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1.1.1.2 root 1: /*
2: * linux/kernel/sys.c
3: *
1.1.1.9 root 4: * Copyright (C) 1991, 1992 Linus Torvalds
1.1.1.2 root 5: */
6:
1.1.1.9 root 7: #include <linux/errno.h>
1.1 root 8: #include <linux/sched.h>
9: #include <linux/tty.h>
10: #include <linux/kernel.h>
1.1.1.3 root 11: #include <linux/config.h>
1.1.1.9 root 12: #include <linux/times.h>
1.1.1.7 root 13: #include <linux/utsname.h>
1.1.1.9 root 14: #include <linux/param.h>
15: #include <linux/resource.h>
1.1.1.10! root 16: #include <linux/signal.h>
1.1.1.6 root 17: #include <linux/string.h>
1.1.1.10! root 18: #include <linux/ptrace.h>
1.1.1.3 root 19:
1.1.1.9 root 20: #include <asm/segment.h>
21:
1.1.1.4 root 22: /*
1.1.1.10! root 23: * this indicates wether you can reboot with ctrl-alt-del: the default is yes
1.1.1.4 root 24: */
25: static int C_A_D = 1;
26:
1.1.1.3 root 27: /*
28: * The timezone where the local system is located. Used as a default by some
29: * programs who obtain this value by using gettimeofday.
30: */
31: struct timezone sys_tz = { 0, 0};
32:
33: extern int session_of_pgrp(int pgrp);
1.1 root 34:
1.1.1.6 root 35: #define PZERO 15
36:
37: static int proc_sel(struct task_struct *p, int which, int who)
38: {
39: switch (which) {
40: case PRIO_PROCESS:
41: if (!who && p == current)
42: return 1;
43: return(p->pid == who);
44: case PRIO_PGRP:
45: if (!who)
46: who = current->pgrp;
47: return(p->pgrp == who);
48: case PRIO_USER:
49: if (!who)
50: who = current->uid;
51: return(p->uid == who);
52: }
53: return 0;
54: }
55:
56: int sys_setpriority(int which, int who, int niceval)
57: {
58: struct task_struct **p;
59: int error = ESRCH;
60: int priority;
61:
62: if (which > 2 || which < 0)
63: return -EINVAL;
64:
65: if ((priority = PZERO - niceval) <= 0)
66: priority = 1;
67:
68: for(p = &LAST_TASK; p > &FIRST_TASK; --p) {
69: if (!*p || !proc_sel(*p, which, who))
70: continue;
71: if ((*p)->uid != current->euid &&
72: (*p)->uid != current->uid && !suser()) {
73: error = EPERM;
74: continue;
75: }
76: if (error == ESRCH)
77: error = 0;
78: if (priority > (*p)->priority && !suser())
79: error = EACCES;
80: else
81: (*p)->priority = priority;
82: }
83: return -error;
84: }
85:
86: int sys_getpriority(int which, int who)
87: {
88: struct task_struct **p;
89: int max_prio = 0;
90:
91: if (which > 2 || which < 0)
92: return -EINVAL;
93:
94: for(p = &LAST_TASK; p > &FIRST_TASK; --p) {
95: if (!*p || !proc_sel(*p, which, who))
96: continue;
97: if ((*p)->priority > max_prio)
98: max_prio = (*p)->priority;
99: }
100: return(max_prio ? max_prio : -ESRCH);
101: }
102:
103: int sys_profil()
104: {
105: return -ENOSYS;
106: }
107:
1.1 root 108: int sys_ftime()
109: {
110: return -ENOSYS;
111: }
112:
113: int sys_break()
114: {
115: return -ENOSYS;
116: }
117:
1.1.1.4 root 118: int sys_stty()
1.1 root 119: {
120: return -ENOSYS;
121: }
122:
1.1.1.4 root 123: int sys_gtty()
1.1 root 124: {
125: return -ENOSYS;
126: }
127:
1.1.1.4 root 128: int sys_prof()
1.1 root 129: {
130: return -ENOSYS;
131: }
132:
1.1.1.10! root 133: unsigned long save_v86_state(int signr,struct vm86_regs * regs)
! 134: {
! 135: unsigned long stack;
! 136:
! 137: if (!current->vm86_info) {
! 138: printk("no vm86_info: BAD\n");
! 139: do_exit(SIGSEGV);
! 140: }
! 141: memcpy_tofs(&(current->vm86_info->regs),regs,sizeof(*regs));
! 142: put_fs_long(current->screen_bitmap,&(current->vm86_info->screen_bitmap));
! 143: stack = current->tss.esp0;
! 144: current->tss.esp0 = current->saved_kernel_stack;
! 145: current->saved_kernel_stack = 0;
! 146: return stack;
! 147: }
! 148:
! 149: static void mark_screen_rdonly(struct task_struct * tsk)
! 150: {
! 151: unsigned long tmp;
! 152: unsigned long *pg_table;
! 153:
! 154: if (tmp = tsk->tss.cr3) {
! 155: tmp = *(unsigned long *) tmp;
! 156: if (tmp & PAGE_PRESENT) {
! 157: tmp &= 0xfffff000;
! 158: pg_table = (0xA0000 >> PAGE_SHIFT) + (unsigned long *) tmp;
! 159: tmp = 32;
! 160: while (tmp--) {
! 161: if (PAGE_PRESENT & *pg_table)
! 162: *pg_table &= ~PAGE_RW;
! 163: pg_table++;
! 164: }
! 165: }
! 166: }
! 167: }
! 168:
! 169: int sys_vm86(struct vm86_struct * v86)
! 170: {
! 171: struct vm86_struct info;
! 172: struct pt_regs * pt_regs = (struct pt_regs *) &v86;
! 173:
! 174: if (current->saved_kernel_stack)
! 175: return -EPERM;
! 176: memcpy_fromfs(&info,v86,sizeof(info));
! 177: /*
! 178: * make sure the vm86() system call doesn't try to do anything silly
! 179: */
! 180: info.regs.__null_ds = 0;
! 181: info.regs.__null_es = 0;
! 182: info.regs.__null_fs = 0;
! 183: info.regs.__null_gs = 0;
! 184: /*
! 185: * The eflags register is also special: we cannot trust that the user
! 186: * has set it up safely, so this makes sure interrupt etc flags are
! 187: * inherited from protected mode.
! 188: */
! 189: info.regs.eflags &= 0x00000dd5;
! 190: info.regs.eflags |= 0xfffff22a & pt_regs->eflags;
! 191: info.regs.eflags |= VM_MASK;
! 192: current->saved_kernel_stack = current->tss.esp0;
! 193: current->tss.esp0 = (unsigned long) pt_regs;
! 194: current->vm86_info = v86;
! 195: current->screen_bitmap = info.screen_bitmap;
! 196: if (info.flags & VM86_SCREEN_BITMAP)
! 197: mark_screen_rdonly(current);
! 198: __asm__ __volatile__("movl %0,%%esp\n\t"
! 199: "pushl $ret_from_sys_call\n\t"
! 200: "ret"::"g" ((long) &(info.regs)),"a" (info.regs.eax));
! 201: return 0;
! 202: }
! 203:
1.1.1.4 root 204: extern void hard_reset_now(void);
205:
206: /*
207: * Reboot system call: for obvious reasons only root may call it,
208: * and even root needs to set up some magic numbers in the registers
209: * so that some mistake won't make this reboot the whole machine.
210: * You can also set the meaning of the ctrl-alt-del-key here.
211: *
212: * reboot doesn't sync: do that yourself before calling this.
213: */
214: int sys_reboot(int magic, int magic_too, int flag)
1.1 root 215: {
1.1.1.4 root 216: if (!suser())
217: return -EPERM;
218: if (magic != 0xfee1dead || magic_too != 672274793)
219: return -EINVAL;
220: if (flag == 0x01234567)
221: hard_reset_now();
222: else if (flag == 0x89ABCDEF)
223: C_A_D = 1;
224: else if (!flag)
225: C_A_D = 0;
226: else
227: return -EINVAL;
228: return (0);
1.1 root 229: }
230:
1.1.1.4 root 231: /*
232: * This function gets called by ctrl-alt-del - ie the keyboard interrupt.
233: * As it's called within an interrupt, it may NOT sync: the only choice
234: * is wether to reboot at once, or just ignore the ctrl-alt-del.
235: */
236: void ctrl_alt_del(void)
1.1 root 237: {
1.1.1.4 root 238: if (C_A_D)
239: hard_reset_now();
1.1.1.8 root 240: else
1.1.1.9 root 241: send_sig(SIGINT,task[1],1);
1.1 root 242: }
1.1.1.4 root 243:
1.1 root 244:
1.1.1.3 root 245: /*
246: * This is done BSD-style, with no consideration of the saved gid, except
247: * that if you set the effective gid, it sets the saved gid too. This
248: * makes it possible for a setgid program to completely drop its privileges,
249: * which is often a useful assertion to make when you are doing a security
250: * audit over a program.
251: *
252: * The general idea is that a program which uses just setregid() will be
253: * 100% compatible with BSD. A program which uses just setgid() will be
254: * 100% compatible with POSIX w/ Saved ID's.
255: */
1.1.1.2 root 256: int sys_setregid(int rgid, int egid)
1.1 root 257: {
1.1.1.7 root 258: if (rgid >= 0) {
1.1.1.2 root 259: if ((current->gid == rgid) ||
260: suser())
261: current->gid = rgid;
262: else
263: return(-EPERM);
264: }
1.1.1.7 root 265: if (egid >= 0) {
1.1.1.2 root 266: if ((current->gid == egid) ||
267: (current->egid == egid) ||
1.1.1.3 root 268: suser()) {
1.1.1.2 root 269: current->egid = egid;
1.1.1.3 root 270: current->sgid = egid;
271: } else
1.1.1.2 root 272: return(-EPERM);
273: }
1.1 root 274: return 0;
275: }
276:
1.1.1.3 root 277: /*
278: * setgid() is implemeneted like SysV w/ SAVED_IDS
279: */
1.1.1.2 root 280: int sys_setgid(int gid)
281: {
1.1.1.3 root 282: if (suser())
283: current->gid = current->egid = current->sgid = gid;
284: else if ((gid == current->gid) || (gid == current->sgid))
285: current->egid = gid;
286: else
287: return -EPERM;
288: return 0;
1.1.1.2 root 289: }
290:
1.1 root 291: int sys_acct()
292: {
293: return -ENOSYS;
294: }
295:
296: int sys_phys()
297: {
298: return -ENOSYS;
299: }
300:
301: int sys_lock()
302: {
303: return -ENOSYS;
304: }
305:
306: int sys_mpx()
307: {
308: return -ENOSYS;
309: }
310:
311: int sys_ulimit()
312: {
313: return -ENOSYS;
314: }
315:
316: int sys_time(long * tloc)
317: {
318: int i;
319:
320: i = CURRENT_TIME;
321: if (tloc) {
322: verify_area(tloc,4);
323: put_fs_long(i,(unsigned long *)tloc);
324: }
325: return i;
326: }
327:
1.1.1.2 root 328: /*
329: * Unprivileged users may change the real user id to the effective uid
1.1.1.3 root 330: * or vice versa. (BSD-style)
331: *
332: * When you set the effective uid, it sets the saved uid too. This
333: * makes it possible for a setuid program to completely drop its privileges,
334: * which is often a useful assertion to make when you are doing a security
335: * audit over a program.
336: *
337: * The general idea is that a program which uses just setreuid() will be
338: * 100% compatible with BSD. A program which uses just setuid() will be
339: * 100% compatible with POSIX w/ Saved ID's.
1.1.1.2 root 340: */
341: int sys_setreuid(int ruid, int euid)
1.1 root 342: {
1.1.1.2 root 343: int old_ruid = current->uid;
344:
1.1.1.7 root 345: if (ruid >= 0) {
1.1.1.2 root 346: if ((current->euid==ruid) ||
1.1.1.7 root 347: (old_ruid == ruid) ||
1.1.1.2 root 348: suser())
349: current->uid = ruid;
1.1 root 350: else
1.1.1.2 root 351: return(-EPERM);
352: }
1.1.1.7 root 353: if (euid >= 0) {
1.1.1.2 root 354: if ((old_ruid == euid) ||
1.1.1.7 root 355: (current->euid == euid) ||
1.1.1.3 root 356: suser()) {
1.1.1.2 root 357: current->euid = euid;
1.1.1.3 root 358: current->suid = euid;
359: } else {
1.1.1.2 root 360: current->uid = old_ruid;
361: return(-EPERM);
362: }
363: }
1.1 root 364: return 0;
365: }
366:
1.1.1.3 root 367: /*
368: * setuid() is implemeneted like SysV w/ SAVED_IDS
369: *
370: * Note that SAVED_ID's is deficient in that a setuid root program
371: * like sendmail, for example, cannot set its uid to be a normal
372: * user and then switch back, because if you're root, setuid() sets
373: * the saved uid too. If you don't like this, blame the bright people
374: * in the POSIX commmittee and/or USG. Note that the BSD-style setreuid()
375: * will allow a root program to temporarily drop privileges and be able to
376: * regain them by swapping the real and effective uid.
377: */
1.1.1.2 root 378: int sys_setuid(int uid)
379: {
1.1.1.3 root 380: if (suser())
381: current->uid = current->euid = current->suid = uid;
382: else if ((uid == current->uid) || (uid == current->suid))
383: current->euid = uid;
384: else
385: return -EPERM;
386: return(0);
1.1.1.2 root 387: }
388:
1.1 root 389: int sys_stime(long * tptr)
390: {
1.1.1.2 root 391: if (!suser())
392: return -EPERM;
1.1 root 393: startup_time = get_fs_long((unsigned long *)tptr) - jiffies/HZ;
1.1.1.3 root 394: jiffies_offset = 0;
1.1 root 395: return 0;
396: }
397:
398: int sys_times(struct tms * tbuf)
399: {
1.1.1.2 root 400: if (tbuf) {
401: verify_area(tbuf,sizeof *tbuf);
402: put_fs_long(current->utime,(unsigned long *)&tbuf->tms_utime);
403: put_fs_long(current->stime,(unsigned long *)&tbuf->tms_stime);
404: put_fs_long(current->cutime,(unsigned long *)&tbuf->tms_cutime);
405: put_fs_long(current->cstime,(unsigned long *)&tbuf->tms_cstime);
406: }
1.1 root 407: return jiffies;
408: }
409:
410: int sys_brk(unsigned long end_data_seg)
411: {
412: if (end_data_seg >= current->end_code &&
413: end_data_seg < current->start_stack - 16384)
414: current->brk = end_data_seg;
415: return current->brk;
416: }
417:
418: /*
419: * This needs some heave checking ...
420: * I just haven't get the stomach for it. I also don't fully
421: * understand sessions/pgrp etc. Let somebody who does explain it.
1.1.1.3 root 422: *
423: * OK, I think I have the protection semantics right.... this is really
424: * only important on a multi-user system anyway, to make sure one user
425: * can't send a signal to a process owned by another. -TYT, 12/12/91
1.1 root 426: */
427: int sys_setpgid(int pid, int pgid)
428: {
1.1.1.3 root 429: int i;
1.1 root 430:
431: if (!pid)
432: pid = current->pid;
433: if (!pgid)
1.1.1.2 root 434: pgid = current->pid;
1.1.1.3 root 435: if (pgid < 0)
436: return -EINVAL;
1.1 root 437: for (i=0 ; i<NR_TASKS ; i++)
1.1.1.3 root 438: if (task[i] && (task[i]->pid == pid) &&
439: ((task[i]->p_pptr == current) ||
440: (task[i] == current))) {
1.1 root 441: if (task[i]->leader)
442: return -EPERM;
1.1.1.3 root 443: if ((task[i]->session != current->session) ||
444: ((pgid != pid) &&
445: (session_of_pgrp(pgid) != current->session)))
1.1 root 446: return -EPERM;
447: task[i]->pgrp = pgid;
448: return 0;
449: }
450: return -ESRCH;
451: }
452:
453: int sys_getpgrp(void)
454: {
455: return current->pgrp;
456: }
457:
458: int sys_setsid(void)
459: {
1.1.1.2 root 460: if (current->leader && !suser())
1.1 root 461: return -EPERM;
462: current->leader = 1;
463: current->session = current->pgrp = current->pid;
464: current->tty = -1;
465: return current->pgrp;
466: }
467:
1.1.1.3 root 468: /*
469: * Supplementary group ID's
470: */
471: int sys_getgroups(int gidsetsize, gid_t *grouplist)
472: {
473: int i;
474:
475: if (gidsetsize)
476: verify_area(grouplist, sizeof(gid_t) * gidsetsize);
477:
478: for (i = 0; (i < NGROUPS) && (current->groups[i] != NOGROUP);
479: i++, grouplist++) {
480: if (gidsetsize) {
481: if (i >= gidsetsize)
482: return -EINVAL;
483: put_fs_word(current->groups[i], (short *) grouplist);
484: }
485: }
486: return(i);
487: }
488:
489: int sys_setgroups(int gidsetsize, gid_t *grouplist)
490: {
491: int i;
492:
493: if (!suser())
494: return -EPERM;
495: if (gidsetsize > NGROUPS)
496: return -EINVAL;
497: for (i = 0; i < gidsetsize; i++, grouplist++) {
498: current->groups[i] = get_fs_word((unsigned short *) grouplist);
499: }
500: if (i < NGROUPS)
501: current->groups[i] = NOGROUP;
502: return 0;
503: }
504:
505: int in_group_p(gid_t grp)
506: {
507: int i;
508:
509: if (grp == current->egid)
510: return 1;
511:
512: for (i = 0; i < NGROUPS; i++) {
513: if (current->groups[i] == NOGROUP)
514: break;
515: if (current->groups[i] == grp)
516: return 1;
517: }
518: return 0;
519: }
520:
1.1.1.7 root 521: int sys_newuname(struct new_utsname * name)
1.1 root 522: {
1.1.1.7 root 523: if (!name)
524: return -EFAULT;
525: verify_area(name, sizeof *name);
1.1.1.10! root 526: memcpy_tofs(name,&system_utsname,sizeof *name);
1.1.1.7 root 527: return 0;
528: }
1.1 root 529:
1.1.1.7 root 530: int sys_uname(struct old_utsname * name)
531: {
1.1.1.6 root 532: if (!name)
533: return -EINVAL;
1.1 root 534: verify_area(name,sizeof *name);
1.1.1.10! root 535: memcpy_tofs(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
1.1.1.7 root 536: put_fs_byte(0,name->sysname+__OLD_UTS_LEN);
1.1.1.10! root 537: memcpy_tofs(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
1.1.1.7 root 538: put_fs_byte(0,name->nodename+__OLD_UTS_LEN);
1.1.1.10! root 539: memcpy_tofs(&name->release,&system_utsname.release,__OLD_UTS_LEN);
1.1.1.7 root 540: put_fs_byte(0,name->release+__OLD_UTS_LEN);
1.1.1.10! root 541: memcpy_tofs(&name->version,&system_utsname.version,__OLD_UTS_LEN);
1.1.1.7 root 542: put_fs_byte(0,name->version+__OLD_UTS_LEN);
1.1.1.10! root 543: memcpy_tofs(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
1.1.1.7 root 544: put_fs_byte(0,name->machine+__OLD_UTS_LEN);
1.1.1.2 root 545: return 0;
1.1 root 546: }
547:
1.1.1.3 root 548: /*
549: * Only sethostname; gethostname can be implemented by calling uname()
550: */
551: int sys_sethostname(char *name, int len)
552: {
553: int i;
554:
555: if (!suser())
556: return -EPERM;
1.1.1.7 root 557: if (len > __NEW_UTS_LEN)
1.1.1.3 root 558: return -EINVAL;
559: for (i=0; i < len; i++) {
1.1.1.10! root 560: if ((system_utsname.nodename[i] = get_fs_byte(name+i)) == 0)
1.1.1.7 root 561: return 0;
1.1.1.3 root 562: }
1.1.1.10! root 563: system_utsname.nodename[i] = 0;
1.1.1.3 root 564: return 0;
565: }
566:
567: int sys_getrlimit(int resource, struct rlimit *rlim)
568: {
569: if (resource >= RLIM_NLIMITS)
570: return -EINVAL;
571: verify_area(rlim,sizeof *rlim);
572: put_fs_long(current->rlim[resource].rlim_cur,
573: (unsigned long *) rlim);
574: put_fs_long(current->rlim[resource].rlim_max,
575: ((unsigned long *) rlim)+1);
576: return 0;
577: }
578:
579: int sys_setrlimit(int resource, struct rlimit *rlim)
580: {
581: struct rlimit new, *old;
582:
583: if (resource >= RLIM_NLIMITS)
584: return -EINVAL;
585: old = current->rlim + resource;
586: new.rlim_cur = get_fs_long((unsigned long *) rlim);
587: new.rlim_max = get_fs_long(((unsigned long *) rlim)+1);
588: if (((new.rlim_cur > old->rlim_max) ||
589: (new.rlim_max > old->rlim_max)) &&
590: !suser())
591: return -EPERM;
592: *old = new;
593: return 0;
594: }
595:
596: /*
597: * It would make sense to put struct rusuage in the task_struct,
598: * except that would make the task_struct be *really big*. After
599: * task_struct gets moved into malloc'ed memory, it would
600: * make sense to do this. It will make moving the rest of the information
601: * a lot simpler! (Which we're not doing right now because we're not
602: * measuring them yet).
603: */
1.1.1.10! root 604: void getrusage(struct task_struct *p, int who, struct rusage *ru)
1.1.1.3 root 605: {
606: struct rusage r;
607: unsigned long *lp, *lpend, *dest;
608:
609: verify_area(ru, sizeof *ru);
610: memset((char *) &r, 0, sizeof(r));
1.1.1.10! root 611: switch (who) {
! 612: case RUSAGE_SELF:
! 613: r.ru_utime.tv_sec = CT_TO_SECS(p->utime);
! 614: r.ru_utime.tv_usec = CT_TO_USECS(p->utime);
! 615: r.ru_stime.tv_sec = CT_TO_SECS(p->stime);
! 616: r.ru_stime.tv_usec = CT_TO_USECS(p->stime);
! 617: r.ru_minflt = p->min_flt;
! 618: r.ru_majflt = p->maj_flt;
! 619: break;
! 620: case RUSAGE_CHILDREN:
! 621: r.ru_utime.tv_sec = CT_TO_SECS(p->cutime);
! 622: r.ru_utime.tv_usec = CT_TO_USECS(p->cutime);
! 623: r.ru_stime.tv_sec = CT_TO_SECS(p->cstime);
! 624: r.ru_stime.tv_usec = CT_TO_USECS(p->cstime);
! 625: r.ru_minflt = p->cmin_flt;
! 626: r.ru_majflt = p->cmaj_flt;
! 627: break;
! 628: default:
! 629: r.ru_utime.tv_sec = CT_TO_SECS(p->utime + p->cutime);
! 630: r.ru_utime.tv_usec = CT_TO_USECS(p->utime + p->cutime);
! 631: r.ru_stime.tv_sec = CT_TO_SECS(p->stime + p->cstime);
! 632: r.ru_stime.tv_usec = CT_TO_USECS(p->stime + p->cstime);
! 633: r.ru_minflt = p->min_flt + p->cmin_flt;
! 634: r.ru_majflt = p->maj_flt + p->cmaj_flt;
! 635: break;
1.1.1.3 root 636: }
637: lp = (unsigned long *) &r;
638: lpend = (unsigned long *) (&r+1);
639: dest = (unsigned long *) ru;
640: for (; lp < lpend; lp++, dest++)
641: put_fs_long(*lp, dest);
1.1.1.10! root 642: }
! 643:
! 644: int sys_getrusage(int who, struct rusage *ru)
! 645: {
! 646: if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN)
! 647: return -EINVAL;
! 648: getrusage(current, who, ru);
1.1.1.3 root 649: return(0);
650: }
651:
652: int sys_gettimeofday(struct timeval *tv, struct timezone *tz)
653: {
654: if (tv) {
655: verify_area(tv, sizeof *tv);
656: put_fs_long(startup_time + CT_TO_SECS(jiffies+jiffies_offset),
657: (unsigned long *) tv);
658: put_fs_long(CT_TO_USECS(jiffies+jiffies_offset),
659: ((unsigned long *) tv)+1);
660: }
661: if (tz) {
662: verify_area(tz, sizeof *tz);
663: put_fs_long(sys_tz.tz_minuteswest, (unsigned long *) tz);
664: put_fs_long(sys_tz.tz_dsttime, ((unsigned long *) tz)+1);
665: }
666: return 0;
667: }
668:
669: /*
670: * The first time we set the timezone, we will warp the clock so that
671: * it is ticking GMT time instead of local time. Presumably,
672: * if someone is setting the timezone then we are running in an
673: * environment where the programs understand about timezones.
674: * This should be done at boot time in the /etc/rc script, as
675: * soon as possible, so that the clock can be set right. Otherwise,
676: * various programs will get confused when the clock gets warped.
677: */
678: int sys_settimeofday(struct timeval *tv, struct timezone *tz)
679: {
680: static int firsttime = 1;
681: void adjust_clock();
682:
683: if (!suser())
684: return -EPERM;
685: if (tz) {
686: sys_tz.tz_minuteswest = get_fs_long((unsigned long *) tz);
687: sys_tz.tz_dsttime = get_fs_long(((unsigned long *) tz)+1);
688: if (firsttime) {
689: firsttime = 0;
690: if (!tv)
691: adjust_clock();
692: }
693: }
694: if (tv) {
695: int sec, usec;
696:
697: sec = get_fs_long((unsigned long *)tv);
698: usec = get_fs_long(((unsigned long *)tv)+1);
699:
700: startup_time = sec - jiffies/HZ;
701: jiffies_offset = usec * HZ / 1000000 - jiffies%HZ;
702: }
703: return 0;
704: }
705:
706: /*
707: * Adjust the time obtained from the CMOS to be GMT time instead of
708: * local time.
709: *
710: * This is ugly, but preferable to the alternatives. Otherwise we
711: * would either need to write a program to do it in /etc/rc (and risk
712: * confusion if the program gets run more than once; it would also be
713: * hard to make the program warp the clock precisely n hours) or
714: * compile in the timezone information into the kernel. Bad, bad....
715: *
716: * XXX Currently does not adjust for daylight savings time. May not
717: * need to do anything, depending on how smart (dumb?) the BIOS
718: * is. Blast it all.... the best thing to do not depend on the CMOS
719: * clock at all, but get the time via NTP or timed if you're on a
720: * network.... - TYT, 1/1/92
721: */
722: void adjust_clock()
723: {
724: startup_time += sys_tz.tz_minuteswest*60;
725: }
726:
1.1 root 727: int sys_umask(int mask)
728: {
729: int old = current->umask;
730:
731: current->umask = mask & 0777;
732: return (old);
733: }
1.1.1.3 root 734:
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