source: trunk/kernel/syscalls/syscalls.h @ 436

Last change on this file since 436 was 436, checked in by alain, 4 years ago

1) improve the threads and process destruction mechanism.
2) introduce FIFOs in the soclib_tty driver.

File size: 36.1 KB
Line 
1/*
2 * syscalls.h - Kernel side services for syscall handling.
3 *
4 * Author     Alain Greiner (2016,2017)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#ifndef _SYSCALLS_H_
25#define _SYSCALLS_H_
26
27#include <hal_types.h>
28#include <shared_syscalls.h>
29
30/**   Forward declarations  *****/
31
32struct thread_s;                  // defined in thread.h
33struct pthread_attr_s;            // defined in thread.h
34struct vfs_stat_s;                // defined in vfs.h
35struct vfs_dirent_s;              // defined in vfs.h
36struct mmap_attr_s;               // defined in vmm.h
37
38/******************************************************************************************
39 * [0] This function terminates the execution of the calling user thread,
40 * and makes the exit_value pointer available to any successful pthread_join() with the
41 * terminating thread.
42 * It actually set the THREAD_SIG_EXIT signal, set the THREAD_BLOCKED_GLOBAL bit in the
43 * thread descriptor and deschedule.
44 * The thread will be detached from its process, and the memory allocated to the thread
45 * descriptor will be released later by the scheduler.
46 ******************************************************************************************
47 * @ exit_vallue  : pointer to be returned to joining thread if thread is attached.
48 * @ return 0 if success / return -1 if all locks not released or illegal argument.
49 *****************************************************************************************/
50int sys_thread_exit( void * exit_value );
51
52/******************************************************************************************
53 * [1] This function calls the scheduler for the core running the calling thread.
54 ******************************************************************************************
55 * @ x_size   : [out] number of clusters in a row.
56 * @ y_size   : [out] number of clusters in a column.
57 * @ ncores   : [out] number of cores per cluster.
58 * @ return always 0.
59 *****************************************************************************************/
60int sys_thread_yield();
61
62/******************************************************************************************
63 * [2] This function creates a new user thread. The <user_attr> argument is a pointer
64 * on astructure containing the thread attributes, defined in thread.h file.
65 ******************************************************************************************
66 * @ new_thread  : [out] local pointer on created thread descriptor.
67 * @ user_attr   : [in]  pointer on thread attributes structure.
68 * @ start_func  : [in]  pointer on start function.
69 * @ start_args  : [in]  pointer on start function arguments.
70 * @ return 0 if success / return -1 if failure.
71 *****************************************************************************************/
72int sys_thread_create( struct thread_s        * new_thread,
73                       struct pthread_attr_s  * user_attr,
74                       void                   * start_func,
75                       void                   * start_args );
76
77/******************************************************************************************
78 * [3] This blocking function suspend execution of the calling thread until completion
79 * of another target thread identified by the <trdid> argument.
80 * The target thread must be joinable (running in ATTACHED mode), and must be different
81 * from the calling thread.
82 * If the <exit_value> argument is not NULL, the value passed to pthread_exit() by the
83 * target thread is stored in the location referenced by exit_value.
84 ******************************************************************************************
85 * @ trdid     : [in]  target thread identifier.
86 * @ thread    : [out] buffer for exit_value returned by target thread.
87 * @ return 0 if success / return -1 if failure.
88 *****************************************************************************************/
89int sys_thread_join( trdid_t    trdid,
90                     void    ** exit_value );
91
92/******************************************************************************************
93 * [4] This function detach a joinable thread.
94 ******************************************************************************************
95 * @ trdid   : thread identifier.
96 * @ return 0 if success / return -1 if failure.
97 *****************************************************************************************/
98int sys_thread_detach( trdid_t  trdid );
99
100/******************************************************************************************
101 * [5] This function requests a target thread identified by its <trdid> argument
102 * to be cancelled. It calls the thread_kill() function to block the target thread
103 * on the THREAD_BLOCKED_GLOBAL condition, and to set the THREAD_FLAG_REQ_DELETE.
104 * The thread will be detached from its process, and the memory allocated to the thread
105 * descriptor will be released by the scheduler at the next scheduling point.
106 ******************************************************************************************
107 * @ trdid   : thread identifier.
108 * @ return 0 if success / return -1 if illegal argument.
109 *****************************************************************************************/
110int sys_thread_cancel( trdid_t  trdid );
111
112/******************************************************************************************
113 * [6] This function implement all operations on a POSIX unnamed semaphore,
114 * that can be shared by threads running in different clusters.
115 * The kernel structure representing a remote semaphore is in the remote_sem.h file,
116 * and the code implementing the operations is in the remore_sem.c file.
117 ******************************************************************************************
118 * @ vaddr     : semaphore virtual address in user space == identifier.
119 * @ operation : SEM_INIT / SEM_DESTROY / SEM_GETVALUE / SEM_POST / SEM_WAIT.
120 * @ value     : pointer on in/out argument in user space.
121 * @ return 0 if success / return -1 if failure.
122 *****************************************************************************************/
123int sys_sem( void       * vaddr,
124             uint32_t     operation,
125             uint32_t   * value );
126
127/******************************************************************************************
128 * [7] This function implement all operations on a POSIX condition variable.
129 * The kernel structure representing a cond_var is defined in the remote_cv.h file,
130 * The code implementing the operations is defined in the remote_cv.c file.
131 ******************************************************************************************
132 * @ vaddr     : condvar virtual address in user space == identifier.
133 * @ operation : operation type (see below).
134 * @ attr      : mutex virtual address in user space == identifier.
135 * @ return 0 if success / return -1 if failure.
136 *****************************************************************************************/
137int sys_condvar( void     * condvar,
138                 uint32_t   operation,
139                 void     * mutex );
140
141/******************************************************************************************
142 * [8] This function implement all operations on a POSIX barrier.
143 * The kernel structure representing a barrier is defined in the remote_barrier.h file.
144 * The code implementting the operations is defined in the remote_barrier.c file.
145 ******************************************************************************************
146 * @ vaddr     : barrier virtual address in user space == identifier.
147 * @ operation : BARRIER_INIT / BARRIER_DESTROY / BARRIER_WAIT.
148 * @ count     : number of expected threads (only used by BARRIER_INIT operation).
149 * @ return 0 if success / return -1 if failure.
150 *****************************************************************************************/
151int sys_barrier( void     * vaddr,
152                 uint32_t   operation,
153                 uint32_t   count );
154
155/******************************************************************************************
156 * [9] This function implement all operations on a POSIX mutex.
157 * The kernel structure representing a barrier is defined in the remote_barrier.h file.
158 * The code implementting the operations is defined in the remote_barrier.c file.
159 ******************************************************************************************
160 * @ vaddr     : mutex virtual address in user space == identifier.
161 * @ operation : MUTEX_INIT / MUTEX_DESTROY / MUTEX_LOCK / MUTEX_UNLOCK
162 * @ attr      : mutex attributes (non supported yet => must be 0).
163 * @ return 0 if success / return -1 if failure.
164 *****************************************************************************************/
165int sys_mutex( void     * vaddr,
166               uint32_t   operation,
167               uint32_t   count );
168
169/******************************************************************************************
170 * [10] This function implement the exit system call terminating a POSIX process.
171 * In the present implementation, this function implements actually the _exit():
172 * - it does not flush open ourput steams.
173 * - it does not close open streams.
174 ******************************************************************************************
175 * @ status   : terminaison status (not used in present implementation).
176 *****************************************************************************************/
177int sys_exit( uint32_t status );
178
179/******************************************************************************************
180 * [11] This function remove an existing mapping defined by the <addr> and <size>
181 * arguments in user space.
182 ******************************************************************************************
183 * @ addr  : base address in user space.
184 * # size  : number of bytes.
185 * @ return 0 if success / return -1 if failure.
186 *****************************************************************************************/
187int sys_munmap( void     * addr,
188                uint32_t   size );
189
190/******************************************************************************************
191 * [12] This function open or create an open file descriptor.
192 ******************************************************************************************
193 * @ pathname   : pathname (can be relative or absolute).
194 * @ flags      : bit vector attributes (see below).
195 * @ mode       : access rights.
196 * @ return file descriptor index in fd_array if success / return -1 if failure.
197 *****************************************************************************************/
198int sys_open( char    * pathname,
199              uint32_t  flags,
200              uint32_t  mode );
201
202/******************************************************************************************
203 * [13] This function map physical memory (or a file) in the calling thread virtual space.
204 * The <attr> argument is a pointer on a structure for arguments (see shared_syscalls.h).
205 ******************************************************************************************
206 * @ attr       : pointer on attributes structure.
207 * @ return 0 if success / return -1 if failure.
208 *****************************************************************************************/
209int sys_mmap( mmap_attr_t * attr );
210
211/******************************************************************************************
212 * [14] This function read bytes from an open file identified by its file descriptor.
213 * The file can be a regular file or character oriented device.
214 * IRQs are enabled during this system call.
215 ******************************************************************************************
216 * @ file_id  : open file index in fd_array.
217 * @ buf      : buffer virtual address in user space.
218 * @ count    : number of bytes.
219 * @ return number of bytes actually read if success / returns -1 if failure.
220 *****************************************************************************************/
221int sys_read( uint32_t   file_id,
222              void     * buf,
223              uint32_t   count );
224
225/******************************************************************************************
226 * [15] This function writes bytes to an open file identified by its file descriptor.
227 * The file can be a regular file or character oriented device.
228 * IRQs are enabled during this system call.
229 ******************************************************************************************
230 * @ file_id  : open file index in fd_array.
231 * @ buf      : buffer virtual address in user space.
232 * @ count    : number of bytes.
233 * @ return number of bytes actually written if success / returns -1 if failure.
234 *****************************************************************************************/
235int sys_write( uint32_t   file_id,
236               void     * buf,
237               uint32_t   count );
238
239/******************************************************************************************
240 * [16] This function repositions the offset of the file descriptor identified by <file_id>,
241 * according to the operation type defined by the <whence> argument.
242 ******************************************************************************************
243 * @ file_id  : open file index in fd_array.
244 * @ offset   : used to compute new offset value.
245 * @ whence   : operation type (see below).
246 * @ return 0 if success / returns -1 if failure.
247 *****************************************************************************************/
248int sys_lseek( xptr_t    file_id,
249               uint32_t  offset,
250               uint32_t  whence );
251
252/******************************************************************************************
253 * [17] This function release the memory allocated for the file descriptor identified by
254 * the <file_id> argument, and remove the fd array_entry in all copies of the process
255 * descriptor.
256 ******************************************************************************************
257  file_id   : file descriptor index in fd_array.
258 * @ return 0 if success / returns -1 if failure.
259 *****************************************************************************************/
260int sys_close( uint32_t file_id );
261
262/******************************************************************************************
263 * [18] This function removes a directory entry identified by the <pathname> from the
264 * directory, and decrement the link count of the file referenced by the link.
265 * If the link count reduces to zero, and no process has the file open, then all resources
266 * associated with the file are reclaimed.  If one or more process have the file open when
267 * the last link is removed, the link is removed, but the removal of the file is delayed
268 * until all references to it have been closed.
269 ******************************************************************************************
270 * @ pathname   : pathname (can be relative or absolute).
271 * @ return 0 if success / returns -1 if failure.
272 *****************************************************************************************/
273int sys_unlink( char * pathname );
274
275/******************************************************************************************
276 * [19] This function creates in the calling thread cluster an unnamed pipe, and two
277 * (read and write) file descriptors.
278 * TODO not implemented yet...
279 ******************************************************************************************
280 * @ file_id[0] : [out] read only file descriptor index.
281 * @ file_id[1] : [out] write only file descriptor index.
282 * @ return 0 if success / return -1 if failure.
283 *****************************************************************************************/
284int sys_pipe( uint32_t file_id[2] );
285
286/******************************************************************************************
287 * [20] This function change the current working directory in reference process descriptor.
288 ******************************************************************************************
289 * @ pathname   : pathname (can be relative or absolute).
290 * @ return 0 if success / returns -1 if failure.
291 *****************************************************************************************/
292int sys_chdir( char * pathname );
293
294/******************************************************************************************
295 * [21] This function creates a new directory in file system.
296 ******************************************************************************************
297 * @ pathname   : pathname (can be relative or absolute).
298 * @ mode       : access rights (as defined in chmod).
299 * @ return 0 if success / returns -1 if failure.
300 *****************************************************************************************/
301int sys_mkdir( char    * pathname,
302               uint32_t  mode );
303
304/******************************************************************************************
305 * [22] This function creates a named FIFO file in the calling thread cluster.
306 * The associated read and write file descriptors mut be be  explicitely created
307 * using the sys_open() function.
308 ******************************************************************************************
309 * @ pathname   : pathname (can be relative or absolute).
310 * @ mode       : access rights (as defined in chmod).
311 * @ return 0 if success / returns -1 if failure.
312 *****************************************************************************************/
313int sys_mkfifo( char     * pathname,
314                uint32_t   mode );
315
316/******************************************************************************************
317 * [23] This function open a directory, that must exist in the file system, returning
318 * a DIR pointer on the directory in user space.
319 ******************************************************************************************
320 * @ pathname   : pathname (can be relative or absolute).
321 * @ dirp       : [out] buffer for pointer on user directory (DIR).
322 * @ return 0 if success / returns -1 if failure.
323 *****************************************************************************************/
324int sys_opendir( char * pathname,
325                 DIR ** dirp );
326
327/******************************************************************************************
328 * [24] This function returns an user pointer on the dirent structure describing the
329 * next directory entry in the directory identified by the <dirp> argument.
330 ******************************************************************************************
331 * @ dirp     : user pointer identifying the searched directory.
332 * @ dentp    : [out] buffer for pointer on user direntory entry (dirent).
333 * @ return O if success / returns -1 if failure.
334 *****************************************************************************************/
335int sys_readdir( DIR            * dirp,
336                 struct dirent ** dentp );
337
338/******************************************************************************************
339 * [25] This function closes the directory identified by the <dirp> argument, and releases
340 * all structures associated with the <dirp> pointer.
341 ******************************************************************************************
342 * @ dirp     : user pointer identifying the directory.
343 * @ return 0 if success / returns -1 if failure.
344 *****************************************************************************************/
345int sys_closedir( DIR * dirp );
346
347/******************************************************************************************
348 * [26] This function returns the pathname of the current working directory.
349 ******************************************************************************************
350 * buf     : buffer addres in user space.
351 * nbytes  : user buffer size in bytes.
352 * @ return 0 if success / returns -1 if failure.
353 *****************************************************************************************/
354int sys_getcwd( char     * buf,
355                uint32_t   nbytes );
356
357/******************************************************************************************
358 * [27] This slot is not used.
359 *****************************************************************************************/
360
361/******************************************************************************************
362 * [28] This function forces the calling thread to sleep, for a fixed number of cycles.
363 ******************************************************************************************
364 * cycles   : number of cycles.
365 *****************************************************************************************/
366int sys_alarm( uint32_t cycles );
367
368/******************************************************************************************
369 * [29] This function removes a directory file whose name is given by <pathname>.
370 * The directory must not have any entries other than `.' and `..'.
371 ******************************************************************************************
372 * @ pathname   : pathname (can be relative or absolute).
373 * @ return 0 if success / returns -1 if failure.
374 *****************************************************************************************/
375int sys_rmdir( char * pathname ); 
376
377/******************************************************************************************
378 * [30] This function implement the operations related to User Thread Local Storage.
379 * It is actually implemented as an uint32_t variable in the thread descriptor.
380 ******************************************************************************************
381 * @ operation  : UTLS operation type as defined below.
382 * @ value      : argument value for the UTLS_SET operation.
383 * @ return value for the UTLS_GET and UTLS_GET_ERRNO / return -1 if failure.
384 *****************************************************************************************/
385int sys_utls( uint32_t operation,
386              uint32_t value );
387
388/******************************************************************************************
389 * [31] This function change the acces rights for the file/dir identified by the
390 * pathname argument.
391 ******************************************************************************************
392 * @ pathname   : pathname (can be relative or absolute).
393 * @ rights     : acces rights.
394 * @ return 0 if success / returns -1 if failure.
395 *****************************************************************************************/
396int sys_chmod( char     * pathname,
397               uint32_t   rights );
398
399/******************************************************************************************
400 * [32] This function associate a specific signal handler to a given signal type.
401 * Tee handlers for the SIGKILL and SIGSTOP signals cannot be redefined.
402 ******************************************************************************************
403 * @ sig_id    : index defining signal type (from 1 to 31).
404 * @ handler   : pointer on fonction implementing the specific handler.
405 * @ return 0 if success / returns -1 if failure.
406 *****************************************************************************************/
407int sys_signal( uint32_t   sig_id,
408                void     * handler );
409
410/******************************************************************************************
411 * [33] This function returns in the structure <tv>, defined in the time.h file,
412 * the current time (in seconds & micro-seconds).
413 * It is computed from the calling core descriptor.
414 * The timezone is not supported.
415 ******************************************************************************************
416 * @ tv      : pointer on the timeval structure.
417 * @ tz      : pointer on the timezone structure : must be NULL.       
418 * @ return 0 if success / returns -1 if failure.
419 *****************************************************************************************/
420int sys_timeofday( struct timeval  * tv,
421                   struct timezone * tz );
422
423/******************************************************************************************
424 * [34] This function implements the "kill" system call on the kernel side.
425 * It register the signal defined by the <sig_id> argument in all thread descriptors
426 * of a target process identified by the <pid> argument. This is done in all clusters
427 * containing threads for the target process.
428 * It can be executed by any thread running in any cluster, as this function uses
429 * remote access to traverse the list of process copies stored in the owner cluster,
430 * and the RPC_SIGNAL_RISE to signal the remote threads.
431 * This function does nothing for (sig_id == 0). This can be used to check process pid.
432 * TODO : This first implementation supports only SIGKILL / SIGSTOP / SIGCONT values.
433 ******************************************************************************************
434 * @ pid      : target process identifier.
435 * @ sig_id   : index defining the signal type.
436 * @ return 0 if success / returns -1 if failure.
437 *****************************************************************************************/
438int sys_kill( pid_t    pid,
439              uint32_t sig_id );
440
441/******************************************************************************************
442 * [35] This function implements the "getpid" system call on the kernel side.
443 ******************************************************************************************
444 * @ returns the process PID for the calling thread.
445 *****************************************************************************************/
446int sys_getpid();
447
448/******************************************************************************************
449 * [36] This function implement the "fork" system call on the kernel side.
450 * The calling process descriptor (parent process), and the associated thread descriptor
451 * are replicated in a - likely - remote cluster, that becomes the child process owner.
452 * The child process get a new PID, and is linked to the parent PID. The child process
453 * inherit from its parent the memory image, and all open files (including the TXT).
454 * The child process becomes the TXT terminal owner.
455 * The target cluster depends on the "fork_user" flag and "fork_cxy" variable that can be
456 * stored in the calling thread descriptor by the specific fork_place() system call.
457 * If not, the kernel function makes a query to the DQDT to select the target cluster.
458 ******************************************************************************************
459 * @ if success, returns child process PID to parent, and return O to child.
460 * @ if failure, returns -1 to parent / no child process is created.
461 *****************************************************************************************/
462int sys_fork();
463
464/******************************************************************************************
465 * [37] This function implement the "exec" system call on the kernel side.
466 * It creates, in the same cluster as the calling thread, a new process descriptor,
467 * and a new associated main thread descriptor, executing a new memory image defined
468 * by the <filename> argument. This new process inherit from the old process the PID
469 * and the PPID, as well as all open files (including the TXT).
470 * The old process descriptor, and all its threads are blocked, and marked for deletion.
471 * Therefore the exec syscall does not return to the calling thread in case of success.
472 * This function build an exec_info_t structure containing the new process arguments,
473 * as defined by the <arv> argument, and the new process environment variables,
474 * as defined by the <envp>  argument.
475 * TODO : the <argv> and <envp> arguments are not supported yet (both must be NULL).
476 ******************************************************************************************
477 * @ filename : string pointer on .elf filename (pointer in user space)
478 * @ argv     : array of strings on process arguments (pointers in user space)
479 * @ envp     : array of strings on environment variables (pointers in user space)
480 * @ does not return if success / returns -1 if failure.
481 *****************************************************************************************/
482int sys_exec( char  * filename,
483              char ** argv,
484              char ** envp );
485
486/******************************************************************************************
487 * [38] This function  returns in the <stat> structure, defined in the "shared_syscalls.h"
488 * file, various informations on the file/directory identified by the <pathname> argument.
489 ******************************************************************************************
490 * @ pathname  : user pointer on file pathname.
491 * @ stat      : user pointer on the stat structure.
492 * @ returns O if success / returns -1 if failure.
493 *****************************************************************************************/
494int sys_stat( const char  * pathname,
495              struct stat * stat );
496
497/******************************************************************************************
498 * [39] This blocking function waits a change of a child process state, that can be:
499 * - a termination of child following a process_make_exit().
500 * - a termination of child following a process_make_kill().
501 * - a blocking of child following a SIGSTOP signal.
502 * In case of a multi-thread process, this function must be called by the main thread
503 * runningin the reference cluster.
504 * When a change has been observed, it returns the PID of the child process, and stores
505 * in the <status> argument relevant information on the child state change.
506 * The following macros can be used to extract information from status:
507 * - WIFEXITED(status)   : is true if the child process terminated with an exit().
508 * - WIFSIGNALED(status) : is true if the child process killed by a signal.
509 * - WIFSTOPPED(status)  : is true if the child process is stopped by a signal.
510 * - WEXITSTATUS(status) : returns the low-order 8 bits of the exit() argument.
511 * If a parent process terminates without waiting for all child processes to terminate,
512 * the remaining child processes are attached to the init process.
513 * WARNING: negative values for the <pid> argument are not supported.
514 ******************************************************************************************
515 * @ searched_pid : searched child process identifier.
516 * @ status       : [out] child termination status.
517 * @ return child PID if success / return -1 if searched PID not found.
518 *****************************************************************************************/
519int sys_wait( uint32_t * status );
520
521/******************************************************************************************
522 * [40] This function returns the hardware platform parameters.
523 ******************************************************************************************
524 * @ x_size   : [out] number of clusters in a row.
525 * @ y_size   : [out] number of clusters in a column.
526 * @ y_width  : [out] number of bits in Y field for CXY.
527 * @ ncores   : [out] number of cores per cluster.
528 * @ return 0 if success / return -1 if illegal arguments
529 *****************************************************************************************/
530int sys_get_config( uint32_t * x_size,
531                    uint32_t * y_size,
532                    uint32_t * y_width,
533                    uint32_t * ncores );
534
535/******************************************************************************************
536 * [41] This function returns the calling core cluster and local index.
537 ******************************************************************************************
538 * @ cxy      : [out] cluster identifier (fixed format)
539 * @ lid      : [out] core local index in cluster.
540 * @ return 0 if success / return -1 if illegal arguments
541 *****************************************************************************************/
542int sys_get_core( uint32_t * cxy,
543                  uint32_t * lid );
544
545/******************************************************************************************
546 * [42] This function returns in a 64 bits user buffer the calling core cycles count.
547 * It uses both the hardware register and the core descriptor cycles count to take
548 * into account a possible harware register overflow  in 32 bits architectures.
549 ******************************************************************************************
550 * cycle    : [out] address of buffer in user space.
551 * @ return 0 if success / return -1 if illegal arguments
552 *****************************************************************************************/
553int sys_get_cycle( uint64_t * cycle );
554
555/******************************************************************************************
556 * [43] This debug function displays on the kernel terminal TXT0 an user defined string,
557 * or the current state of a kernel structure, identified by the <type> argument.
558 * The <arg0> and <arg1> arguments depends on the structure type:
559 * - DISPLAY_STRING          : an user defined string
560 * - DISPLAY_VMM             : VSL and GPT for a process identified by <pid>.
561 * - DISPLAY_SCHED           : all threads allocated to a scheduler <cxy> & <lid>.
562 * - DISPLAY_CLUSTER_PROCESS : all processes registered in a cluster identified by <cxy>. 
563 * - DISPLAY_TXT_PROCESS     : all processes registered in a cluster identified by <cxy>. 
564 * - DISPLAY_VFS             : all files registered in the VFS cache.
565 * - DISPLAY_CHDEV           : all registered channel devices.
566 ******************************************************************************************
567 * type      : [in] type of display
568 * arg0      : [in] type dependant argument.
569 * arg1      : [in] type dependant argument.
570 * @ return 0 if success / return -1 if illegal arguments
571 *****************************************************************************************/
572int sys_display( reg_t  type,
573                 reg_t  arg0,
574                 reg_t  arg1 );
575
576/******************************************************************************************
577 * [45] This function block the calling thread on the THREAD_BLOCKED_GLOBAL condition,
578 * and deschedule.
579 ******************************************************************************************
580 * @ return 0 if success / returns -1 if failure.
581 *****************************************************************************************/
582int sys_thread_sleep();
583
584/******************************************************************************************
585 * [46] This function unblock the thread identified by its <trdid> from the
586 * THREAD_BLOCKED_GLOBAL condition.
587 ******************************************************************************************
588 * @ trdid  : target thread identifier.
589 * @ return 0 if success / return -1 if failure.
590 *****************************************************************************************/
591int sys_thread_wakeup();
592
593/******************************************************************************************
594 * [47] This non-standard function is used to activate / desactivate the trace for a thread
595 * identified by the <trdid> and <pid> arguments.
596 * It can be called by any other thread in the same process.
597 ******************************************************************************************
598 * @ operation  : operation type as defined below.
599 * @ pid        : process identifier.
600 * @ trdid      : thread identifier.
601 * @ returns O if success / returns -1 if failure.
602 *****************************************************************************************/
603int sys_trace( uint32_t operation,
604               pid_t    pid, 
605               uint32_t trdid );
606
607/******************************************************************************************
608 * [48] This function gives the process identified by the <pid> argument
609 * the exclusive ownership of its TXT_TX terminal (put it in foreground).
610 ******************************************************************************************
611 * @ pid    : process identifier.
612 * @ return 0 if success / return -1 if failure.
613 *****************************************************************************************/
614int sys_fg( pid_t   pid );
615
616
617#endif  // _SYSCALLS_H_
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