Sat May 4 05:44:25 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>

	* hurd/hurd-raise.c (_hurd_raise_signal): Pass sigcode in msg_sig_post
	rpc.

	* hurd/hurdmsg.c (_S_msg_set_environment): Use argz.h functions
	instead of _hurd_split_args.
	(_S_msg_*_exec_flags): Functions removed.
	(_S_msg_startup_dosync): Stub removed.

Sat May  4 02:11:55 1996  Roland McGrath  <roland@delasyd.gnu.ai.mit.edu>

	* sysdeps/mach/hurd/ptrace.c: Set _hurdsig_traced instead of
	EXEC_TRACED bit in _hurd_exec_flags.
	Pass sigcode arg in msg_sig_post_untraced rpc.

	* sysdeps/mach/hurd/access.c: Don't pass io port in
	auth_user_authenticate rpc.

	* posix/sched.h: Fix typos.

	* sysdeps/mach/hurd/fork.c: Use new critical section lock.
	Clear _hurdsig_traced instead of EXEC_TRACED.

	* sysdeps/stub/nanosleep.c (nanosleep): Fix typo.

	* wcsmbs/wcstol.c: Find strtol.c in ../stdlib.
	* wcsmbs/wcstof.c: Find strtod.c in ../stdlib.
	* wcsmbs/wcstod.c: Likewise.
	* wcsmbs/wcstold.c: Likewise.

	* wcsmbs/wcwidth.h: Find cname-lookup.h in ../wctype.

	* string/envz.c (envz_entry): Use const.
	(envz_get, envz_remove): Likewise.
	(envz_entry): Return char *, not const char *.

	* string/envz.h: Fix decl.

	* string/argz-create.c: Use const in prototype.
	* string/argz-next.c: Likewise.

	* sysdeps/mach/hurd/sigprocmask.c: Pass sigcode arg to msg_sig_post.
	* sysdeps/mach/hurd/i386/sigreturn.c: Likewise.
	* sysdeps/mach/hurd/sigsuspend.c: Likewise.
	* sysdeps/mach/hurd/kill.c: Likewise.

	* hurd/hurdexec.c (_hurd_exec): Use new critical section lock.
	* hurd/catch-exc.c (_S_catch_exception_raise): Likewise.
	* hurd/sigunwind.c (_hurdsig_longjmp_from_handler): Likewise.
	* hurd/thread-cancel.c (hurd_thread_cancel, hurd_check_cancel):
	Likewise.
	* sysdeps/mach/hurd/jmp-unwind.c (_longjmp_unwind): Likewise.
	* sysdeps/mach/hurd/sigaction.c: Likewise.

	* sysdeps/mach/hurd/errnos.awk: Don't use ARGV in comment; it can
	change meaninglessly.

	* hurd/hurd/signal.h (struct hurd_sigstate): Replace critical section
 	flag with a spin lock.
	(_hurd_critical_section_lock): Use spin_try_lock on that to see if we
 	get it.  No need to take SS->lock at all.
	(_hurd_critical_section_unlock): Unlock SS->critical_section_lock
	instead of clearing the old flag member.
	* hurd/hurdsig.c (_hurd_internal_post_signal): Use spin_lock_locked to
	test the critical section state.

	* hurd/hurdinit.c (_hurd_init): Set _hurdsig_traced from the intarray.

	* hurd/hurdkill.c (_hurd_sig_post): Pass 0 sigcode in msg_sig_post.

	* hurd/hurdsig.c (_hurd_internal_post_signal): Test _hurdsig_traced
 	instead of testing (_hurd_exec_flags & EXEC_TRACED).
	(_S_msg_sig_post): Take sigcode arg and pass it through.
	(_S_msg_sig_post_untraced): Likewise.
	(reauth_proc): Don't pass proc port in auth_user_authenticate.

	* hurd/setauth.c (_hurd_setauth): Don't pass object ports in
	auth_user_authenticate RPCs, just the one-off rendezvous port.
	* hurd/dtable.c (reauth_dtable): Likewise.
	* hurd/hurdlookup.c (__hurd_file_name_lookup_retry): Likewise.

	* hurd/hurdexec.c (_hurd_exec): Pass 0 flags to file_exec.
	Pass sigcode arg to msg_sig_post.

	* string/argz.h (argz_create): Use const in prototype.

	* hurd/hurdinit.c (_hurd_proc_init): Test _hurdsig_traced instead of
	testing (_hurd_exec_flags & EXEC_TRACED).
	Pass sigcode arg to msg_sig_post.

	* hurd/hurd.h: Declare _hurdsig_traced.

	* string/argz.h (__argz_next): Cast ENTRY before returning it.

	* hurd/hurd/signal.h (_hurd_critical_section_unlock): Pass sigcode arg
	to msg_sig_post.

	* hurd/path-lookup.c: New file.
	* hurd/Makefile (routines): Add path-lookup.
	* hurd/hurd/lookup.h: Declare file_name_path_scan,
	hurd_file_name_path_lookup.
	* hurd/hurd.h: Declare file_name_path_lookup.

	* sysdeps/mach/hurd/select.c: The io_select rpc no longer has a TAG_ID
	argument.  Instead, use a separate reply port for each RPC and put them
	all in a port set to wait for slow replies.

2 files changed, 46 insertions, 23 deletions

diff --git a/hurd/hurd/lookup.h b/hurd/hurd/lookup.h
index 6911b8f5b9..565ab317c8 100644
--- a/hurd/hurd/lookup.h
+++ b/hurd/hurd/lookup.h
@@ -1,5 +1,5 @@
 /* Declarations of file name translation functions for the GNU Hurd.
-Copyright (C) 1995 Free Software Foundation, Inc.
+Copyright (C) 1995, 1996 Free Software Foundation, Inc.
 This file is part of the GNU C Library.
 
 The GNU C Library is free software; you can redistribute it and/or
@@ -98,4 +98,33 @@ error_t hurd_file_name_lookup_retry (error_t (*use_init_port)
 				     file_t *result);
 
 
+/* If FILE_NAME contains a '/', or PATH is NULL, call FUN with FILE_NAME, and
+   return the result (if PREFIXED_NAME is non-NULL, setting *PREFIXED_NAME to
+   NULL).  Otherwise, call FUN repeatedly with FILE_NAME prefixed with each
+   successive `:' separated element of PATH, returning whenever FUN returns
+   0 (if PREFIXED_NAME is non-NULL, setting *PREFIXED_NAME to the resulting
+   prefixed path).  If FUN never returns 0, return the first non-ENOENT
+   return value, or ENOENT if there is none.  */
+error_t file_name_path_scan (const char *file_name, const char *path,
+			     error_t (*fun)(const char *name),
+			     char **prefixed_name);
+
+/* Lookup FILE_NAME and return the node opened with FLAGS & MODE in result
+   (see hurd_file_name_lookup for details), but a simple filename (without
+   any directory prefixes) will be consectutively prefixed with the pathnames
+   in the `:' separated list PATH until one succeeds in a successful lookup.
+   If none succeed, then the first error that wasn't ENOENT is returned, or
+   ENOENT if no other errors were returned.  If PREFIXED_NAME is non-NULL,
+   then if RESULT is looked up directly, *PREFIXED_NAME is set to NULL, and
+   if it is looked up using a prefix from PATH, *PREFIXED_NAME is set to
+   malloced storage containing the prefixed name.  */
+error_t hurd_file_name_path_lookup (error_t (*use_init_port)
+				    (int which,
+				     error_t (*operate) (mach_port_t)),
+				    file_t (*get_dtable_port) (int fd),
+				    const char *file_name, const char *path,
+				    int flags, mode_t mode,
+				    file_t *result, char **prefixed_name);
+
+
 #endif	/* hurd/lookup.h */
diff --git a/hurd/hurd/signal.h b/hurd/hurd/signal.h
index 1973bcdb3c..fdaafdf459 100644
--- a/hurd/hurd/signal.h
+++ b/hurd/hurd/signal.h
@@ -47,9 +47,9 @@ struct hurd_signal_preempter;	/* <hurd/sigpreempt.h> */
 
 struct hurd_sigstate
   {
-    spin_lock_t lock;		/* Locks most of the rest of the structure.  */
+    spin_lock_t critical_section_lock; /* Held if in critical section.  */
 
-    int critical_section;	/* Nonzero if in critical section.  */
+    spin_lock_t lock;		/* Locks most of the rest of the structure.  */
 
     thread_t thread;
     struct hurd_sigstate *next; /* Linked-list of thread sigstates.  */
@@ -159,27 +159,22 @@ _hurd_critical_section_lock (void)
     (void *) __hurd_threadvar_location (_HURD_THREADVAR_SIGSTATE);
   struct hurd_sigstate *ss = *location;
   if (ss == NULL)
-    /* The thread variable is unset; this must be the first time we've
-       asked for it.  In this case, the critical section flag cannot
-       possible already be set.  Look up our sigstate structure the slow
-       way; this locks the sigstate lock.  */
-    ss = *location = _hurd_thread_sigstate (__mach_thread_self ());
-  else
-    __spin_lock (&ss->lock);
-
-  if (ss->critical_section)
     {
-      /* We are already in a critical section, so do nothing.  */
+      /* The thread variable is unset; this must be the first time we've
+	 asked for it.  In this case, the critical section flag cannot
+	 possible already be set.  Look up our sigstate structure the slow
+	 way; this locks the sigstate lock.  */
+      ss = *location = _hurd_thread_sigstate (__mach_thread_self ());
       __spin_unlock (&ss->lock);
-      return NULL;
     }
 
-  /* Set the critical section flag so no signal handler will run.  */
-  ss->critical_section = 1;
-  __spin_unlock (&ss->lock);
+  if (! __spin_try_lock (&ss->critical_section_lock))
+    /* We are already in a critical section, so do nothing.  */
+    return NULL;
 
-  /* Return our sigstate pointer; this will be passed to
-     _hurd_critical_section_unlock to clear the critical section flag. */
+  /* With the critical section lock held no signal handler will run.
+     Return our sigstate pointer; this will be passed to
+     _hurd_critical_section_unlock to unlock it.  */
   return ss;
 }
 
@@ -191,19 +186,18 @@ _hurd_critical_section_unlock (void *our_lock)
     return;
   else
     {
-      /* It was us who acquired the critical section lock.  Clear the
-	 critical section flag.  */
+      /* It was us who acquired the critical section lock.  Unlock it.  */
       struct hurd_sigstate *ss = our_lock;
       sigset_t pending;
       __spin_lock (&ss->lock);
-      ss->critical_section = 0;
+      __spin_unlock (&ss->critical_section_lock);
       pending = ss->pending & ~ss->blocked;
       __spin_unlock (&ss->lock);
       if (pending)
 	/* There are unblocked signals pending, which weren't
 	   delivered because we were in the critical section.
 	   Tell the signal thread to deliver them now.  */
-	__msg_sig_post (_hurd_msgport, 0, __mach_task_self ());
+	__msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
     }
 }