path: root/erts/emulator/beam/sys.h

/*
 * %CopyrightBegin%
 *
 * Copyright Ericsson AB 1996-2013. All Rights Reserved.
 *
 * The contents of this file are subject to the Erlang Public License,
 * Version 1.1, (the "License"); you may not use this file except in
 * compliance with the License. You should have received a copy of the
 * Erlang Public License along with this software. If not, it can be
 * retrieved online at http://www.erlang.org/.
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * %CopyrightEnd%
 */

#ifndef __SYS_H__
#define __SYS_H__


#if defined(VALGRIND) && !defined(NO_FPE_SIGNALS)
#  define NO_FPE_SIGNALS
#endif

#ifdef DISABLE_CHILD_WAITER_THREAD
#undef ENABLE_CHILD_WAITER_THREAD
#endif

#if defined(ERTS_SMP) && !defined(DISABLE_CHILD_WAITER_THREAD)
#undef ENABLE_CHILD_WAITER_THREAD
#define ENABLE_CHILD_WAITER_THREAD 1
#endif

#define ERTS_I64_LITERAL(X) X##LL

#if defined (__WIN32__)
#  include "erl_win_sys.h"
#elif defined (__OSE__)
#  include "erl_ose_sys.h"
#else 
#  include "erl_unix_sys.h"
#ifndef UNIX
#  define UNIX 1
#endif
#endif

#include "erl_misc_utils.h"

/*
 * To allow building of Universal Binaries for Mac OS X,
 * we must not depend on the endian detected by the configure script.
 */
#if defined(__APPLE__)
#  if defined(__BIG_ENDIAN__) && !defined(WORDS_BIGENDIAN)
#    define WORDS_BIGENDIAN 1
#  elif !defined(__BIG_ENDIAN__) && defined(WORDS_BIGENDIAN)
#    undef WORDS_BIGENDIAN
#  endif
#endif

/*
 * Make sure we have a type for FD's (used by erl_check_io)
 */

#ifndef ERTS_SYS_FD_TYPE
typedef int ErtsSysFdType;
#else
typedef ERTS_SYS_FD_TYPE ErtsSysFdType;
#endif

#ifdef ERTS_INLINE
#  ifndef ERTS_CAN_INLINE
#    define ERTS_CAN_INLINE 1
#  endif
#else
#  if defined(__GNUC__)
#    define ERTS_CAN_INLINE 1
#    define ERTS_INLINE __inline__
#  elif defined(__WIN32__)
#    define ERTS_CAN_INLINE 1
#    define ERTS_INLINE __inline
#  else
#    define ERTS_CAN_INLINE 0
#    define ERTS_INLINE
#  endif
#endif

#if !defined(__GNUC__)
#  define ERTS_AT_LEAST_GCC_VSN__(MAJ, MIN, PL) 0
#elif !defined(__GNUC_MINOR__)
#  define ERTS_AT_LEAST_GCC_VSN__(MAJ, MIN, PL) \
  ((__GNUC__ << 24) >= (((MAJ) << 24) | ((MIN) << 12) | (PL)))
#elif !defined(__GNUC_PATCHLEVEL__)
#  define ERTS_AT_LEAST_GCC_VSN__(MAJ, MIN, PL) \
  (((__GNUC__ << 24) | (__GNUC_MINOR__ << 12)) >= (((MAJ) << 24) | ((MIN) << 12) | (PL)))
#else
#  define ERTS_AT_LEAST_GCC_VSN__(MAJ, MIN, PL) \
  (((__GNUC__ << 24) | (__GNUC_MINOR__ << 12) | __GNUC_PATCHLEVEL__) >= (((MAJ) << 24) | ((MIN) << 12) | (PL)))
#endif

#if ERTS_AT_LEAST_GCC_VSN__(2, 96, 0)
#  define ERTS_LIKELY(BOOL)   __builtin_expect((BOOL), !0)
#  define ERTS_UNLIKELY(BOOL) __builtin_expect((BOOL), 0)
#else
#  define ERTS_LIKELY(BOOL)   (BOOL)
#  define ERTS_UNLIKELY(BOOL) (BOOL)
#endif
#ifdef __GNUC__
#  if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 5)
#    define ERTS_DECLARE_DUMMY(X) X __attribute__ ((unused))
#  else
#    define ERTS_DECLARE_DUMMY(X) X
#  endif
#else
#  define ERTS_DECLARE_DUMMY(X) X
#endif

#if !defined(__func__)
#  if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901L
#    if !defined(__GNUC__) ||  __GNUC__ < 2
#      define __func__ "[unknown_function]"
#    else
#      define __func__ __FUNCTION__
#    endif
#  endif
#endif

#if defined(DEBUG) || defined(ERTS_ENABLE_LOCK_CHECK)
#  undef ERTS_CAN_INLINE
#  define ERTS_CAN_INLINE 0
#  undef ERTS_INLINE
#  define ERTS_INLINE
#endif

#if ERTS_CAN_INLINE
#define ERTS_GLB_INLINE static ERTS_INLINE
#else
#define ERTS_GLB_INLINE
#endif

#if ERTS_CAN_INLINE || defined(ERTS_DO_INCL_GLB_INLINE_FUNC_DEF) 
#  define ERTS_GLB_INLINE_INCL_FUNC_DEF 1
#else
#  define ERTS_GLB_INLINE_INCL_FUNC_DEF 0
#endif

#ifndef ERTS_EXIT_AFTER_DUMP
#  define ERTS_EXIT_AFTER_DUMP exit
#endif

/* In VC++, noreturn is a declspec that has to be before the types,
 * but in GNUC it is an att ribute to be placed between return type
 * and function name, hence __decl_noreturn <types> __noreturn <function name>
 *
 * at some platforms (e.g. Android) __noreturn is defined at sys/cdef.h
 */
#if __GNUC__
#  define __decl_noreturn
#  ifndef __noreturn
#     define __noreturn __attribute__((noreturn))
#  endif
#else
#  if defined(__WIN32__) && defined(_MSC_VER)
#    define __noreturn
#    define __decl_noreturn __declspec(noreturn)
#  else
#    define __noreturn
#    define __decl_noreturn
#  endif
#endif

#define ERTS_ASSERT(e) \
    ((void) ((e) ? 1 : (erl_assert_error(#e, __func__, __FILE__, __LINE__), 0)))

__decl_noreturn void __noreturn erl_assert_error(const char* expr, const char *func,
						 const char* file, int line);

#ifdef DEBUG
#  define ASSERT(e) ERTS_ASSERT(e)
#else
#  define ASSERT(e) ((void) 1)
#endif

/*
 * Microsoft C/C++: We certainly want to use stdarg.h and prototypes.
 * But MSC doesn't define __STDC__, unless we compile with the -Za
 * flag (strict ANSI C, no Microsoft extension).  Compiling with -Za
 * doesn't work: some Microsoft headers fail to compile...
 *
 * Solution: Test if __STDC__ or _MSC_VER is defined.
 *
 * Note: Simply defining __STDC__ doesn't work, as some Microsoft
 * headers will fail to compile!
 */

#include <stdarg.h>

/* This isn't sys-dependent, but putting it here benefits sys.c and drivers
   - allow use of 'const' regardless of compiler */

#if !defined(__STDC__) && !defined(_MSC_VER)
#  define const
#endif

#undef __deprecated
#if ERTS_AT_LEAST_GCC_VSN__(3, 0, 0)
#  define __deprecated __attribute__((deprecated))
#else
#  define __deprecated
#endif
#if ERTS_AT_LEAST_GCC_VSN__(3, 0, 4)
#  define erts_align_attribute(SZ) __attribute__ ((aligned (SZ)))
#else
#  define erts_align_attribute(SZ)
#endif

/*
** Data types:
**
** Eterm: A tagged erlang term (possibly 64 bits)
** BeamInstr: A beam code instruction unit, possibly larger than Eterm, not smaller.
** UInt:  An unsigned integer exactly as large as an Eterm.
** SInt:  A signed integer exactly as large as an eterm and therefor large
**        enough to hold the return value of the signed_val() macro.
** UWord: An unsigned integer at least as large as a void * and also as large
**          or larger than an Eterm
** SWord: A signed integer at least as large as a void * and also as large
**          or larger than an Eterm
** Uint32: An unsigned integer of 32 bits exactly
** Sint32: A signed integer of 32 bits exactly
** Uint16: An unsigned integer of 16 bits exactly
** Sint16: A signed integer of 16 bits exactly.
*/

#if !((SIZEOF_VOID_P >= 4) && (SIZEOF_VOID_P == SIZEOF_SIZE_T) \
      && ((SIZEOF_VOID_P == SIZEOF_INT) || (SIZEOF_VOID_P == SIZEOF_LONG) || \
          (SIZEOF_VOID_P == SIZEOF_LONG_LONG)))
#error Cannot handle this combination of int/long/void*/size_t sizes
#endif

#if SIZEOF_VOID_P == 8
#undef  ARCH_32
#define ARCH_64
#define ERTS_SIZEOF_TERM 8
#elif SIZEOF_VOID_P == 4
#define ARCH_32
#undef  ARCH_64
#define ERTS_SIZEOF_TERM 4
#else
#error Neither 32 nor 64 bit architecture
#endif
#if defined(ARCH_64) && defined(HALFWORD_HEAP_EMULATOR)
#    define HALFWORD_HEAP 1
#    define HALFWORD_ASSERT 0
#    define ASSERT_HALFWORD(COND) ASSERT(COND)
#    undef ERTS_SIZEOF_TERM
#    define ERTS_SIZEOF_TERM 4
#else
#    define HALFWORD_HEAP 0
#    define HALFWORD_ASSERT 0
#    define ASSERT_HALFWORD(COND)
#endif

#if SIZEOF_VOID_P != SIZEOF_SIZE_T
#error sizeof(void*) != sizeof(size_t)
#endif

#if HALFWORD_HEAP

#if SIZEOF_INT == 4
typedef unsigned int Eterm;
typedef unsigned int Uint;
typedef int          Sint;
#define ERTS_UINT_MAX UINT_MAX
#define ERTS_SIZEOF_ETERM SIZEOF_INT
#define ErtsStrToSint strtol
#else
#error Found no appropriate type to use for 'Eterm', 'Uint' and 'Sint'
#endif

#if SIZEOF_VOID_P == SIZEOF_LONG
typedef unsigned long UWord;
typedef long          SWord;
#define SWORD_CONSTANT(Const) Const##L
#define UWORD_CONSTANT(Const) Const##UL
#define ERTS_UWORD_MAX ULONG_MAX
#define ERTS_SWORD_MAX LONG_MAX
#elif SIZEOF_VOID_P == SIZEOF_INT
typedef unsigned int UWord;
typedef int          SWord;
#define SWORD_CONSTANT(Const) Const
#define UWORD_CONSTANT(Const) Const##U
#define ERTS_UWORD_MAX UINT_MAX
#define ERTS_SWORD_MAX INT_MAX
#elif SIZEOF_VOID_P == SIZEOF_LONG_LONG
typedef unsigned long long UWord;
typedef long long          SWord;
#define SWORD_CONSTANT(Const) Const##LL
#define UWORD_CONSTANT(Const) Const##ULL
#define ERTS_UWORD_MAX ULLONG_MAX
#define ERTS_SWORD_MAX LLONG_MAX
#else
#error Found no appropriate type to use for 'Eterm', 'Uint' and 'Sint'
#endif

#else /* !HALFWORD_HEAP */

#if SIZEOF_VOID_P == SIZEOF_LONG
typedef unsigned long Eterm;
typedef unsigned long Uint;
typedef long          Sint;
#define SWORD_CONSTANT(Const) Const##L
#define UWORD_CONSTANT(Const) Const##UL
#define ERTS_UWORD_MAX ULONG_MAX
#define ERTS_SWORD_MAX LONG_MAX
#define ERTS_SIZEOF_ETERM SIZEOF_LONG
#define ErtsStrToSint strtol
#elif SIZEOF_VOID_P == SIZEOF_INT
typedef unsigned int Eterm;
typedef unsigned int Uint;
typedef int          Sint;
#define SWORD_CONSTANT(Const) Const
#define UWORD_CONSTANT(Const) Const##U
#define ERTS_UWORD_MAX UINT_MAX
#define ERTS_SWORD_MAX INT_MAX
#define ERTS_SIZEOF_ETERM SIZEOF_INT
#define ErtsStrToSint strtol
#elif SIZEOF_VOID_P == SIZEOF_LONG_LONG
typedef unsigned long long Eterm;
typedef unsigned long long Uint;
typedef long long          Sint;
#define SWORD_CONSTANT(Const) Const##LL
#define UWORD_CONSTANT(Const) Const##ULL
#define ERTS_UWORD_MAX ULLONG_MAX
#define ERTS_SWORD_MAX LLONG_MAX
#define ERTS_SIZEOF_ETERM SIZEOF_LONG_LONG
#if defined(__WIN32__)
#define ErtsStrToSint _strtoi64
#else
#define ErtsStrToSint strtoll
#endif
#else
#error Found no appropriate type to use for 'Eterm', 'Uint' and 'Sint'
#endif

typedef Uint UWord;
typedef Sint SWord;
#define ERTS_UINT_MAX ERTS_UWORD_MAX

#endif /* HALFWORD_HEAP */

typedef UWord BeamInstr;

#ifndef HAVE_INT64
#if SIZEOF_LONG == 8
#define HAVE_INT64 1
typedef unsigned long Uint64;
typedef long          Sint64;
#elif SIZEOF_LONG_LONG == 8
#define HAVE_INT64 1
typedef unsigned long long Uint64;
typedef long long          Sint64;
#else
#define HAVE_INT64 0
#endif
#endif

#if SIZEOF_LONG == 4
typedef unsigned long Uint32;
typedef long          Sint32;
#elif SIZEOF_INT == 4
typedef unsigned int Uint32;
typedef int          Sint32;
#else
#error Found no appropriate type to use for 'Uint32' and 'Sint32'
#endif

#if SIZEOF_INT == 2
typedef unsigned int Uint16;
typedef int          Sint16;
#elif SIZEOF_SHORT == 2
typedef unsigned short Uint16;
typedef short          Sint16;
#else
#error Found no appropriate type to use for 'Uint16' and 'Sint16'
#endif

#if CHAR_BIT == 8
typedef unsigned char byte;
#else
#error Found no appropriate type to use for 'byte'
#endif

#if defined(ARCH_64) && !HAVE_INT64
#error 64-bit architecture, but no appropriate type to use for Uint64 and Sint64 found 
#endif

#ifdef WORDS_BIGENDIAN
#  define ERTS_HUINT_HVAL_HIGH 0
#  define ERTS_HUINT_HVAL_LOW 1
#else
#  define ERTS_HUINT_HVAL_HIGH 1
#  define ERTS_HUINT_HVAL_LOW 0
#endif
#if ERTS_SIZEOF_TERM == 8
typedef union {
    Uint val;
    Uint32 hval[2];
} HUint;
#elif ERTS_SIZEOF_TERM == 4
typedef union {
    Uint val;
    Uint16 hval[2];
} HUint;
#else
#error "Unsupported size of term"
#endif

#  define ERTS_EXTRA_DATA_ALIGN_SZ(X) \
    (((size_t) 8) - (((size_t) (X)) & ((size_t) 7)))

#include "erl_lock_check.h"

/* needed by erl_smp.h */
int erts_send_warning_to_logger_str_nogl(char *);

#include "erl_smp.h"

#ifdef ERTS_WANT_BREAK_HANDLING
#  ifdef ERTS_SMP
extern erts_smp_atomic32_t erts_break_requested;
#    define ERTS_BREAK_REQUESTED \
  ((int) erts_smp_atomic32_read_nob(&erts_break_requested))
#  else
extern volatile int erts_break_requested;
#    define ERTS_BREAK_REQUESTED erts_break_requested
#  endif
void erts_do_break_handling(void);
#endif

#ifdef ERTS_WANT_GOT_SIGUSR1
#  ifndef UNIX
#    define ERTS_GOT_SIGUSR1 0
#  else
#    ifdef ERTS_SMP
extern erts_smp_atomic32_t erts_got_sigusr1;
#      define ERTS_GOT_SIGUSR1 ((int) erts_smp_atomic32_read_mb(&erts_got_sigusr1))
#    else
extern volatile int erts_got_sigusr1;
#      define ERTS_GOT_SIGUSR1 erts_got_sigusr1
#    endif
#  endif
#endif

#ifdef ERTS_SMP
extern erts_smp_atomic32_t erts_writing_erl_crash_dump;
extern erts_tsd_key_t erts_is_crash_dumping_key;
#define ERTS_SOMEONE_IS_CRASH_DUMPING \
  ((int) erts_smp_atomic32_read_mb(&erts_writing_erl_crash_dump))
#define ERTS_IS_CRASH_DUMPING \
  ((int) (SWord) erts_tsd_get(erts_is_crash_dumping_key))
#else
extern volatile int erts_writing_erl_crash_dump;
#define ERTS_SOMEONE_IS_CRASH_DUMPING erts_writing_erl_crash_dump
#define ERTS_IS_CRASH_DUMPING erts_writing_erl_crash_dump
#endif

/* Deal with memcpy() vs bcopy() etc. We want to use the mem*() functions,
   but be able to fall back on bcopy() etc on systems that don't have
   mem*(), but this doesn't work to well with memset()/bzero() - thus the
   memzero() macro.
*/

/* xxxP */
#if defined(USE_BCOPY)
#  define memcpy(a, b, c) bcopy((b), (a), (c))
#  define memcmp(a, b, c) bcmp((a), (b), (c))
#  define memzero(buf, len) bzero((buf), (len))
#else
#  define memzero(buf, len) memset((buf), '\0', (len))
#endif

/* Stuff that is useful for port programs, drivers, etc */

#ifdef ISC32			/* Too much for the Makefile... */
#  define signal	sigset
#  define NO_ASINH
#  define NO_ACOSH
#  define NO_ATANH
#  define NO_FTRUNCATE
#  define SIG_SIGHOLD
#  define _POSIX_SOURCE 
#  define _XOPEN_SOURCE
#endif

#ifdef QNX			/* Too much for the Makefile... */
#  define SYS_SELECT_H
#  define NO_ERF
#  define NO_ERFC
/* This definition doesn't take NaN into account, but matherr() gets those */
#  define isfinite(x) (fabs(x) != HUGE_VAL)
#  define USE_MATHERR
#  define HAVE_FINITE
#endif


#ifdef WANT_NONBLOCKING	    /* must define this to pull in fcntl.h/ioctl.h */

/* This is really a mess... We used to use fcntl O_NDELAY, but that seems
   to only work on SunOS 4 - in particular, on SysV-based systems
   (including Solaris 2), it does set non-blocking mode, but causes
   read() to return 0!!  fcntl O_NONBLOCK is specified by POSIX, and
   seems to work on most systems, with the notable exception of AIX,
   where the old ioctl FIONBIO is the *only* one that will set a *socket*
   in non-blocking mode - and ioctl FIONBIO on AIX *doesn't* work for
   pipes or ttys (O_NONBLOCK does)!!! For now, we'll use FIONBIO for AIX. */

#  ifdef __WIN32__

static unsigned long zero_value = 0, one_value = 1;
#    define SET_BLOCKING(fd)	{ if (ioctlsocket((fd), FIONBIO, &zero_value) != 0) fprintf(stderr, "Error setting socket to non-blocking: %d\n", WSAGetLastError()); }
#    define SET_NONBLOCKING(fd)	ioctlsocket((fd), FIONBIO, &one_value)

#  else
#    ifdef NB_FIONBIO		/* Old BSD */
#      include <sys/ioctl.h>
  static const int zero_value = 0, one_value = 1;
#      define SET_BLOCKING(fd)         ioctl((fd), FIONBIO, &zero_value)
#      define SET_NONBLOCKING(fd)      ioctl((fd), FIONBIO, &one_value)
#      define ERRNO_BLOCK EWOULDBLOCK
#    else /* !NB_FIONBIO */
#      include <fcntl.h>
#      ifdef NB_O_NDELAY               /* Nothing needs this? */
#        define NB_FLAG O_NDELAY
#        ifndef ERRNO_BLOCK            /* allow override (e.g. EAGAIN) via Makefile */
#          define ERRNO_BLOCK EWOULDBLOCK
#        endif
#      else  /* !NB_O_NDELAY */	/* The True Way - POSIX!:-) */
#        define NB_FLAG O_NONBLOCK
#        define ERRNO_BLOCK EAGAIN
#      endif /* !NB_O_NDELAY */
#      define SET_BLOCKING(fd)         fcntl((fd), F_SETFL, \
                                           fcntl((fd), F_GETFL, 0) & ~NB_FLAG)
#      define SET_NONBLOCKING(fd)      fcntl((fd), F_SETFL, \
                                           fcntl((fd), F_GETFL, 0) | NB_FLAG)
#    endif /* !NB_FIONBIO */
#  endif /* !__WIN32__ */
#endif /* WANT_NONBLOCKING */

__decl_noreturn void __noreturn erl_exit(int n, char*, ...);

/* Some special erl_exit() codes: */
#define ERTS_INTR_EXIT	INT_MIN		/* called from signal handler */
#define ERTS_ABORT_EXIT	(INT_MIN + 1)	/* no crash dump; only abort() */
#define ERTS_DUMP_EXIT	(INT_MIN + 2)	/* crash dump; then exit() */

#define ERTS_INTERNAL_ERROR(What) \
    erl_exit(ERTS_ABORT_EXIT, "%s:%d:%s(): Internal error: %s\n", \
	     __FILE__, __LINE__, __func__, What)

Eterm erts_check_io_info(void *p);

/* Size of misc memory allocated from system dependent code */
Uint erts_sys_misc_mem_sz(void);

/* print stuff is declared here instead of in global.h, so sys stuff won't
   have to include global.h */
#include "erl_printf.h"

/* Io constants to erts_print and erts_putc */
#define ERTS_PRINT_STDERR	(2)
#define ERTS_PRINT_STDOUT	(1)
#define ERTS_PRINT_INVALID	(0) /* Don't want to use 0 since CBUF was 0 */
#define ERTS_PRINT_FILE		(-1)
#define ERTS_PRINT_SBUF		(-2)
#define ERTS_PRINT_SNBUF	(-3)
#define ERTS_PRINT_DSBUF	(-4)

#define ERTS_PRINT_MIN		ERTS_PRINT_DSBUF

typedef struct {
    char *buf;
    size_t size;
} erts_print_sn_buf;

int erts_print(int to, void *arg, char *format, ...);	/* in utils.c */
int erts_putc(int to, void *arg, char);			/* in utils.c */

/* logger stuff is declared here instead of in global.h, so sys files
   won't have to include global.h */

erts_dsprintf_buf_t *erts_create_logger_dsbuf(void);
int erts_send_info_to_logger(Eterm, erts_dsprintf_buf_t *);
int erts_send_warning_to_logger(Eterm, erts_dsprintf_buf_t *);
int erts_send_error_to_logger(Eterm, erts_dsprintf_buf_t *);
int erts_send_info_to_logger_str(Eterm, char *); 
int erts_send_warning_to_logger_str(Eterm, char *);
int erts_send_error_to_logger_str(Eterm, char *);
int erts_send_info_to_logger_nogl(erts_dsprintf_buf_t *);
int erts_send_warning_to_logger_nogl(erts_dsprintf_buf_t *);
int erts_send_error_to_logger_nogl(erts_dsprintf_buf_t *);
int erts_send_info_to_logger_str_nogl(char *);
/* needed by erl_smp.h (declared above)
   int erts_send_warning_to_logger_str_nogl(char *); */
int erts_send_error_to_logger_str_nogl(char *);

typedef struct preload {
    char *name;			/* Name of module */
    int  size;			/* Size of code */
    unsigned char* code;	/* Code pointer */
} Preload;


/*
 * This structure contains options to all built in drivers.
 * None of the drivers use all of the fields.
 */

typedef struct _SysDriverOpts {
    Uint ifd;			/* Input file descriptor (fd driver). */
    Uint ofd;			/* Outputfile descriptor (fd driver). */
    int packet_bytes;		/* Number of bytes in packet header. */
    int read_write;		/* Read and write bits. */
    int use_stdio;		/* Use standard I/O: TRUE or FALSE. */
    int redir_stderr;           /* Redirect stderr to stdout: TRUE/FALSE. */
    int hide_window;		/* Hide this windows (Windows). */
    int exit_status;		/* Report exit status of subprocess. */
    int overlapped_io;          /* Only has effect on windows NT et al */
    char *envir;		/* Environment of the port process, */
				/* in Windows format. */
    char **argv;                /* Argument vector in Unix'ish format. */
    char *wd;			/* Working directory. */
    unsigned spawn_type;        /* Bitfield of ERTS_SPAWN_DRIVER | 
				   ERTS_SPAWN_EXTERNAL | both*/ 
    int parallelism;            /* Optimize for parallelism */
} SysDriverOpts;

extern char *erts_default_arg0;

extern char os_type[];

extern int sys_init_time(void);
extern void erts_deliver_time(void);
extern void erts_time_remaining(SysTimeval *);
extern int erts_init_time_sup(void);
extern void erts_sys_init_float(void);
extern void erts_thread_init_float(void);
extern void erts_thread_disable_fpe(void);

ERTS_GLB_INLINE int erts_block_fpe(void);
ERTS_GLB_INLINE void erts_unblock_fpe(int);

#if ERTS_GLB_INLINE_INCL_FUNC_DEF

ERTS_GLB_INLINE int erts_block_fpe(void)
{
    return erts_sys_block_fpe();
}

ERTS_GLB_INLINE void erts_unblock_fpe(int unmasked)
{
    erts_sys_unblock_fpe(unmasked);
}

#endif /* #if ERTS_GLB_INLINE_INCL_FUNC_DEF */


/* Dynamic library/driver loading */
typedef struct {
    char* str;
}ErtsSysDdllError;
#define ERTS_SYS_DDLL_ERROR_INIT {NULL}
extern void erts_sys_ddll_free_error(ErtsSysDdllError*);
extern void erl_sys_ddll_init(void); /* to initialize mutexes etc */
extern int erts_sys_ddll_open(const char *path, void **handle, ErtsSysDdllError*);
extern int erts_sys_ddll_open_noext(char *path, void **handle, ErtsSysDdllError*);
extern int erts_sys_ddll_load_driver_init(void *handle, void **function);
extern int erts_sys_ddll_load_nif_init(void *handle, void **function,ErtsSysDdllError*);
extern int erts_sys_ddll_close2(void *handle, ErtsSysDdllError*);
#define erts_sys_ddll_close(H) erts_sys_ddll_close2(H,NULL)
extern void *erts_sys_ddll_call_init(void *function);
extern void *erts_sys_ddll_call_nif_init(void *function);
extern int erts_sys_ddll_sym2(void *handle, const char *name, void **function, ErtsSysDdllError*);
#define erts_sys_ddll_sym(H,N,F) erts_sys_ddll_sym2(H,N,F,NULL)
extern char *erts_sys_ddll_error(int code);



/*
 * System interfaces for startup.
 */
#include "erl_time.h"

void erts_sys_schedule_interrupt(int set);
#ifdef ERTS_SMP
void erts_sys_schedule_interrupt_timed(int set, erts_short_time_t msec);
void erts_sys_main_thread(void);
#endif

extern int erts_sys_prepare_crash_dump(int secs);
extern void erts_sys_pre_init(void);
extern void erl_sys_init(void);
extern void erl_sys_args(int *argc, char **argv);
extern void erl_sys_schedule(int);
void sys_tty_reset(int);

int sys_max_files(void);
void sys_init_io(void);
Preload* sys_preloaded(void);
unsigned char* sys_preload_begin(Preload*);
void sys_preload_end(Preload*);
int sys_get_key(int);
void elapsed_time_both(UWord *ms_user, UWord *ms_sys, 
		       UWord *ms_user_diff, UWord *ms_sys_diff);
void wall_clock_elapsed_time_both(UWord *ms_total, 
				  UWord *ms_diff);
void get_time(int *hour, int *minute, int *second);
void get_date(int *year, int *month, int *day);
void get_localtime(int *year, int *month, int *day, 
		   int *hour, int *minute, int *second);
void get_universaltime(int *year, int *month, int *day, 
		       int *hour, int *minute, int *second);
int seconds_to_univ(Sint64 seconds, 
		    Sint *year, Sint *month, Sint *day, 
		    Sint *hour, Sint *minute, Sint *second);
int univ_to_seconds(Sint year, Sint month, Sint day, 
		    Sint hour, Sint minute, Sint second,
		    Sint64* seconds);
int univ_to_local(
    Sint *year, Sint *month, Sint *day, 
		  Sint *hour, Sint *minute, Sint *second);
int local_to_univ(Sint *year, Sint *month, Sint *day, 
		  Sint *hour, Sint *minute, Sint *second, int isdst);
void get_now(Uint*, Uint*, Uint*);
void get_sys_now(Uint*, Uint*, Uint*);
void set_break_quit(void (*)(void), void (*)(void));

void os_flavor(char*, unsigned);
void os_version(int*, int*, int*);
void init_getenv_state(GETENV_STATE *);
char * getenv_string(GETENV_STATE *);
void fini_getenv_state(GETENV_STATE *);

/* xxxP */
#define SYS_DEFAULT_FLOAT_DECIMALS 20
void init_sys_float(void);
int sys_chars_to_double(char*, double*);
int sys_double_to_chars(double, char*, size_t);
int sys_double_to_chars_ext(double, char*, size_t, size_t);
int sys_double_to_chars_fast(double, char*, int, int, int);
void sys_get_pid(char *, size_t);

/* erts_sys_putenv() returns, 0 on success and a value != 0 on failure. */
int erts_sys_putenv(char *key, char *value);
/* Simple variant used from drivers, raw eightbit interface */
int erts_sys_putenv_raw(char *key, char *value);
/* erts_sys_getenv() returns 0 on success (length of value string in
   *size), a value > 0 if value buffer is too small (*size is set to needed
   size), and a value < 0 on failure. */
int erts_sys_getenv(char *key, char *value, size_t *size);
/* Simple variant used from drivers, raw eightbit interface */
int erts_sys_getenv_raw(char *key, char *value, size_t *size);
/* erts_sys_getenv__() is only allowed to be used in early init phase */
int erts_sys_getenv__(char *key, char *value, size_t *size);
/* erst_sys_unsetenv() returns 0 on success and a value != 0 on failure. */
int erts_sys_unsetenv(char *key);

/* Easier to use, but not as efficient, environment functions */
char *erts_read_env(char *key);
void erts_free_read_env(void *value);

/* utils.c */

/* Options to sys_alloc_opt */
#define SYS_ALLOC_OPT_TRIM_THRESHOLD 0
#define SYS_ALLOC_OPT_TOP_PAD        1
#define SYS_ALLOC_OPT_MMAP_THRESHOLD 2
#define SYS_ALLOC_OPT_MMAP_MAX       3

/* Default values to sys_alloc_opt options */
#define ERTS_DEFAULT_TRIM_THRESHOLD  (128 * 1024)
#define ERTS_DEFAULT_TOP_PAD         0
#define ERTS_DEFAULT_MMAP_THRESHOLD  (128 * 1024)
#define ERTS_DEFAULT_MMAP_MAX        64

int sys_alloc_opt(int, int);

typedef struct {
  int trim_threshold;
  int top_pad;
  int mmap_threshold;
  int mmap_max;
} SysAllocStat;

void sys_alloc_stat(SysAllocStat *);

#if defined(DEBUG) || defined(ERTS_ENABLE_LOCK_CHECK)
#undef ERTS_REFC_DEBUG
#define ERTS_REFC_DEBUG
#endif

typedef erts_smp_atomic_t erts_refc_t;

ERTS_GLB_INLINE void erts_refc_init(erts_refc_t *refcp, erts_aint_t val);
ERTS_GLB_INLINE void erts_refc_inc(erts_refc_t *refcp, erts_aint_t min_val);
ERTS_GLB_INLINE erts_aint_t erts_refc_inctest(erts_refc_t *refcp,
					      erts_aint_t min_val);
ERTS_GLB_INLINE void erts_refc_dec(erts_refc_t *refcp, erts_aint_t min_val);
ERTS_GLB_INLINE erts_aint_t erts_refc_dectest(erts_refc_t *refcp,
					      erts_aint_t min_val);
ERTS_GLB_INLINE void erts_refc_add(erts_refc_t *refcp, erts_aint_t diff,
				   erts_aint_t min_val);
ERTS_GLB_INLINE erts_aint_t erts_refc_read(erts_refc_t *refcp,
					   erts_aint_t min_val);

#if ERTS_GLB_INLINE_INCL_FUNC_DEF

ERTS_GLB_INLINE void
erts_refc_init(erts_refc_t *refcp, erts_aint_t val)
{
    erts_smp_atomic_init_nob((erts_smp_atomic_t *) refcp, val);
}

ERTS_GLB_INLINE void
erts_refc_inc(erts_refc_t *refcp, erts_aint_t min_val)
{
#ifdef ERTS_REFC_DEBUG
    erts_aint_t val = erts_smp_atomic_inc_read_nob((erts_smp_atomic_t *) refcp);
    if (val < min_val)
	erl_exit(ERTS_ABORT_EXIT,
		 "erts_refc_inc(): Bad refc found (refc=%ld < %ld)!\n",
		 val, min_val);
#else
    erts_smp_atomic_inc_nob((erts_smp_atomic_t *) refcp);
#endif
}

ERTS_GLB_INLINE erts_aint_t
erts_refc_inctest(erts_refc_t *refcp, erts_aint_t min_val)
{
    erts_aint_t val = erts_smp_atomic_inc_read_nob((erts_smp_atomic_t *) refcp);
#ifdef ERTS_REFC_DEBUG
    if (val < min_val)
	erl_exit(ERTS_ABORT_EXIT,
		 "erts_refc_inctest(): Bad refc found (refc=%ld < %ld)!\n",
		 val, min_val);
#endif
    return val;
}

ERTS_GLB_INLINE void
erts_refc_dec(erts_refc_t *refcp, erts_aint_t min_val)
{
#ifdef ERTS_REFC_DEBUG
    erts_aint_t val = erts_smp_atomic_dec_read_nob((erts_smp_atomic_t *) refcp);
    if (val < min_val)
	erl_exit(ERTS_ABORT_EXIT,
		 "erts_refc_dec(): Bad refc found (refc=%ld < %ld)!\n",
		 val, min_val);
#else
    erts_smp_atomic_dec_nob((erts_smp_atomic_t *) refcp);
#endif
}

ERTS_GLB_INLINE erts_aint_t
erts_refc_dectest(erts_refc_t *refcp, erts_aint_t min_val)
{
    erts_aint_t val = erts_smp_atomic_dec_read_nob((erts_smp_atomic_t *) refcp);
#ifdef ERTS_REFC_DEBUG
    if (val < min_val)
	erl_exit(ERTS_ABORT_EXIT,
		 "erts_refc_dectest(): Bad refc found (refc=%ld < %ld)!\n",
		 val, min_val);
#endif
    return val;
}

ERTS_GLB_INLINE void
erts_refc_add(erts_refc_t *refcp, erts_aint_t diff, erts_aint_t min_val)
{
#ifdef ERTS_REFC_DEBUG
    erts_aint_t val = erts_smp_atomic_add_read_nob((erts_smp_atomic_t *) refcp, diff);
    if (val < min_val)
	erl_exit(ERTS_ABORT_EXIT,
		 "erts_refc_add(%ld): Bad refc found (refc=%ld < %ld)!\n",
		 diff, val, min_val);
#else
    erts_smp_atomic_add_nob((erts_smp_atomic_t *) refcp, diff);
#endif
}

ERTS_GLB_INLINE erts_aint_t
erts_refc_read(erts_refc_t *refcp, erts_aint_t min_val)
{
    erts_aint_t val = erts_smp_atomic_read_nob((erts_smp_atomic_t *) refcp);
#ifdef ERTS_REFC_DEBUG
    if (val < min_val)
	erl_exit(ERTS_ABORT_EXIT,
		 "erts_refc_read(): Bad refc found (refc=%ld < %ld)!\n",
		 val, min_val);
#endif
    return val;
}

#endif /* #if ERTS_GLB_INLINE_INCL_FUNC_DEF */

#ifdef ERTS_ENABLE_KERNEL_POLL
extern int erts_use_kernel_poll;
#endif

#define sys_memcpy(s1,s2,n)  memcpy(s1,s2,n)
#define sys_memmove(s1,s2,n) memmove(s1,s2,n)
#define sys_memcmp(s1,s2,n)  memcmp(s1,s2,n)
#define sys_memset(s,c,n)    memset(s,c,n)
#define sys_memzero(s, n)    memset(s,'\0',n)
#define sys_strcmp(s1,s2)    strcmp(s1,s2)
#define sys_strncmp(s1,s2,n) strncmp(s1,s2,n)
#define sys_strcpy(s1,s2)    strcpy(s1,s2)
#define sys_strncpy(s1,s2,n) strncpy(s1,s2,n)
#define sys_strlen(s)        strlen(s)

/* define function symbols (needed in sys_drv_api) */
#define sys_fp_alloc     sys_alloc
#define sys_fp_realloc   sys_realloc
#define sys_fp_free      sys_free
#define sys_fp_memcpy    memcpy
#define sys_fp_memmove   memmove
#define sys_fp_memcmp    memcmp
#define sys_fp_memset    memset
/* #define sys_fp_memzero    elib_memzero */
#define sys_fp_strcmp    strcmp
#define sys_fp_strncmp   strncmp
#define sys_fp_strcpy    strcpy
#define sys_fp_strncpy   strncpy
#define sys_fp_strlen    strlen


/* Return codes from the nb_read and nb_write functions */
#define FD_READY 1
#define FD_CONTINUE 2
#define FD_ERROR 3



/* Standard set of integer macros  .. */

#define get_int64(s) (((Uint64)(((unsigned char*) (s))[0]) << 56) | \
                      (((Uint64)((unsigned char*) (s))[1]) << 48) | \
                      (((Uint64)((unsigned char*) (s))[2]) << 40) | \
                      (((Uint64)((unsigned char*) (s))[3]) << 32) | \
                      (((Uint64)((unsigned char*) (s))[4]) << 24) | \
                      (((Uint64)((unsigned char*) (s))[5]) << 16) | \
                      (((Uint64)((unsigned char*) (s))[6]) << 8)  | \
                      (((Uint64)((unsigned char*) (s))[7])))

#define put_int64(i, s) do {((char*)(s))[0] = (char)((Sint64)(i) >> 56) & 0xff;\
                            ((char*)(s))[1] = (char)((Sint64)(i) >> 48) & 0xff;\
                            ((char*)(s))[2] = (char)((Sint64)(i) >> 40) & 0xff;\
                            ((char*)(s))[3] = (char)((Sint64)(i) >> 32) & 0xff;\
                            ((char*)(s))[4] = (char)((Sint64)(i) >> 24) & 0xff;\
                            ((char*)(s))[5] = (char)((Sint64)(i) >> 16) & 0xff;\
                            ((char*)(s))[6] = (char)((Sint64)(i) >> 8)  & 0xff;\
                            ((char*)(s))[7] = (char)((Sint64)(i))       & 0xff;\
                           } while (0) 

#define get_int32(s) ((((unsigned char*) (s))[0] << 24) | \
                      (((unsigned char*) (s))[1] << 16) | \
                      (((unsigned char*) (s))[2] << 8)  | \
                      (((unsigned char*) (s))[3]))

#define put_int32(i, s) do {((char*)(s))[0] = (char)((i) >> 24) & 0xff;   \
                            ((char*)(s))[1] = (char)((i) >> 16) & 0xff;   \
                            ((char*)(s))[2] = (char)((i) >> 8)  & 0xff;   \
                            ((char*)(s))[3] = (char)(i)         & 0xff;} \
                        while (0)

#define get_int24(s) ((((unsigned char*) (s))[0] << 16) | \
                      (((unsigned char*) (s))[1] << 8)  | \
                      (((unsigned char*) (s))[2]))

#define put_int24(i, s) do {((char*)(s))[0] = (char)((i) >> 16) & 0xff;  \
                            ((char*)(s))[1] = (char)((i) >> 8)  & 0xff;  \
                            ((char*)(s))[2] = (char)(i)         & 0xff;} \
                        while (0)

#define get_int16(s) ((((unsigned char*)  (s))[0] << 8) | \
                      (((unsigned char*)  (s))[1]))


#define put_int16(i, s) do {((char*)(s))[0] = (char)((i) >> 8) & 0xff;  \
                            ((char*)(s))[1] = (char)(i)        & 0xff;} \
                        while (0)

#define get_int8(s) ((((unsigned char*)  (s))[0] ))


#define put_int8(i, s) do {((unsigned char*)(s))[0] = (i) & 0xff;} while (0)


/*
 * Use DEBUGF as you would use printf, but use double parentheses:
 *
 *   DEBUGF(("Error: %s\n", error));
 *
 * The output will appear in a special console.
 */

#ifdef DEBUG
void erl_debug(char* format, ...);
void erl_bin_write(unsigned char *, int, int);

#  define DEBUGF(x) erl_debug x
#else
#  define DEBUGF(x)
#endif

#ifdef __WIN32__
#ifdef ARCH_64
#define ERTS_ALLOC_ALIGN_BYTES 16
#define ERTS_SMALL_ABS(Small) _abs64(Small) 
#else
#define ERTS_ALLOC_ALIGN_BYTES 8
#define ERTS_SMALL_ABS(Small) labs(Small) 
#endif
#else
#define ERTS_ALLOC_ALIGN_BYTES 8
#define ERTS_SMALL_ABS(Small) labs(Small) 
#endif

#ifndef ERTS_HAVE_ERTS_SYS_ALIGNED_ALLOC
#  define ERTS_HAVE_ERTS_SYS_ALIGNED_ALLOC 0
#endif

#ifdef __WIN32__
void call_break_handler(void);
char* last_error(void);
char* win32_errorstr(int);
#endif

/************************************************************************
 * Find out the native filename encoding of the process (look at locale of 
 * Unix processes and just do UTF16 on windows 
 ************************************************************************/
#define ERL_FILENAME_UNKNOWN   (0)
#define ERL_FILENAME_LATIN1    (1)
#define ERL_FILENAME_UTF8      (2)
#define ERL_FILENAME_UTF8_MAC  (3)
#define ERL_FILENAME_WIN_WCHAR (4)

/************************************************************************
 * If a filename in for example list_dir is not in the right encoding, it
 * will be skipped in the resulting list, but depending on a startup setting
 * we will inform the user in different ways. These macros define the
 * different reactions to wrongly coded filenames. In the error case an
 * exception will be thrown by prim_file.
 ************************************************************************/
#define ERL_FILENAME_WARNING_WARNING (0)
#define ERL_FILENAME_WARNING_IGNORE (1)
#define ERL_FILENAME_WARNING_ERROR (2)

/***********************************************************************
 * The user can request a range of character that he/she consider
 * printable. Currently this can be either latin1 or unicode, but
 * in the future a set of ranges, or languages, could be specified.
 ***********************************************************************/
#define ERL_PRINTABLE_CHARACTERS_LATIN1 (0)
#define ERL_PRINTABLE_CHARACTERS_UNICODE (1)

int erts_get_native_filename_encoding(void);
/* The set function is only to be used by erl_init! */
void erts_set_user_requested_filename_encoding(int encoding, int warning);
int erts_get_user_requested_filename_encoding(void);
int erts_get_filename_warning_type(void);
/* This function is called from erl_init. The setting is read by BIF's 
   in io/io_lib. Setting is not atomic. */
void erts_set_printable_characters(int range);
/* Get the setting (ERL_PRINTABLE_CHARACTERS_{LATIN1|UNICODE} */
int erts_get_printable_characters(void);

void erts_init_sys_common_misc(void);

#endif