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pumnflqv2 2 years ago
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commit fa738282c8

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