* 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.

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