kernel2/signal.c

   1 /*
   2     meinOS - A unix-like x86 microkernel operating system
   3     Copyright (C) 2008  Janosch Gräf <janosch.graef@gmx.net>
   4
   5     This program is free software: you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation, either version 3 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include <signal.h>
  20 #include <procm.h>
  21 #include <syscall.h>
  22 #include <debug.h>
  23 #include <perm.h>
  24
  25 int signal_init() {
  26   if (syscall_create(SYSCALL_SIG_SETUP,signal_setup,1)==-1) return -1;
  27   if (syscall_create(SYSCALL_SIG_SEND,signal_send_syscall,2)==-1) return -1;
  28   return 0;
  29 }
  30
  31 void signal_setup(void (*handler)(int)) {
  32   proc_current->signal = handler;
  33 }
  34
  35 void signal_send(proc_t *proc,int sig) {
  36   if (sig==SIGCONT) proc_wake(proc); // wake process even if it has no signal handler for it
  37   if (proc->signal!=NULL) proc_call(proc,proc->signal,1,sig);
  38 }
  39
  40 void signal_send_syscall(pid_t pid,int sig) {
  41   proc_t *proc = proc_find(pid);
  42   if (proc!=NULL) {
  43     if (proc->uid==proc_current->uid || proc->gid==proc_current->gid || proc_current->uid==PERM_ROOTUID || proc_current->gid==PERM_ROOTGID) signal_send(proc,sig);
  44   }
  45 }