root/kernel/syscalls/sigprocmask.c

/* */

DEFINITIONS

1. sys_sigprocmask

   1 /*
   2  * fiwix/kernel/syscalls/sigprocmask.c
   3  *
   4  * Copyright 2018, Jordi Sanfeliu. All rights reserved.
   5  * Distributed under the terms of the Fiwix License.
   6  */
   7 
   8 #include <fiwix/fs.h>
   9 #include <fiwix/signal.h>
  10 #include <fiwix/process.h>
  11 #include <fiwix/errno.h>
  12 
  13 #ifdef __DEBUG__
  14 #include <fiwix/stdio.h>
  15 #endif /*__DEBUG__ */
  16 
  17 int sys_sigprocmask(int how, const __sigset_t *set, __sigset_t *oldset)
  18 {
  19         int errno;
  20 
  21 #ifdef __DEBUG__
  22         printk("(pid %d) sys_sigprocmask(%d, 0x%08x, 0x%08x)\n", current->pid, how, set, oldset);
  23 #endif /*__DEBUG__ */
  24 
  25         if(oldset) {
  26                 if((errno = check_user_area(VERIFY_WRITE, oldset, sizeof(__sigset_t)))) {
  27                         return errno;
  28                 }
  29                 *oldset = current->sigblocked;
  30         }
  31 
  32         if(set) {
  33                 if((errno = check_user_area(VERIFY_READ, set, sizeof(__sigset_t)))) {
  34                         return errno;
  35                 }
  36                 switch(how) {
  37                         case SIG_BLOCK:
  38                                 current->sigblocked |= (*set & SIG_BLOCKABLE);
  39                                 break;
  40                         case SIG_UNBLOCK:
  41                                 current->sigblocked &= ~(*set & SIG_BLOCKABLE);
  42                                 break;
  43                         case SIG_SETMASK:
  44                                 current->sigblocked = (*set & SIG_BLOCKABLE);
  45                                 break;
  46                         default:
  47                                 return -EINVAL;
  48                 }
  49         }
  50         return 0;
  51 }

/* */