/*
   +----------------------------------------------------------------------+
   | PHP Version 5                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2011 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.               |
   +----------------------------------------------------------------------+
   | Author: Jason Greene <jason@inetgurus.net>                           |
   +----------------------------------------------------------------------+
 */

/* $Id$ */

#define PCNTL_DEBUG 0

#if PCNTL_DEBUG
#define DEBUG_OUT printf("DEBUG: ");printf
#define IF_DEBUG(z) z
#else
#define IF_DEBUG(z)
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "php_pcntl.h"
#include "php_signal.h"
#include "php_ticks.h"

#if HAVE_GETPRIORITY || HAVE_SETPRIORITY || HAVE_WAIT3
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/resource.h>
#endif

#include <errno.h>

ZEND_DECLARE_MODULE_GLOBALS(pcntl)
static PHP_GINIT_FUNCTION(pcntl);

/* {{{ arginfo */
ZEND_BEGIN_ARG_INFO(arginfo_pcntl_void, 0)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_waitpid, 0, 0, 2)
	ZEND_ARG_INFO(0, pid)
	ZEND_ARG_INFO(1, status)
	ZEND_ARG_INFO(0, options)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_wait, 0, 0, 1)
	ZEND_ARG_INFO(1, status)
	ZEND_ARG_INFO(0, options)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_signal, 0, 0, 2)
	ZEND_ARG_INFO(0, signo)
	ZEND_ARG_INFO(0, handler)
	ZEND_ARG_INFO(0, restart_syscalls)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_sigprocmask, 0, 0, 2)
	ZEND_ARG_INFO(0, how)
	ZEND_ARG_INFO(0, set)
	ZEND_ARG_INFO(1, oldset)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_sigwaitinfo, 0, 0, 1)
	ZEND_ARG_INFO(0, set)
	ZEND_ARG_INFO(1, info)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_sigtimedwait, 0, 0, 1)
	ZEND_ARG_INFO(0, set)
	ZEND_ARG_INFO(1, info)
	ZEND_ARG_INFO(0, seconds)
	ZEND_ARG_INFO(0, nanoseconds)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_wifexited, 0, 0, 1)
	ZEND_ARG_INFO(0, status)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_wifstopped, 0, 0, 1)
	ZEND_ARG_INFO(0, status)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_wifsignaled, 0, 0, 1)
	ZEND_ARG_INFO(0, status)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_wifexitstatus, 0, 0, 1)
	ZEND_ARG_INFO(0, status)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_wtermsig, 0, 0, 1)
	ZEND_ARG_INFO(0, status)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_wstopsig, 0, 0, 1)
	ZEND_ARG_INFO(0, status)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_exec, 0, 0, 1)
	ZEND_ARG_INFO(0, path)
	ZEND_ARG_INFO(0, args)
	ZEND_ARG_INFO(0, envs)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_alarm, 0, 0, 1)
	ZEND_ARG_INFO(0, seconds)
ZEND_END_ARG_INFO()

#ifdef HAVE_GETPRIORITY
ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_getpriority, 0, 0, 0)
	ZEND_ARG_INFO(0, pid)
	ZEND_ARG_INFO(0, process_identifier)
ZEND_END_ARG_INFO()
#endif

#ifdef HAVE_SETPRIORITY
ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_setpriority, 0, 0, 1)
	ZEND_ARG_INFO(0, priority)
	ZEND_ARG_INFO(0, pid)
	ZEND_ARG_INFO(0, process_identifier)
ZEND_END_ARG_INFO()
#endif

ZEND_BEGIN_ARG_INFO_EX(arginfo_pcntl_strerror, 0, 0, 1)
        ZEND_ARG_INFO(0, errno)
ZEND_END_ARG_INFO()
/* }}} */

const zend_function_entry pcntl_functions[] = {
	PHP_FE(pcntl_fork,			arginfo_pcntl_void)
	PHP_FE(pcntl_waitpid,		arginfo_pcntl_waitpid)
	PHP_FE(pcntl_wait,			arginfo_pcntl_wait)
	PHP_FE(pcntl_signal,		arginfo_pcntl_signal)
	PHP_FE(pcntl_signal_dispatch,	arginfo_pcntl_void)
	PHP_FE(pcntl_wifexited,		arginfo_pcntl_wifexited)
	PHP_FE(pcntl_wifstopped,	arginfo_pcntl_wifstopped)
	PHP_FE(pcntl_wifsignaled,	arginfo_pcntl_wifsignaled)
	PHP_FE(pcntl_wexitstatus,	arginfo_pcntl_wifexitstatus)
	PHP_FE(pcntl_wtermsig,		arginfo_pcntl_wtermsig)
	PHP_FE(pcntl_wstopsig,		arginfo_pcntl_wstopsig)
	PHP_FE(pcntl_exec,			arginfo_pcntl_exec)
	PHP_FE(pcntl_alarm,			arginfo_pcntl_alarm)
	PHP_FE(pcntl_get_last_error,	arginfo_pcntl_void)
	PHP_FALIAS(pcntl_errno, pcntl_get_last_error,	NULL)
	PHP_FE(pcntl_strerror,		arginfo_pcntl_strerror)
#ifdef HAVE_GETPRIORITY
	PHP_FE(pcntl_getpriority,	arginfo_pcntl_getpriority)
#endif
#ifdef HAVE_SETPRIORITY
	PHP_FE(pcntl_setpriority,	arginfo_pcntl_setpriority)
#endif
#ifdef HAVE_SIGPROCMASK
	PHP_FE(pcntl_sigprocmask,	arginfo_pcntl_sigprocmask)
#endif
#if HAVE_SIGWAITINFO && HAVE_SIGTIMEDWAIT
	PHP_FE(pcntl_sigwaitinfo,	arginfo_pcntl_sigwaitinfo)
	PHP_FE(pcntl_sigtimedwait,	arginfo_pcntl_sigtimedwait)
#endif
	{NULL, NULL, NULL}	
};

zend_module_entry pcntl_module_entry = {
	STANDARD_MODULE_HEADER,
	"pcntl",
	pcntl_functions,
	PHP_MINIT(pcntl),
	PHP_MSHUTDOWN(pcntl),
	PHP_RINIT(pcntl),
	PHP_RSHUTDOWN(pcntl),
	PHP_MINFO(pcntl),
	NO_VERSION_YET,
	PHP_MODULE_GLOBALS(pcntl),
	PHP_GINIT(pcntl),
	NULL,
	NULL,
	STANDARD_MODULE_PROPERTIES_EX
};

#ifdef COMPILE_DL_PCNTL
ZEND_GET_MODULE(pcntl)
#endif

static void pcntl_signal_handler(int);
static void pcntl_signal_dispatch();
  
void php_register_signal_constants(INIT_FUNC_ARGS)
{

	/* Wait Constants */
#ifdef WNOHANG
	REGISTER_LONG_CONSTANT("WNOHANG",  (long) WNOHANG, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef WUNTRACED
	REGISTER_LONG_CONSTANT("WUNTRACED",  (long) WUNTRACED, CONST_CS | CONST_PERSISTENT);
#endif

	/* Signal Constants */
	REGISTER_LONG_CONSTANT("SIG_IGN",  (long) SIG_IGN, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIG_DFL",  (long) SIG_DFL, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIG_ERR",  (long) SIG_ERR, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGHUP",   (long) SIGHUP,  CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGINT",   (long) SIGINT,  CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGQUIT",  (long) SIGQUIT, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGILL",   (long) SIGILL,  CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGTRAP",  (long) SIGTRAP, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGABRT",  (long) SIGABRT, CONST_CS | CONST_PERSISTENT);
#ifdef SIGIOT
	REGISTER_LONG_CONSTANT("SIGIOT",   (long) SIGIOT,  CONST_CS | CONST_PERSISTENT);
#endif
	REGISTER_LONG_CONSTANT("SIGBUS",   (long) SIGBUS,  CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGFPE",   (long) SIGFPE,  CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGKILL",  (long) SIGKILL, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGUSR1",  (long) SIGUSR1, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGSEGV",  (long) SIGSEGV, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGUSR2",  (long) SIGUSR2, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGPIPE",  (long) SIGPIPE, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGALRM",  (long) SIGALRM, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGTERM",  (long) SIGTERM, CONST_CS | CONST_PERSISTENT);
#ifdef SIGSTKFLT
	REGISTER_LONG_CONSTANT("SIGSTKFLT",(long) SIGSTKFLT, CONST_CS | CONST_PERSISTENT);
#endif 
#ifdef SIGCLD
	REGISTER_LONG_CONSTANT("SIGCLD",   (long) SIGCLD, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef SIGCHLD
	REGISTER_LONG_CONSTANT("SIGCHLD",  (long) SIGCHLD, CONST_CS | CONST_PERSISTENT);
#endif
	REGISTER_LONG_CONSTANT("SIGCONT",  (long) SIGCONT, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGSTOP",  (long) SIGSTOP, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGTSTP",  (long) SIGTSTP, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGTTIN",  (long) SIGTTIN, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGTTOU",  (long) SIGTTOU, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGURG",   (long) SIGURG , CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGXCPU",  (long) SIGXCPU, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGXFSZ",  (long) SIGXFSZ, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGVTALRM",(long) SIGVTALRM, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGPROF",  (long) SIGPROF, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGWINCH", (long) SIGWINCH, CONST_CS | CONST_PERSISTENT);
#ifdef SIGPOLL
	REGISTER_LONG_CONSTANT("SIGPOLL",  (long) SIGPOLL, CONST_CS | CONST_PERSISTENT);
#endif
	REGISTER_LONG_CONSTANT("SIGIO",    (long) SIGIO, CONST_CS | CONST_PERSISTENT);
#ifdef SIGPWR
	REGISTER_LONG_CONSTANT("SIGPWR",   (long) SIGPWR, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef SIGSYS
	REGISTER_LONG_CONSTANT("SIGSYS",   (long) SIGSYS, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIGBABY",  (long) SIGSYS, CONST_CS | CONST_PERSISTENT);
#endif

#if HAVE_GETPRIORITY || HAVE_SETPRIORITY
	REGISTER_LONG_CONSTANT("PRIO_PGRP", PRIO_PGRP, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("PRIO_USER", PRIO_USER, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("PRIO_PROCESS", PRIO_PROCESS, CONST_CS | CONST_PERSISTENT);
#endif

	/* {{{ "how" argument for sigprocmask */
#ifdef HAVE_SIGPROCMASK
	REGISTER_LONG_CONSTANT("SIG_BLOCK",   SIG_BLOCK, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIG_UNBLOCK", SIG_UNBLOCK, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SIG_SETMASK", SIG_SETMASK, CONST_CS | CONST_PERSISTENT);
#endif
	/* }}} */

	/* {{{ si_code */
#if HAVE_SIGWAITINFO && HAVE_SIGTIMEDWAIT
	REGISTER_LONG_CONSTANT("SI_USER",    SI_USER,    CONST_CS | CONST_PERSISTENT);
#ifdef SI_NOINFO
	REGISTER_LONG_CONSTANT("SI_NOINFO",  SI_NOINFO,  CONST_CS | CONST_PERSISTENT);
#endif
#ifdef SI_KERNEL
	REGISTER_LONG_CONSTANT("SI_KERNEL",  SI_KERNEL,  CONST_CS | CONST_PERSISTENT);
#endif
	REGISTER_LONG_CONSTANT("SI_QUEUE",   SI_QUEUE,   CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SI_TIMER",   SI_TIMER,   CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SI_MESGQ",   SI_MESGQ,   CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("SI_ASYNCIO", SI_ASYNCIO, CONST_CS | CONST_PERSISTENT);
#ifdef SI_SIGIO
	REGISTER_LONG_CONSTANT("SI_SIGIO",   SI_SIGIO,   CONST_CS | CONST_PERSISTENT);
#endif
#ifdef SI_TKILL
	REGISTER_LONG_CONSTANT("SI_TKILL",   SI_TKILL,   CONST_CS | CONST_PERSISTENT);
#endif

	/* si_code for SIGCHILD */
#ifdef CLD_EXITED
	REGISTER_LONG_CONSTANT("CLD_EXITED",    CLD_EXITED,    CONST_CS | CONST_PERSISTENT);
#endif
#ifdef CLD_KILLED
	REGISTER_LONG_CONSTANT("CLD_KILLED",    CLD_KILLED,    CONST_CS | CONST_PERSISTENT);
#endif
#ifdef CLD_DUMPED
	REGISTER_LONG_CONSTANT("CLD_DUMPED",    CLD_DUMPED,    CONST_CS | CONST_PERSISTENT);
#endif
#ifdef CLD_TRAPPED
	REGISTER_LONG_CONSTANT("CLD_TRAPPED",   CLD_TRAPPED,   CONST_CS | CONST_PERSISTENT);
#endif
#ifdef CLD_STOPPED
	REGISTER_LONG_CONSTANT("CLD_STOPPED",   CLD_STOPPED,   CONST_CS | CONST_PERSISTENT);
#endif
#ifdef CLD_CONTINUED
	REGISTER_LONG_CONSTANT("CLD_CONTINUED", CLD_CONTINUED, CONST_CS | CONST_PERSISTENT);
#endif

	/* si_code for SIGTRAP */
#ifdef TRAP_BRKPT
	REGISTER_LONG_CONSTANT("TRAP_BRKPT", TRAP_BRKPT, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef TRAP_TRACE
	REGISTER_LONG_CONSTANT("TRAP_TRACE", TRAP_TRACE, CONST_CS | CONST_PERSISTENT);
#endif

	/* si_code for SIGPOLL */
#ifdef POLL_IN
	REGISTER_LONG_CONSTANT("POLL_IN",  POLL_IN,  CONST_CS | CONST_PERSISTENT);
#endif
#ifdef POLL_OUT
	REGISTER_LONG_CONSTANT("POLL_OUT", POLL_OUT, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef POLL_MSG
	REGISTER_LONG_CONSTANT("POLL_MSG", POLL_MSG, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef POLL_ERR
	REGISTER_LONG_CONSTANT("POLL_ERR", POLL_ERR, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef POLL_PRI
	REGISTER_LONG_CONSTANT("POLL_PRI", POLL_PRI, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef POLL_HUP
	REGISTER_LONG_CONSTANT("POLL_HUP", POLL_HUP, CONST_CS | CONST_PERSISTENT);
#endif

#ifdef ILL_ILLOPC
	REGISTER_LONG_CONSTANT("ILL_ILLOPC", ILL_ILLOPC, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef ILL_ILLOPN
	REGISTER_LONG_CONSTANT("ILL_ILLOPN", ILL_ILLOPN, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef ILL_ILLADR
	REGISTER_LONG_CONSTANT("ILL_ILLADR", ILL_ILLADR, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef ILL_ILLTRP
	REGISTER_LONG_CONSTANT("ILL_ILLTRP", ILL_ILLTRP, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef ILL_PRVOPC
	REGISTER_LONG_CONSTANT("ILL_PRVOPC", ILL_PRVOPC, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef ILL_PRVREG
	REGISTER_LONG_CONSTANT("ILL_PRVREG", ILL_PRVREG, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef ILL_COPROC
	REGISTER_LONG_CONSTANT("ILL_COPROC", ILL_COPROC, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef ILL_BADSTK
	REGISTER_LONG_CONSTANT("ILL_BADSTK", ILL_BADSTK, CONST_CS | CONST_PERSISTENT);
#endif

#ifdef FPE_INTDIV
	REGISTER_LONG_CONSTANT("FPE_INTDIV", FPE_INTDIV, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef FPE_INTOVF
	REGISTER_LONG_CONSTANT("FPE_INTOVF", FPE_INTOVF, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef FPE_FLTDIV
	REGISTER_LONG_CONSTANT("FPE_FLTDIV", FPE_FLTDIV, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef FPE_FLTOVF
	REGISTER_LONG_CONSTANT("FPE_FLTOVF", FPE_FLTOVF, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef FPE_FLTUND
	REGISTER_LONG_CONSTANT("FPE_FLTUND", FPE_FLTINV, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef FPE_FLTRES
	REGISTER_LONG_CONSTANT("FPE_FLTRES", FPE_FLTRES, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef FPE_FLTINV
	REGISTER_LONG_CONSTANT("FPE_FLTINV", FPE_FLTINV, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef FPE_FLTSUB
	REGISTER_LONG_CONSTANT("FPE_FLTSUB", FPE_FLTSUB, CONST_CS | CONST_PERSISTENT);
#endif

#ifdef SEGV_MAPERR
	REGISTER_LONG_CONSTANT("SEGV_MAPERR", SEGV_MAPERR, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef SEGV_ACCERR
	REGISTER_LONG_CONSTANT("SEGV_ACCERR", SEGV_ACCERR, CONST_CS | CONST_PERSISTENT);
#endif

#ifdef BUS_ADRALN
	REGISTER_LONG_CONSTANT("BUS_ADRALN", BUS_ADRALN, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef BUS_ADRERR
	REGISTER_LONG_CONSTANT("BUS_ADRERR", BUS_ADRERR, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef BUS_OBJERR
	REGISTER_LONG_CONSTANT("BUS_OBJERR", BUS_OBJERR, CONST_CS | CONST_PERSISTENT);
#endif
#endif /* HAVE_SIGWAITINFO && HAVE_SIGTIMEDWAIT */
	/* }}} */
}

static void php_pcntl_register_errno_constants(INIT_FUNC_ARGS)
{
#ifdef EINTR
	REGISTER_PCNTL_ERRNO_CONSTANT(EINTR);
#endif
#ifdef ECHILD
	REGISTER_PCNTL_ERRNO_CONSTANT(ECHILD);
#endif
#ifdef EINVAL
	REGISTER_PCNTL_ERRNO_CONSTANT(EINVAL);
#endif
#ifdef EAGAIN
	REGISTER_PCNTL_ERRNO_CONSTANT(EAGAIN);
#endif
#ifdef ESRCH
	REGISTER_PCNTL_ERRNO_CONSTANT(ESRCH);
#endif
#ifdef EACCES
	REGISTER_PCNTL_ERRNO_CONSTANT(EACCES);
#endif
#ifdef EPERM
	REGISTER_PCNTL_ERRNO_CONSTANT(EPERM);
#endif
#ifdef ENOMEM
	REGISTER_PCNTL_ERRNO_CONSTANT(ENOMEM);
#endif
#ifdef E2BIG
	REGISTER_PCNTL_ERRNO_CONSTANT(E2BIG);
#endif
#ifdef EFAULT
	REGISTER_PCNTL_ERRNO_CONSTANT(EFAULT);
#endif
#ifdef EIO
	REGISTER_PCNTL_ERRNO_CONSTANT(EIO);
#endif
#ifdef EISDIR
	REGISTER_PCNTL_ERRNO_CONSTANT(EISDIR);
#endif
#ifdef ELIBBAD
	REGISTER_PCNTL_ERRNO_CONSTANT(ELIBBAD);
#endif
#ifdef ELOOP
	REGISTER_PCNTL_ERRNO_CONSTANT(ELOOP);
#endif
#ifdef EMFILE
	REGISTER_PCNTL_ERRNO_CONSTANT(EMFILE);
#endif
#ifdef ENAMETOOLONG
	REGISTER_PCNTL_ERRNO_CONSTANT(ENAMETOOLONG);
#endif
#ifdef ENFILE
	REGISTER_PCNTL_ERRNO_CONSTANT(ENFILE);
#endif
#ifdef ENOENT
	REGISTER_PCNTL_ERRNO_CONSTANT(ENOENT);
#endif
#ifdef ENOEXEC
	REGISTER_PCNTL_ERRNO_CONSTANT(ENOEXEC);
#endif
#ifdef ENOTDIR
	REGISTER_PCNTL_ERRNO_CONSTANT(ENOTDIR);
#endif
#ifdef ETXTBSY
	REGISTER_PCNTL_ERRNO_CONSTANT(ETXTBSY);
#endif
}

static PHP_GINIT_FUNCTION(pcntl)
{ 
	memset(pcntl_globals, 0, sizeof(*pcntl_globals));
}

PHP_RINIT_FUNCTION(pcntl)
{
	zend_hash_init(&PCNTL_G(php_signal_table), 16, NULL, ZVAL_PTR_DTOR, 0);
	PCNTL_G(head) = PCNTL_G(tail) = PCNTL_G(spares) = NULL;
	return SUCCESS;
}

PHP_MINIT_FUNCTION(pcntl)
{
	php_register_signal_constants(INIT_FUNC_ARGS_PASSTHRU);
	php_pcntl_register_errno_constants(INIT_FUNC_ARGS_PASSTHRU);
	php_add_tick_function(pcntl_signal_dispatch);

	return SUCCESS;
}

PHP_MSHUTDOWN_FUNCTION(pcntl)
{
	return SUCCESS;
}

PHP_RSHUTDOWN_FUNCTION(pcntl)
{
	struct php_pcntl_pending_signal *sig;

	/* FIXME: if a signal is delivered after this point, things will go pear shaped;
	 * need to remove signal handlers */
	zend_hash_destroy(&PCNTL_G(php_signal_table));
	while (PCNTL_G(head)) {
		sig = PCNTL_G(head);
		PCNTL_G(head) = sig->next;
		efree(sig);
	}
	while (PCNTL_G(spares)) {
		sig = PCNTL_G(spares);
		PCNTL_G(spares) = sig->next;
		efree(sig);
	}
	return SUCCESS;
}

PHP_MINFO_FUNCTION(pcntl)
{
	php_info_print_table_start();
	php_info_print_table_header(2, "pcntl support", "enabled");
	php_info_print_table_end();
}

/* {{{ proto int pcntl_fork(void)
   Forks the currently running process following the same behavior as the UNIX fork() system call*/
PHP_FUNCTION(pcntl_fork)
{
	pid_t id;

	id = fork();
	if (id == -1) {
		PCNTL_G(last_error) = errno;
		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Error %d", errno);
	}
	
	RETURN_LONG((long) id);
}
/* }}} */

/* {{{ proto int pcntl_alarm(int seconds)
   Set an alarm clock for delivery of a signal*/
PHP_FUNCTION(pcntl_alarm)
{
	long seconds;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &seconds) == FAILURE)
		return;
	
	RETURN_LONG ((long) alarm(seconds));
}
/* }}} */

/* {{{ proto int pcntl_waitpid(int pid, int &status, int options)
   Waits on or returns the status of a forked child as defined by the waitpid() system call */
PHP_FUNCTION(pcntl_waitpid)
{
	long pid, options = 0;
	zval *z_status = NULL;
	int status;
	pid_t child_id;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "lz|l", &pid, &z_status, &options) == FAILURE)
		return;
	
	convert_to_long_ex(&z_status);

	status = Z_LVAL_P(z_status);

	child_id = waitpid((pid_t) pid, &status, options);

	if (child_id < 0) {
		PCNTL_G(last_error) = errno;
	}

	Z_LVAL_P(z_status) = status;

	RETURN_LONG((long) child_id);
}
/* }}} */

/* {{{ proto int pcntl_wait(int &status)
   Waits on or returns the status of a forked child as defined by the waitpid() system call */
PHP_FUNCTION(pcntl_wait)
{
	long options = 0;
	zval *z_status = NULL;
	int status;
	pid_t child_id;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z|l", &z_status, &options) == FAILURE)
		return;
	
	convert_to_long_ex(&z_status);

	status = Z_LVAL_P(z_status);
#ifdef HAVE_WAIT3
	if(options) {
		child_id = wait3(&status, options, NULL);
	}
	else {
		child_id = wait(&status);
	}
#else
	child_id = wait(&status);
#endif
	if (child_id < 0) {
		PCNTL_G(last_error) = errno;
	}

	Z_LVAL_P(z_status) = status;

	RETURN_LONG((long) child_id);
}
/* }}} */

/* {{{ proto bool pcntl_wifexited(int status) 
   Returns true if the child status code represents a successful exit */
PHP_FUNCTION(pcntl_wifexited)
{
#ifdef WIFEXITED
	long status_word;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &status_word) == FAILURE) {
	       return;
	}

	if (WIFEXITED(status_word))
		RETURN_TRUE;
#endif
	RETURN_FALSE;
}
/* }}} */

/* {{{ proto bool pcntl_wifstopped(int status) 
   Returns true if the child status code represents a stopped process (WUNTRACED must have been used with waitpid) */
PHP_FUNCTION(pcntl_wifstopped)
{
#ifdef WIFSTOPPED
	long status_word;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &status_word) == FAILURE) {
	       return;
	}

	if (WIFSTOPPED(status_word))
		RETURN_TRUE;
#endif
	RETURN_FALSE;
}
/* }}} */

/* {{{ proto bool pcntl_wifsignaled(int status) 
   Returns true if the child status code represents a process that was terminated due to a signal */
PHP_FUNCTION(pcntl_wifsignaled)
{
#ifdef WIFSIGNALED
	long status_word;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &status_word) == FAILURE) {
	       return;
	}

	if (WIFSIGNALED(status_word))
		RETURN_TRUE;
#endif
	RETURN_FALSE;
}
/* }}} */

/* {{{ proto int pcntl_wexitstatus(int status) 
   Returns the status code of a child's exit */
PHP_FUNCTION(pcntl_wexitstatus)
{
#ifdef WEXITSTATUS
	long status_word;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &status_word) == FAILURE) {
	       return;
	}

	RETURN_LONG(WEXITSTATUS(status_word));
#else
	RETURN_FALSE;
#endif
}
/* }}} */

/* {{{ proto int pcntl_wtermsig(int status) 
   Returns the number of the signal that terminated the process who's status code is passed  */
PHP_FUNCTION(pcntl_wtermsig)
{
#ifdef WTERMSIG
	long status_word;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &status_word) == FAILURE) {
	       return;
	}

	RETURN_LONG(WTERMSIG(status_word));
#else
	RETURN_FALSE;
#endif
}
/* }}} */

/* {{{ proto int pcntl_wstopsig(int status) 
   Returns the number of the signal that caused the process to stop who's status code is passed */
PHP_FUNCTION(pcntl_wstopsig)
{
#ifdef WSTOPSIG
	long status_word;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &status_word) == FAILURE) {
	       return;
	}

	RETURN_LONG(WSTOPSIG(status_word));
#else
	RETURN_FALSE;
#endif
}
/* }}} */

/* {{{ proto bool pcntl_exec(string path [, array args [, array envs]])
   Executes specified program in current process space as defined by exec(2) */
PHP_FUNCTION(pcntl_exec)
{
	zval *args = NULL, *envs = NULL;
	zval **element;
	HashTable *args_hash, *envs_hash;
	int argc = 0, argi = 0;
	int envc = 0, envi = 0;
	int return_val = 0;
	char **argv = NULL, **envp = NULL;
	char **current_arg, **pair;
	int pair_length;
	char *key;
	uint key_length;
	char *path;
	int path_len;
	ulong key_num;
		
	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|aa", &path, &path_len, &args, &envs) == FAILURE) {
		return;
	}
	
	if (ZEND_NUM_ARGS() > 1) {
		/* Build argumnent list */
		args_hash = HASH_OF(args);
		argc = zend_hash_num_elements(args_hash);
		
		argv = safe_emalloc((argc + 2), sizeof(char *), 0);
		*argv = path;
		for ( zend_hash_internal_pointer_reset(args_hash), current_arg = argv+1; 
			(argi < argc && (zend_hash_get_current_data(args_hash, (void **) &element) == SUCCESS));
			(argi++, current_arg++, zend_hash_move_forward(args_hash)) ) {

			convert_to_string_ex(element);
			*current_arg = Z_STRVAL_PP(element);
		}
		*(current_arg) = NULL;
	} else {
		argv = emalloc(2 * sizeof(char *));
		*argv = path;
		*(argv+1) = NULL;
	}

	if ( ZEND_NUM_ARGS() == 3 ) {
		/* Build environment pair list */
		envs_hash = HASH_OF(envs);
		envc = zend_hash_num_elements(envs_hash);
		
		envp = safe_emalloc((envc + 1), sizeof(char *), 0);
		for ( zend_hash_internal_pointer_reset(envs_hash), pair = envp; 
			(envi < envc && (zend_hash_get_current_data(envs_hash, (void **) &element) == SUCCESS));
			(envi++, pair++, zend_hash_move_forward(envs_hash)) ) {
			switch (return_val = zend_hash_get_current_key_ex(envs_hash, &key, &key_length, &key_num, 0, NULL)) {
				case HASH_KEY_IS_LONG:
					key = emalloc(101);
					snprintf(key, 100, "%ld", key_num);
					key_length = strlen(key);
					break;
				case HASH_KEY_NON_EXISTANT:
					pair--;
					continue;
			}

			convert_to_string_ex(element);

			/* Length of element + equal sign + length of key + null */ 
			pair_length = Z_STRLEN_PP(element) + key_length + 2;
			*pair = emalloc(pair_length);
			strlcpy(*pair, key, key_length); 
			strlcat(*pair, "=", pair_length);
			strlcat(*pair, Z_STRVAL_PP(element), pair_length);
			
			/* Cleanup */
			if (return_val == HASH_KEY_IS_LONG) efree(key);
		}
		*(pair) = NULL;

		if (execve(path, argv, envp) == -1) {
			PCNTL_G(last_error) = errno;
			php_error_docref(NULL TSRMLS_CC, E_WARNING, "Error has occured: (errno %d) %s", errno, strerror(errno));
		}
	
		/* Cleanup */
		for (pair = envp; *pair != NULL; pair++) efree(*pair);
		efree(envp);
	} else {

		if (execv(path, argv) == -1) {
			PCNTL_G(last_error) = errno;
			php_error_docref(NULL TSRMLS_CC, E_WARNING, "Error has occured: (errno %d) %s", errno, strerror(errno));
		}
	}

	efree(argv);
	
	RETURN_FALSE;
}
/* }}} */

/* {{{ proto bool pcntl_signal(int signo, callback handle [, bool restart_syscalls])
   Assigns a system signal handler to a PHP function */
PHP_FUNCTION(pcntl_signal)
{
	zval *handle, **dest_handle = NULL;
	char *func_name;
	long signo;
	zend_bool restart_syscalls = 1;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "lz|b", &signo, &handle, &restart_syscalls) == FAILURE) {
		return;
	}

	if (!PCNTL_G(spares)) {
		/* since calling malloc() from within a signal handler is not portable,
		 * pre-allocate a few records for recording signals */
		int i;
		for (i = 0; i < 32; i++) {
			struct php_pcntl_pending_signal *psig;

			psig = emalloc(sizeof(*psig));
			psig->next = PCNTL_G(spares);
			PCNTL_G(spares) = psig;
		}
	}

	/* Special long value case for SIG_DFL and SIG_IGN */
	if (Z_TYPE_P(handle)==IS_LONG) {
		if (Z_LVAL_P(handle)!= (long) SIG_DFL && Z_LVAL_P(handle) != (long) SIG_IGN) {
			php_error_docref(NULL TSRMLS_CC, E_WARNING, "Invalid value for handle argument specified");
		}
		if (php_signal(signo, (Sigfunc *) Z_LVAL_P(handle), (int) restart_syscalls) == SIG_ERR) {
			PCNTL_G(last_error) = errno;
			php_error_docref(NULL TSRMLS_CC, E_WARNING, "Error assigning signal");
			RETURN_FALSE;
		}
		RETURN_TRUE;
	}
	
	if (!zend_is_callable(handle, 0, &func_name TSRMLS_CC)) {
		PCNTL_G(last_error) = EINVAL;
		php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s is not a callable function name error", func_name);
		efree(func_name);
		RETURN_FALSE;
	}
	efree(func_name);
	
	/* Add the function name to our signal table */
	zend_hash_index_update(&PCNTL_G(php_signal_table), signo, (void **) &handle, sizeof(zval *), (void **) &dest_handle);
	if (dest_handle) zval_add_ref(dest_handle);
	
	if (php_signal4(signo, pcntl_signal_handler, (int) restart_syscalls, 1) == SIG_ERR) {
		PCNTL_G(last_error) = errno;
		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Error assigning signal");
		RETURN_FALSE;
	}
	RETURN_TRUE;
}
/* }}} */

/* {{{ proto bool pcntl_signal_dispatch()
   Dispatch signals to signal handlers */
PHP_FUNCTION(pcntl_signal_dispatch)
{
	pcntl_signal_dispatch();
	RETURN_TRUE;
}
/* }}} */

#ifdef HAVE_SIGPROCMASK
/* {{{ proto bool pcntl_sigprocmask(int how, array set[, array &oldset])
   Examine and change blocked signals */
PHP_FUNCTION(pcntl_sigprocmask)
{
	long          how, signo;
	zval         *user_set, *user_oldset = NULL, **user_signo;
	sigset_t      set, oldset;
	HashPosition  pos;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "la|z", &how, &user_set, &user_oldset) == FAILURE) {
		return;
	}

	if (sigemptyset(&set) != 0 || sigemptyset(&oldset) != 0) {
		PCNTL_G(last_error) = errno;
		php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", strerror(errno));
		RETURN_FALSE;
	}

	zend_hash_internal_pointer_reset_ex(Z_ARRVAL_P(user_set), &pos);
	while (zend_hash_get_current_data_ex(Z_ARRVAL_P(user_set), (void **)&user_signo, &pos) == SUCCESS)
	{
		if (Z_TYPE_PP(user_signo) != IS_LONG) {
			SEPARATE_ZVAL(user_signo);
			convert_to_long_ex(user_signo);
		}
		signo = Z_LVAL_PP(user_signo);
		if (sigaddset(&set, signo) != 0) {
			PCNTL_G(last_error) = errno;
			php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", strerror(errno));
			RETURN_FALSE;
		}
		zend_hash_move_forward_ex(Z_ARRVAL_P(user_set), &pos);
	}

	if (sigprocmask(how, &set, &oldset) != 0) {
		PCNTL_G(last_error) = errno;
		php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", strerror(errno));
		RETURN_FALSE;
	}

	if (user_oldset != NULL) {
		if (Z_TYPE_P(user_oldset) != IS_ARRAY) {
			zval_dtor(user_oldset);
			array_init(user_oldset);
		} else {
			zend_hash_clean(Z_ARRVAL_P(user_oldset));
		}
		for (signo = 1; signo < MAX(NSIG-1, SIGRTMAX); ++signo) {
			if (sigismember(&oldset, signo) != 1) {
				continue;
			}
			add_next_index_long(user_oldset, signo);
		}
	}

	RETURN_TRUE;
}
/* }}} */
#endif

#if HAVE_SIGWAITINFO && HAVE_SIGTIMEDWAIT
static void pcntl_sigwaitinfo(INTERNAL_FUNCTION_PARAMETERS, int timedwait) /* {{{ */
{
	zval            *user_set, **user_signo, *user_siginfo = NULL;
	long             tv_sec = 0, tv_nsec = 0;
	sigset_t         set;
	HashPosition     pos;
	int              signo;
	siginfo_t        siginfo;
	struct timespec  timeout;

	if (timedwait) {
		if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "a|zll", &user_set, &user_siginfo, &tv_sec, &tv_nsec) == FAILURE) {
			return;
		}
	} else {
		if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "a|z", &user_set, &user_siginfo) == FAILURE) {
			return;
		}
	}

	if (sigemptyset(&set) != 0) {
		PCNTL_G(last_error) = errno;
		php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", strerror(errno));
		RETURN_FALSE;
	}

	zend_hash_internal_pointer_reset_ex(Z_ARRVAL_P(user_set), &pos);
	while (zend_hash_get_current_data_ex(Z_ARRVAL_P(user_set), (void **)&user_signo, &pos) == SUCCESS)
	{
		if (Z_TYPE_PP(user_signo) != IS_LONG) {
			SEPARATE_ZVAL(user_signo);
			convert_to_long_ex(user_signo);
		}
		signo = Z_LVAL_PP(user_signo);
		if (sigaddset(&set, signo) != 0) {
			PCNTL_G(last_error) = errno;
			php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", strerror(errno));
			RETURN_FALSE;
		}
		zend_hash_move_forward_ex(Z_ARRVAL_P(user_set), &pos);
	}

	if (timedwait) {
		timeout.tv_sec  = (time_t) tv_sec;
		timeout.tv_nsec = tv_nsec;
		signo = sigtimedwait(&set, &siginfo, &timeout);
	} else {
		signo = sigwaitinfo(&set, &siginfo);
	}
	if (signo == -1 && errno != EAGAIN) {
		PCNTL_G(last_error) = errno;
		php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", strerror(errno));
	}

	/*
	 * sigtimedwait and sigwaitinfo can return 0 on success on some 
	 * platforms, e.g. NetBSD
	 */
	if (!signo && siginfo.si_signo) {
		signo = siginfo.si_signo;
	}

	if (signo > 0 && user_siginfo) {
		if (Z_TYPE_P(user_siginfo) != IS_ARRAY) {
			zval_dtor(user_siginfo);
			array_init(user_siginfo);
		} else {
			zend_hash_clean(Z_ARRVAL_P(user_siginfo));
		}
		add_assoc_long_ex(user_siginfo, "signo", sizeof("signo"), siginfo.si_signo);
		add_assoc_long_ex(user_siginfo, "errno", sizeof("errno"), siginfo.si_errno);
		add_assoc_long_ex(user_siginfo, "code",  sizeof("code"),  siginfo.si_code);
		switch(signo) {
#ifdef SIGCHLD
			case SIGCHLD:
				add_assoc_long_ex(user_siginfo,   "status", sizeof("status"), siginfo.si_status);
# ifdef si_utime
				add_assoc_double_ex(user_siginfo, "utime",  sizeof("utime"),  siginfo.si_utime);
# endif
# ifdef si_stime
				add_assoc_double_ex(user_siginfo, "stime",  sizeof("stime"),  siginfo.si_stime);
# endif
				add_assoc_long_ex(user_siginfo,   "pid",    sizeof("pid"),    siginfo.si_pid);
				add_assoc_long_ex(user_siginfo,   "uid",    sizeof("uid"),    siginfo.si_uid);
				break;
#endif
			case SIGILL:
			case SIGFPE:
			case SIGSEGV:
			case SIGBUS:
				add_assoc_double_ex(user_siginfo, "addr", sizeof("addr"), (long)siginfo.si_addr);
				break;
#ifdef SIGPOLL
			case SIGPOLL:
				add_assoc_long_ex(user_siginfo, "band", sizeof("band"), siginfo.si_band);
# ifdef si_fd
				add_assoc_long_ex(user_siginfo, "fd",   sizeof("fd"),   siginfo.si_fd);
# endif
				break;
#endif
			EMPTY_SWITCH_DEFAULT_CASE();
		}
	}
	
	RETURN_LONG(signo);
}
/* }}} */

/* {{{ proto int pcnlt_sigwaitinfo(array set[, array &siginfo])
   Synchronously wait for queued signals */
PHP_FUNCTION(pcntl_sigwaitinfo)
{
	pcntl_sigwaitinfo(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */

/* {{{ proto int pcntl_sigtimedwait(array set[, array &siginfo[, int seconds[, int nanoseconds]]])
   Wait for queued signals */
PHP_FUNCTION(pcntl_sigtimedwait)
{
	pcntl_sigwaitinfo(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */
#endif

#ifdef HAVE_GETPRIORITY
/* {{{ proto int pcntl_getpriority([int pid [, int process_identifier]])
   Get the priority of any process */
PHP_FUNCTION(pcntl_getpriority)
{
	long who = PRIO_PROCESS;
	long pid = getpid();
	int pri;
	
	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|ll", &pid, &who) == FAILURE) {
		RETURN_FALSE;
	}

	/* needs to be cleared, since any returned value is valid */ 
	errno = 0;

	pri = getpriority(who, pid);

	if (errno) {
		PCNTL_G(last_error) = errno;
		switch (errno) {
			case ESRCH:
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "Error %d: No process was located using the given parameters", errno);
				break;
			case EINVAL:
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "Error %d: Invalid identifier flag", errno);
				break;
			default:
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "Unknown error %d has occured", errno);
				break;
		}
		RETURN_FALSE;
	}

	RETURN_LONG(pri);
}
/* }}} */
#endif

#ifdef HAVE_SETPRIORITY
/* {{{ proto bool pcntl_setpriority(int priority [, int pid [, int process_identifier]])
   Change the priority of any process */
PHP_FUNCTION(pcntl_setpriority)
{
	long who = PRIO_PROCESS;
	long pid = getpid();
	long pri;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l|ll", &pri, &pid, &who) == FAILURE) {
		RETURN_FALSE;
	}

	if (setpriority(who, pid, pri)) {
		PCNTL_G(last_error) = errno;
		switch (errno) {
			case ESRCH:
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "Error %d: No process was located using the given parameters", errno);
				break;
			case EINVAL:
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "Error %d: Invalid identifier flag", errno);
				break;
			case EPERM:
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "Error %d: A process was located, but neither its effective nor real user ID matched the effective user ID of the caller", errno);
				break;
			case EACCES:
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "Error %d: Only a super user may attempt to increase the process priority", errno);
				break;
			default:
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "Unknown error %d has occured", errno);
				break;
		}
		RETURN_FALSE;
	}
	
	RETURN_TRUE;
}
/* }}} */
#endif

/* {{{ proto int pcntl_get_last_error(void)
   Retrieve the error number set by the last pcntl function which failed. */
PHP_FUNCTION(pcntl_get_last_error)
{
        RETURN_LONG(PCNTL_G(last_error));
}
/* }}} */

/* {{{ proto string pcntl_strerror(int errno)
   Retrieve the system error message associated with the given errno. */
PHP_FUNCTION(pcntl_strerror)
{
        long error;

        if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &error) == FAILURE) {
                RETURN_FALSE;
        }

        RETURN_STRING(strerror(error), 1);
}
/* }}} */

/* Our custom signal handler that calls the appropriate php_function */
static void pcntl_signal_handler(int signo)
{
	struct php_pcntl_pending_signal *psig;
	TSRMLS_FETCH();
	
	psig = PCNTL_G(spares);
	if (!psig) {
		/* oops, too many signals for us to track, so we'll forget about this one */
		return;
	}
	PCNTL_G(spares) = psig->next;

	psig->signo = signo;
	psig->next = NULL;

	/* the head check is important, as the tick handler cannot atomically clear both
	 * the head and tail */
	if (PCNTL_G(head) && PCNTL_G(tail)) {
		PCNTL_G(tail)->next = psig;
	} else {
		PCNTL_G(head) = psig;
	}
	PCNTL_G(tail) = psig;
}

void pcntl_signal_dispatch()
{
	zval *param, **handle, *retval;
	struct php_pcntl_pending_signal *queue, *next;
	sigset_t mask;
	sigset_t old_mask;
	TSRMLS_FETCH();
		
	/* Mask all signals */
	sigfillset(&mask);
	sigprocmask(SIG_BLOCK, &mask, &old_mask);

	/* Bail if the queue is empty or if we are already playing the queue*/
	if (! PCNTL_G(head) || PCNTL_G(processing_signal_queue)) {
		sigprocmask(SIG_SETMASK, &old_mask, NULL);
		return;
	}

	/* Prevent reentrant handler calls */
	PCNTL_G(processing_signal_queue) = 1;

	queue = PCNTL_G(head);
	PCNTL_G(head) = NULL; /* simple stores are atomic */
	
	/* Allocate */

	while (queue) {
		if (zend_hash_index_find(&PCNTL_G(php_signal_table), queue->signo, (void **) &handle)==SUCCESS) {
			MAKE_STD_ZVAL(retval);
			MAKE_STD_ZVAL(param);
			ZVAL_NULL(retval);
			ZVAL_LONG(param, queue->signo);

			/* Call php signal handler - Note that we do not report errors, and we ignore the return value */
			/* FIXME: this is probably broken when multiple signals are handled in this while loop (retval) */
			call_user_function(EG(function_table), NULL, *handle, retval, 1, &param TSRMLS_CC);
			zval_ptr_dtor(&param);
			zval_ptr_dtor(&retval);
		}

		next = queue->next;
		queue->next = PCNTL_G(spares);
		PCNTL_G(spares) = queue;
		queue = next;
	}

	/* Re-enable queue */
	PCNTL_G(processing_signal_queue) = 0;
	
	/* return signal mask to previous state */
	sigprocmask(SIG_SETMASK, &old_mask, NULL);
}



/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * indent-tabs-mode: t
 * End:
 */
