#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) || \
    defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)

#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#define MINSIGSTKSZ 6144
#define SIGSTKSZ 12288
#endif

#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
typedef unsigned long greg_t;
typedef unsigned long gregset_t[34];

typedef struct {
  long double vregs[32];
  unsigned int fpsr;
  unsigned int fpcr;
} fpregset_t;
typedef struct sigcontext {
  unsigned long fault_address;
  unsigned long regs[31];
  unsigned long sp, pc, pstate;
  long double __reserved[256];
} mcontext_t;

#define FPSIMD_MAGIC 0x46508001
#define ESR_MAGIC 0x45535201
struct _aarch64_ctx {
  unsigned int magic;
  unsigned int size;
};
struct fpsimd_context {
  struct _aarch64_ctx head;
  unsigned int fpsr;
  unsigned int fpcr;
  long double vregs[32];
};
struct esr_context {
  struct _aarch64_ctx head;
  unsigned long esr;
};
#else
typedef struct { long double __regs[18 + 256]; } mcontext_t;
#endif

struct sigaltstack {
  void* ss_sp;
  int ss_flags;
  size_t ss_size;
};

typedef struct __ucontext {
  unsigned long uc_flags;
  struct ucontext* uc_link;
  stack_t uc_stack;
  sigset_t uc_sigmask;
  mcontext_t uc_mcontext;
} ucontext_t;

#define SA_NOCLDSTOP 1
#define SA_NOCLDWAIT 2
#define SA_SIGINFO 4
#define SA_ONSTACK 0x08000000
#define SA_RESTART 0x10000000
#define SA_NODEFER 0x40000000
#define SA_RESETHAND 0x80000000
#define SA_RESTORER 0x04000000

#endif

#define SIGHUP 1
#define SIGINT 2
#define SIGQUIT 3
#define SIGILL 4
#define SIGTRAP 5
#define SIGABRT 6
#define SIGIOT SIGABRT
#define SIGBUS 7
#define SIGFPE 8
#define SIGKILL 9
#define SIGUSR1 10
#define SIGSEGV 11
#define SIGUSR2 12
#define SIGPIPE 13
#define SIGALRM 14
#define SIGTERM 15
#define SIGSTKFLT 16
#define SIGCHLD 17
#define SIGCONT 18
#define SIGSTOP 19
#define SIGTSTP 20
#define SIGTTIN 21
#define SIGTTOU 22
#define SIGURG 23
#define SIGXCPU 24
#define SIGXFSZ 25
#define SIGVTALRM 26
#define SIGPROF 27
#define SIGWINCH 28
#define SIGIO 29
#define SIGPOLL 29
#define SIGPWR 30
#define SIGSYS 31
#define SIGUNUSED SIGSYS

#define _NSIG 65