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drm/linux/tdfx_drv.c

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/* tdfx.c -- tdfx driver -*- linux-c -*-
* Created: Thu Oct 7 10:38:32 1999 by faith@precisioninsight.com
*
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Authors:
* Rickard E. (Rik) Faith <faith@valinux.com>
* Daryll Strauss <daryll@valinux.com>
*
*/
#include <linux/config.h>
#include "drmP.h"
#include "tdfx_drv.h"
#define TDFX_NAME "tdfx"
#define TDFX_DESC "3dfx Banshee/Voodoo3+"
#define TDFX_DATE "20000719"
#define TDFX_MAJOR 1
#define TDFX_MINOR 0
#define TDFX_PATCHLEVEL 0
static drm_device_t tdfx_device;
drm_ctx_t tdfx_res_ctx;
static struct file_operations tdfx_fops = {
#if LINUX_VERSION_CODE >= 0x020400
/* This started being used during 2.4.0-test */
owner: THIS_MODULE,
#endif
open: tdfx_open,
flush: drm_flush,
release: tdfx_release,
ioctl: tdfx_ioctl,
mmap: drm_mmap,
read: drm_read,
fasync: drm_fasync,
poll: drm_poll,
};
static struct miscdevice tdfx_misc = {
minor: MISC_DYNAMIC_MINOR,
name: TDFX_NAME,
fops: &tdfx_fops,
};
static drm_ioctl_desc_t tdfx_ioctls[] = {
[DRM_IOCTL_NR(DRM_IOCTL_VERSION)] = { tdfx_version, 0, 0 },
[DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE)] = { drm_getunique, 0, 0 },
[DRM_IOCTL_NR(DRM_IOCTL_GET_MAGIC)] = { drm_getmagic, 0, 0 },
[DRM_IOCTL_NR(DRM_IOCTL_IRQ_BUSID)] = { drm_irq_busid, 0, 1 },
[DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)] = { drm_setunique, 1, 1 },
[DRM_IOCTL_NR(DRM_IOCTL_BLOCK)] = { drm_block, 1, 1 },
[DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)] = { drm_unblock, 1, 1 },
[DRM_IOCTL_NR(DRM_IOCTL_AUTH_MAGIC)] = { drm_authmagic, 1, 1 },
[DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)] = { drm_addmap, 1, 1 },
[DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)] = { tdfx_addctx, 1, 1 },
[DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)] = { tdfx_rmctx, 1, 1 },
[DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)] = { tdfx_modctx, 1, 1 },
[DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)] = { tdfx_getctx, 1, 0 },
[DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)] = { tdfx_switchctx, 1, 1 },
[DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)] = { tdfx_newctx, 1, 1 },
[DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)] = { tdfx_resctx, 1, 0 },
[DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)] = { drm_adddraw, 1, 1 },
[DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)] = { drm_rmdraw, 1, 1 },
[DRM_IOCTL_NR(DRM_IOCTL_LOCK)] = { tdfx_lock, 1, 0 },
[DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)] = { tdfx_unlock, 1, 0 },
[DRM_IOCTL_NR(DRM_IOCTL_FINISH)] = { drm_finish, 1, 0 },
#if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
[DRM_IOCTL_NR(DRM_IOCTL_AGP_ACQUIRE)] = {drm_agp_acquire, 1, 1},
[DRM_IOCTL_NR(DRM_IOCTL_AGP_RELEASE)] = {drm_agp_release, 1, 1},
[DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE)] = {drm_agp_enable, 1, 1},
[DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO)] = {drm_agp_info, 1, 1},
[DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC)] = {drm_agp_alloc, 1, 1},
[DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE)] = {drm_agp_free, 1, 1},
[DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND)] = {drm_agp_unbind, 1, 1},
[DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND)] = {drm_agp_bind, 1, 1},
#endif
};
#define TDFX_IOCTL_COUNT DRM_ARRAY_SIZE(tdfx_ioctls)
#ifdef MODULE
static char *tdfx = NULL;
#endif
MODULE_AUTHOR("VA Linux Systems, Inc.");
MODULE_DESCRIPTION("tdfx");
MODULE_PARM(tdfx, "s");
#ifndef MODULE
/* tdfx_options is called by the kernel to parse command-line options
* passed via the boot-loader (e.g., LILO). It calls the insmod option
* routine, drm_parse_drm.
*/
static int __init tdfx_options(char *str)
{
drm_parse_options(str);
return 1;
}
__setup("tdfx=", tdfx_options);
#endif
static int tdfx_setup(drm_device_t *dev)
{
int i;
atomic_set(&dev->ioctl_count, 0);
atomic_set(&dev->vma_count, 0);
dev->buf_use = 0;
atomic_set(&dev->buf_alloc, 0);
atomic_set(&dev->total_open, 0);
atomic_set(&dev->total_close, 0);
atomic_set(&dev->total_ioctl, 0);
atomic_set(&dev->total_irq, 0);
atomic_set(&dev->total_ctx, 0);
atomic_set(&dev->total_locks, 0);
atomic_set(&dev->total_unlocks, 0);
atomic_set(&dev->total_contends, 0);
atomic_set(&dev->total_sleeps, 0);
for (i = 0; i < DRM_HASH_SIZE; i++) {
dev->magiclist[i].head = NULL;
dev->magiclist[i].tail = NULL;
}
dev->maplist = NULL;
dev->map_count = 0;
dev->vmalist = NULL;
dev->lock.hw_lock = NULL;
init_waitqueue_head(&dev->lock.lock_queue);
dev->queue_count = 0;
dev->queue_reserved = 0;
dev->queue_slots = 0;
dev->queuelist = NULL;
dev->irq = 0;
dev->context_flag = 0;
dev->interrupt_flag = 0;
dev->dma = 0;
dev->dma_flag = 0;
dev->last_context = 0;
dev->last_switch = 0;
dev->last_checked = 0;
init_timer(&dev->timer);
init_waitqueue_head(&dev->context_wait);
dev->ctx_start = 0;
dev->lck_start = 0;
dev->buf_rp = dev->buf;
dev->buf_wp = dev->buf;
dev->buf_end = dev->buf + DRM_BSZ;
dev->buf_async = NULL;
init_waitqueue_head(&dev->buf_readers);
init_waitqueue_head(&dev->buf_writers);
tdfx_res_ctx.handle=-1;
DRM_DEBUG("\n");
/* The kernel's context could be created here, but is now created
in drm_dma_enqueue. This is more resource-efficient for
hardware that does not do DMA, but may mean that
drm_select_queue fails between the time the interrupt is
initialized and the time the queues are initialized. */
return 0;
}
static int tdfx_takedown(drm_device_t *dev)
{
int i;
drm_magic_entry_t *pt, *next;
drm_map_t *map;
drm_vma_entry_t *vma, *vma_next;
DRM_DEBUG("\n");
down(&dev->struct_sem);
del_timer(&dev->timer);
if (dev->devname) {
drm_free(dev->devname, strlen(dev->devname)+1, DRM_MEM_DRIVER);
dev->devname = NULL;
}
if (dev->unique) {
drm_free(dev->unique, strlen(dev->unique)+1, DRM_MEM_DRIVER);
dev->unique = NULL;
dev->unique_len = 0;
}
/* Clear pid list */
for (i = 0; i < DRM_HASH_SIZE; i++) {
for (pt = dev->magiclist[i].head; pt; pt = next) {
next = pt->next;
drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
}
dev->magiclist[i].head = dev->magiclist[i].tail = NULL;
}
#if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
/* Clear AGP information */
if (dev->agp) {
drm_agp_mem_t *temp;
drm_agp_mem_t *temp_next;
temp = dev->agp->memory;
while(temp != NULL) {
temp_next = temp->next;
drm_free_agp(temp->memory, temp->pages);
drm_free(temp, sizeof(*temp), DRM_MEM_AGPLISTS);
temp = temp_next;
}
if (dev->agp->acquired) (*drm_agp.release)();
}
#endif
/* Clear vma list (only built for debugging) */
if (dev->vmalist) {
for (vma = dev->vmalist; vma; vma = vma_next) {
vma_next = vma->next;
drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
}
dev->vmalist = NULL;
}
/* Clear map area and mtrr information */
if (dev->maplist) {
for (i = 0; i < dev->map_count; i++) {
map = dev->maplist[i];
switch (map->type) {
case _DRM_REGISTERS:
case _DRM_FRAME_BUFFER:
#ifdef CONFIG_MTRR
if (map->mtrr >= 0) {
int retcode;
retcode = mtrr_del(map->mtrr,
map->offset,
map->size);
DRM_DEBUG("mtrr_del = %d\n", retcode);
}
#endif
drm_ioremapfree(map->handle, map->size);
break;
case _DRM_SHM:
drm_free_pages((unsigned long)map->handle,
drm_order(map->size)
- PAGE_SHIFT,
DRM_MEM_SAREA);
break;
case _DRM_AGP:
/* Do nothing here, because this is all
handled in the AGP/GART driver. */
break;
}
drm_free(map, sizeof(*map), DRM_MEM_MAPS);
}
drm_free(dev->maplist,
dev->map_count * sizeof(*dev->maplist),
DRM_MEM_MAPS);
dev->maplist = NULL;
dev->map_count = 0;
}
if (dev->lock.hw_lock) {
dev->lock.hw_lock = NULL; /* SHM removed */
dev->lock.pid = 0;
wake_up_interruptible(&dev->lock.lock_queue);
}
up(&dev->struct_sem);
return 0;
}
/* tdfx_init is called via init_module at module load time, or via
* linux/init/main.c (this is not currently supported). */
static int tdfx_init(void)
{
int retcode;
drm_device_t *dev = &tdfx_device;
DRM_DEBUG("\n");
memset((void *)dev, 0, sizeof(*dev));
dev->count_lock = SPIN_LOCK_UNLOCKED;
sema_init(&dev->struct_sem, 1);
#ifdef MODULE
drm_parse_options(tdfx);
#endif
if ((retcode = misc_register(&tdfx_misc))) {
DRM_ERROR("Cannot register \"%s\"\n", TDFX_NAME);
return retcode;
}
dev->device = MKDEV(MISC_MAJOR, tdfx_misc.minor);
dev->name = TDFX_NAME;
drm_mem_init();
drm_proc_init(dev);
#if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
dev->agp = drm_agp_init();
#endif
if((retcode = drm_ctxbitmap_init(dev))) {
DRM_ERROR("Cannot allocate memory for context bitmap.\n");
drm_proc_cleanup();
misc_deregister(&tdfx_misc);
tdfx_takedown(dev);
return retcode;
}
DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
TDFX_NAME,
TDFX_MAJOR,
TDFX_MINOR,
TDFX_PATCHLEVEL,
TDFX_DATE,
tdfx_misc.minor);
return 0;
}
/* tdfx_cleanup is called via cleanup_module at module unload time. */
static void tdfx_cleanup(void)
{
drm_device_t *dev = &tdfx_device;
DRM_DEBUG("\n");
drm_proc_cleanup();
if (misc_deregister(&tdfx_misc)) {
DRM_ERROR("Cannot unload module\n");
} else {
DRM_INFO("Module unloaded\n");
}
drm_ctxbitmap_cleanup(dev);
tdfx_takedown(dev);
#if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
if (dev->agp) {
drm_agp_uninit();
drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
dev->agp = NULL;
}
#endif
}
module_init(tdfx_init);
module_exit(tdfx_cleanup);
int tdfx_version(struct inode *inode, struct file *filp, unsigned int cmd,
unsigned long arg)
{
drm_version_t version;
int len;
copy_from_user_ret(&version,
(drm_version_t *)arg,
sizeof(version),
-EFAULT);
#define DRM_COPY(name,value) \
len = strlen(value); \
if (len > name##_len) len = name##_len; \
name##_len = strlen(value); \
if (len && name) { \
copy_to_user_ret(name, value, len, -EFAULT); \
}
version.version_major = TDFX_MAJOR;
version.version_minor = TDFX_MINOR;
version.version_patchlevel = TDFX_PATCHLEVEL;
DRM_COPY(version.name, TDFX_NAME);
DRM_COPY(version.date, TDFX_DATE);
DRM_COPY(version.desc, TDFX_DESC);
copy_to_user_ret((drm_version_t *)arg,
&version,
sizeof(version),
-EFAULT);
return 0;
}
int tdfx_open(struct inode *inode, struct file *filp)
{
drm_device_t *dev = &tdfx_device;
int retcode = 0;
DRM_DEBUG("open_count = %d\n", dev->open_count);
if (!(retcode = drm_open_helper(inode, filp, dev))) {
#if LINUX_VERSION_CODE < 0x020333
MOD_INC_USE_COUNT; /* Needed before Linux 2.3.51 */
#endif
atomic_inc(&dev->total_open);
spin_lock(&dev->count_lock);
if (!dev->open_count++) {
spin_unlock(&dev->count_lock);
return tdfx_setup(dev);
}
spin_unlock(&dev->count_lock);
}
return retcode;
}
int tdfx_release(struct inode *inode, struct file *filp)
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev;
int retcode = 0;
lock_kernel();
dev = priv->dev;
DRM_DEBUG("open_count = %d\n", dev->open_count);
if (!(retcode = drm_release(inode, filp))) {
#if LINUX_VERSION_CODE < 0x020333
MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */
#endif
atomic_inc(&dev->total_close);
spin_lock(&dev->count_lock);
if (!--dev->open_count) {
if (atomic_read(&dev->ioctl_count) || dev->blocked) {
DRM_ERROR("Device busy: %d %d\n",
atomic_read(&dev->ioctl_count),
dev->blocked);
spin_unlock(&dev->count_lock);
unlock_kernel();
return -EBUSY;
}
spin_unlock(&dev->count_lock);
unlock_kernel();
return tdfx_takedown(dev);
}
spin_unlock(&dev->count_lock);
}
unlock_kernel();
return retcode;
}
/* tdfx_ioctl is called whenever a process performs an ioctl on /dev/drm. */
int tdfx_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
unsigned long arg)
{
int nr = DRM_IOCTL_NR(cmd);
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
int retcode = 0;
drm_ioctl_desc_t *ioctl;
drm_ioctl_t *func;
atomic_inc(&dev->ioctl_count);
atomic_inc(&dev->total_ioctl);
++priv->ioctl_count;
DRM_DEBUG("pid = %d, cmd = 0x%02x, nr = 0x%02x, dev 0x%x, auth = %d\n",
current->pid, cmd, nr, dev->device, priv->authenticated);
if (nr >= TDFX_IOCTL_COUNT) {
retcode = -EINVAL;
} else {
ioctl = &tdfx_ioctls[nr];
func = ioctl->func;
if (!func) {
DRM_DEBUG("no function\n");
retcode = -EINVAL;
} else if ((ioctl->root_only && !capable(CAP_SYS_ADMIN))
|| (ioctl->auth_needed && !priv->authenticated)) {
retcode = -EACCES;
} else {
retcode = (func)(inode, filp, cmd, arg);
}
}
atomic_dec(&dev->ioctl_count);
return retcode;
}
int tdfx_lock(struct inode *inode, struct file *filp, unsigned int cmd,
unsigned long arg)
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
DECLARE_WAITQUEUE(entry, current);
int ret = 0;
drm_lock_t lock;
#if DRM_DMA_HISTOGRAM
cycles_t start;
dev->lck_start = start = get_cycles();
#endif
copy_from_user_ret(&lock, (drm_lock_t *)arg, sizeof(lock), -EFAULT);
if (lock.context == DRM_KERNEL_CONTEXT) {
DRM_ERROR("Process %d using kernel context %d\n",
current->pid, lock.context);
return -EINVAL;
}
DRM_DEBUG("%d (pid %d) requests lock (0x%08x), flags = 0x%08x\n",
lock.context, current->pid, dev->lock.hw_lock->lock,
lock.flags);
#if 0
/* dev->queue_count == 0 right now for
tdfx. FIXME? */
if (lock.context < 0 || lock.context >= dev->queue_count)
return -EINVAL;
#endif
if (!ret) {
#if 0
if (_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)
!= lock.context) {
long j = jiffies - dev->lock.lock_time;
if (lock.context == tdfx_res_ctx.handle &&
j >= 0 && j < DRM_LOCK_SLICE) {
/* Can't take lock if we just had it and
there is contention. */
DRM_DEBUG("%d (pid %d) delayed j=%d dev=%d jiffies=%d\n",
lock.context, current->pid, j,
dev->lock.lock_time, jiffies);
current->state = TASK_INTERRUPTIBLE;
current->policy |= SCHED_YIELD;
schedule_timeout(DRM_LOCK_SLICE-j);
DRM_DEBUG("jiffies=%d\n", jiffies);
}
}
#endif
add_wait_queue(&dev->lock.lock_queue, &entry);
for (;;) {
if (!dev->lock.hw_lock) {
/* Device has been unregistered */
ret = -EINTR;
break;
}
if (drm_lock_take(&dev->lock.hw_lock->lock,
lock.context)) {
dev->lock.pid = current->pid;
dev->lock.lock_time = jiffies;
atomic_inc(&dev->total_locks);
break; /* Got lock */
}
/* Contention */
atomic_inc(&dev->total_sleeps);
current->state = TASK_INTERRUPTIBLE;
#if 1
current->policy |= SCHED_YIELD;
#endif
schedule();
if (signal_pending(current)) {
ret = -ERESTARTSYS;
break;
}
}
current->state = TASK_RUNNING;
remove_wait_queue(&dev->lock.lock_queue, &entry);
}
#if 0
if (!ret && dev->last_context != lock.context &&
lock.context != tdfx_res_ctx.handle &&
dev->last_context != tdfx_res_ctx.handle) {
add_wait_queue(&dev->context_wait, &entry);
current->state = TASK_INTERRUPTIBLE;
/* PRE: dev->last_context != lock.context */
tdfx_context_switch(dev, dev->last_context, lock.context);
/* POST: we will wait for the context
switch and will dispatch on a later call
when dev->last_context == lock.context
NOTE WE HOLD THE LOCK THROUGHOUT THIS
TIME! */
current->policy |= SCHED_YIELD;
schedule();
current->state = TASK_RUNNING;
remove_wait_queue(&dev->context_wait, &entry);
if (signal_pending(current)) {
ret = -EINTR;
} else if (dev->last_context != lock.context) {
DRM_ERROR("Context mismatch: %d %d\n",
dev->last_context, lock.context);
}
}
#endif
if (!ret) {
#if LINUX_VERSION_CODE >= 0x020400 /* KERNEL_VERSION(2,4,0) */
sigemptyset(&dev->sigmask);
sigaddset(&dev->sigmask, SIGSTOP);
sigaddset(&dev->sigmask, SIGTSTP);
sigaddset(&dev->sigmask, SIGTTIN);
sigaddset(&dev->sigmask, SIGTTOU);
dev->sigdata.context = lock.context;
dev->sigdata.lock = dev->lock.hw_lock;
block_all_signals(drm_notifier, &dev->sigdata, &dev->sigmask);
#endif
if (lock.flags & _DRM_LOCK_READY) {
/* Wait for space in DMA/FIFO */
}
if (lock.flags & _DRM_LOCK_QUIESCENT) {
/* Make hardware quiescent */
#if 0
tdfx_quiescent(dev);
#endif
}
}
#if LINUX_VERSION_CODE < 0x020400
if (lock.context != tdfx_res_ctx.handle) {
current->counter = 5;
current->priority = DEF_PRIORITY/4;
}
#endif
DRM_DEBUG("%d %s\n", lock.context, ret ? "interrupted" : "has lock");
#if DRM_DMA_HISTOGRAM
atomic_inc(&dev->histo.lacq[drm_histogram_slot(get_cycles() - start)]);
#endif
return ret;
}
int tdfx_unlock(struct inode *inode, struct file *filp, unsigned int cmd,
unsigned long arg)
{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->dev;
drm_lock_t lock;
copy_from_user_ret(&lock, (drm_lock_t *)arg, sizeof(lock), -EFAULT);
if (lock.context == DRM_KERNEL_CONTEXT) {
DRM_ERROR("Process %d using kernel context %d\n",
current->pid, lock.context);
return -EINVAL;
}
DRM_DEBUG("%d frees lock (%d holds)\n",
lock.context,
_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
atomic_inc(&dev->total_unlocks);
if (_DRM_LOCK_IS_CONT(dev->lock.hw_lock->lock))
atomic_inc(&dev->total_contends);
drm_lock_transfer(dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT);
/* FIXME: Try to send data to card here */
if (!dev->context_flag) {
if (drm_lock_free(dev, &dev->lock.hw_lock->lock,
DRM_KERNEL_CONTEXT)) {
DRM_ERROR("\n");
}
}
#if LINUX_VERSION_CODE < 0x020400
if (lock.context != tdfx_res_ctx.handle) {
current->counter = 5;
current->priority = DEF_PRIORITY;
}
#endif
#if LINUX_VERSION_CODE >= 0x020400 /* KERNEL_VERSION(2,4,0) */
unblock_all_signals();
#endif
return 0;
}
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