2003-01-08 Roland McGrath <roland@redhat.com>

Support for new Linux 2.5 thread features.
	* defs.h [LINUX]: Define __NR_exit_group if not defined.
	(struct tcb): New members nclone_threads, nclone_detached,
	and nclone_waiting.
	(TCB_CLONE_DETACHED, TCB_CLONE_THREAD, TCB_GROUP_EXITING): New macros.
	(waiting_parent): Macro removed.
	(pid2tcb): Declare it.
	* process.c (internal_clone) [TCB_CLONE_THREAD]: Reparent the new
	child to our parent if we are a CLONE_THREAD child ourselves.
	Maintain TCB_CLONE_THREAD and TCB_CLONE_DETACHED flags and counts.
	(internal_wait) [TCB_CLONE_THREAD]: Factor out detached children when
	determining if we have any.  If TCB_CLONE_THREAD is set, check
	parent's children instead of our own, and bump nclone_waiting count.
	(internal_exit) [__NR_exit_group]: Set the TCB_GROUP_EXITING flag if
	the syscall was exit_group.
	* syscall.c (internal_syscall): Use internal_exit for exit_group.
	* strace.c (pid2tcb): No longer static.
	(alloctcb) [TCB_CLONE_THREAD]: Initialize new fields.
	(droptcb) [TCB_CLONE_THREAD]: Maintain new fields.
	If we have thread children, set TCB_EXITING and don't clear the TCB.
	(resume) [TCB_CLONE_THREAD]: Decrement parent's nclone_waiting.
	(detach) [TCB_CLONE_THREAD]: When calling resume, check all thread
	children of our parent that might be waiting for us too.
	[TCB_GROUP_EXITING] (handle_group_exit): New function.
	(trace) [TCB_GROUP_EXITING]: Use that in place of detach or droptcb.

defs.h

@@ -261,6 +261,11 @@ struct tcb {
 	struct tcb *parent;	/* Parent of this process */
 	int nchildren;		/* # of traced children */
 	int waitpid;		/* pid(s) this process is waiting for */
+#ifdef LINUX
+	int nclone_threads;	/* # of nchildren with CLONE_THREAD */
+	int nclone_detached;	/* # of nchildren with CLONE_DETACHED */
+	int nclone_waiting;	/* clone threads in wait4 (TCB_SUSPENDED) */
+#endif
 				/* (1st arg of wait4()) */
 	long baddr;		/* `Breakpoint' address */
 	long inst[2];		/* Instructions on above */
@@ -297,6 +302,26 @@ struct tcb {
 # if defined(ALPHA) || defined(SPARC) || defined(POWERPC) || defined(IA64) || defined(HPPA) || defined(SH)
 #  define TCB_WAITEXECVE 02000	/* ignore SIGTRAP after exceve */
 # endif
+# define TCB_CLONE_DETACHED 04000 /* CLONE_DETACHED set in creating syscall */
+# define TCB_CLONE_THREAD  010000 /* CLONE_THREAD set in creating syscall */
+# define TCB_GROUP_EXITING 020000 /* TCB_EXITING was exit_group, not _exit */
+# include <sys/syscall.h>
+# ifndef __NR_exit_group
+# /* Hack: Most headers around are too old to have __NR_exit_group.  */
+#  ifdef ALPHA
+#   define __NR_exit_group 405
+#  elif defined I386
+#   define __NR_exit_group 252
+#  elif defined IA64
+#   define __NR_exit_group 1236
+#  elif defined POWERPC
+#   define __NR_exit_group 234
+#  elif defined S390 || defined S390X
+#   define __NR_exit_group 248
+#  elif defined SPARC
+#   define __NR_exit_group 188
+#  endif /* ALPHA et al */
+# endif	/* !__NR_exit_group */
 #endif /* LINUX */
 
 /* qualifier flags */
@@ -314,10 +339,6 @@ struct tcb {
 #define syserror(tcp)	((tcp)->u_error != 0)
 #define verbose(tcp)	(qual_flags[(tcp)->scno] & QUAL_VERBOSE)
 #define abbrev(tcp)	(qual_flags[(tcp)->scno] & QUAL_ABBREV)
-#define waiting_parent(tcp) \
-		(tcp->parent && \
-		(tcp->parent->flags & TCB_SUSPENDED) && \
-		(tcp->parent->waitpid <= 0 || tcp->parent->waitpid == tcp->pid))
 
 struct xlat {
 	int val;
@@ -371,6 +392,7 @@ extern struct tcb *tcp_last;
 extern int set_personality P((int personality));
 extern char *xlookup P((struct xlat *, int));
 extern struct tcb *alloctcb P((int));
+extern struct tcb *pid2tcb P((int));
 extern void droptcb P((struct tcb *));
 
 extern void set_sortby P((char *));

syscall.c

@@ -669,6 +669,9 @@ struct tcb *tcp;
 #endif
 #ifdef SYS32_exit
 	case SYS32_exit:
+#endif
+#ifdef __NR_exit_group
+	case __NR_exit_group:
 #endif
 		internal_exit(tcp);
 		break;