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This are updated versions of the patch Ingo sent some time ago to
implement a new tgkill() syscall which can in theory replace kill() and
tkill().

The first patch is just Ingo's patch, relative to the current BK
sources, plus the fix to send the correct si_pid value.

The second patch implementation the additional functionality Linus
proposed.  They allow using tgkill as a replacement for kill/tkill by
recognizing special -1 values.  This is the interdiff:

- --- linux-2.5/kernel/signal.c   2003-07-07 12:39:36.000000000 -0700
+++ linux-2.5/kernel/signal.c   2003-07-07 13:03:15.000000000 -0700
@@ -2104,8 +2104,12 @@
        int error;
        struct task_struct *p;

+       /* Handle tgkill(tgid, -1, sig) like kill(tgid, sig).  */
+       if (pid == -1)
+               return sys_kill(tgid, sig);
+
        /* This is only valid for single tasks */
- -       if (pid <= 0 || tgid <= 0)
+       if (pid <= 0 || tgid < -1 || tgid == 0)
                return -EINVAL;

        info.si_signo = sig;
@@ -2117,7 +2121,8 @@
        read_lock(&tasklist_lock);
        p = find_task_by_pid(pid);
        error = -ESRCH;
- -       if (p && (p->tgid == tgid)) {
+       /* Handle tgkill(-1, pid, sig) like tkill(pid, sig).  */
+       if (p && (p->tgid == tgid || tgid == -1)) {
                error = check_kill_permission(sig, &info, p);
                /*
                 * The null signal is a permissions and process existence


I personally would think that this addition is overkill since we cannot
get rid of the kill/tkill syscalls anyway.

I've tested both patches.  Having one of them included is really needed
since many/most people still run with limited PID ranges (maybe due to
legacy apps breaking) and the PID reuse can cause problems.

Let me know if there are any problems.  I'll try to address them right away.

- --
- --------------.                        ,-.            444 Castro Street
Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
Red Hat         `--' drepper at redhat.com `---------------------------
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