2002-10-23 21:31:10 +04:00
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/* POSIX signals handling routines
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**
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** Copyright 2002, Angelo Mottola, a.mottola@libero.it. All rights reserved.
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2004-09-01 16:05:09 +04:00
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** Copyright 2002-2004, The Haiku Team. All rights reserved.
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2004-03-16 05:53:41 +03:00
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**
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2004-09-01 16:05:09 +04:00
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** Distributed under the terms of the Haiku License.
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2002-10-23 21:31:10 +04:00
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*/
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2004-09-01 16:05:09 +04:00
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2002-10-26 02:36:08 +04:00
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#include <OS.h>
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2002-10-26 20:13:36 +04:00
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#include <KernelExport.h>
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2002-10-23 21:31:10 +04:00
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#include <debug.h>
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#include <thread.h>
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2004-03-16 05:53:41 +03:00
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#include <team.h>
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2002-10-23 21:31:10 +04:00
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#include <int.h>
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#include <sem.h>
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2003-01-27 06:11:45 +03:00
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#include <ksignal.h>
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2002-10-23 21:31:10 +04:00
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#include <syscalls.h>
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2004-01-26 05:01:46 +03:00
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#include <stddef.h>
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#include <string.h>
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2002-10-23 21:31:10 +04:00
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2003-01-27 16:55:57 +03:00
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#define SIGNAL_TO_MASK(signal) (1LL << (signal - 1))
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2002-11-17 07:49:14 +03:00
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const char * const sigstr[NSIG] = {
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2002-10-23 21:31:10 +04:00
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"NONE", "HUP", "INT", "QUIT", "ILL", "CHLD", "ABRT", "PIPE",
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"FPE", "KILL", "STOP", "SEGV", "CONT", "TSTP", "ALRM", "TERM",
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"TTIN", "TTOU", "USR1", "USR2", "WINCH", "KILLTHR", "TRAP"
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};
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2003-01-27 16:55:57 +03:00
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/** Expects interrupts off and thread lock held. */
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2002-10-28 23:38:16 +03:00
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int
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2003-01-27 16:55:57 +03:00
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handle_signals(struct thread *thread, int state)
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2002-10-23 21:31:10 +04:00
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{
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2003-01-27 16:55:57 +03:00
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uint32 signalMask = thread->sig_pending & (~thread->sig_block_mask);
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2002-10-28 23:38:16 +03:00
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int i, sig, global_resched = 0;
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2002-10-23 21:31:10 +04:00
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struct sigaction *handler;
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2003-01-27 16:55:57 +03:00
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if (signalMask == 0)
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return 0;
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for (i = 0; i < NSIG; i++) {
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if (signalMask & 0x1) {
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sig = i + 1;
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handler = &thread->sig_action[i];
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signalMask >>= 1;
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thread->sig_pending &= ~(1L << i);
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dprintf("Thread 0x%lx received signal %s\n", thread->id, sigstr[sig]);
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if (handler->sa_handler == SIG_IGN) {
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// signal is to be ignored
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2004-05-24 13:06:20 +04:00
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// ToDo: apply zombie cleaning on SIGCHLD
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2003-01-27 16:55:57 +03:00
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continue;
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}
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if (handler->sa_handler == SIG_DFL) {
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// default signal behaviour
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switch (sig) {
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case SIGCHLD:
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case SIGWINCH:
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case SIGTSTP:
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case SIGTTIN:
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case SIGTTOU:
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case SIGCONT:
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continue;
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case SIGSTOP:
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thread->next_state = B_THREAD_SUSPENDED;
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global_resched = 1;
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continue;
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case SIGQUIT:
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case SIGILL:
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case SIGTRAP:
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case SIGABRT:
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case SIGFPE:
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case SIGSEGV:
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dprintf("Shutting down thread 0x%lx due to signal #%d\n", thread->id, sig);
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case SIGKILL:
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case SIGKILLTHR:
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default:
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if (!(thread->return_flags & THREAD_RETURN_EXIT))
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thread->return_flags |= THREAD_RETURN_INTERRUPTED;
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RELEASE_THREAD_LOCK();
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restore_interrupts(state);
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2004-05-24 13:06:20 +04:00
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// ToDo: when we have more than a thread per process,
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// it can likely happen (for any thread other than the first)
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// that here, interrupts are still disabled.
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// Changing the above line with "enable_interrupts()" fixes
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// the problem, though we should find its cause.
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// We absolutely need interrupts enabled when we enter
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// thread_exit().
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2003-01-27 16:55:57 +03:00
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thread_exit();
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2002-10-23 21:31:10 +04:00
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}
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2003-01-27 16:55:57 +03:00
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}
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2004-03-16 05:23:32 +03:00
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// ToDo: it's not safe to call arch_setup_signal_frame with
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// interrupts disabled since it writes to the user stack
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// and may page fault.
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2003-01-27 16:55:57 +03:00
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// User defined signal handler
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dprintf("### Setting up custom signal handler frame...\n");
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arch_setup_signal_frame(thread, handler, sig, thread->sig_block_mask);
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if (handler->sa_flags & SA_ONESHOT)
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handler->sa_handler = SIG_DFL;
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if (!(handler->sa_flags & SA_NOMASK))
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2004-09-01 16:05:09 +04:00
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thread->sig_block_mask |= (handler->sa_mask | SIGNAL_TO_MASK(sig)) & BLOCKABLE_SIGS;
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2003-01-27 16:55:57 +03:00
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return global_resched;
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} else
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signalMask >>= 1;
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2002-10-23 21:31:10 +04:00
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}
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2003-01-27 16:55:57 +03:00
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arch_check_syscall_restart(thread);
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2002-10-28 23:38:16 +03:00
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return global_resched;
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2002-10-23 21:31:10 +04:00
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}
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int
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2003-01-27 16:55:57 +03:00
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send_signal_etc(pid_t threadID, uint signal, uint32 flags)
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2002-10-23 21:31:10 +04:00
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{
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2003-01-27 06:11:45 +03:00
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struct thread *thread;
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cpu_status state;
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2003-01-27 16:55:57 +03:00
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if (signal < 1 || signal > MAX_SIGNO)
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2002-10-23 21:31:10 +04:00
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return B_BAD_VALUE;
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2003-01-27 06:11:45 +03:00
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2002-10-23 21:31:10 +04:00
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state = disable_interrupts();
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GRAB_THREAD_LOCK();
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2003-01-27 06:11:45 +03:00
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2003-01-27 16:55:57 +03:00
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thread = thread_get_thread_struct_locked(threadID);
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2003-01-27 06:11:45 +03:00
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if (!thread) {
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2002-10-23 21:31:10 +04:00
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RELEASE_THREAD_LOCK();
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restore_interrupts(state);
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return B_BAD_THREAD_ID;
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}
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// XXX check permission
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2003-01-27 06:11:45 +03:00
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if (thread->team == team_get_kernel_team()) {
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2003-01-27 16:55:57 +03:00
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// Signals to kernel threads will only wake them up
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2003-01-27 06:11:45 +03:00
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if (thread->state == B_THREAD_SUSPENDED) {
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thread->state = thread->next_state = B_THREAD_READY;
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scheduler_enqueue_in_run_queue(thread);
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2002-10-23 21:31:10 +04:00
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}
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2003-01-27 16:55:57 +03:00
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} else {
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thread->sig_pending |= SIGNAL_TO_MASK(signal);
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2003-01-27 06:11:45 +03:00
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2003-01-27 16:55:57 +03:00
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switch (signal) {
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2002-10-23 21:31:10 +04:00
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case SIGKILL:
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2003-01-27 06:11:45 +03:00
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{
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struct thread *mainThread = thread->team->main_thread;
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2002-10-23 21:31:10 +04:00
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// Forward KILLTHR to the main thread of the team
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2003-01-27 06:11:45 +03:00
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2003-01-27 16:55:57 +03:00
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mainThread->sig_pending |= SIGNAL_TO_MASK(SIGKILLTHR);
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2002-10-23 21:31:10 +04:00
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// Wake up main thread
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2003-01-27 06:11:45 +03:00
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if (mainThread->state == B_THREAD_SUSPENDED) {
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mainThread->state = mainThread->next_state = B_THREAD_READY;
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scheduler_enqueue_in_run_queue(mainThread);
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} else if (mainThread->state == B_THREAD_WAITING)
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sem_interrupt_thread(mainThread);
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// Supposed to fall through
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}
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2002-10-23 21:31:10 +04:00
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case SIGKILLTHR:
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// Wake up suspended threads and interrupt waiting ones
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2003-01-27 06:11:45 +03:00
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if (thread->state == B_THREAD_SUSPENDED) {
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thread->state = thread->next_state = B_THREAD_READY;
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scheduler_enqueue_in_run_queue(thread);
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} else if (thread->state == B_THREAD_WAITING)
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sem_interrupt_thread(thread);
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2002-10-23 21:31:10 +04:00
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break;
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case SIGCONT:
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// Wake up thread if it was suspended
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2003-01-27 06:11:45 +03:00
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if (thread->state == B_THREAD_SUSPENDED) {
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thread->state = thread->next_state = B_THREAD_READY;
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scheduler_enqueue_in_run_queue(thread);
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2002-10-23 21:31:10 +04:00
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}
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break;
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default:
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2003-01-27 16:55:57 +03:00
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if (thread->sig_pending & (~thread->sig_block_mask | SIGNAL_TO_MASK(SIGCHLD))) {
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2002-10-23 21:31:10 +04:00
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// Interrupt thread if it was waiting
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2003-01-27 06:11:45 +03:00
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if (thread->state == B_THREAD_WAITING)
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sem_interrupt_thread(thread);
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2002-10-23 21:31:10 +04:00
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}
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break;
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}
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}
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if (!(flags & B_DO_NOT_RESCHEDULE))
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2003-01-27 06:11:45 +03:00
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scheduler_reschedule();
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2002-10-23 21:31:10 +04:00
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RELEASE_THREAD_LOCK();
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restore_interrupts(state);
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2003-01-27 16:55:57 +03:00
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2002-10-23 21:31:10 +04:00
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return B_OK;
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}
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2002-11-18 04:58:00 +03:00
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int
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2003-01-27 16:55:57 +03:00
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send_signal(pid_t threadID, uint signal)
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2002-11-18 04:58:00 +03:00
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{
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2004-03-16 05:23:32 +03:00
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// The BeBook states that this function wouldn't be exported
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// for drivers, but, of course, it's wrong.
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2003-01-27 16:55:57 +03:00
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return send_signal_etc(threadID, signal, 0);
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2002-11-18 04:58:00 +03:00
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}
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2002-10-23 21:31:10 +04:00
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int
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2003-01-27 06:11:45 +03:00
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has_signals_pending(void *_thread)
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2002-10-23 21:31:10 +04:00
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{
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2003-01-27 06:11:45 +03:00
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struct thread *thread = (struct thread *)_thread;
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if (thread == NULL)
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thread = thread_get_current_thread();
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2002-10-23 21:31:10 +04:00
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2003-01-27 06:11:45 +03:00
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return thread->sig_pending & ~thread->sig_block_mask;
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2002-10-23 21:31:10 +04:00
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}
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2004-09-01 16:05:09 +04:00
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int
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sigprocmask(int how, const sigset_t *set, sigset_t *oldSet)
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{
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struct thread *thread = thread_get_current_thread();
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sigset_t oldMask = thread->sig_block_mask;
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// ToDo: "sig_block_mask" is probably not the right thing to change?
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// At least it's often changed at other places...
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switch (how) {
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case SIG_BLOCK:
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atomic_or(&thread->sig_block_mask, *set);
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break;
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case SIG_UNBLOCK:
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atomic_and(&thread->sig_block_mask, ~*set);
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break;
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case SIG_SETMASK:
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atomic_set(&thread->sig_block_mask, *set);
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break;
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default:
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return B_BAD_VALUE;
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}
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if (oldSet != NULL)
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*oldSet = oldMask;
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return B_OK;
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}
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2002-10-23 21:31:10 +04:00
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int
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2003-01-27 16:55:57 +03:00
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sigaction(int signal, const struct sigaction *act, struct sigaction *oact)
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2002-10-23 21:31:10 +04:00
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{
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2003-01-27 16:55:57 +03:00
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struct thread *thread;
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cpu_status state;
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2003-01-27 06:11:45 +03:00
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2003-01-27 16:55:57 +03:00
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if (signal < 1 || signal > MAX_SIGNO
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|| signal == SIGKILL || signal == SIGKILLTHR || signal == SIGSTOP)
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2002-10-23 21:31:10 +04:00
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return EINVAL;
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2003-01-27 06:11:45 +03:00
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2002-10-23 21:31:10 +04:00
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state = disable_interrupts();
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GRAB_THREAD_LOCK();
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2003-01-27 06:11:45 +03:00
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2003-01-27 16:55:57 +03:00
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thread = thread_get_current_thread();
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2003-01-27 06:11:45 +03:00
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if (oact)
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2003-01-27 16:55:57 +03:00
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memcpy(oact, &thread->sig_action[signal - 1], sizeof(struct sigaction));
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2003-01-27 06:11:45 +03:00
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if (act)
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2003-01-27 16:55:57 +03:00
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memcpy(&thread->sig_action[signal - 1], act, sizeof(struct sigaction));
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2003-01-27 06:11:45 +03:00
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if (act && act->sa_handler == SIG_IGN)
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2003-01-27 16:55:57 +03:00
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thread->sig_pending &= ~SIGNAL_TO_MASK(signal);
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2003-01-27 06:11:45 +03:00
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else if (act && act->sa_handler == SIG_DFL) {
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2003-01-27 16:55:57 +03:00
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if (signal == SIGCONT || signal == SIGCHLD || signal == SIGWINCH)
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thread->sig_pending &= ~SIGNAL_TO_MASK(signal);
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2003-01-27 06:11:45 +03:00
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} /*else
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dprintf("### custom signal handler set\n");*/
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2002-10-23 21:31:10 +04:00
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RELEASE_THREAD_LOCK();
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restore_interrupts(state);
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2003-01-27 06:11:45 +03:00
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2002-10-23 21:31:10 +04:00
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return 0;
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}
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2002-10-26 02:36:08 +04:00
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// Triggers a SIGALRM to the thread that issued the timer and reschedules
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2003-01-27 06:11:45 +03:00
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2002-10-26 02:36:08 +04:00
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static int32
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alarm_event(timer *t)
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{
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2004-01-26 05:01:46 +03:00
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// The hook can be called from any context, but we have to
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// deliver the signal to the thread that originally called
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// set_alarm().
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// Since thread->alarm is this timer structure, we can just
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// cast it back - ugly but it works for now
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struct thread *thread = (struct thread *)((uint8 *)t - offsetof(struct thread, alarm));
|
|
|
|
// ToDo: investigate adding one user parameter to the timer structure to fix this hack
|
|
|
|
|
|
|
|
dprintf("alarm_event: thread = %p\n", thread);
|
|
|
|
send_signal_etc(thread->id, SIGALRM, B_DO_NOT_RESCHEDULE);
|
2003-01-27 06:11:45 +03:00
|
|
|
|
2002-10-26 02:36:08 +04:00
|
|
|
return B_INVOKE_SCHEDULER;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bigtime_t
|
2003-01-27 06:11:45 +03:00
|
|
|
set_alarm(bigtime_t time, uint32 mode)
|
2002-10-26 02:36:08 +04:00
|
|
|
{
|
2003-01-27 16:55:57 +03:00
|
|
|
struct thread *thread = thread_get_current_thread();
|
2002-10-26 02:36:08 +04:00
|
|
|
bigtime_t rv = 0;
|
2003-01-27 06:11:45 +03:00
|
|
|
|
2003-01-27 16:55:57 +03:00
|
|
|
ASSERT(B_ONE_SHOT_RELATIVE_ALARM == B_ONE_SHOT_RELATIVE_TIMER);
|
|
|
|
// just to be sure no one changes the headers some day
|
2002-11-17 03:52:43 +03:00
|
|
|
|
2004-01-26 05:01:46 +03:00
|
|
|
dprintf("set_alarm: thread = %p\n", thread);
|
|
|
|
|
2003-01-27 16:55:57 +03:00
|
|
|
if (thread->alarm.period)
|
|
|
|
rv = (bigtime_t)thread->alarm.entry.key - system_time();
|
2003-01-27 06:11:45 +03:00
|
|
|
|
2003-01-27 16:55:57 +03:00
|
|
|
cancel_timer(&thread->alarm);
|
|
|
|
|
|
|
|
if (time != B_INFINITE_TIMEOUT)
|
|
|
|
add_timer(&thread->alarm, &alarm_event, time, mode);
|
2003-01-27 06:11:45 +03:00
|
|
|
|
2002-10-26 02:36:08 +04:00
|
|
|
return rv;
|
|
|
|
}
|
|
|
|
|
2003-01-27 06:11:45 +03:00
|
|
|
|
|
|
|
// #pragma mark -
|
|
|
|
|
|
|
|
|
|
|
|
bigtime_t
|
2004-08-29 00:51:47 +04:00
|
|
|
_user_set_alarm(bigtime_t time, uint32 mode)
|
2003-01-27 06:11:45 +03:00
|
|
|
{
|
|
|
|
return set_alarm(time, mode);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int
|
2004-08-29 00:51:47 +04:00
|
|
|
_user_send_signal(pid_t team, uint signal)
|
2003-01-27 06:11:45 +03:00
|
|
|
{
|
|
|
|
return send_signal(team, signal);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2004-09-01 16:05:09 +04:00
|
|
|
int
|
|
|
|
_user_sigprocmask(int how, const sigset_t *userSet, sigset_t *userOldSet)
|
|
|
|
{
|
|
|
|
sigset_t set, oldSet;
|
|
|
|
status_t status;
|
|
|
|
|
|
|
|
if (userSet == NULL)
|
|
|
|
return B_BAD_VALUE;
|
|
|
|
|
|
|
|
if (user_memcpy(&set, userSet, sizeof(sigset_t)) < B_OK
|
|
|
|
|| (userOldSet != NULL && user_memcpy(&oldSet, userOldSet, sizeof(sigset_t)) < B_OK))
|
|
|
|
return B_BAD_ADDRESS;
|
|
|
|
|
|
|
|
status = sigprocmask(how, &set, userOldSet ? &oldSet : NULL);
|
|
|
|
|
|
|
|
// copy old set if asked for
|
|
|
|
if (status >= B_OK && userOldSet != NULL && user_memcpy(userOldSet, &oldSet, sizeof(sigset_t)) < B_OK)
|
|
|
|
return B_BAD_ADDRESS;
|
|
|
|
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2003-01-27 06:11:45 +03:00
|
|
|
int
|
2004-08-29 00:51:47 +04:00
|
|
|
_user_sigaction(int sig, const struct sigaction *userAction, struct sigaction *userOldAction)
|
2003-01-27 06:11:45 +03:00
|
|
|
{
|
|
|
|
struct sigaction act, oact;
|
2004-09-01 16:05:09 +04:00
|
|
|
status_t status;
|
2003-01-27 06:11:45 +03:00
|
|
|
|
|
|
|
if ((userAction != NULL && user_memcpy(&act, userAction, sizeof(struct sigaction)) < B_OK)
|
|
|
|
|| (userOldAction != NULL && user_memcpy(&oact, userOldAction, sizeof(struct sigaction)) < B_OK))
|
|
|
|
return B_BAD_ADDRESS;
|
|
|
|
|
2004-09-01 16:05:09 +04:00
|
|
|
status = sigaction(sig, userAction ? &act : NULL, userOldAction ? &oact : NULL);
|
2003-01-27 06:11:45 +03:00
|
|
|
|
|
|
|
// only copy the old action if a pointer has been given
|
2004-09-01 16:05:09 +04:00
|
|
|
if (status >= B_OK && userOldAction != NULL
|
2003-01-27 06:11:45 +03:00
|
|
|
&& user_memcpy(userOldAction, &oact, sizeof(struct sigaction)) < B_OK)
|
|
|
|
return B_BAD_ADDRESS;
|
|
|
|
|
2004-09-01 16:05:09 +04:00
|
|
|
return status;
|
2003-01-27 06:11:45 +03:00
|
|
|
}
|
|
|
|
|