Bug#338182: kfreebsd-5: signals for linuxthreads internal operation

[Petr Salinger]

Package:  kfreebsd-5  
Severity: wishlist
Tags: patch

Hi,

with attached patch for kernel and clone.c it should be possible leave 
SIGUSR1 and SIGUSR2 free for user code.

Current libc will work with current and new kernel, 
new libc will require new kernel.

Petr

--- clone.c.OLD 2005-11-08 17:25:02.000000000 +0100
+++ clone.c     2005-11-08 17:32:18.000000000 +0100
@@ -64,13 +64,13 @@
 
   if ((flags & CSIGNAL) != 0 && (flags & CSIGNAL) != SIGCHLD)
     {
-      /* This implementation of clone() supports only the SIGUSR1 signal.  */
-      if ((flags & CSIGNAL) != SIGUSR1)
+      /* This implementation of clone() supports only the 128 signals.  */
+      if ((flags & CSIGNAL) & RFTHPNMASK)
        {
          __set_errno (EINVAL);
          return -1;
        }
-      rfork_flags |= RFLINUXTHPN;
+      rfork_flags |= (RFLINUXTHPN | ((flags & CSIGNAL) <<  RFTHPNSHIFT));
     }
 
   if (flags & CLONE_VM)



diff -ur sys.old/kern/kern_fork.c sys/kern/kern_fork.c
--- sys.old/kern/kern_fork.c    2005-04-27 13:32:23.000000000 +0200
+++ sys/kern/kern_fork.c        2005-11-08 17:17:43.000000000 +0100
@@ -502,7 +502,11 @@
                p2->p_sigacts = newsigacts;
        }
        if (flags & RFLINUXTHPN) 
-               p2->p_sigparent = SIGUSR1;
+       {
+               int sig;
+               sig = RFTHPNSIGNUM(flags);
+               p2->p_sigparent = sig ? sig : SIGUSR1;
+       }
        else
                p2->p_sigparent = SIGCHLD;
 
diff -ur sys.old/sys/unistd.h sys/sys/unistd.h
--- sys.old/sys/unistd.h        2005-02-01 00:26:57.000000000 +0100
+++ sys/sys/unistd.h    2005-11-08 17:14:12.000000000 +0100
@@ -173,6 +173,10 @@
 #define        RFHIGHPID       (1<<18) /* use a pid higher then 10 (idleproc) 
*/
 #define        RFPPWAIT        (1<<31) /* parent sleeps until child exits 
(vfork) */
 #define        RFKERNELONLY    (RFSTOPPED | RFHIGHPID | RFPPWAIT)
+#define RFTHPNSHIFT    24      /* reserve bits 24-30 */
+#define RFTHPNMASK     0x7F    /* for compatibility with linuxthreads/clone()  
 */
+                               /* allow to specify  "clone exit parent 
notification" signal */
+#define RFTHPNSIGNUM(flags)    (((flags) >> RFTHPNSHIFT) & RFTHPNMASK)
 
 #endif /* __BSD_VISIBLE */