root/kernel/sys.c

/* */

DEFINITIONS

1. sys_ni_syscall
2. sys_idle
3. proc_sel
4. sys_setpriority
5. sys_getpriority
6. sys_profil
7. sys_ftime
8. sys_break
9. sys_stty
10. sys_gtty
11. sys_prof
12. sys_reboot
13. ctrl_alt_del
14. sys_setregid
15. sys_setgid
16. sys_acct
17. sys_phys
18. sys_lock
19. sys_mpx
20. sys_ulimit
21. sys_old_syscall
22. sys_setreuid
23. sys_setuid
24. sys_times
25. sys_brk
26. sys_setpgid
27. sys_getpgid
28. sys_getpgrp
29. sys_setsid
30. sys_getgroups
31. sys_setgroups
32. in_group_p
33. sys_newuname
34. sys_uname
35. sys_olduname
36. sys_sethostname
37. sys_setdomainname
38. sys_getrlimit
39. sys_setrlimit
40. getrusage
41. sys_getrusage
42. sys_umask

   1 /*
   2  *  linux/kernel/sys.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6 
   7 #include <linux/config.h>
   8 #include <linux/errno.h>
   9 #include <linux/sched.h>
  10 #include <linux/kernel.h>
  11 #include <linux/times.h>
  12 #include <linux/utsname.h>
  13 #include <linux/param.h>
  14 #include <linux/resource.h>
  15 #include <linux/signal.h>
  16 #include <linux/string.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/stat.h>
  19 #include <linux/mman.h>
  20 
  21 #include <asm/segment.h>
  22 #include <asm/io.h>
  23 
  24 /*
  25  * this indicates wether you can reboot with ctrl-alt-del: the default is yes
  26  */
  27 static int C_A_D = 1;
  28 
  29 extern void adjust_clock(void);
  30 
  31 #define PZERO   15
  32 
  33 asmlinkage int sys_ni_syscall(void)
     /*  */
  34 {
  35         return -EINVAL;
  36 }
  37 
  38 asmlinkage int sys_idle(void)
     /*  */
  39 {
  40         int i;
  41 
  42         if (current->pid != 0)
  43                 return -EPERM;
  44 
  45         /* Map out the low memory: it's no longer needed */
  46         for (i = 0 ; i < 768 ; i++)
  47                 swapper_pg_dir[i] = 0;
  48 
  49         /* endless idle loop with no priority at all */
  50         current->counter = -100;
  51         for (;;) {
  52                 if (!need_resched)
  53                         __asm__("hlt");
  54                 schedule();
  55         }
  56 }
  57 
  58 static int proc_sel(struct task_struct *p, int which, int who)
     /*  */
  59 {
  60         switch (which) {
  61                 case PRIO_PROCESS:
  62                         if (!who && p == current)
  63                                 return 1;
  64                         return(p->pid == who);
  65                 case PRIO_PGRP:
  66                         if (!who)
  67                                 who = current->pgrp;
  68                         return(p->pgrp == who);
  69                 case PRIO_USER:
  70                         if (!who)
  71                                 who = current->uid;
  72                         return(p->uid == who);
  73         }
  74         return 0;
  75 }
  76 
  77 asmlinkage int sys_setpriority(int which, int who, int niceval)
     /*  */
  78 {
  79         struct task_struct **p;
  80         int error = ESRCH;
  81         int priority;
  82 
  83         if (which > 2 || which < 0)
  84                 return -EINVAL;
  85 
  86         if ((priority = PZERO - niceval) <= 0)
  87                 priority = 1;
  88 
  89         for(p = &LAST_TASK; p > &FIRST_TASK; --p) {
  90                 if (!*p || !proc_sel(*p, which, who))
  91                         continue;
  92                 if ((*p)->uid != current->euid &&
  93                         (*p)->uid != current->uid && !suser()) {
  94                         error = EPERM;
  95                         continue;
  96                 }
  97                 if (error == ESRCH)
  98                         error = 0;
  99                 if (priority > (*p)->priority && !suser())
 100                         error = EACCES;
 101                 else
 102                         (*p)->priority = priority;
 103         }
 104         return -error;
 105 }
 106 
 107 asmlinkage int sys_getpriority(int which, int who)
     /*  */
 108 {
 109         struct task_struct **p;
 110         int max_prio = 0;
 111 
 112         if (which > 2 || which < 0)
 113                 return -EINVAL;
 114 
 115         for(p = &LAST_TASK; p > &FIRST_TASK; --p) {
 116                 if (!*p || !proc_sel(*p, which, who))
 117                         continue;
 118                 if ((*p)->priority > max_prio)
 119                         max_prio = (*p)->priority;
 120         }
 121         return(max_prio ? max_prio : -ESRCH);
 122 }
 123 
 124 asmlinkage int sys_profil(void)
     /*  */
 125 {
 126         return -ENOSYS;
 127 }
 128 
 129 asmlinkage int sys_ftime(void)
     /*  */
 130 {
 131         return -ENOSYS;
 132 }
 133 
 134 asmlinkage int sys_break(void)
     /*  */
 135 {
 136         return -ENOSYS;
 137 }
 138 
 139 asmlinkage int sys_stty(void)
     /*  */
 140 {
 141         return -ENOSYS;
 142 }
 143 
 144 asmlinkage int sys_gtty(void)
     /*  */
 145 {
 146         return -ENOSYS;
 147 }
 148 
 149 asmlinkage int sys_prof(void)
     /*  */
 150 {
 151         return -ENOSYS;
 152 }
 153 
 154 extern void hard_reset_now(void);
 155 
 156 /*
 157  * Reboot system call: for obvious reasons only root may call it,
 158  * and even root needs to set up some magic numbers in the registers
 159  * so that some mistake won't make this reboot the whole machine.
 160  * You can also set the meaning of the ctrl-alt-del-key here.
 161  *
 162  * reboot doesn't sync: do that yourself before calling this.
 163  */
 164 asmlinkage int sys_reboot(int magic, int magic_too, int flag)
     /*  */
 165 {
 166         if (!suser())
 167                 return -EPERM;
 168         if (magic != 0xfee1dead || magic_too != 672274793)
 169                 return -EINVAL;
 170         if (flag == 0x01234567)
 171                 hard_reset_now();
 172         else if (flag == 0x89ABCDEF)
 173                 C_A_D = 1;
 174         else if (!flag)
 175                 C_A_D = 0;
 176         else
 177                 return -EINVAL;
 178         return (0);
 179 }
 180 
 181 /*
 182  * This function gets called by ctrl-alt-del - ie the keyboard interrupt.
 183  * As it's called within an interrupt, it may NOT sync: the only choice
 184  * is wether to reboot at once, or just ignore the ctrl-alt-del.
 185  */
 186 void ctrl_alt_del(void)
     /*  */
 187 {
 188         if (C_A_D)
 189                 hard_reset_now();
 190         else
 191                 send_sig(SIGINT,task[1],1);
 192 }
 193         
 194 
 195 /*
 196  * Unprivileged users may change the real gid to the effective gid
 197  * or vice versa.  (BSD-style)
 198  *
 199  * If you set the real gid at all, or set the effective gid to a value not
 200  * equal to the real gid, then the saved gid is set to the new effective gid.
 201  *
 202  * This makes it possible for a setgid program to completely drop its
 203  * privileges, which is often a useful assertion to make when you are doing
 204  * a security audit over a program.
 205  *
 206  * The general idea is that a program which uses just setregid() will be
 207  * 100% compatible with BSD.  A program which uses just setgid() will be
 208  * 100% compatible with POSIX w/ Saved ID's. 
 209  */
 210 asmlinkage int sys_setregid(gid_t rgid, gid_t egid)
     /*  */
 211 {
 212         int old_rgid = current->gid;
 213 
 214         if (rgid != (gid_t) -1) {
 215                 if ((current->egid==rgid) ||
 216                     (old_rgid == rgid) || 
 217                     suser())
 218                         current->gid = rgid;
 219                 else
 220                         return(-EPERM);
 221         }
 222         if (egid != (gid_t) -1) {
 223                 if ((old_rgid == egid) ||
 224                     (current->egid == egid) ||
 225                     suser())
 226                         current->egid = egid;
 227                 else {
 228                         current->gid = old_rgid;
 229                         return(-EPERM);
 230                 }
 231         }
 232         if (rgid != (gid_t) -1 ||
 233             (egid != (gid_t) -1 && egid != old_rgid))
 234                 current->sgid = current->egid;
 235         return 0;
 236 }
 237 
 238 /*
 239  * setgid() is implemeneted like SysV w/ SAVED_IDS 
 240  */
 241 asmlinkage int sys_setgid(gid_t gid)
     /*  */
 242 {
 243         if (suser())
 244                 current->gid = current->egid = current->sgid = gid;
 245         else if ((gid == current->gid) || (gid == current->sgid))
 246                 current->egid = gid;
 247         else
 248                 return -EPERM;
 249         return 0;
 250 }
 251 
 252 asmlinkage int sys_acct(void)
     /*  */
 253 {
 254         return -ENOSYS;
 255 }
 256 
 257 asmlinkage int sys_phys(void)
     /*  */
 258 {
 259         return -ENOSYS;
 260 }
 261 
 262 asmlinkage int sys_lock(void)
     /*  */
 263 {
 264         return -ENOSYS;
 265 }
 266 
 267 asmlinkage int sys_mpx(void)
     /*  */
 268 {
 269         return -ENOSYS;
 270 }
 271 
 272 asmlinkage int sys_ulimit(void)
     /*  */
 273 {
 274         return -ENOSYS;
 275 }
 276 
 277 asmlinkage int sys_old_syscall(void)
     /*  */
 278 {
 279         return -ENOSYS;
 280 }
 281 
 282 /*
 283  * Unprivileged users may change the real uid to the effective uid
 284  * or vice versa.  (BSD-style)
 285  *
 286  * If you set the real uid at all, or set the effective uid to a value not
 287  * equal to the real uid, then the saved uid is set to the new effective uid.
 288  *
 289  * This makes it possible for a setuid program to completely drop its
 290  * privileges, which is often a useful assertion to make when you are doing
 291  * a security audit over a program.
 292  *
 293  * The general idea is that a program which uses just setreuid() will be
 294  * 100% compatible with BSD.  A program which uses just setuid() will be
 295  * 100% compatible with POSIX w/ Saved ID's. 
 296  */
 297 asmlinkage int sys_setreuid(uid_t ruid, uid_t euid)
     /*  */
 298 {
 299         int old_ruid = current->uid;
 300 
 301         if (ruid != (uid_t) -1) {
 302                 if ((current->euid==ruid) ||
 303                     (old_ruid == ruid) || 
 304                     suser())
 305                         current->uid = ruid;
 306                 else
 307                         return(-EPERM);
 308         }
 309         if (euid != (uid_t) -1) {
 310                 if ((old_ruid == euid) ||
 311                     (current->euid == euid) ||
 312                     suser())
 313                         current->euid = euid;
 314                 else {
 315                         current->uid = old_ruid;
 316                         return(-EPERM);
 317                 }
 318         }
 319         if (ruid != (uid_t) -1 ||
 320             (euid != (uid_t) -1 && euid != old_ruid))
 321                 current->suid = current->euid;
 322         return 0;
 323 }
 324 
 325 /*
 326  * setuid() is implemeneted like SysV w/ SAVED_IDS 
 327  * 
 328  * Note that SAVED_ID's is deficient in that a setuid root program
 329  * like sendmail, for example, cannot set its uid to be a normal 
 330  * user and then switch back, because if you're root, setuid() sets
 331  * the saved uid too.  If you don't like this, blame the bright people
 332  * in the POSIX commmittee and/or USG.  Note that the BSD-style setreuid()
 333  * will allow a root program to temporarily drop privileges and be able to
 334  * regain them by swapping the real and effective uid.  
 335  */
 336 asmlinkage int sys_setuid(uid_t uid)
     /*  */
 337 {
 338         if (suser())
 339                 current->uid = current->euid = current->suid = uid;
 340         else if ((uid == current->uid) || (uid == current->suid))
 341                 current->euid = uid;
 342         else
 343                 return -EPERM;
 344         return(0);
 345 }
 346 
 347 asmlinkage int sys_times(struct tms * tbuf)
     /*  */
 348 {
 349         if (tbuf) {
 350                 int error = verify_area(VERIFY_WRITE,tbuf,sizeof *tbuf);
 351                 if (error)
 352                         return error;
 353                 put_fs_long(current->utime,(unsigned long *)&tbuf->tms_utime);
 354                 put_fs_long(current->stime,(unsigned long *)&tbuf->tms_stime);
 355                 put_fs_long(current->cutime,(unsigned long *)&tbuf->tms_cutime);
 356                 put_fs_long(current->cstime,(unsigned long *)&tbuf->tms_cstime);
 357         }
 358         return jiffies;
 359 }
 360 
 361 asmlinkage int sys_brk(unsigned long brk)
     /*  */
 362 {
 363         int freepages;
 364         unsigned long rlim;
 365         unsigned long newbrk, oldbrk;
 366 
 367         if (brk < current->mm->end_code)
 368                 return current->mm->brk;
 369         newbrk = PAGE_ALIGN(brk);
 370         oldbrk = PAGE_ALIGN(current->mm->brk);
 371         if (oldbrk == newbrk)
 372                 return current->mm->brk = brk;
 373 
 374         /*
 375          * Always allow shrinking brk
 376          */
 377         if (brk <= current->mm->brk) {
 378                 current->mm->brk = brk;
 379                 do_munmap(newbrk, oldbrk-newbrk);
 380                 return brk;
 381         }
 382         /*
 383          * Check against rlimit and stack..
 384          */
 385         rlim = current->rlim[RLIMIT_DATA].rlim_cur;
 386         if (rlim >= RLIM_INFINITY)
 387                 rlim = ~0;
 388         if (brk - current->mm->end_code > rlim ||
 389             brk >= current->mm->start_stack - 16384)
 390                 return current->mm->brk;
 391         /*
 392          * stupid algorithm to decide if we have enough memory: while
 393          * simple, it hopefully works in most obvious cases.. Easy to
 394          * fool it, but this should catch most mistakes.
 395          */
 396         freepages = buffermem >> 12;
 397         freepages += nr_free_pages;
 398         freepages += nr_swap_pages;
 399         freepages -= (high_memory - 0x100000) >> 16;
 400         freepages -= (newbrk-oldbrk) >> 12;
 401         if (freepages < 0)
 402                 return current->mm->brk;
 403 #if 0
 404         freepages += current->mm->rss;
 405         freepages -= oldbrk >> 12;
 406         if (freepages < 0)
 407                 return current->mm->brk;
 408 #endif
 409         /*
 410          * Ok, we have probably got enough memory - let it rip.
 411          */
 412         current->mm->brk = brk;
 413         do_mmap(NULL, oldbrk, newbrk-oldbrk,
 414                 PROT_READ|PROT_WRITE|PROT_EXEC,
 415                 MAP_FIXED|MAP_PRIVATE, 0);
 416         return brk;
 417 }
 418 
 419 /*
 420  * This needs some heave checking ...
 421  * I just haven't get the stomach for it. I also don't fully
 422  * understand sessions/pgrp etc. Let somebody who does explain it.
 423  *
 424  * OK, I think I have the protection semantics right.... this is really
 425  * only important on a multi-user system anyway, to make sure one user
 426  * can't send a signal to a process owned by another.  -TYT, 12/12/91
 427  *
 428  * Auch. Had to add the 'did_exec' flag to conform completely to POSIX.
 429  * LBT 04.03.94
 430  */
 431 asmlinkage int sys_setpgid(pid_t pid, pid_t pgid)
     /*  */
 432 {
 433         struct task_struct * p;
 434 
 435         if (!pid)
 436                 pid = current->pid;
 437         if (!pgid)
 438                 pgid = pid;
 439         if (pgid < 0)
 440                 return -EINVAL;
 441         for_each_task(p) {
 442                 if (p->pid == pid)
 443                         goto found_task;
 444         }
 445         return -ESRCH;
 446 
 447 found_task:
 448         if (p->p_pptr == current || p->p_opptr == current) {
 449                 if (p->session != current->session)
 450                         return -EPERM;
 451                 if (p->did_exec)
 452                         return -EACCES;
 453         } else if (p != current)
 454                 return -ESRCH;
 455         if (p->leader)
 456                 return -EPERM;
 457         if (pgid != pid) {
 458                 struct task_struct * tmp;
 459                 for_each_task (tmp) {
 460                         if (tmp->pgrp == pgid &&
 461                          tmp->session == current->session)
 462                                 goto ok_pgid;
 463                 }
 464                 return -EPERM;
 465         }
 466 
 467 ok_pgid:
 468         p->pgrp = pgid;
 469         return 0;
 470 }
 471 
 472 asmlinkage int sys_getpgid(pid_t pid)
     /*  */
 473 {
 474         struct task_struct * p;
 475 
 476         if (!pid)
 477                 return current->pgrp;
 478         for_each_task(p) {
 479                 if (p->pid == pid)
 480                         return p->pgrp;
 481         }
 482         return -ESRCH;
 483 }
 484 
 485 asmlinkage int sys_getpgrp(void)
     /*  */
 486 {
 487         return current->pgrp;
 488 }
 489 
 490 asmlinkage int sys_setsid(void)
     /*  */
 491 {
 492         if (current->leader)
 493                 return -EPERM;
 494         current->leader = 1;
 495         current->session = current->pgrp = current->pid;
 496         current->tty = NULL;
 497         return current->pgrp;
 498 }
 499 
 500 /*
 501  * Supplementary group ID's
 502  */
 503 asmlinkage int sys_getgroups(int gidsetsize, gid_t *grouplist)
     /*  */
 504 {
 505         int i;
 506 
 507         if (gidsetsize) {
 508                 i = verify_area(VERIFY_WRITE, grouplist, sizeof(gid_t) * gidsetsize);
 509                 if (i)
 510                         return i;
 511         }
 512         for (i = 0 ; (i < NGROUPS) && (current->groups[i] != NOGROUP) ; i++) {
 513                 if (!gidsetsize)
 514                         continue;
 515                 if (i >= gidsetsize)
 516                         break;
 517                 put_fs_word(current->groups[i], (short *) grouplist);
 518                 grouplist++;
 519         }
 520         return(i);
 521 }
 522 
 523 asmlinkage int sys_setgroups(int gidsetsize, gid_t *grouplist)
     /*  */
 524 {
 525         int     i;
 526 
 527         if (!suser())
 528                 return -EPERM;
 529         if (gidsetsize > NGROUPS)
 530                 return -EINVAL;
 531         for (i = 0; i < gidsetsize; i++, grouplist++) {
 532                 current->groups[i] = get_fs_word((unsigned short *) grouplist);
 533         }
 534         if (i < NGROUPS)
 535                 current->groups[i] = NOGROUP;
 536         return 0;
 537 }
 538 
 539 int in_group_p(gid_t grp)
     /*  */
 540 {
 541         int     i;
 542 
 543         if (grp == current->egid)
 544                 return 1;
 545 
 546         for (i = 0; i < NGROUPS; i++) {
 547                 if (current->groups[i] == NOGROUP)
 548                         break;
 549                 if (current->groups[i] == grp)
 550                         return 1;
 551         }
 552         return 0;
 553 }
 554 
 555 asmlinkage int sys_newuname(struct new_utsname * name)
     /*  */
 556 {
 557         int error;
 558 
 559         if (!name)
 560                 return -EFAULT;
 561         error = verify_area(VERIFY_WRITE, name, sizeof *name);
 562         if (!error)
 563                 memcpy_tofs(name,&system_utsname,sizeof *name);
 564         return error;
 565 }
 566 
 567 asmlinkage int sys_uname(struct old_utsname * name)
     /*  */
 568 {
 569         int error;
 570         if (!name)
 571                 return -EFAULT;
 572         error = verify_area(VERIFY_WRITE, name,sizeof *name);
 573         if (error)
 574                 return error;
 575         memcpy_tofs(&name->sysname,&system_utsname.sysname,
 576                 sizeof (system_utsname.sysname));
 577         memcpy_tofs(&name->nodename,&system_utsname.nodename,
 578                 sizeof (system_utsname.nodename));
 579         memcpy_tofs(&name->release,&system_utsname.release,
 580                 sizeof (system_utsname.release));
 581         memcpy_tofs(&name->version,&system_utsname.version,
 582                 sizeof (system_utsname.version));
 583         memcpy_tofs(&name->machine,&system_utsname.machine,
 584                 sizeof (system_utsname.machine));
 585         return 0;
 586 }
 587 
 588 asmlinkage int sys_olduname(struct oldold_utsname * name)
     /*  */
 589 {
 590         int error;
 591         if (!name)
 592                 return -EFAULT;
 593         error = verify_area(VERIFY_WRITE, name,sizeof *name);
 594         if (error)
 595                 return error;
 596         memcpy_tofs(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
 597         put_fs_byte(0,name->sysname+__OLD_UTS_LEN);
 598         memcpy_tofs(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
 599         put_fs_byte(0,name->nodename+__OLD_UTS_LEN);
 600         memcpy_tofs(&name->release,&system_utsname.release,__OLD_UTS_LEN);
 601         put_fs_byte(0,name->release+__OLD_UTS_LEN);
 602         memcpy_tofs(&name->version,&system_utsname.version,__OLD_UTS_LEN);
 603         put_fs_byte(0,name->version+__OLD_UTS_LEN);
 604         memcpy_tofs(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
 605         put_fs_byte(0,name->machine+__OLD_UTS_LEN);
 606         return 0;
 607 }
 608 
 609 /*
 610  * Only sethostname; gethostname can be implemented by calling uname()
 611  */
 612 asmlinkage int sys_sethostname(char *name, int len)
     /*  */
 613 {
 614         int     i;
 615         
 616         if (!suser())
 617                 return -EPERM;
 618         if (len > __NEW_UTS_LEN)
 619                 return -EINVAL;
 620         for (i=0; i < len; i++) {
 621                 if ((system_utsname.nodename[i] = get_fs_byte(name+i)) == 0)
 622                         return 0;
 623         }
 624         system_utsname.nodename[i] = 0;
 625         return 0;
 626 }
 627 
 628 /*
 629  * Only setdomainname; getdomainname can be implemented by calling
 630  * uname()
 631  */
 632 asmlinkage int sys_setdomainname(char *name, int len)
     /*  */
 633 {
 634         int     i;
 635         
 636         if (!suser())
 637                 return -EPERM;
 638         if (len > __NEW_UTS_LEN)
 639                 return -EINVAL;
 640         for (i=0; i < len; i++) {
 641                 if ((system_utsname.domainname[i] = get_fs_byte(name+i)) == 0)
 642                         return 0;
 643         }
 644         system_utsname.domainname[i] = 0;
 645         return 0;
 646 }
 647 
 648 asmlinkage int sys_getrlimit(unsigned int resource, struct rlimit *rlim)
     /*  */
 649 {
 650         int error;
 651 
 652         if (resource >= RLIM_NLIMITS)
 653                 return -EINVAL;
 654         error = verify_area(VERIFY_WRITE,rlim,sizeof *rlim);
 655         if (error)
 656                 return error;
 657         put_fs_long(current->rlim[resource].rlim_cur, 
 658                     (unsigned long *) rlim);
 659         put_fs_long(current->rlim[resource].rlim_max, 
 660                     ((unsigned long *) rlim)+1);
 661         return 0;       
 662 }
 663 
 664 asmlinkage int sys_setrlimit(unsigned int resource, struct rlimit *rlim)
     /*  */
 665 {
 666         struct rlimit new_rlim, *old_rlim;
 667 
 668         if (resource >= RLIM_NLIMITS)
 669                 return -EINVAL;
 670         old_rlim = current->rlim + resource;
 671         new_rlim.rlim_cur = get_fs_long((unsigned long *) rlim);
 672         new_rlim.rlim_max = get_fs_long(((unsigned long *) rlim)+1);
 673         if (((new_rlim.rlim_cur > old_rlim->rlim_max) ||
 674              (new_rlim.rlim_max > old_rlim->rlim_max)) &&
 675             !suser())
 676                 return -EPERM;
 677         *old_rlim = new_rlim;
 678         return 0;
 679 }
 680 
 681 /*
 682  * It would make sense to put struct rusuage in the task_struct,
 683  * except that would make the task_struct be *really big*.  After
 684  * task_struct gets moved into malloc'ed memory, it would
 685  * make sense to do this.  It will make moving the rest of the information
 686  * a lot simpler!  (Which we're not doing right now because we're not
 687  * measuring them yet).
 688  */
 689 int getrusage(struct task_struct *p, int who, struct rusage *ru)
     /*  */
 690 {
 691         int error;
 692         struct rusage r;
 693         unsigned long   *lp, *lpend, *dest;
 694 
 695         error = verify_area(VERIFY_WRITE, ru, sizeof *ru);
 696         if (error)
 697                 return error;
 698         memset((char *) &r, 0, sizeof(r));
 699         switch (who) {
 700                 case RUSAGE_SELF:
 701                         r.ru_utime.tv_sec = CT_TO_SECS(p->utime);
 702                         r.ru_utime.tv_usec = CT_TO_USECS(p->utime);
 703                         r.ru_stime.tv_sec = CT_TO_SECS(p->stime);
 704                         r.ru_stime.tv_usec = CT_TO_USECS(p->stime);
 705                         r.ru_minflt = p->mm->min_flt;
 706                         r.ru_majflt = p->mm->maj_flt;
 707                         break;
 708                 case RUSAGE_CHILDREN:
 709                         r.ru_utime.tv_sec = CT_TO_SECS(p->cutime);
 710                         r.ru_utime.tv_usec = CT_TO_USECS(p->cutime);
 711                         r.ru_stime.tv_sec = CT_TO_SECS(p->cstime);
 712                         r.ru_stime.tv_usec = CT_TO_USECS(p->cstime);
 713                         r.ru_minflt = p->mm->cmin_flt;
 714                         r.ru_majflt = p->mm->cmaj_flt;
 715                         break;
 716                 default:
 717                         r.ru_utime.tv_sec = CT_TO_SECS(p->utime + p->cutime);
 718                         r.ru_utime.tv_usec = CT_TO_USECS(p->utime + p->cutime);
 719                         r.ru_stime.tv_sec = CT_TO_SECS(p->stime + p->cstime);
 720                         r.ru_stime.tv_usec = CT_TO_USECS(p->stime + p->cstime);
 721                         r.ru_minflt = p->mm->min_flt + p->mm->cmin_flt;
 722                         r.ru_majflt = p->mm->maj_flt + p->mm->cmaj_flt;
 723                         break;
 724         }
 725         lp = (unsigned long *) &r;
 726         lpend = (unsigned long *) (&r+1);
 727         dest = (unsigned long *) ru;
 728         for (; lp < lpend; lp++, dest++) 
 729                 put_fs_long(*lp, dest);
 730         return 0;
 731 }
 732 
 733 asmlinkage int sys_getrusage(int who, struct rusage *ru)
     /*  */
 734 {
 735         if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN)
 736                 return -EINVAL;
 737         return getrusage(current, who, ru);
 738 }
 739 
 740 asmlinkage int sys_umask(int mask)
     /*  */
 741 {
 742         int old = current->fs->umask;
 743 
 744         current->fs->umask = mask & S_IRWXUGO;
 745         return (old);
 746 }

/* */