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/*
* Copyright (c) 2008, 2009, Wayne Meissner
* Copyright (C) 2009 Aman Gupta <aman@tmm1.net>
*
* Copyright (c) 2008-2013, Ruby FFI project contributors
* 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.
* * Neither the name of the Ruby FFI project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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 <COPYRIGHT HOLDER> 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 _MSC_VER
# include <sys/param.h>
#endif
#include <sys/types.h>
#include <stdio.h>
#ifndef _MSC_VER
# include <stdint.h>
# include <stdbool.h>
#else
# include "win32/stdbool.h"
#endif
#include <errno.h>
#include <ruby.h>
#include "LastError.h"
#if defined(HAVE_NATIVETHREAD) && !defined(_WIN32) && !defined(__WIN32__)
# include <pthread.h>
# define USE_PTHREAD_LOCAL
#endif
typedef struct ThreadData {
int td_errno;
} ThreadData;
#if defined(USE_PTHREAD_LOCAL)
static pthread_key_t threadDataKey;
#endif
static inline ThreadData* thread_data_get(void);
#if defined(USE_PTHREAD_LOCAL)
static ThreadData*
thread_data_init(void)
{
ThreadData* td = xcalloc(1, sizeof(ThreadData));
pthread_setspecific(threadDataKey, td);
return td;
}
static inline ThreadData*
thread_data_get(void)
{
ThreadData* td = pthread_getspecific(threadDataKey);
return td != NULL ? td : thread_data_init();
}
static void
thread_data_free(void *ptr)
{
xfree(ptr);
}
#else
static ID id_thread_data;
static ThreadData*
thread_data_init(void)
{
ThreadData* td;
VALUE obj;
obj = Data_Make_Struct(rb_cObject, ThreadData, NULL, -1, td);
rb_thread_local_aset(rb_thread_current(), id_thread_data, obj);
return td;
}
static inline ThreadData*
thread_data_get()
{
VALUE obj = rb_thread_local_aref(rb_thread_current(), id_thread_data);
if (obj != Qnil && TYPE(obj) == T_DATA) {
return (ThreadData *) DATA_PTR(obj);
}
return thread_data_init();
}
#endif
/*
* call-seq: error
* @return [Numeric]
* Get +errno+ value.
*/
static VALUE
get_last_error(VALUE self)
{
return INT2NUM(thread_data_get()->td_errno);
}
/*
* call-seq: error(error)
* @param [Numeric] error
* @return [nil]
* Set +errno+ value.
*/
static VALUE
set_last_error(VALUE self, VALUE error)
{
#ifdef _WIN32
SetLastError(NUM2INT(error));
#else
errno = NUM2INT(error);
#endif
return Qnil;
}
void
rbffi_save_errno(void)
{
int error = 0;
#ifdef _WIN32
error = GetLastError();
#else
error = errno;
#endif
thread_data_get()->td_errno = error;
}
void
rbffi_LastError_Init(VALUE moduleFFI)
{
/*
* Document-module: FFI::LastError
* This module defines a couple of method to set and get +errno+
* for current thread.
*/
VALUE moduleError = rb_define_module_under(moduleFFI, "LastError");
rb_define_module_function(moduleError, "error", get_last_error, 0);
rb_define_module_function(moduleError, "error=", set_last_error, 1);
#if defined(USE_PTHREAD_LOCAL)
pthread_key_create(&threadDataKey, thread_data_free);
#else
id_thread_data = rb_intern("ffi_thread_local_data");
#endif /* USE_PTHREAD_LOCAL */
}
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