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      1 /*
      2  * Copyright (C) 2015 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 
     29 #ifndef _ANDROID_LEGACY_SIGNAL_INLINES_H_
     30 #define _ANDROID_LEGACY_SIGNAL_INLINES_H_
     31 
     32 #include <sys/cdefs.h>
     33 
     34 #if __ANDROID_API__ < __ANDROID_API_L__
     35 
     36 #include <errno.h>
     37 #include <signal.h>
     38 #include <string.h>
     39 
     40 __BEGIN_DECLS
     41 
     42 sighandler_t bsd_signal(int __signal, sighandler_t __handler) __REMOVED_IN(21);
     43 
     44 /* These weren't introduced until L. */
     45 int __libc_current_sigrtmax() __attribute__((__weak__)) __VERSIONER_NO_GUARD;
     46 int __libc_current_sigrtmin() __attribute__((__weak__)) __VERSIONER_NO_GUARD;
     47 
     48 static __inline int __ndk_legacy___libc_current_sigrtmax() {
     49   if (__libc_current_sigrtmax) return __libc_current_sigrtmax();
     50   return __SIGRTMAX; /* Should match __libc_current_sigrtmax. */
     51 }
     52 
     53 static __inline int __ndk_legacy___libc_current_sigrtmin() {
     54   if (__libc_current_sigrtmin) return __libc_current_sigrtmin();
     55   return __SIGRTMIN + 6; /* Should match __libc_current_sigrtmin. */
     56 }
     57 
     58 #undef SIGRTMAX
     59 #define SIGRTMAX __ndk_legacy___libc_current_sigrtmax()
     60 #undef SIGRTMIN
     61 #define SIGRTMIN __ndk_legacy___libc_current_sigrtmin()
     62 
     63 static __inline int sigismember(const sigset_t *set, int signum) {
     64   /* Signal numbers start at 1, but bit positions start at 0. */
     65   int bit = signum - 1;
     66   const unsigned long *local_set = (const unsigned long *)set;
     67   if (set == NULL || bit < 0 || bit >= (int)(8 * sizeof(sigset_t))) {
     68     errno = EINVAL;
     69     return -1;
     70   }
     71   return (int)((local_set[bit / LONG_BIT] >> (bit % LONG_BIT)) & 1);
     72 }
     73 
     74 static __inline int sigaddset(sigset_t *set, int signum) {
     75   /* Signal numbers start at 1, but bit positions start at 0. */
     76   int bit = signum - 1;
     77   unsigned long *local_set = (unsigned long *)set;
     78   if (set == NULL || bit < 0 || bit >= (int)(8 * sizeof(sigset_t))) {
     79     errno = EINVAL;
     80     return -1;
     81   }
     82   local_set[bit / LONG_BIT] |= 1UL << (bit % LONG_BIT);
     83   return 0;
     84 }
     85 
     86 static __inline int sigdelset(sigset_t *set, int signum) {
     87   /* Signal numbers start at 1, but bit positions start at 0. */
     88   int bit = signum - 1;
     89   unsigned long *local_set = (unsigned long *)set;
     90   if (set == NULL || bit < 0 || bit >= (int)(8 * sizeof(sigset_t))) {
     91     errno = EINVAL;
     92     return -1;
     93   }
     94   local_set[bit / LONG_BIT] &= ~(1UL << (bit % LONG_BIT));
     95   return 0;
     96 }
     97 
     98 static __inline int sigemptyset(sigset_t *set) {
     99   if (set == NULL) {
    100     errno = EINVAL;
    101     return -1;
    102   }
    103   memset(set, 0, sizeof(sigset_t));
    104   return 0;
    105 }
    106 
    107 static __inline int sigfillset(sigset_t *set) {
    108   if (set == NULL) {
    109     errno = EINVAL;
    110     return -1;
    111   }
    112   memset(set, ~0, sizeof(sigset_t));
    113   return 0;
    114 }
    115 
    116 static __inline sighandler_t signal(int s, sighandler_t f) {
    117   return bsd_signal(s, f);
    118 }
    119 
    120 __END_DECLS
    121 
    122 #endif /* __ANDROID_API__ < __ANDROID_API_L__ */
    123 
    124 #endif /* _ANDROID_LEGACY_SIGNAL_INLINES_H_ */
    125