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001 /* Copyright (C) 2005 David Decotigny 001 /* Copyright (C) 2005 David Decotigny 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 018 019 #include <sos/assert.h> 019 #include <sos/assert.h> 020 #include <sos/list.h> 020 #include <sos/list.h> 021 #include <sos/kmem_slab.h> 021 #include <sos/kmem_slab.h> 022 #include <hwcore/irq.h> 022 #include <hwcore/irq.h> 023 #include <drivers/bochs.h> 023 #include <drivers/bochs.h> 024 024 025 #include <sos/umem_vmm.h> 025 #include <sos/umem_vmm.h> 026 026 027 #include "process.h" 027 #include "process.h" 028 028 029 !! 029 #define SOS_PROCESS_MAX_OPENED_FILES 64 030 #define SOS_PROCESS_MAX_NAMELEN 32 !! 030 #define SOS_PROCESS_MAX_NAMELEN 32 031 031 032 032 033 /** 033 /** 034 * Definition of a process in SOS. A process i 034 * Definition of a process in SOS. A process is basically the 035 * collection of all the resources requested b 035 * collection of all the resources requested by a user program. The 036 * threads are one of these resources, the mm_ 036 * threads are one of these resources, the mm_context is one other 037 * example of such resources. 037 * example of such resources. 038 */ 038 */ 039 struct sos_process 039 struct sos_process 040 { 040 { 041 char name[SOS_PROCESS_MAX_NAMELEN]; 041 char name[SOS_PROCESS_MAX_NAMELEN]; 042 042 043 /** First important resource: the address sp 043 /** First important resource: the address space */ 044 struct sos_umem_vmm_as *address_space; 044 struct sos_umem_vmm_as *address_space; 045 045 046 /** Second important resource: the CPU execu 046 /** Second important resource: the CPU execution contexts, aka the 047 threads executing in the context of this 047 threads executing in the context of this process. */ 048 struct sos_thread *thread_list; 048 struct sos_thread *thread_list; 049 sos_count_t nb_threads; 049 sos_count_t nb_threads; 050 050 051 /** Reference counter, including threads */ 051 /** Reference counter, including threads */ 052 sos_count_t ref_cnt; 052 sos_count_t ref_cnt; 053 053 >> 054 /** The array of opened file descriptors */ >> 055 struct sos_fs_opened_file * fds[SOS_PROCESS_MAX_OPENED_FILES]; >> 056 >> 057 /** Where the root of the process is (for chroot support). May be NULL */ >> 058 struct sos_fs_opened_file * root; >> 059 >> 060 /** Where the current working dir of the process is */ >> 061 struct sos_fs_opened_file * cwd; >> 062 054 struct sos_process *prev, *next; 063 struct sos_process *prev, *next; 055 }; 064 }; 056 065 057 066 058 /** The list of processes in the system */ 067 /** The list of processes in the system */ 059 static struct sos_process *process_list = NULL 068 static struct sos_process *process_list = NULL; 060 069 061 070 062 /** The cache for the sos_process structures * 071 /** The cache for the sos_process structures */ 063 struct sos_kslab_cache *cache_struct_process; 072 struct sos_kslab_cache *cache_struct_process; 064 073 065 074 066 /** 075 /** 067 * Helper function for debugging purposes 076 * Helper function for debugging purposes 068 */ 077 */ 069 void sos_process_dumplist() !! 078 void sos_process_dumplist(void) 070 { 079 { 071 struct sos_thread * cur_thr = sos_thread_get 080 struct sos_thread * cur_thr = sos_thread_get_current(); 072 struct sos_process * proc; 081 struct sos_process * proc; 073 int nb_procs; 082 int nb_procs; 074 083 075 sos_bochs_printf("<ps>\n"); 084 sos_bochs_printf("<ps>\n"); 076 list_foreach(process_list, proc, nb_procs) 085 list_foreach(process_list, proc, nb_procs) 077 { 086 { 078 struct sos_thread * thr; 087 struct sos_thread * thr; 079 int nb_thrs; 088 int nb_thrs; 080 089 081 sos_bochs_printf(" proc@%p: '%s', %d th 090 sos_bochs_printf(" proc@%p: '%s', %d threads, %d refs\n", 082 proc, proc->name?proc-> 091 proc, proc->name?proc->name:"(none)", 083 proc->nb_threads, proc- 092 proc->nb_threads, proc->ref_cnt); 084 093 085 list_foreach_forward_named(proc->thread_ 094 list_foreach_forward_named(proc->thread_list, thr, nb_thrs, 086 prev_in_proce 095 prev_in_process, next_in_process) 087 { 096 { 088 if (thr == cur_thr) 097 if (thr == cur_thr) 089 sos_bochs_printf(" thr@%p: [CUR 098 sos_bochs_printf(" thr@%p: [CURRENT]\n", thr); 090 else 099 else 091 sos_bochs_printf(" thr@%p: %cst 100 sos_bochs_printf(" thr@%p: %cstate=%d eip=%p\n", 092 thr, 101 thr, 093 sos_cpu_context_i 102 sos_cpu_context_is_in_user_mode(thr->cpu_state)?'u':'k', 094 thr->state, 103 thr->state, 095 (void*)sos_cpu_co 104 (void*)sos_cpu_context_get_PC(thr->cpu_state)); 096 } 105 } 097 } 106 } 098 sos_bochs_printf(" ======= %d processes === 107 sos_bochs_printf(" ======= %d processes =======\n", nb_procs); 099 sos_bochs_printf("</ps>\n"); 108 sos_bochs_printf("</ps>\n"); 100 } 109 } 101 110 102 111 103 sos_ret_t sos_process_subsystem_setup() 112 sos_ret_t sos_process_subsystem_setup() 104 { 113 { 105 /* Create the cache for the process structur 114 /* Create the cache for the process structures */ 106 cache_struct_process = sos_kmem_cache_create 115 cache_struct_process = sos_kmem_cache_create("struct_process", 107 116 sizeof(struct sos_process), 108 117 3, 109 118 0, 110 119 SOS_KSLAB_CREATE_MAP 111 120 | SOS_KSLAB_CREATE_ZERO); 112 if (! cache_struct_process) 121 if (! cache_struct_process) 113 return -SOS_ENOMEM; 122 return -SOS_ENOMEM; 114 123 115 return SOS_OK; 124 return SOS_OK; 116 } 125 } 117 126 118 127 119 struct sos_process *sos_process_create(const c 128 struct sos_process *sos_process_create(const char *name, 120 sos_boo 129 sos_bool_t do_copy_current_process) 121 { 130 { >> 131 sos_ret_t retval = SOS_OK; 122 sos_ui32_t flags; 132 sos_ui32_t flags; 123 struct sos_process *proc; 133 struct sos_process *proc; 124 134 >> 135 125 proc = (struct sos_process*) sos_kmem_cache_ 136 proc = (struct sos_process*) sos_kmem_cache_alloc(cache_struct_process, 0); 126 if (! proc) 137 if (! proc) 127 return NULL; 138 return NULL; 128 139 129 /* proc is already filled with 0 (cache has 140 /* proc is already filled with 0 (cache has SOS_KSLAB_CREATE_ZERO 130 flag) */ 141 flag) */ 131 142 >> 143 /* Copy the file descriptors when needed */ >> 144 if (do_copy_current_process) >> 145 { >> 146 struct sos_process * myself = sos_thread_get_current()->process; >> 147 int fd; >> 148 >> 149 for (fd = 0 ; fd < SOS_PROCESS_MAX_OPENED_FILES ; fd++) >> 150 if (NULL != myself->fds[fd]) >> 151 { >> 152 retval = sos_fs_duplicate_opened_file(myself->fds[fd], >> 153 proc, >> 154 & proc->fds[fd]); >> 155 if (SOS_OK != retval) >> 156 goto end_create_proc; >> 157 } >> 158 >> 159 retval = sos_fs_duplicate_opened_file(myself->root, >> 160 proc, >> 161 & proc->root); >> 162 if (SOS_OK != retval) >> 163 goto end_create_proc; >> 164 >> 165 retval = sos_fs_duplicate_opened_file(myself->cwd, >> 166 proc, >> 167 & proc->cwd); >> 168 if (SOS_OK != retval) >> 169 goto end_create_proc; >> 170 } >> 171 132 if (do_copy_current_process) 172 if (do_copy_current_process) 133 proc->address_space = sos_umem_vmm_duplica 173 proc->address_space = sos_umem_vmm_duplicate_current_thread_as(proc); 134 else 174 else 135 proc->address_space = sos_umem_vmm_create_ 175 proc->address_space = sos_umem_vmm_create_empty_as(proc); 136 176 137 if (NULL == proc->address_space) 177 if (NULL == proc->address_space) 138 { 178 { 139 /* Error */ 179 /* Error */ 140 sos_kmem_cache_free((sos_vaddr_t)proc); !! 180 retval = -SOS_ENOMEM; 141 return NULL; !! 181 goto end_create_proc; 142 } 182 } 143 183 144 if (!name) 184 if (!name) 145 { 185 { 146 struct sos_thread * cur_thr = sos_thread 186 struct sos_thread * cur_thr = sos_thread_get_current(); 147 if (do_copy_current_process) 187 if (do_copy_current_process) 148 name = cur_thr->process->name; 188 name = cur_thr->process->name; 149 else 189 else 150 name = "[UNNAMED]"; 190 name = "[UNNAMED]"; 151 } 191 } 152 192 153 strzcpy(proc->name, name, SOS_PROCESS_MAX_NA 193 strzcpy(proc->name, name, SOS_PROCESS_MAX_NAMELEN); 154 194 155 /* Add it to the global list of processes */ 195 /* Add it to the global list of processes */ 156 sos_disable_IRQs(flags); 196 sos_disable_IRQs(flags); 157 list_add_tail(process_list, proc); 197 list_add_tail(process_list, proc); 158 sos_restore_IRQs(flags); 198 sos_restore_IRQs(flags); 159 199 160 /* Mark the process as referenced */ 200 /* Mark the process as referenced */ 161 proc->ref_cnt = 1; 201 proc->ref_cnt = 1; >> 202 >> 203 end_create_proc: >> 204 if (SOS_OK != retval) >> 205 { >> 206 int fd; >> 207 >> 208 /* Close the file descriptors */ >> 209 for (fd = 0 ; fd < SOS_PROCESS_MAX_OPENED_FILES ; fd++) >> 210 if (NULL != proc->fds[fd]) >> 211 { >> 212 sos_fs_close(proc->fds[fd]); >> 213 proc->fds[fd] = NULL; >> 214 } >> 215 >> 216 if (proc->root) >> 217 sos_fs_close(proc->root); >> 218 if (proc->cwd) >> 219 sos_fs_close(proc->cwd); >> 220 proc->root = proc->cwd = NULL; >> 221 >> 222 sos_kmem_cache_free((sos_vaddr_t) proc); >> 223 proc = NULL; >> 224 } >> 225 162 return proc; 226 return proc; 163 } 227 } 164 228 165 229 166 inline 230 inline 167 sos_ret_t sos_process_ref(struct sos_process * 231 sos_ret_t sos_process_ref(struct sos_process *proc) 168 { 232 { 169 sos_ui32_t flags; 233 sos_ui32_t flags; 170 sos_disable_IRQs(flags); 234 sos_disable_IRQs(flags); 171 proc->ref_cnt ++; 235 proc->ref_cnt ++; 172 sos_restore_IRQs(flags); 236 sos_restore_IRQs(flags); 173 return SOS_OK; 237 return SOS_OK; 174 } 238 } 175 239 176 240 177 sos_count_t sos_process_get_nb_threads(const s 241 sos_count_t sos_process_get_nb_threads(const struct sos_process *proc) 178 { 242 { 179 sos_count_t retval; 243 sos_count_t retval; 180 sos_ui32_t flags; 244 sos_ui32_t flags; 181 sos_disable_IRQs(flags); 245 sos_disable_IRQs(flags); 182 retval = proc->nb_threads; 246 retval = proc->nb_threads; 183 sos_restore_IRQs(flags); 247 sos_restore_IRQs(flags); 184 return retval; 248 return retval; 185 } 249 } 186 250 187 251 188 struct sos_mm_context * 252 struct sos_mm_context * 189 sos_process_get_mm_context(const struct sos_pr 253 sos_process_get_mm_context(const struct sos_process *proc) 190 { 254 { 191 return sos_umem_vmm_get_mm_context(proc->add 255 return sos_umem_vmm_get_mm_context(proc->address_space); 192 } 256 } 193 257 194 258 195 struct sos_umem_vmm_as * 259 struct sos_umem_vmm_as * 196 sos_process_get_address_space(const struct sos 260 sos_process_get_address_space(const struct sos_process *proc) 197 { 261 { 198 return proc->address_space; 262 return proc->address_space; 199 } 263 } 200 264 201 265 202 sos_ret_t sos_process_set_address_space(struct 266 sos_ret_t sos_process_set_address_space(struct sos_process *proc, 203 struct 267 struct sos_umem_vmm_as *new_as) 204 { 268 { >> 269 int fd; >> 270 >> 271 /* Close the FD that are not allowed to be duplicated */ >> 272 for (fd = 0 ; fd < SOS_PROCESS_MAX_OPENED_FILES ; fd++) >> 273 if ( (NULL != proc->fds[fd]) >> 274 && (proc->fds[fd]->open_flags & SOS_FS_OPEN_CLOSEONEXEC) ) >> 275 { >> 276 sos_fs_close(proc->fds[fd]); >> 277 proc->fds[fd] = NULL; >> 278 } >> 279 205 if (proc->address_space) 280 if (proc->address_space) 206 { 281 { 207 sos_ret_t retval = sos_umem_vmm_delete_a 282 sos_ret_t retval = sos_umem_vmm_delete_as(proc->address_space); 208 if (SOS_OK != retval) 283 if (SOS_OK != retval) 209 return retval; 284 return retval; 210 } 285 } 211 286 212 proc->address_space = new_as; 287 proc->address_space = new_as; 213 return SOS_OK; 288 return SOS_OK; 214 } 289 } 215 290 216 291 >> 292 struct sos_fs_opened_file * >> 293 sos_process_get_root(const struct sos_process *proc) >> 294 { >> 295 return proc->root; >> 296 } >> 297 >> 298 >> 299 struct sos_fs_opened_file * >> 300 sos_process_get_cwd(const struct sos_process *proc) >> 301 { >> 302 return proc->cwd; >> 303 } >> 304 >> 305 >> 306 struct sos_fs_opened_file * >> 307 sos_process_get_opened_file(const struct sos_process *proc, >> 308 int fd) >> 309 { >> 310 if ((fd < 0) || (fd >= SOS_PROCESS_MAX_OPENED_FILES)) >> 311 return NULL; >> 312 return proc->fds[fd]; >> 313 } >> 314 >> 315 >> 316 sos_ret_t >> 317 sos_process_chroot(struct sos_process *proc, >> 318 struct sos_fs_opened_file * new_root, >> 319 struct sos_fs_opened_file ** old_root) >> 320 { >> 321 *old_root = proc->root; >> 322 proc->root = new_root; >> 323 >> 324 return SOS_OK; >> 325 } >> 326 >> 327 >> 328 sos_ret_t >> 329 sos_process_chdir(struct sos_process *proc, >> 330 struct sos_fs_opened_file * new_cwd, >> 331 struct sos_fs_opened_file ** old_cwd) >> 332 { >> 333 *old_cwd = proc->cwd; >> 334 proc->cwd = new_cwd; >> 335 >> 336 return SOS_OK; >> 337 } >> 338 >> 339 >> 340 sos_ret_t >> 341 sos_process_register_opened_file(struct sos_process *proc, >> 342 struct sos_fs_opened_file * of) >> 343 { >> 344 int i; >> 345 for (i = 0 ; i < SOS_PROCESS_MAX_OPENED_FILES ; i++) >> 346 if (NULL == proc->fds[i]) >> 347 { >> 348 proc->fds[i] = of; >> 349 return i; >> 350 } >> 351 >> 352 return -SOS_EMFILE; >> 353 } >> 354 >> 355 >> 356 sos_ret_t >> 357 sos_process_unregister_opened_file(struct sos_process *proc, >> 358 int fd) >> 359 { >> 360 if ((fd < 0) || (fd >= SOS_PROCESS_MAX_OPENED_FILES)) >> 361 return -SOS_EBADF; >> 362 >> 363 proc->fds[fd] = NULL; >> 364 return SOS_OK; >> 365 } >> 366 >> 367 >> 368 217 /* ******************************************* 369 /* *************************************************** 218 * Restricted functions 370 * Restricted functions 219 */ 371 */ 220 372 221 373 222 sos_ret_t sos_process_register_thread(struct s 374 sos_ret_t sos_process_register_thread(struct sos_process *in_proc, 223 struct s 375 struct sos_thread *thr) 224 { 376 { 225 sos_ui32_t flags; 377 sos_ui32_t flags; 226 378 227 /* The process is assumed to be referenced b 379 /* The process is assumed to be referenced by somebody */ 228 SOS_ASSERT_FATAL(in_proc->ref_cnt > 0); 380 SOS_ASSERT_FATAL(in_proc->ref_cnt > 0); 229 381 230 /* Only threads that are being created are a 382 /* Only threads that are being created are allowed to be attached to 231 a process */ 383 a process */ 232 SOS_ASSERT_FATAL(thr->state == SOS_THR_CREAT 384 SOS_ASSERT_FATAL(thr->state == SOS_THR_CREATED); 233 385 234 /* Update the list of the threads in the pro 386 /* Update the list of the threads in the process */ 235 thr->process = in_proc; 387 thr->process = in_proc; 236 388 237 /* Increment the reference count for the pro 389 /* Increment the reference count for the process */ 238 sos_process_ref(in_proc); 390 sos_process_ref(in_proc); 239 391 240 /* Add the thread to the process thread's li 392 /* Add the thread to the process thread's list */ 241 sos_disable_IRQs(flags); 393 sos_disable_IRQs(flags); 242 list_add_tail_named(in_proc->thread_list, th 394 list_add_tail_named(in_proc->thread_list, thr, 243 prev_in_process, next_in 395 prev_in_process, next_in_process); 244 in_proc->nb_threads ++; 396 in_proc->nb_threads ++; 245 sos_restore_IRQs(flags); 397 sos_restore_IRQs(flags); 246 398 247 return SOS_OK; 399 return SOS_OK; 248 } 400 } 249 401 250 402 251 /** The function responsible for releasing the 403 /** The function responsible for releasing the resources held by the 252 process. */ 404 process. */ 253 sos_ret_t sos_process_unref(struct sos_process 405 sos_ret_t sos_process_unref(struct sos_process *proc) 254 { 406 { 255 sos_ui32_t flags; 407 sos_ui32_t flags; 256 sos_ret_t retval; 408 sos_ret_t retval; >> 409 int fd; 257 410 258 SOS_ASSERT_FATAL(proc->ref_cnt > 0); 411 SOS_ASSERT_FATAL(proc->ref_cnt > 0); 259 412 260 sos_disable_IRQs(flags); 413 sos_disable_IRQs(flags); 261 proc->ref_cnt --; 414 proc->ref_cnt --; 262 if (proc->ref_cnt > 0) 415 if (proc->ref_cnt > 0) 263 { 416 { 264 sos_restore_IRQs(flags); 417 sos_restore_IRQs(flags); 265 return -SOS_EBUSY; 418 return -SOS_EBUSY; 266 } 419 } 267 list_delete(process_list, proc); 420 list_delete(process_list, proc); 268 sos_restore_IRQs(flags); 421 sos_restore_IRQs(flags); >> 422 >> 423 /* Close the file descriptors */ >> 424 for (fd = 0 ; fd < SOS_PROCESS_MAX_OPENED_FILES ; fd++) >> 425 if (NULL != proc->fds[fd]) >> 426 { >> 427 sos_fs_close(proc->fds[fd]); >> 428 proc->fds[fd] = NULL; >> 429 } >> 430 >> 431 sos_fs_close(proc->root); >> 432 sos_fs_close(proc->cwd); >> 433 proc->root = proc->cwd = NULL; 269 434 270 /* First: free the user address space */ 435 /* First: free the user address space */ 271 retval = sos_umem_vmm_delete_as(proc->addres 436 retval = sos_umem_vmm_delete_as(proc->address_space); 272 SOS_ASSERT_FATAL(SOS_OK == retval); 437 SOS_ASSERT_FATAL(SOS_OK == retval); 273 438 274 /* Free the process structure */ 439 /* Free the process structure */ 275 sos_kmem_cache_free((sos_vaddr_t)proc); 440 sos_kmem_cache_free((sos_vaddr_t)proc); 276 441 277 return SOS_OK; 442 return SOS_OK; 278 } 443 } 279 444 280 445 281 sos_ret_t sos_process_unregister_thread(struct 446 sos_ret_t sos_process_unregister_thread(struct sos_thread *thr) 282 { 447 { 283 sos_ui32_t flags; 448 sos_ui32_t flags; 284 struct sos_process * in_proc = thr->process; 449 struct sos_process * in_proc = thr->process; 285 450 286 SOS_ASSERT_FATAL(thr->state == SOS_THR_ZOMBI 451 SOS_ASSERT_FATAL(thr->state == SOS_THR_ZOMBIE); 287 452 288 /* Update the list of the threads in the pro 453 /* Update the list of the threads in the process */ 289 thr->process = NULL; 454 thr->process = NULL; 290 sos_disable_IRQs(flags); 455 sos_disable_IRQs(flags); 291 list_delete_named(in_proc->thread_list, thr, 456 list_delete_named(in_proc->thread_list, thr, 292 prev_in_process, next_in_p 457 prev_in_process, next_in_process); 293 SOS_ASSERT_FATAL(in_proc->nb_threads > 0); 458 SOS_ASSERT_FATAL(in_proc->nb_threads > 0); 294 in_proc->nb_threads --; 459 in_proc->nb_threads --; 295 sos_restore_IRQs(flags); 460 sos_restore_IRQs(flags); 296 461 297 /* Unreference the process */ 462 /* Unreference the process */ 298 sos_process_unref(in_proc); 463 sos_process_unref(in_proc); 299 464 300 return SOS_OK; 465 return SOS_OK; 301 } 466 } 302 467 303 468 304 sos_ret_t sos_process_set_name(struct sos_proc 469 sos_ret_t sos_process_set_name(struct sos_process * proc, 305 const char * ne 470 const char * new_name) 306 { 471 { 307 strzcpy(proc->name, new_name, SOS_PROCESS_MA 472 strzcpy(proc->name, new_name, SOS_PROCESS_MAX_NAMELEN); 308 return SOS_OK; 473 return SOS_OK; 309 } 474 }
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