From 3fbdb3c21524d9d95278ada1d61b4d1e6bee654b Mon Sep 17 00:00:00 2001 From: davidxu Date: Fri, 14 Oct 2005 12:43:47 +0000 Subject: 1. Change prototype of trapsignal and sendsig to use ksiginfo_t *, most changes in MD code are trivial, before this change, trapsignal and sendsig use discrete parameters, now they uses member fields of ksiginfo_t structure. For sendsig, this change allows us to pass POSIX realtime signal value to user code. 2. Remove cpu_thread_siginfo, it is no longer needed because we now always generate ksiginfo_t data and feed it to libpthread. 3. Add p_sigqueue to proc structure to hold shared signals which were blocked by all threads in the proc. 4. Add td_sigqueue to thread structure to hold all signals delivered to thread. 5. i386 and amd64 now return POSIX standard si_code, other arches will be fixed. 6. In this sigqueue implementation, pending signal set is kept as before, an extra siginfo list holds additional siginfo_t data for signals. kernel code uses psignal() still behavior as before, it won't be failed even under memory pressure, only exception is when deleting a signal, we should call sigqueue_delete to remove signal from sigqueue but not SIGDELSET. Current there is no kernel code will deliver a signal with additional data, so kernel should be as stable as before, a ksiginfo can carry more information, for example, allow signal to be delivered but throw away siginfo data if memory is not enough. SIGKILL and SIGSTOP have fast path in sigqueue_add, because they can not be caught or masked. The sigqueue() syscall allows user code to queue a signal to target process, if resource is unavailable, EAGAIN will be returned as specification said. Just before thread exits, signal queue memory will be freed by sigqueue_flush. Current, all signals are allowed to be queued, not only realtime signals. Earlier patch reviewed by: jhb, deischen Tested on: i386, amd64 --- sys/kern/subr_trap.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'sys/kern/subr_trap.c') diff --git a/sys/kern/subr_trap.c b/sys/kern/subr_trap.c index 4574aad..c305dc0 100644 --- a/sys/kern/subr_trap.c +++ b/sys/kern/subr_trap.c @@ -155,6 +155,7 @@ ast(struct trapframe *framep) int sig; #if defined(DEV_NPX) && !defined(SMP) int ucode; + ksiginfo_t ksi; #endif td = curthread; @@ -217,7 +218,10 @@ ast(struct trapframe *framep) PCB_NPXTRAP); ucode = npxtrap(); if (ucode != -1) { - trapsignal(td, SIGFPE, ucode); + ksiginfo_init_trap(&ksi); + ksi.ksi_signo = SIGFPE; + ksi.ksi_code = ucode; + trapsignal(td, &ksi); } } #endif -- cgit v1.1