Messages in this thread Patch in this message | | | Date | Tue, 30 Sep 2008 19:49:00 -0000 | From | Thomas Gleixner <> | Subject | [RFC patch 2/3] signals: implement sys_rt_tgsigqueueinfo |
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sys_kill has the per thread counterpart sys_tgkill. sigqueueinfo is missing a thread directed counterpart. Such an interface is important for migrating applications from other OSes which have the per thread delivery implemented.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- kernel/signal.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
Index: linux-2.6-tip/kernel/signal.c =================================================================== --- linux-2.6-tip.orig/kernel/signal.c +++ linux-2.6-tip/kernel/signal.c @@ -2307,6 +2307,27 @@ sys_rt_sigqueueinfo(pid_t pid, int sig, return kill_proc_info(sig, &info, pid); } +asmlinkage long +sys_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig, siginfo_t __user *uinfo) +{ + siginfo_t info; + + /* This is only valid for single tasks */ + if (pid <= 0 || tgid <= 0) + return -EINVAL; + + if (copy_from_user(&info, uinfo, sizeof(siginfo_t))) + return -EFAULT; + + /* Not even root can pretend to send signals from the kernel. + Nor can they impersonate a kill(), which adds source info. */ + if (info.si_code >= 0) + return -EPERM; + info.si_signo = sig; + + return do_send_specific(tgid, pid, sig, &info); +} + int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact) { struct task_struct *t = current;
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