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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 #ifndef _SIGNAL_H_
     29 #define _SIGNAL_H_
     30 
     31 #include <sys/cdefs.h>
     32 #include <limits.h>		/* For LONG_BIT */
     33 #include <string.h>		/* For memset() */
     34 #include <sys/types.h>
     35 #include <asm/signal.h>
     36 
     37 #define __ARCH_SI_UID_T __kernel_uid32_t
     38 #include <asm/siginfo.h>
     39 #undef __ARCH_SI_UID_T
     40 
     41 #include <sys/ucontext.h>
     42 #define __BIONIC_HAVE_UCONTEXT_T
     43 
     44 __BEGIN_DECLS
     45 
     46 typedef int sig_atomic_t;
     47 
     48 /* _NSIG is used by the SIGRTMAX definition under <asm/signal.h>, however
     49  * its definition is part of a #if __KERNEL__ .. #endif block in the original
     50  * kernel headers and is thus not part of our cleaned-up versions.
     51  *
     52  * Looking at the current kernel sources, it is defined as 64 for all
     53  * architectures except for the 'mips' one which set it to 128.
     54  */
     55 #ifndef _NSIG
     56 #  define _NSIG  64
     57 #endif
     58 
     59 extern const char * const sys_siglist[];
     60 
     61 static __inline__ int sigismember(sigset_t *set, int signum)
     62 {
     63     unsigned long *local_set = (unsigned long *)set;
     64     signum--;
     65     return (int)((local_set[signum/LONG_BIT] >> (signum%LONG_BIT)) & 1);
     66 }
     67 
     68 
     69 static __inline__ int sigaddset(sigset_t *set, int signum)
     70 {
     71     unsigned long *local_set = (unsigned long *)set;
     72     signum--;
     73     local_set[signum/LONG_BIT] |= 1UL << (signum%LONG_BIT);
     74     return 0;
     75 }
     76 
     77 
     78 static __inline__ int sigdelset(sigset_t *set, int signum)
     79 {
     80     unsigned long *local_set = (unsigned long *)set;
     81     signum--;
     82     local_set[signum/LONG_BIT] &= ~(1UL << (signum%LONG_BIT));
     83     return 0;
     84 }
     85 
     86 
     87 static __inline__ int sigemptyset(sigset_t *set)
     88 {
     89     memset(set, 0, sizeof *set);
     90     return 0;
     91 }
     92 
     93 static __inline__ int sigfillset(sigset_t *set)
     94 {
     95     memset(set, ~0, sizeof *set);
     96     return 0;
     97 }
     98 
     99 
    100 /* compatibility types */
    101 typedef void  (*sig_t)(int);
    102 typedef sig_t sighandler_t;
    103 
    104 /* differentiater between sysv and bsd behaviour 8*/
    105 extern __sighandler_t sysv_signal(int, __sighandler_t);
    106 extern __sighandler_t bsd_signal(int, __sighandler_t);
    107 
    108 /* the default is bsd */
    109 static __inline__ __sighandler_t signal(int s, __sighandler_t f)
    110 {
    111     return bsd_signal(s,f);
    112 }
    113 
    114 /* the syscall itself */
    115 extern __sighandler_t __signal(int, __sighandler_t, int);
    116 
    117 extern int sigprocmask(int, const sigset_t *, sigset_t *);
    118 extern int sigaction(int, const struct sigaction *, struct sigaction *);
    119 
    120 extern int sigpending(sigset_t *);
    121 extern int sigsuspend(const sigset_t *);
    122 extern int sigwait(const sigset_t *set, int *sig);
    123 extern int siginterrupt(int  sig, int  flag);
    124 
    125 extern int raise(int);
    126 extern int kill(pid_t, int);
    127 
    128 
    129 __END_DECLS
    130 
    131 #endif /* _SIGNAL_H_ */
    132