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440 lines
6.9 KiB
440 lines
6.9 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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#include <signal.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <a.out.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <a.out.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#define MAX_ARG_PAGES 32
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#define SIGALRM 14
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#define BUF_MAX 4096
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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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struct linux_dirent {
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long d_ino;
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off_t d_off;
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unsigned short d_reclen;
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char d_name[14];
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};
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int sys_getdents(unsigned int fd, struct linux_dirent *dirent,unsigned int count)
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{
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struct file * files;
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struct m_inode * f_inode;
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struct linux_dirent dirent1;
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struct buffer_head * block;
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char* buf;
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int counter;
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struct dir_entry *ptr;
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int num=0;
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int t=0;
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files=current->filp[fd];
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if(fd>=NR_OPEN)
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return -EINVAL;
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if(!count) return -1;
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f_inode=files->f_inode;
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block=bread(f_inode->i_dev,f_inode->i_zone[0]);
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for(t=0;t<f_inode->i_size;t+=sizeof(struct dir_entry))
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{
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if (num>=count-sizeof(struct linux_dirent))//限制循环，防止越界
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return 0;
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ptr=(struct dir_entry *)(block->b_data+t);
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if(!ptr->inode) continue;
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dirent1.d_ino=ptr->inode;
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int i=0;
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for(i=0;i<14;i++) dirent1.d_name[i]=ptr->name[i];
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dirent1.d_off=0;
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dirent1.d_reclen=sizeof(dirent1);
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buf=&dirent1;
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for(i=0;i<dirent1.d_reclen;i++)
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{
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put_fs_byte(*(buf+i),((char*)dirent)+i+num);
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}
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num+=dirent1.d_reclen;
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}
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return num;
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}
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int sys_pipe2(unsigned long * fildes)
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{
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struct m_inode * inode;
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struct file * f[2];
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int fd[2];
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int i,j;
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j=0;
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for(i=0;j<2 && i<NR_FILE;i++)
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if (!file_table[i].f_count)
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(f[j++]=i+file_table)->f_count++;
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if (j==1)
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f[0]->f_count=0;
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if (j<2)
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return -1;
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j=0;
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for(i=0;j<2 && i<NR_OPEN;i++)
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if (!current->filp[i]) {
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current->filp[ fd[j]=i ] = f[j];
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j++;
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}
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if (j==1)
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current->filp[fd[0]]=NULL;
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if (j<2) {
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f[0]->f_count=f[1]->f_count=0;
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return -1;
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}
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if (!(inode=get_pipe_inode())) {
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current->filp[fd[0]] =
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current->filp[fd[1]] = NULL;
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f[0]->f_count = f[1]->f_count = 0;
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return -1;
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}
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f[0]->f_inode = f[1]->f_inode = inode;
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f[0]->f_pos = f[1]->f_pos = 0;
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f[0]->f_mode = 1; /* read */
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f[1]->f_mode = 2; /* write */
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put_fs_long(fd[0],0+fildes);
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put_fs_long(fd[1],1+fildes);
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return 0;
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}
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unsigned int sys_sleep(unsigned int second)
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{
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sys_signal(SIGALRM,SIG_IGN,NULL);
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sys_alarm(second);
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sys_pause();
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return 0;
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}
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int sys_mmap(void *start, size_t len, int prot, int flags,
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int fd, off_t off)
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{
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return -ENOSYS;
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}
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int sys_munmap(void * start, size_t len)
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{
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return -ENOSYS;
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}
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int sys_clone(int (*fn)(void *), void *child_stack, int flags, void *arg)
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{
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return -ENOSYS;
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} |