/*

  +----------------------------------------------------------------------+

  | Zend Signal Handling                                                 |

  +----------------------------------------------------------------------+

  | Copyright (c) The PHP Group                                          |

  +----------------------------------------------------------------------+

  | This source file is subject to version 3.01 of the PHP license,      |

  | that is bundled with this package in the file LICENSE, and is        |

  | available through the world-wide-web at the following url:           |

  | http://www.php.net/license/3_01.txt                                  |

  | If you did not receive a copy of the PHP license and are unable to   |

  | obtain it through the world-wide-web, please send a note to          |

  | license@php.net so we can mail you a copy immediately.               |

  +----------------------------------------------------------------------+

  | Authors: Lucas Nealan <lucas@php.net>                                |

  |          Arnaud Le Blanc <lbarnaud@php.net>                          |

  +----------------------------------------------------------------------+

 */

#ifndef ZEND_SIGNAL_H

#define ZEND_SIGNAL_H

#ifdef ZEND_SIGNALS

#include <signal.h>

#ifndef NSIG

#define NSIG 65

#endif

#ifndef ZEND_SIGNAL_QUEUE_SIZE

#define ZEND_SIGNAL_QUEUE_SIZE 64

#endif

/* Signal structs */

typedef struct _zend_signal_entry_t {

  int   flags;          /* sigaction style flags */

  void* handler;      /* signal handler or context */

} zend_signal_entry_t;

typedef struct _zend_signal_t {

  int signo;

  siginfo_t *siginfo;

  void* context;

} zend_signal_t;

typedef struct _zend_signal_queue_t {

  zend_signal_t zend_signal;

  struct _zend_signal_queue_t *next;

} zend_signal_queue_t;

/* Signal Globals */

typedef struct _zend_signal_globals_t {

  int depth;

  int blocked;            /* 1==TRUE, 0==FALSE */

  int running;            /* in signal handler execution */

  int active;             /* internal signal handling is enabled */

  zend_bool check;        /* check for replaced handlers on shutdown */

  zend_bool reset;        /* reset signal handlers on each request */

  zend_signal_entry_t handlers[NSIG];

  zend_signal_queue_t pstorage[ZEND_SIGNAL_QUEUE_SIZE], *phead, *ptail, *pavail; /* pending queue */

} zend_signal_globals_t;

# ifdef ZTS

#  define SIGG(v) ZEND_TSRMG_FAST(zend_signal_globals_offset, zend_signal_globals_t *, v)

BEGIN_EXTERN_C()

ZEND_API extern int zend_signal_globals_id;

ZEND_API extern size_t zend_signal_globals_offset;

END_EXTERN_C()

# else

#  define SIGG(v) (zend_signal_globals.v)

BEGIN_EXTERN_C()

ZEND_API extern zend_signal_globals_t zend_signal_globals;

END_EXTERN_C()

# endif /* not ZTS */

# ifdef ZTS

#  define ZEND_SIGNAL_BLOCK_INTERRUPTIONS() if (EXPECTED(zend_signal_globals_id)) { SIGG(depth)++; }

#  define ZEND_SIGNAL_UNBLOCK_INTERRUPTIONS() if (EXPECTED(zend_signal_globals_id) && UNEXPECTED(((SIGG(depth)--) == SIGG(blocked)))) { zend_signal_handler_unblock(); }

# else /* ZTS */

#  define ZEND_SIGNAL_BLOCK_INTERRUPTIONS()  SIGG(depth)++;

#  define ZEND_SIGNAL_UNBLOCK_INTERRUPTIONS() if (((SIGG(depth)--) == SIGG(blocked))) { zend_signal_handler_unblock(); }

# endif /* not ZTS */

ZEND_API void zend_signal_handler_unblock(void);

void zend_signal_activate(void);

void zend_signal_deactivate(void);

BEGIN_EXTERN_C()

ZEND_API void zend_signal_startup(void);

END_EXTERN_C()

void zend_signal_init(void);

ZEND_API void zend_signal(int signo, void (*handler)(int));

ZEND_API void zend_sigaction(int signo, const struct sigaction *act, struct sigaction *oldact);

#else /* ZEND_SIGNALS */

# define ZEND_SIGNAL_BLOCK_INTERRUPTIONS()

# define ZEND_SIGNAL_UNBLOCK_INTERRUPTIONS()

# define zend_signal_activate()

# define zend_signal_deactivate()

# define zend_signal_startup()

# define zend_signal_init()

# define zend_signal(signo, handler)           signal(signo, handler)

# define zend_sigaction(signo, act, oldact)    sigaction(signo, act, oldact)

#endif /* ZEND_SIGNALS */

#endif /* ZEND_SIGNAL_H */