root / prex-0.9.0 / usr / server / proc / proc_sig.c @ 03e9c04a
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/*
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* Copyright (c) 2005-2006, Kohsuke Ohtani
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* proc_sig.c - signal transfer.
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*/
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#include <sys/prex.h> |
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#include <sys/capability.h> |
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#include <ipc/proc.h> |
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#include <sys/list.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include "proc.h" |
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/*
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* Check if current process has CAP_KILL capability.
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*/
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static int |
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kill_capable(void)
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{ |
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if (task_chkcap(curproc->p_task, CAP_KILL) == 0) |
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return 1; |
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return 0; |
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} |
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/*
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* Send a signal to the process.
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*/
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static int |
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sendsig(struct proc *p, int sig) |
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{ |
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/*
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* We never allow to send signal to the
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* process server in any case.
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*/
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if (p->p_pid == 0) |
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return EPERM;
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/*
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* Filter signals for init process.
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* This is for fail safe...
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*/
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if (p->p_pid == 1 && sig != SIGCHLD) |
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return EPERM;
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DPRINTF(("proc: sendsig task=%x\n", p->p_task));
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return exception_raise(p->p_task, sig);
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} |
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/*
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* Send a signal to one process.
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*/
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static int |
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kill_one(pid_t pid, int sig)
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{ |
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struct proc *p;
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DPRINTF(("proc: killone pid=%d sig=%d\n", pid, sig));
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if ((p = p_find(pid)) == NULL) |
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return ESRCH;
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return sendsig(p, sig);
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} |
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/*
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* Send a signal to all process in the process group.
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*/
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int
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kill_pg(pid_t pgid, int sig)
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{ |
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struct proc *p;
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struct pgrp *pgrp;
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list_t head, n; |
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int error = 0; |
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DPRINTF(("proc: killpg pgid=%d sig=%d\n", pgid, sig));
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if ((pgrp = pg_find(pgid)) == NULL) |
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return ESRCH;
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head = &pgrp->pg_members; |
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for (n = list_first(head); n != head; n = list_next(n)) {
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p = list_entry(n, struct proc, p_pgrp_link);
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if ((error = sendsig(p, sig)) != 0) |
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break;
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} |
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return error;
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} |
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/*
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* Send a signal.
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*
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* The behavior is different for the pid value.
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*
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* if (pid > 0)
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* Send a signal to specific process.
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*
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* if (pid == 0)
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* Send a signal to all processes in same process group.
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*
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* if (pid == -1)
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* Send a signal to all processes except init.
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*
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* if (pid < -1)
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* Send a signal to the process group.
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*
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* Note: Need CAP_KILL capability to send a signal to the different
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* process/group.
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*/
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int
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sys_kill(pid_t pid, int sig)
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{ |
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struct proc *p;
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list_t n; |
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int error = 0; |
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DPRINTF(("proc: kill pid=%d sig=%d\n", pid, sig));
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switch (sig) {
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case SIGFPE:
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case SIGILL:
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case SIGSEGV:
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return EINVAL;
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} |
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if (pid > 0) { |
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if (pid != curproc->p_pid && !kill_capable()) {
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DPRINTF(("proc: EPERM\n"));
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return EPERM;
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} |
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error = kill_one(pid, sig); |
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} |
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else if (pid == -1) { |
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DPRINTF(("proc: kill? curproc=%x\n", curproc));
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if (!kill_capable())
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return EPERM;
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DPRINTF(("proc: kill all!\n"));
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for (n = list_first(&allproc); n != &allproc;
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n = list_next(n)) { |
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p = list_entry(n, struct proc, p_link);
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/*
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* We don't send a signal to the following processes.
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*
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* pid=0 - process server
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* pid=1 - init process
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* curproc - current process (sleeping in msg_send)
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*/
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if (p->p_pid != 0 && p->p_pid != 1 && |
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p->p_pid != curproc->p_pid) |
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{ |
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error = kill_one(p->p_pid, sig); |
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if (error != 0) |
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break;
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} |
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} |
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} |
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else if (pid == 0) { |
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error = kill_pg(curproc->p_pgrp->pg_pgid, sig); |
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} |
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else { /* pid < -1 */ |
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if (curproc->p_pgrp->pg_pgid != -pid && !kill_capable())
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return EPERM;
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error = kill_pg(-pid, sig); |
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} |
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return error;
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} |