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371 lines
6.2 KiB
371 lines
6.2 KiB
/*
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* linux/kernel/sys.c
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*
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* (C) 1991 Linus Torvalds
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*/
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#include <errno.h>
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#include <linux/sched.h>
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#include <linux/tty.h>
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#include <linux/kernel.h>
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#include <asm/segment.h>
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#include <sys/times.h>
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#include <sys/utsname.h>
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int sys_ftime()
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{
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return -ENOSYS;
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}
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int sys_break()
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{
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return -ENOSYS;
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}
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int sys_ptrace()
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{
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return -ENOSYS;
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}
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int sys_stty()
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{
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return -ENOSYS;
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}
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int sys_gtty()
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{
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return -ENOSYS;
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}
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int sys_rename()
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{
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return -ENOSYS;
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}
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int sys_prof()
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{
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return -ENOSYS;
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}
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int sys_setregid(int rgid, int egid)
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{
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if (rgid>0) {
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if ((current->gid == rgid) ||
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suser())
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current->gid = rgid;
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else
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return(-EPERM);
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}
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if (egid>0) {
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if ((current->gid == egid) ||
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(current->egid == egid) ||
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suser()) {
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current->egid = egid;
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current->sgid = egid;
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} else
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return(-EPERM);
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}
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return 0;
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}
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int sys_setgid(int gid)
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{
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/* return(sys_setregid(gid, gid)); */
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if (suser())
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current->gid = current->egid = current->sgid = gid;
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else if ((gid == current->gid) || (gid == current->sgid))
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current->egid = gid;
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else
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return -EPERM;
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return 0;
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}
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int sys_acct()
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{
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return -ENOSYS;
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}
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int sys_phys()
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{
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return -ENOSYS;
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}
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int sys_lock()
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{
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return -ENOSYS;
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}
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int sys_mpx()
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{
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return -ENOSYS;
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}
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int sys_ulimit()
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{
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return -ENOSYS;
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}
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int sys_time(long * tloc)
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{
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int i;
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i = CURRENT_TIME;
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if (tloc) {
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verify_area(tloc,4);
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put_fs_long(i,(unsigned long *)tloc);
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}
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return i;
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}
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/*
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* Unprivileged users may change the real user id to the effective uid
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* or vice versa.
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*/
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int sys_setreuid(int ruid, int euid)
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{
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int old_ruid = current->uid;
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if (ruid>0) {
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if ((current->euid==ruid) ||
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(old_ruid == ruid) ||
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suser())
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current->uid = ruid;
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else
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return(-EPERM);
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}
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if (euid>0) {
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if ((old_ruid == euid) ||
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(current->euid == euid) ||
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suser()) {
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current->euid = euid;
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current->suid = euid;
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} else {
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current->uid = old_ruid;
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return(-EPERM);
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}
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}
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return 0;
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}
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int sys_setuid(int uid)
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{
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/* return(sys_setreuid(uid, uid)); */
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if (suser())
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current->uid = current->euid = current->suid = uid;
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else if ((uid == current->uid) || (uid == current->suid))
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current->euid = uid;
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else
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return -EPERM;
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return(0);
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}
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int sys_stime(long * tptr)
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{
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if (!suser())
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return -EPERM;
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startup_time = get_fs_long((unsigned long *)tptr) - jiffies/HZ;
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return 0;
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}
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int sys_times(struct tms * tbuf)
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{
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if (tbuf) {
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verify_area(tbuf,sizeof *tbuf);
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put_fs_long(current->utime,(unsigned long *)&tbuf->tms_utime);
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put_fs_long(current->stime,(unsigned long *)&tbuf->tms_stime);
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put_fs_long(current->cutime,(unsigned long *)&tbuf->tms_cutime);
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put_fs_long(current->cstime,(unsigned long *)&tbuf->tms_cstime);
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}
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return jiffies;
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}
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int sys_brk(unsigned long end_data_seg)
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{
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if (end_data_seg >= current->end_code &&
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end_data_seg < current->start_stack - 16384)
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current->brk = end_data_seg;
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return current->brk;
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}
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/*
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* This needs some heave checking ...
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* I just haven't get the stomach for it. I also don't fully
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* understand sessions/pgrp etc. Let somebody who does explain it.
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*/
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int sys_setpgid(int pid, int pgid)
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{
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int i;
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if (!pid)
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pid = current->pid;
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if (!pgid)
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pgid = current->pid;
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for (i=0 ; i<NR_TASKS ; i++)
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if (task[i] && task[i]->pid==pid) {
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if (task[i]->leader)
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return -EPERM;
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if (task[i]->session != current->session)
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return -EPERM;
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task[i]->pgrp = pgid;
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return 0;
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}
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return -ESRCH;
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}
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int sys_getpgrp(void)
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{
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return current->pgrp;
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}
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int sys_setsid(void)
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{
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if (current->leader && !suser())
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return -EPERM;
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current->leader = 1;
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current->session = current->pgrp = current->pid;
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current->tty = -1;
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return current->pgrp;
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}
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int sys_getgroups()
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{
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return -ENOSYS;
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}
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int sys_setgroups()
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{
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return -ENOSYS;
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}
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int sys_uname(struct utsname * name)
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{
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static struct utsname thisname = {
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"linux .0","nodename","release ","version ","machine "
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};
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int i;
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if (!name) return -ERROR;
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verify_area(name,sizeof *name);
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for(i=0;i<sizeof *name;i++)
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put_fs_byte(((char *) &thisname)[i],i+(char *) name);
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return 0;
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}
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int sys_sethostname()
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{
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return -ENOSYS;
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}
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int sys_getrlimit()
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{
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return -ENOSYS;
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}
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int sys_setrlimit()
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{
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return -ENOSYS;
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}
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int sys_getrusage()
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{
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return -ENOSYS;
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}
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int sys_gettimeofday()
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{
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return -ENOSYS;
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}
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int sys_settimeofday()
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{
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return -ENOSYS;
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}
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int sys_umask(int mask)
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{
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int old = current->umask;
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current->umask = mask & 0777;
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return (old);
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}
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int sys_sleep(unsigned int count)
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{
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int a=jiffies;
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sys_signal(SIGALRM,SIG_IGN);
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sys_alarm(count);
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sys_pause();
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if((jiffies-a)/100==count)return 0;
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else return -1;
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}
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int sys_getdents(unsigned int fd,struct linux_dirent *dirp,unsigned int count)
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{
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struct buffer_head *bh;
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struct m_inode*inode=current->filp[fd]->f_inode;
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struct linux_dirent m;
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struct dir_entry *dir;
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char *buf;
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int k,n=0,i;
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if(count<=0)return -1;
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bh=bread(inode->i_dev,inode->i_zone[0]);
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for(k=0;k<inode->i_size;k+=sizeof(struct linux_dirent))
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{
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if(n+sizeof(struct linux_dirent)>count)return 0;
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dir=(struct dir_entry*)(bh->b_data+k);
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if(dir->inode)
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{
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m.d_ino=dir->inode;
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for(i=0;i<NAME_LEN;i++)m.d_name[i]=dir->name[i];
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m.d_off=0;
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m.d_reclen=sizeof(struct linux_dirent);
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buf=&m;
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for(i=0;i<m.d_reclen;i++)
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put_fs_byte(*(buf+i),(char*)(dirp)+n+i);
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n+=sizeof(struct linux_dirent);
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}
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else continue;
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}
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brelse(bh);
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return n;
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}
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long sys_getcwd(char*buf,size_t size)
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{
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struct buffer_head *bh;
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struct m_inode*n_inode,*f_inode;
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struct dir_entry*dir;
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char *tmp,*b;
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int k,i;
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tmp=(char*)malloc(256);
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b=(char*)malloc(256);
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n_inode=current->pwd;
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if(n_inode==current->root)strcpy(tmp,"/");
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bh=bread(n_inode->i_dev,n_inode->i_zone[0]);
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while(n_inode!=current->root)
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{
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dir=(struct dir_entry*)(bh->b_data+sizeof(struct dir_entry));
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f_inode=iget(n_inode->i_dev,dir->inode);
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brelse(bh);
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bh=bread(f_inode->i_dev,f_inode->i_zone[0]);
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k=0;
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while(k<f_inode->i_size)
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{
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dir=(struct dir_entry*)(bh->b_data+k);
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if(dir->inode==n_inode->i_num)break;
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k+=sizeof(struct dir_entry);
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}
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strcpy(b,"/");
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strcat(b,dir->name);
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strcat(b,tmp);
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strcpy(tmp,b);
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n_inode=f_inode;
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}
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brelse(bh);
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if(strlen(tmp)>size)return NULL;
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for(i=0;i<256;i++)
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put_fs_byte(tmp[i],buf+i);
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return (long)buf;
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}
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int sys_getpipe2()
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{
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return 0;
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} |