libc/sysdeps/linux/common/sigprocmask.c

   1 /*
   2  * sigprocmask() for uClibc
   3  *
   4  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
   5  *
   6  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   7  */
   8
   9 #include <sys/syscall.h>
  10
  11 #if defined __USE_POSIX
  12 #include <signal.h>
  13 #ifdef __UCLIBC_HAS_THREADS_NATIVE__
  14 # include <pthreadP.h>  /* SIGCANCEL */
  15 #endif
  16
  17 #undef sigprocmask
  18
  19 libc_hidden_proto(sigprocmask)
  20
  21 #ifdef __NR_rt_sigprocmask
  22
  23 # define __NR___rt_sigprocmask __NR_rt_sigprocmask
  24 static __always_inline
  25 _syscall4(int, __rt_sigprocmask, int, how, const sigset_t *, set,
  26                   sigset_t *, oldset, size_t, size)
  27
  28 int sigprocmask(int how, const sigset_t * set, sigset_t * oldset)
  29 {
  30 #ifdef SIGCANCEL
  31         sigset_t local_newmask;
  32
  33         /*
  34          * The only thing we have to make sure here is that SIGCANCEL and
  35          * SIGSETXID are not blocked.
  36          */
  37         if (set != NULL && (unlikely (__sigismember (set, SIGCANCEL))
  38 # ifdef SIGSETXID
  39                 || unlikely (__sigismember (set, SIGSETXID))
  40 # endif
  41                 ))
  42         {
  43                 local_newmask = *set;
  44                 __sigdelset (&local_newmask, SIGCANCEL);
  45 # ifdef SIGSETXID
  46                 __sigdelset (&local_newmask, SIGSETXID);
  47 # endif
  48                 set = &local_newmask;
  49         }
  50 #endif
  51
  52         return __rt_sigprocmask(how, set, oldset, __SYSCALL_SIGSET_T_SIZE);
  53 }
  54
  55
  56 #else
  57
  58 # define __NR___syscall_sigprocmask __NR_sigprocmask
  59 static __always_inline
  60 _syscall3(int, __syscall_sigprocmask, int, how, const sigset_t *, set,
  61                   sigset_t *, oldset)
  62
  63 int sigprocmask(int how, const sigset_t * set, sigset_t * oldset)
  64 {
  65 #ifdef SIGCANCEL
  66         sigset_t local_newmask;
  67
  68         /*
  69          * The only thing we have to make sure here is that SIGCANCEL and
  70          * SIGSETXID are not blocked.
  71          */
  72         if (set != NULL && (unlikely (__sigismember (set, SIGCANCEL))
  73 # ifdef SIGSETXID
  74                 || unlikely (__sigismember (set, SIGSETXID))
  75 # endif
  76                 ))
  77         {
  78                 local_newmask = *set;
  79                 __sigdelset (&local_newmask, SIGCANCEL);
  80 # ifdef SIGSETXID
  81                 __sigdelset (&local_newmask, SIGSETXID);
  82 # endif
  83                 set = &local_newmask;
  84         }
  85 #endif
  86
  87         return (__syscall_sigprocmask(how, set, oldset));
  88 }
  89 #endif
  90 libc_hidden_def(sigprocmask)
  91 #endif