source: trunk/kernel/syscalls/syscalls.h @ 23

Last change on this file since 23 was 23, checked in by alain, 5 years ago

Introduce syscalls.

File size: 32.3 KB
Line 
1/*
2 * syscalls.h - kernel services definition
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 <time.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 * This enum defines the mnemonics for the syscall indexes.
40 * It must be kept consistent with the array defined in do_syscalls.c
41 *****************************************************************************************/
42enum
43{
44        SYS_THREAD_EXIT    = 0,
45        SYS_MMAP           = 1,
46        SYS_THREAD_CREATE  = 2,
47        SYS_THREAD_JOIN    = 3,
48        SYS_THREAD_DETACH  = 4,
49        SYS_THREAD_YIELD   = 5,
50        SYS_SEM            = 6,
51        SYS_CONDVAR        = 7,
52        SYS_BARRIER        = 8,
53        SYS_MUTEX          = 9,
54
55        SYS_SLEEP          = 10,
56        SYS_WAKEUP         = 11,
57        SYS_OPEN           = 12,
58        SYS_CREAT          = 13,
59        SYS_READ           = 14,
60        SYS_WRITE          = 15,
61        SYS_LSEEK          = 16,
62        SYS_CLOSE          = 17,
63        SYS_UNLINK         = 18,   
64        SYS_PIPE           = 19,
65
66        SYS_CHDIR          = 20,
67        SYS_MKDIR          = 21,
68        SYS_MKFIFO         = 22,   
69        SYS_OPENDIR        = 23,
70        SYS_READDIR        = 24,
71        SYS_CLOSEDIR       = 25,
72        SYS_GETCWD         = 26,
73        SYS_CLOCK          = 27,
74        SYS_ALARM          = 28,   
75        SYS_RMDIR          = 29,
76
77        SYS_UTLS           = 30, 
78        SYS_CHMOD          = 31,
79        SYS_SIGNAL         = 32,
80        SYS_TIMEOFDAY      = 33,
81        SYS_KILL           = 34,
82        SYS_GETPID         = 35,
83        SYS_FORK           = 36,
84        SYS_EXEC           = 37,
85        SYS_STAT           = 38,     
86        SYS_TRACE          = 39,
87       
88        SYSCALLS_NR        = 40,
89};
90
91
92/********************************************************************************************/
93/********************    system calls    ****************************************************/ 
94/********************************************************************************************/
95
96/*********************************************************************************************
97 * [0] This function terminates the execution of the calling user thread value,
98 * and makes the exit_value pointer available to any successful pthread_join() with the
99 * terminating thread.
100 *********************************************************************************************
101 * @ exit_vallue  : [out] pointer to to the parrent thread if attached.
102 * @ return 0 if success / return -1 if failure.
103 ********************************************************************************************/
104int sys_thread_exit( void * exit_value );
105
106/*********************************************************************************************
107 * [1] This function map physical memory (or a file) in the calling thread virtual space.
108 * The <attr> argument is a pointer on a structure containing arguments, defined in vmm.h.
109 * TODO not implemented yet...
110 *********************************************************************************************
111 * @ attr       : pointer on attributes structure.
112 * @ return 0 if success / return -1 if failure.
113 ********************************************************************************************/
114int sys_mmap( struct mmap_attr_s * attr );
115
116/*********************************************************************************************
117 * [2] This function creates a new user thread. The <user_attr> argument is a pointer
118 * on astructure containing the thread attributes, defined in thread.h file.
119 *********************************************************************************************
120 * @ new_thread  : [out] local pointer on created thread descriptor.
121 * @ user_attr   : [in]  pointer on thread attributes structure.
122 * @ start_func  : [in]  pointer on start function.
123 * @ start_args  : [in]  pointer on start function arguments.
124 * @ return 0 if success / return -1 if failure.
125 ********************************************************************************************/
126int sys_thread_create( struct thread_s        * new_thread,
127                       struct pthread_attr_s  * user_attr,
128                       void                   * start_func,
129                       void                   * start_args );
130
131/*********************************************************************************************
132 * [3] This blocking function suspend execution of the calling thread until completion
133 * of another target thread identified by the <trdid> argument.
134 * If the <exit_value> argument is not NULL, the value passed to pthread_exit() by the
135 * target thread is stored in the location referenced by exit_value.
136 *********************************************************************************************
137 * @ trdid     : [in]  target thread identifier.
138 * @ thread    : [out] buffer for exit_value returned by target thread.
139 * @ return 0 if success / return -1 if failure.
140 ********************************************************************************************/
141int sys_thread_join( trdid_t    trdid,
142                     void    ** exit_value );
143
144/*********************************************************************************************
145 * [4] This function detach a joinable thread.
146 *********************************************************************************************
147 * @ trdid   : thread identifier.
148 * @ return 0 if success / return -1 if failure.
149 ********************************************************************************************/
150int sys_thread_detach( trdid_t  trdid );
151
152/*********************************************************************************************
153 * [5] This function calls the scheduler for the core running the calling thread.
154 *********************************************************************************************
155 * @ return always 0.
156 ********************************************************************************************/
157int sys_thread_yield();
158
159/*********************************************************************************************
160 * [6] This function implement all operations on a POSIX unnamed semaphore,
161 * that can be shared by threads running in different clusters.
162 * The kernel structure representing a remote semaphore is in the remote_sem.h file,
163 * and the code implementing the operations is in the remore_sem.c file.
164 *********************************************************************************************
165 * @ vaddr     : semaphore virtual address in user space == identifier.
166 * @ operation : SEM_INIT / SEM_DESTROY / SEM_GETVALUE / SEM_POST / SEM_WAIT.
167 * @ value     : pointer on in/out argument in user space.
168 * @ return 0 if success / return -1 if failure.
169 ********************************************************************************************/
170int sys_sem( void       * vaddr,
171             uint32_t     operation,
172             uint32_t   * value );
173
174typedef enum
175{
176        SEM_INIT,
177        SEM_DESTROY,
178        SEM_GETVALUE,
179        SEM_WAIT,
180        SEM_POST,
181} 
182sem_operation_t;
183
184/*********************************************************************************************
185 * [7] This function implement all operations on a POSIX condition variable.
186 * The kernel structure representing a cond_var is defined in the remote_cv.h file,
187 * The code implementing the operations is defined in the remote_cv.c file.
188 *********************************************************************************************
189 * @ vaddr     : condvar virtual address in user space == identifier.
190 * @ operation : operation type (see below).
191 * @ attr      : mutex virtual address in user space == identifier.
192 * @ return 0 if success / return -1 if failure.
193 ********************************************************************************************/
194int sys_condvar( void     * condvar,
195                 uint32_t   operation,
196                 void     * mutex );
197
198typedef enum
199{
200        CONDVAR_INIT,
201        CONDVAR_DESTROY,
202    CONDVAR_WAIT,
203    CONDVAR_SIGNAL,
204    CONDVAR_BROADCAST,
205} 
206condvar_operation_t;
207
208/*********************************************************************************************
209 * [8] This function implement all operations on a POSIX barrier.
210 * The kernel structure representing a barrier is defined in the remote_barrier.h file.
211 * The code implementting the operations is defined in the remote_barrier.c file.
212 *********************************************************************************************
213 * @ vaddr     : barrier virtual address in user space == identifier.
214 * @ operation : BARRIER_INIT / BARRIER_DESTROY / BARRIER_WAIT.
215 * @ count     : number of expected threads (only used by BARRIER_INIT operation).
216 * @ return 0 if success / return -1 if failure.
217 ********************************************************************************************/
218int sys_barrier( void     * vaddr,
219                 uint32_t   operation,
220                 uint32_t   count );
221
222typedef enum
223{
224        BARRIER_INIT,
225        BARRIER_DESTROY,
226        BARRIER_WAIT,
227} 
228barrier_operation_t;
229
230/*********************************************************************************************
231 * [9] This function implement all operations on a POSIX mutex.
232 * The kernel structure representing a barrier is defined in the remote_barrier.h file.
233 * The code implementting the operations is defined in the remote_barrier.c file.
234 *********************************************************************************************
235 * @ vaddr     : mutex virtual address in user space == identifier.
236 * @ operation : MUTEX_INIT / MUTEX_DESTROY / MUTEX_LOCK / MUTEX_UNLOCK
237 * @ attr      : mutex attributes (non supported yet => must be 0).
238 * @ return 0 if success / return -1 if failure.
239 ********************************************************************************************/
240int sys_mutex( void     * vaddr,
241               uint32_t   operation,
242               uint32_t   count );
243
244typedef enum
245{
246        MUTEX_INIT,
247        MUTEX_DESTROY,
248        MUTEX_LOCK,
249        MUTEX_UNLOCK,
250} 
251mutex_operation_t;
252
253/*********************************************************************************************
254 * [10] This function block the calling thread on the THREAD_BLOCKED_GLOBAL condition,
255 * and deschedule.
256 *********************************************************************************************
257 * @ return 0 if success / returns -1 if failure.
258 ********************************************************************************************/
259int sys_thread_sleep();
260
261/*********************************************************************************************
262 * [11] This function unblock the thread identified by its <trdid> from the
263 * THREAD_BLOCKED_GLOBAL condition.
264 *********************************************************************************************
265 * @ trdid  : target thread identifier.
266 * @ return 0 if success / return -1 if failure.
267 ********************************************************************************************/
268int sys_thread_wakeup();
269
270/*********************************************************************************************
271 * [12] This function open or create a file.
272 *********************************************************************************************
273 * @ pathname   : pathname (can be relative or absolute).
274 * @ flags      : bit vector attributes (see below).
275 * @ mode       : access rights.
276 * @ return file descriptor index in fd_array if success / return -1 if failure.
277 ********************************************************************************************/
278int sys_open( char    * pathname,
279              uint32_t  flags,
280              uint32_t  mode );
281
282typedef enum
283{
284    O_RDONLY   = 0x0010000,    /*! open file in read-only mode                              */
285    O_WRONLY   = 0x0020000,    /*! open file in write-only mode                             */
286    O_RDWR     = 0x0030000,    /*! open file in read/write mode                             */
287    O_NONBLOCK = 0x0040000,    /*! do not block if data non available                       */
288    O_APPEND   = 0x0080000,    /*! append on each write                                     */
289    O_CREAT    = 0x0100000,    /*! create file if it does not exist                         */
290    O_TRUNC    = 0x0200000,    /*! file length is forced to 0                               */
291    O_EXCL     = 0x0400000,    /*! error if VFS_O_CREAT and file exist                      */
292    O_SYNC         = 0x0800000,    /*! synchronize File System on each write                    */
293    O_CLOEXEC  = 0x1000000,    /*! set the close-on-exec flag in file descriptor            */
294    O_DIR      = 0x2000000,    /*! new file descriptor is for a directory                   */
295}
296open_attributes_t;
297
298/*********************************************************************************************
299 * [13] This function creates a new file as specified by the arguments.
300 * This function is obsolete, you should use open() with 0_CREATE.
301 *********************************************************************************************
302 * @ pathname   : pathname (can be relative or absolute).
303 * @ mode       : access rights.
304 ********************************************************************************************/
305int sys_creat( char     * pathname,
306               uint32_t   mode );
307
308/*********************************************************************************************
309 * [14] This function read bytes from an open file identified by its file descriptor.
310 * This file can be a regular file or character oriented device.
311 *********************************************************************************************
312 * @ file_id  : open file index in fd_array.
313 * @ buf      : buffer virtual address in user space.
314 * @ count    : number of bytes.
315 * @ return number of bytes actually read if success / returns -1 if failure.
316 ********************************************************************************************/
317int sys_read( uint32_t   file_id,
318              void     * buf,
319              uint32_t   count );
320
321/*********************************************************************************************
322 * [15] This function writes bytes to an open file identified by its file descriptor.
323 * This file can be a regular file or character oriented device.
324 *********************************************************************************************
325 * @ file_id  : open file index in fd_array.
326 * @ buf      : buffer virtual address in user space.
327 * @ count    : number of bytes.
328 * @ return number of bytes actually written if success / returns -1 if failure.
329 ********************************************************************************************/
330int sys_write( uint32_t   file_id,
331               void     * buf,
332               uint32_t   count );
333
334/*********************************************************************************************
335 * [16] This function epositions the offset of the file descriptor identified by <file_id>,
336 * according to the operation type defined by the <whence> and <offset> arguments.
337 *********************************************************************************************
338 * @ file_id  : open file index in fd_array.
339 * @ offset   : buffer virtual address in user space.
340 * @ whence   : operation type (see below).
341 * @ return 0 if success / returns -1 if failure.
342 ********************************************************************************************/
343int sys_lseek( xptr_t    file_id,
344               uint32_t  offset,
345               uint32_t  whence );
346
347typedef enum
348{
349    SEEK_SET  = 0,     /*! new_offset <= offset                                             */
350    SEEK_CUR  = 1,     /*! new_offset <= current_offset + offset                            */
351    SEEK_END  = 2,     /*! new_iffset <= current_size + offset                              */
352}
353lseek_operation_t;
354
355/*********************************************************************************************
356 * [17] This function release the memory allocated for the file descriptor identified by
357 * the <file_id> argument, and remove the fd array_entry in all copies of the process
358 * descriptor.
359 *********************************************************************************************
360  file_id   : file descriptor index in fd_array.
361 * @ return 0 if success / returns -1 if failure.
362 ********************************************************************************************/
363int sys_close( uint32_t file_id );
364
365/*********************************************************************************************
366 * [18] This function removes a directory entry identified by the <pathname> from its
367 * directory, and decrement the link count of the file referenced by the link.
368 * If the link count reduces to zero, and no process has the file open, then all resources
369 * associated with the file are reclaimed.  If one or more process have the file open when
370 * the last link is removed, the link is removed, but the removal of the file is delayed
371 * until all references to it have been closed.
372 *********************************************************************************************
373 * @ pathname   : pathname (can be relative or absolute).
374 * @ return 0 if success / returns -1 if failure.
375 ********************************************************************************************/
376int sys_unlink( char * pathname );
377
378/*********************************************************************************************
379 * [19] This function creates in the calling thread cluster an unnamed pipe, and two
380 * (read and write) file descriptors.
381 *********************************************************************************************
382 * @ file_id[0] : [out] read only file descriptor index.
383 * @ file_id[1] : [out] write only file descriptor index.
384 * @ return 0 if success / return -1 if failure.
385 ********************************************************************************************/
386int sys_pipe( uint32_t file_id[2] );
387
388/*********************************************************************************************
389 * [20] This function change the current working directory in reference process descriptor.
390 *********************************************************************************************
391 * @ pathname   : pathname (can be relative or absolute).
392 * @ return 0 if success / returns -1 if failure.
393 ********************************************************************************************/
394int sys_chdir( char * pathname );
395
396/*********************************************************************************************
397 * [21] This function creates a new directory in file system.
398 *********************************************************************************************
399 * @ pathname   : pathname (can be relative or absolute).
400 * @ mode       : access rights (as defined in chmod).
401 * @ return 0 if success / returns -1 if failure.
402 ********************************************************************************************/
403int sys_mkdir( char      pathname,
404               uint32_t  mode );
405
406/*********************************************************************************************
407 * [22] This function creates a named FIFO file in the calling thread cluster.
408 * The associated read and write file descriptors mut be be  explicitely created
409 * using the sy_open() function.
410 *********************************************************************************************
411 * @ pathname   : pathname (can be relative or absolute).
412 * @ mode       : access rights (as defined in chmod).
413 * @ return 0 if success / returns -1 if failure.
414 ********************************************************************************************/
415int sys_mkfifo( char     * pathname,
416                uint32_t   mode );
417
418/*********************************************************************************************
419 * [23] This function open a directory, that must exist in the file system.
420 *********************************************************************************************
421 * @ pathname   : pathname (can be relative or absolute).
422 * @ return file descriptor index in fd_array if success / return -1 if failure.
423 ********************************************************************************************/
424int sys_opendir( char * pathname );
425
426/*********************************************************************************************
427 * [24] This function returns in the structure pointed by the <dirent> argument various
428 * information about an entry of the directory identified by the <file_id> argument.
429 *********************************************************************************************
430 * @ file_id   : file descriptor index of the searched directory.
431 * @ dirent    : pointer on a dirent structure in user space.
432 * @ return 0 if success / returns -1 if failure.
433 ********************************************************************************************/
434int sys_readdir( uint32_t              file_id,
435                 struct vfs_dirent_s * dirent );
436
437/*********************************************************************************************
438 * [25] This function close the file descriptor previouly open by the opendir() function.
439 *********************************************************************************************
440 * @ file_id   : file descriptor index of the searched directory.
441 * @ return 0 if success / returns -1 if failure.
442 ********************************************************************************************/
443int sys_closedir( uint32_t file_id );
444
445/*********************************************************************************************
446 * [26] This function returns the pathname of the current working directory.
447 *********************************************************************************************
448 * buf     : buffer addres in user space.
449 * nbytes  : user buffer size in bytes.
450 * @ return 0 if success / returns -1 if failure.
451 ********************************************************************************************/
452int sys_getcwd( char     * buf,
453                uint32_t   nbytes );
454
455/*********************************************************************************************
456 * [27] This function returns in a 64 bits user buffer the calling core cycles count.
457 * It uses both the hardware register and the core descriptor cycles count tos take
458 * into account a possible harware register overflow  in 32 bits architectures.
459 *********************************************************************************************
460 * cyles    : [out] address of buffer in user space.
461 ********************************************************************************************/
462int sys_clock( uint64_t * cycles );
463
464/*********************************************************************************************
465 * [28] This function forces the calling thread to sleep, for a fixed number of cycles.
466 *********************************************************************************************
467 * cycles   : number of cycles.
468 ********************************************************************************************/
469int sys_alarm( uint32_t cycles );
470
471/*********************************************************************************************
472 * [29] This undefined function does nothing.
473 *********************************************************************************************
474 * @ pathname   : pathname (can be relative or absolute).
475 * @ return 0 if success / returns -1 if failure.
476 ********************************************************************************************/
477int sys_rmdir( char * pathname ); 
478
479/*********************************************************************************************
480 * [30] This function implement the operations related to User Thread Local Storage.
481 * It is actually implemented as an uint32_t variable in the thread descriptor.
482 *********************************************************************************************
483 * @ operation  : UTLS operation type as defined below.
484 * @ value      : argument value for the UTLS_SET operation.
485 * @ return value for the UTLS_GET and UTLS_GET_ERRNO / return -1 if failure.
486 ********************************************************************************************/
487int sys_utls( uint32_t operation,
488              uint32_t value );
489
490typedef enum
491{
492    UTLS_SET       = 1,
493    UTLS_GET       = 2,
494    UTLS_GET_ERRNO = 3,
495}
496utls_operation_t;
497
498/*********************************************************************************************
499 * [31] This function change the acces rights for the file/dir identified by the
500 * pathname argument.
501 *********************************************************************************************
502 * @ pathname   : pathname (can be relative or absolute).
503 * @ rights     : acces rights.
504 * @ return 0 if success / returns -1 if failure.
505 ********************************************************************************************/
506int sys_chmod( char     * pathname,
507               uint32_t   rights );
508
509/*********************************************************************************************
510 * [32] This function associate a specific signal handler to a given signal type.
511 * Tee handlers for the SIGKILL and SIGSTOP signals cannot be redefined.
512 *********************************************************************************************
513 * @ sig_id    : index defining signal type (from 1 to 31).
514 * @ handler   : pointer on fonction implementing the specific handler.
515 * @ return 0 if success / returns -1 if failure.
516 ********************************************************************************************/
517int sys_signal( uint32_t   sig_id,
518                void     * handler );
519
520/*********************************************************************************************
521 * [33] This function returns in the structure <tv>, defined in the time.h file,
522 * the current time (in seconds & micro-seconds).
523 * It is computed from the calling core descriptor.
524 * The timezone is not supported.
525 *********************************************************************************************
526 * @ tv      : pointer on the timeval structure.
527 * @ tz      : pointer on the timezone structure : must be NULL.       
528 * @ return 0 if success / returns -1 if failure.
529 ********************************************************************************************/
530int sys_gettimeofday( struct timeval  * tv,
531                      struct timezone * tz );
532
533/*********************************************************************************************
534 * [34] This function implements the "kill" system call.
535 * It register the signal defined by the <sig_id> argument in all thread descriptors
536 * of a target process identified by the <pid> argument. This is done in all clusters
537 * containing threads for the target process.
538 * It can be executed by any thread running in any cluster, as this function uses
539 * remote access to traverse the list of process copies in the owner cluster,
540 * and the RPC_SIGNAL_RISE to signal the remote threads.
541 *********************************************************************************************
542 * @ pid      : target process identifier.
543 * @ sig_id   : index defining the signal type (from 1 to 31).
544 * @ return 0 if success / returns -1 if failure.
545 ********************************************************************************************/
546int sys_kill( pid_t    pid,
547              uint32_t sig_id );
548
549/*********************************************************************************************
550 * [35] This function implements the "getpid" system call.
551 *********************************************************************************************
552 * @ returns the PID for the calling thread.
553 ********************************************************************************************/
554int sys_getpid();
555
556/*********************************************************************************************
557 * [36] This function implement the "fork" system call.
558 * The calling process descriptor (parent process), and the associated thread descriptor are
559 * replicated in the same cluster as the calling thread, but the new process (child process)
560 * is registered in another target cluster, that is the new process owner.
561 * The child process and the associated main thread will be migrated to the target cluster
562 * later, when the child process makes an "exec" or any other system call.
563 * The target cluster depends on the "fork_user" flag and "fork_cxy" variable that can be
564 * stored in the calling thread descriptor by the specific fork_place() system call.
565 * If not, the sys_fork() function makes a query to the DQDT to select the target cluster.
566 *********************************************************************************************
567 * @ returns child process PID if success / returns -1 if failure
568 ********************************************************************************************/
569int sys_fork();
570
571/*********************************************************************************************
572 * [37] This function implement the "exec" system call.
573 * It is executed in the client cluster, but the new process descriptor and main thread
574 * must be created in a server cluster, that is generally another cluster.
575 * - if the server_cluster is the client cluster, call directly the process_make_exec()
576 *   function to create a new process, and launch a new thread in local cluster.
577 * - if the target_cluster is remote, call rpc_process_exec_client() to execute the
578 *   process_make_exec() on the remote cluster.
579 * In both case this function build an exec_info_t structure containing all informations
580 * required to build the new process descriptor and the associated thread.
581 * Finally, the calling process and thread are deleted.
582 *********************************************************************************************
583 * @ filename : string pointer on .elf filename (virtual pointer in user space)
584 * @ argv     : array of strings on process arguments (virtual pointers in user space)
585 * @ envp     : array of strings on Renvironment variables (virtual pointers in user space)
586 * @ returns O if success / returns -1 if failure.
587 ********************************************************************************************/
588int sys_exec( char  * filename,
589              char ** argv,
590              char ** envp );
591
592/*********************************************************************************************
593 * [38] This function  returns in the <stat> structure, defined in the vfs.h file,
594 * various informations on the file/directory identified by the <file_id> argument.
595 *********************************************************************************************
596 * @ file_id   : file descriptor index in fd_array.
597 * @ stat      : pointer on the stat structure.
598 * @ returns O if success / returns -1 if failure.
599 ********************************************************************************************/
600int sys_stat( uint32_t            file_id,
601              struct vfs_stat_s * stat );
602
603/*********************************************************************************************
604 * [39] This function is used to activate / desactivate Rthe trace for a thread
605 * identified by the <trdid> and <pid> arguments.
606 * It can be called by any other thread.
607 *********************************************************************************************
608 * @ operation  : operation type as defined below.
609 * @ pid        : process identifier.
610 * @ trdid      : thread identifier.
611 * @ returns O if success / returns -1 if failure.
612 ********************************************************************************************/
613int sys_trace( uint32_t operation,
614               pid_t    pid, 
615               uint32_t trdid );
616
617typedef enum
618{
619    TRACE_ON       = 0,
620    TRACE_OFF      = 1,
621}
622trace_operation_t;
623
624
625#endif  // _SYSCALLS_H_
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