libc/include/signal.h

/*
 * Copyright (C) 2008 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 _SIGNAL_H_
#define _SIGNAL_H_

#include <sys/cdefs.h>
#include <sys/types.h>

#include <asm/sigcontext.h>
#include <bits/pthread_types.h>
#include <bits/timespec.h>
#include <limits.h>

/* For 64-bit (and mips), the kernel's struct sigaction doesn't match the
 * POSIX one, so we need to expose our own and translate behind the scenes.
 * For 32-bit, we're stuck with the definitions we already shipped,
 * even though they contain a sigset_t that's too small. See sigaction64.
 */
#define sigaction __kernel_sigaction
#include <linux/signal.h>
#undef sigaction

#include <sys/ucontext.h>
#define __BIONIC_HAVE_UCONTEXT_T

__BEGIN_DECLS

typedef int sig_atomic_t;

/* The arm and x86 kernel header files don't define _NSIG. */
#ifndef _KERNEL__NSIG
#define _KERNEL__NSIG 64
#endif

/* Userspace's NSIG is the kernel's _NSIG + 1. */
#define _NSIG (_KERNEL__NSIG + 1)
#define NSIG _NSIG

/* The kernel headers define SIG_DFL (0) and SIG_IGN (1) but not SIG_HOLD, since
 * SIG_HOLD is only used by the deprecated SysV signal API.
 */
#define SIG_HOLD __BIONIC_CAST(reinterpret_cast, sighandler_t, 2)

/* We take a few real-time signals for ourselves. May as well use the same names as glibc. */
#define SIGRTMIN (__libc_current_sigrtmin())
#define SIGRTMAX (__libc_current_sigrtmax())
int __libc_current_sigrtmin(void) __INTRODUCED_IN(21);
int __libc_current_sigrtmax(void) __INTRODUCED_IN(21);

extern const char* const sys_siglist[_NSIG];
extern const char* const sys_signame[_NSIG]; /* BSD compatibility. */

typedef __sighandler_t sig_t; /* BSD compatibility. */
typedef __sighandler_t sighandler_t; /* glibc compatibility. */

#define si_timerid si_tid /* glibc compatibility. */

/* sigset_t is already large enough on LP64 and mips, but other LP32's sigset_t
 * is just `unsigned long`.
 */
#if defined(__LP64__) || defined(__mips__)
typedef sigset_t sigset64_t;
#else
typedef struct { unsigned long __bits[_KERNEL__NSIG/LONG_BIT]; } sigset64_t;
#endif

#if defined(__LP64__)

#define __SIGACTION_BODY \
  int sa_flags; \
  union { \
    sighandler_t sa_handler; \
    void (*sa_sigaction)(int, struct siginfo*, void*); \
  }; \
  sigset_t sa_mask; \
  void (*sa_restorer)(void); \

struct sigaction { __SIGACTION_BODY };
struct sigaction64 { __SIGACTION_BODY };

#undef __SIGACTION_BODY

#elif defined(__mips__)

#define __SIGACTION_BODY \
  int sa_flags; \
  union { \
    sighandler_t sa_handler; \
    void (*sa_sigaction)(int, struct siginfo*, void*); \
  }; \
  sigset_t sa_mask; \

struct sigaction { __SIGACTION_BODY };
struct sigaction64 { __SIGACTION_BODY };

#undef __SIGACTION_BODY

#else

#undef sa_handler
#undef sa_sigaction

struct sigaction {
  union {
    sighandler_t sa_handler;
    void (*sa_sigaction)(int, struct siginfo*, void*);
  };
  sigset_t sa_mask;
  int sa_flags;
  void (*sa_restorer)(void);
};

/* This matches the kernel's internal structure. */
struct sigaction64 {
  union {
    sighandler_t sa_handler;
    void (*sa_sigaction)(int, struct siginfo*, void*);
  };
  int sa_flags;
  void (*sa_restorer)(void);
  sigset64_t sa_mask;
};

#endif

int sigaction(int __signal, const struct sigaction* __new_action, struct sigaction* __old_action);
int sigaction64(int __signal, const struct sigaction64* __new_action, struct sigaction64* __old_action) __INTRODUCED_IN(28);

int siginterrupt(int __signal, int __flag);

#if __ANDROID_API__ >= __ANDROID_API_L__
sighandler_t signal(int __signal, sighandler_t __handler) __INTRODUCED_IN(21);
int sigaddset(sigset_t* __set, int __signal) __INTRODUCED_IN(21);
int sigaddset64(sigset64_t* __set, int __signal) __INTRODUCED_IN(28);
int sigdelset(sigset_t* __set, int __signal) __INTRODUCED_IN(21);
int sigdelset64(sigset64_t* __set, int __signal) __INTRODUCED_IN(28);
int sigemptyset(sigset_t* __set) __INTRODUCED_IN(21);
int sigemptyset64(sigset64_t* __set) __INTRODUCED_IN(28);
int sigfillset(sigset_t* __set) __INTRODUCED_IN(21);
int sigfillset64(sigset64_t* __set) __INTRODUCED_IN(28);
int sigismember(const sigset_t* __set, int __signal) __INTRODUCED_IN(21);
int sigismember64(const sigset64_t* __set, int __signal) __INTRODUCED_IN(28);
#else
// Implemented as static inlines before 21.
#endif

int sigpending(sigset_t* __set);
int sigpending64(sigset64_t* __set) __INTRODUCED_IN(28);
int sigprocmask(int __how, const sigset_t* __new_set, sigset_t* __old_set);
int sigprocmask64(int __how, const sigset64_t* __new_set, sigset64_t* __old_set) __INTRODUCED_IN(28);
int sigsuspend(const sigset_t* __mask);
int sigsuspend64(const sigset64_t* __mask) __INTRODUCED_IN(28);
int sigwait(const sigset_t* __set, int* __signal);
int sigwait64(const sigset64_t* __set, int* __signal) __INTRODUCED_IN(28);

int sighold(int __signal)
  __attribute__((deprecated("use sigprocmask() or pthread_sigmask() instead")))
  __INTRODUCED_IN(26);
int sigignore(int __signal)
  __attribute__((deprecated("use sigaction() instead"))) __INTRODUCED_IN(26);
int sigpause(int __signal)
  __attribute__((deprecated("use sigsuspend() instead"))) __INTRODUCED_IN(26);
int sigrelse(int __signal)
  __attribute__((deprecated("use sigprocmask() or pthread_sigmask() instead")))
  __INTRODUCED_IN(26);
sighandler_t sigset(int __signal, sighandler_t __handler)
  __attribute__((deprecated("use sigaction() instead"))) __INTRODUCED_IN(26);

int raise(int __signal);
int kill(pid_t __pid, int __signal);
int killpg(int __pgrp, int __signal);
int tgkill(int __tgid, int __tid, int __signal) __INTRODUCED_IN_32(16);

int sigaltstack(const stack_t* __new_signal_stack, stack_t* __old_signal_stack);

void psiginfo(const siginfo_t* __info, const char* __msg) __INTRODUCED_IN(17);
void psignal(int __signal, const char* __msg) __INTRODUCED_IN(17);

int pthread_kill(pthread_t __pthread, int __signal);
int pthread_sigmask(int __how, const sigset_t* __new_set, sigset_t* __old_set);
int pthread_sigmask64(int __how, const sigset64_t* __new_set, sigset64_t* __old_set) __INTRODUCED_IN(28);

int sigqueue(pid_t __pid, int __signal, const union sigval __value) __INTRODUCED_IN(23);
int sigtimedwait(const sigset_t* __set, siginfo_t* __info, const struct timespec* __timeout) __INTRODUCED_IN(23);
int sigtimedwait64(const sigset64_t* __set, siginfo_t* __info, const struct timespec* __timeout) __INTRODUCED_IN(28);
int sigwaitinfo(const sigset_t* __set, siginfo_t* __info) __INTRODUCED_IN(23);
int sigwaitinfo64(const sigset64_t* __set, siginfo_t* __info) __INTRODUCED_IN(28);

__END_DECLS

#include <android/legacy_signal_inlines.h>

#endif