf);
 	break;
@@ -326,8 +334,7 @@ fhandler_process::fill_filebuf ()
     case PROCESS_WINEXENAME:
       {
 	int len = strlen (p->progname);
-	if (!filebuf)
-	  filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = (len + 2));
+	filebuf = (char *) realloc (filebuf, bufalloc = (len + 2));
 	strcpy (filebuf, p->progname);
 	filebuf[len] = '\n';
 	filesize = len + 1;
@@ -335,22 +342,19 @@ fhandler_process::fill_filebuf ()
       }
     case PROCESS_STATUS:
       {
-	if (!filebuf)
-	  filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = 2048);
+	filebuf = (char *) realloc (filebuf, bufalloc = 2048);
 	filesize = format_process_status (*p, filebuf, bufalloc);
 	break;
       }
     case PROCESS_STAT:
       {
-	if (!filebuf)
-	  filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = 2048);
+	filebuf = (char *) realloc (filebuf, bufalloc = 2048);
 	filesize = format_process_stat (*p, filebuf, bufalloc);
 	break;
       }
     case PROCESS_STATM:
       {
-	if (!filebuf)
-	  filebuf = (char *) cmalloc (HEAP_BUF, bufalloc = 2048);
+	filebuf = (char *) realloc (filebuf, bufalloc = 2048);
 	filesize = format_process_statm (*p, filebuf, bufalloc);
 	break;
       }
diff --git a/winsup/cygwin/fhandler_registry.cc b/winsup/cygwin/fhandler_registry.cc
index f2e5e2145..8a9f27ed9 100644
--- a/winsup/cygwin/fhandler_registry.cc
+++ b/winsup/cygwin/fhandler_registry.cc
@@ -555,7 +555,7 @@ fhandler_registry::fill_filebuf ()
 	  goto value_not_found;
 	}
       bufalloc = size;
-      filebuf = (char *) cmalloc (HEAP_BUF, bufalloc);
+      filebuf = (char *) malloc (bufalloc);
       error =
 	RegQueryValueEx (handle, value_name, NULL, NULL, (BYTE *) filebuf,
 			 &size);
@@ -572,14 +572,9 @@ fhandler_registry::fill_filebuf ()
       do
 	{
 	  bufalloc += 1000;
-	  if (filebuf)
-	    {
-	      cfree (filebuf);
-	      filebuf = (char *) cmalloc (HEAP_BUF, bufalloc);
-	    }
-	  error =
-	    RegQueryValueEx (handle, value_name, NULL, &type,
-			     (BYTE *) filebuf, &size);
+	  filebuf = (char *) realloc (filebuf, bufalloc);
+	  error = RegQueryValueEx (handle, value_name, NULL, &type,
+				   (BYTE *) filebuf, &size);
 	  if (error != ERROR_SUCCESS && error != ERROR_MORE_DATA)
 	    {
 	      if (error != ERROR_FILE_NOT_FOUND)
diff --git a/winsup/cygwin/fhandler_virtual.cc b/winsup/cygwin/fhandler_virtual.cc
index 05b9b0f6c..937caf352 100644
--- a/winsup/cygwin/fhandler_virtual.cc
+++ b/winsup/cygwin/fhandler_virtual.cc
@@ -34,10 +34,17 @@ fhandler_virtual::fhandler_virtual (DWORD devtype):
 fhandler_virtual::~fhandler_virtual ()
 {
   if (filebuf)
-    cfree (filebuf);
+    free (filebuf);
   filebuf = NULL;
 }
 
+void
+fhandler_virtual::fixup_after_exec (HANDLE)
+{
+  if (filebuf)
+    filebuf = NULL;
+}
+
 DIR *
 fhandler_virtual::opendir (path_conv& pc)
 {
@@ -143,7 +150,7 @@ fhandler_virtual::dup (fhandler_base * child)
   if (!ret)
     {
       fhandler_virtual *fhproc_child = (fhandler_virtual *) child;
-      fhproc_child->filebuf = (char *) cmalloc (HEAP_BUF, filesize);
+      fhproc_child->filebuf = (char *) malloc (filesize);
       fhproc_child->bufalloc = fhproc_child->filesize = filesize;
       fhproc_child->position = position;
       memcpy (fhproc_child->filebuf, filebuf, filesize);
@@ -156,7 +163,7 @@ int
 fhandler_virtual::close ()
 {
   if (filebuf)
-    cfree (filebuf);
+    free (filebuf);
   filebuf = NULL;
   bufalloc = (size_t) -1;
   cygwin_shared->delqueue.process_queue ();
diff --git a/winsup/cygwin/include/sys/cygwin.h b/winsup/cygwin/include/sys/cygwin.h
index b9128119e..54a6d0d5c 100644
--- a/winsup/cygwin/include/sys/cygwin.h
+++ b/winsup/cygwin/include/sys/cygwin.h
@@ -70,7 +70,8 @@ typedef enum
     CW_STRACE_TOGGLE,
     CW_STRACE_ACTIVE,
     CW_CYGWIN_PID_TO_WINPID,
-    CW_EXTRACT_DOMAIN_AND_USER
+    CW_EXTRACT_DOMAIN_AND_USER,
+    CW_CMDLINE
   } cygwin_getinfo_types;
 
 #define CW_NEXTPID	0x80000000	// or with pid to get next one
diff --git a/winsup/cygwin/miscfuncs.cc b/winsup/cygwin/miscfuncs.cc
index a6fec0ddc..fd7ae8edf 100644
--- a/winsup/cygwin/miscfuncs.cc
+++ b/winsup/cygwin/miscfuncs.cc
@@ -57,8 +57,29 @@ const char case_folded_upper[] NO_COPY = {
  240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
 };
 
+const char isalpha_array[] NO_COPY = {
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
+0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,   0,   0,   0,   0,   0,
+   0,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
+0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,   0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
+   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0
+};
+
 #define ch_case_eq(ch1, ch2) (cyg_tolower(ch1) == cyg_tolower(ch2))
 
+#if 0
+
 /* Return TRUE if two strings match up to length n */
 extern "C" int __stdcall
 strncasematch (const char *s1, const char *s2, size_t n)
@@ -91,6 +112,7 @@ strcasematch (const char *s1, const char *s2)
     }
   return *s2 == '\0';
 }
+#endif
 
 extern "C" char * __stdcall
 strcasestr (const char *searchee, const char *lookfor)
diff --git a/winsup/cygwin/pinfo.cc b/winsup/cygwin/pinfo.cc
index 0ffd00edd..b294130d7 100644
--- a/winsup/cygwin/pinfo.cc
+++ b/winsup/cygwin/pinfo.cc
@@ -66,6 +66,7 @@ set_myself (pid_t pid, HANDLE h)
   (void) GetModuleFileName (NULL, myself->progname, sizeof (myself->progname));
   if (!strace.active)
     strace.hello ();
+  InitializeCriticalSection (&myself->lock);
   return;
 }
 
@@ -230,6 +231,227 @@ pinfo::init (pid_t n, DWORD flag, HANDLE in_h)
   destroy = 1;
 }
 
+bool
+_pinfo::alive ()
+{
+  HANDLE h = OpenProcess (PROCESS_QUERY_INFORMATION, false, dwProcessId);
+  if (h)
+    CloseHandle (h);
+  return !!h;
+}
+
+extern char **__argv;
+
+void
+_pinfo::commune_recv ()
+{
+  DWORD nr;
+  DWORD code;
+  HANDLE hp;
+  HANDLE __fromthem = NULL;
+  HANDLE __tothem = NULL;
+
+  hp = OpenProcess (PROCESS_DUP_HANDLE, false, dwProcessId);
+  if (!hp)
+    {
+      sigproc_printf ("couldn't open handle for pid %d(%u)", pid, dwProcessId);
+      hello_pid = -1;
+      return;
+    }
+  if (!DuplicateHandle (hp, fromthem, hMainProc, &__fromthem, 0, false, DUPLICATE_SAME_ACCESS))
+    {
+      sigproc_printf ("couldn't duplicate fromthem, %E");
+      CloseHandle (hp);
+      hello_pid = -1;
+      return;
+    }
+
+  if (!DuplicateHandle (hp, tothem, hMainProc, &__tothem, 0, false, DUPLICATE_SAME_ACCESS))
+    {
+      sigproc_printf ("couldn't duplicate tothem, %E");
+      CloseHandle (__fromthem);
+      CloseHandle (hp);
+      hello_pid = -1;
+      return;
+    }
+
+  CloseHandle (hp);
+  hello_pid = 0;
+
+  if (!ReadFile (__fromthem, &code, sizeof code, &nr, NULL) || nr != sizeof code)
+    {
+      /* __seterrno ();*/	// this is run from the signal thread, so don't set errno
+      goto out;
+    }
+
+  switch (code)
+    {
+    case PICOM_CMDLINE:
+      {
+	unsigned n = 1;
+	CloseHandle (__fromthem); __fromthem = NULL;
+	for (char **a = __argv; *a; a++)
+	  n += strlen (*a) + 1;
+	if (!WriteFile (__tothem, &n, sizeof n, &nr, NULL))
+	  {
+	    /*__seterrno ();*/	// this is run from the signal thread, so don't set errno
+	    sigproc_printf ("WriteFile sizeof argv failed, %E");
+	  }
+	else
+	  for (char **a = __argv; *a; a++)
+	    if (!WriteFile (__tothem, *a, strlen (*a) + 1, &nr, NULL))
+	      {
+		sigproc_printf ("WriteFile arg %d failed, %E", a - __argv);
+		break;
+	      }
+	  if (!WriteFile (__tothem, "", 1, &nr, NULL))
+	    {
+	      sigproc_printf ("WriteFile null failed, %E");
+	      break;
+	    }
+      }
+    }
+
+out:
+  if (__fromthem)
+    CloseHandle (__fromthem);
+  if (__tothem)
+    CloseHandle (__tothem);
+}
+
+#define PIPEBUFSIZE (16 * sizeof (DWORD))
+
+commune_result
+_pinfo::commune_send (DWORD code)
+{
+  HANDLE fromthem = NULL, tome = NULL;
+  HANDLE fromme = NULL, tothem = NULL;
+  DWORD nr;
+  commune_result res;
+  if (!pid || !this)
+    {
+      set_errno (ESRCH);
+      goto err;
+    }
+  if (!CreatePipe (&fromthem, &tome, &sec_all_nih, PIPEBUFSIZE))
+    {
+      sigproc_printf ("first CreatePipe failed, %E");
+      __seterrno ();
+      goto err;
+    }
+  if (!CreatePipe (&fromme, &tothem, &sec_all_nih, PIPEBUFSIZE))
+    {
+      sigproc_printf ("first CreatePipe failed, %E");
+      __seterrno ();
+      goto err;
+    }
+  EnterCriticalSection (&myself->lock);
+  myself->tothem = tome;
+  myself->fromthem = fromme;
+  myself->hello_pid = pid;
+  if (!WriteFile (tothem, &code, sizeof code, &nr, NULL) || nr != sizeof code)
+    {
+      __seterrno ();
+      goto err;
+    }
+
+  if (sig_send (this, __SIGCOMMUNE))
+    goto err;
+
+  bool isalive;
+  while ((isalive = alive ()))
+    if (myself->hello_pid <= 0)
+      break;
+    else
+      Sleep (0);
+
+  CloseHandle (tome);
+  tome = NULL;
+  CloseHandle (fromme);
+  fromme = NULL;
+
+  if (!isalive)
+    {
+      set_errno (ESRCH);
+      goto err;
+    }
+
+  if (myself->hello_pid < 0)
+    {
+      set_errno (ENOSYS);
+      goto err;
+    }
+
+  size_t n;
+  if (!ReadFile (fromthem, &n, sizeof n, &nr, NULL) || nr != sizeof n)
+    {
+      __seterrno ();
+      goto err;
+    }
+  switch (code)
+    {
+    case PICOM_CMDLINE:
+      res.s = (char *) malloc (n);
+      char *p;
+      for (p = res.s; ReadFile (fromthem, p, n, &nr, NULL); p += nr)
+	continue;
+      if ((unsigned) (p - res.s) != n)
+	{
+	  __seterrno ();
+	  goto err;
+	}
+      res.n = n;
+      break;
+    }
+  CloseHandle (tothem);
+  CloseHandle (fromthem);
+  goto out;
+
+err:
+  if (tome)
+    CloseHandle (tome);
+  if (fromthem)
+    CloseHandle (fromthem);
+  if (tothem)
+    CloseHandle (tothem);
+  if (fromme)
+    CloseHandle (fromme);
+  res.n = 0;
+out:
+  myself->hello_pid = 0;
+  LeaveCriticalSection (&lock);
+  return res;
+}
+
+char *
+_pinfo::cmdline (size_t& n)
+{
+  char *s;
+  if (!this || !pid)
+    return NULL;
+  if (pid != myself->pid)
+    {
+      commune_result cr = commune_send (PICOM_CMDLINE);
+      s = cr.s;
+      n = cr.n;
+    }
+  else
+    {
+      n = 1;
+      for (char **a = __argv; *a; a++)
+	n += strlen (*a);
+      char *p;
+      p = s = (char *) malloc (n);
+      for (char **a = __argv; *a; a++)
+	{
+	  strcpy (p, *a);
+	  p = strchr (p, '\0') + 1;
+	}
+      *p = '\0';
+    }
+  return s;
+}
+
 void
 pinfo::release ()
 {
diff --git a/winsup/cygwin/pinfo.h b/winsup/cygwin/pinfo.h
index dcb814bcc..fe36b5a27 100644
--- a/winsup/cygwin/pinfo.h
+++ b/winsup/cygwin/pinfo.h
@@ -16,7 +16,7 @@ enum
 {
   __SIGFLUSH	    = -2,
   __SIGSTRACE	    = -1,
-  __SIGUNUSED	    =  0,
+  __SIGCOMMUNE	    =  0,
   __SIGOFFSET	    =  2
 };
 
@@ -25,6 +25,17 @@ enum
 #include <sys/resource.h>
 #include "thread.h"
 
+struct commune_result
+{
+  char *s;
+  int n;
+};
+
+enum picom
+{
+  PICOM_CMDLINE = 1
+};
+
 class _pinfo
 {
 public:
@@ -81,6 +92,11 @@ public:
 
   /* Non-zero if process was stopped by a signal. */
   char stopsig;
+  
+  /* commune */
+  pid_t hello_pid;
+  HANDLE tothem;
+  HANDLE fromthem;
 
   void exit (UINT n, bool norecord = 0) __attribute__ ((noreturn, regparm(2)));
 
@@ -119,12 +135,19 @@ public:
   }
 
   inline void setthread2signal (void *thr) {thread2signal = (pthread *) thr;}
+  void commune_recv ();
+  commune_result commune_send (DWORD);
+  bool alive ();
+  char *cmdline (size_t &);
+
+  friend void __stdcall set_myself (pid_t, HANDLE);
 
 private:
   struct sigaction sigs[NSIG];
   sigset_t sig_mask;		/* one set for everything to ignore. */
   LONG _sigtodo[NSIG + __SIGOFFSET];
-  pthread *thread2signal;  // NULL means means thread any other means a pthread
+  pthread *thread2signal;  // NULL means thread any other means a pthread
+  CRITICAL_SECTION lock;
 };
 
 class pinfo
diff --git a/winsup/cygwin/sigproc.cc b/winsup/cygwin/sigproc.cc
index 9fb1fd498..5eeef7f35 100644
--- a/winsup/cygwin/sigproc.cc
+++ b/winsup/cygwin/sigproc.cc
@@ -1014,6 +1014,15 @@ stopped_or_terminated (waitq *parent_w, _pinfo *child)
   return -potential_match;
 }
 
+static void
+talktome ()
+{
+  winpids pids;
+  for (unsigned i = 0; i < pids.npids; i++)
+    if (pids[i]->hello_pid == myself->pid)
+      pids[i]->commune_recv ();
+}
+
 /* Process signals by waiting for a semaphore to become signaled.
  * Then scan an in-memory array representing queued signals.
  * Executes in a separate thread.
@@ -1143,6 +1152,10 @@ wait_sig (VOID *self)
 		  strace.hello ();
 		  break;
 
+		case __SIGCOMMUNE:
+		  talktome ();
+		  break;
+
 		/* A normal UNIX signal */
 		default:
 		  sigproc_printf ("Got signal %d", sig);
diff --git a/winsup/cygwin/string.h b/winsup/cygwin/string.h
index 84dc14cb7..778bb40ac 100644
--- a/winsup/cygwin/string.h
+++ b/winsup/cygwin/string.h
@@ -38,6 +38,70 @@ strchr (const char *s, int c)
   return res;
 }
 
+extern const char isalpha_array[];
+
+#undef strcasematch
+#define strcasematch cygwin_strcasematch
+
+static inline int
+cygwin_strcasematch (const char *cs, const char *ct)
+{
+  register int __res;
+  int d0, d1;
+  __asm__ ("\
+	.global	_isalpha_array			\n\
+	cld					\n\
+	andl	$0xff,%%eax			\n\
+1:	lodsb					\n\
+	scasb					\n\
+	je	2f				\n\
+	xorb	_isalpha_array(%%eax),%%al	\n\
+	cmpb	-1(%%edi),%%al			\n\
+	jne	3f				\n\
+2:	testb	%%al,%%al			\n\
+	jnz	1b				\n\
+	movl	$1,%%eax			\n\
+	jmp	4f				\n\
+3:	xor	%0,%0				\n\
+4:"
+        :"=a" (__res), "=&S" (d0), "=&D" (d1)
+		     : "1" (cs),   "2" (ct));
+
+  return __res;
+}
+
+#undef strncasematch
+#define strncasematch cygwin_strncasematch
+
+static inline int
+cygwin_strncasematch (const char *cs, const char *ct, size_t n)
+{
+  register int __res;
+  int d0, d1, d2;
+  __asm__ ("\
+	.global	_isalpha_array;			\n\
+	cld					\n\
+	andl	$0xff,%%eax			\n\
+1:	decl	%3				\n\
+	js	3f				\n\
+	lodsb					\n\
+	scasb					\n\
+	je	2f				\n\
+	xorb	_isalpha_array(%%eax),%%al	\n\
+	cmpb	-1(%%edi),%%al			\n\
+	jne	4f				\n\
+2:	testb	%%al,%%al			\n\
+	jnz	1b				\n\
+3:	movl	$1,%%eax			\n\
+	jmp	5f				\n\
+4:	xor	%0,%0				\n\
+5:"
+	:"=a" (__res), "=&S" (d0), "=&D" (d1), "=&c" (d2)
+		       :"1" (cs),  "2" (ct), "3" (n));
+
+  return __res;
+}
+
 #ifdef __cplusplus
 }
 #endif