text: /*
   * Copyright (C) 2015 The Android Open Source Project
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *  * Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *  * Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #ifndef _ANDROID_LEGACY_SIGNAL_INLINES_H_
  #define _ANDROID_LEGACY_SIGNAL_INLINES_H_
  
  #include <sys/cdefs.h>
  
  #if __ANDROID_API__ < __ANDROID_API_L__
  
  #include <errno.h>
  #include <signal.h>
  #include <string.h>
  
  __BEGIN_DECLS
  
  sighandler_t bsd_signal(int __signal, sighandler_t __handler) __REMOVED_IN(21);
  
  /* These weren't introduced until L. */
  int __libc_current_sigrtmax() __attribute__((__weak__)) __VERSIONER_NO_GUARD;
  int __libc_current_sigrtmin() __attribute__((__weak__)) __VERSIONER_NO_GUARD;
  
  static __inline int __ndk_legacy___libc_current_sigrtmax() {
    if (__libc_current_sigrtmax) return __libc_current_sigrtmax();
    return __SIGRTMAX; /* Should match __libc_current_sigrtmax. */
  }
  
  static __inline int __ndk_legacy___libc_current_sigrtmin() {
    if (__libc_current_sigrtmin) return __libc_current_sigrtmin();
    return __SIGRTMIN + 4; /* Should match __libc_current_sigrtmin. */
  }
  
  #undef SIGRTMAX
  #define SIGRTMAX __ndk_legacy___libc_current_sigrtmax()
  #undef SIGRTMIN
  #define SIGRTMIN __ndk_legacy___libc_current_sigrtmin()
  
  static __inline int sigismember(const sigset_t *set, int signum) {
    /* Signal numbers start at 1, but bit positions start at 0. */
    int bit = signum - 1;
    const unsigned long *local_set = (const unsigned long *)set;
    if (set == NULL || bit < 0 || bit >= (int)(8 * sizeof(sigset_t))) {
      errno = EINVAL;
      return -1;
    }
    return (int)((local_set[bit / LONG_BIT] >> (bit % LONG_BIT)) & 1);
  }
  
  static __inline int sigaddset(sigset_t *set, int signum) {
    /* Signal numbers start at 1, but bit positions start at 0. */
    int bit = signum - 1;
    unsigned long *local_set = (unsigned long *)set;
    if (set == NULL || bit < 0 || bit >= (int)(8 * sizeof(sigset_t))) {
      errno = EINVAL;
      return -1;
    }
    local_set[bit / LONG_BIT] |= 1UL << (bit % LONG_BIT);
    return 0;
  }
  
  static __inline int sigdelset(sigset_t *set, int signum) {
    /* Signal numbers start at 1, but bit positions start at 0. */
    int bit = signum - 1;
    unsigned long *local_set = (unsigned long *)set;
    if (set == NULL || bit < 0 || bit >= (int)(8 * sizeof(sigset_t))) {
      errno = EINVAL;
      return -1;
    }
    local_set[bit / LONG_BIT] &= ~(1UL << (bit % LONG_BIT));
    return 0;
  }
  
  static __inline int sigemptyset(sigset_t *set) {
    if (set == NULL) {
      errno = EINVAL;
      return -1;
    }
    memset(set, 0, sizeof(sigset_t));
    return 0;
  }
  
  static __inline int sigfillset(sigset_t *set) {
    if (set == NULL) {
      errno = EINVAL;
      return -1;
    }
    memset(set, ~0, sizeof(sigset_t));
    return 0;
  }
  
  static __inline sighandler_t signal(int s, sighandler_t f) {
    return bsd_signal(s, f);
  }
  
  __END_DECLS
  
  #endif /* __ANDROID_API__ < __ANDROID_API_L__ */
  
  #endif /* _ANDROID_LEGACY_SIGNAL_INLINES_H_ */
  