67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/* This file takes care of those system calls that deal with time.
|
|
*
|
|
* The entry points into this file are
|
|
* do_utime: perform the UTIME system call
|
|
* do_stime: PM informs FS about STIME system call
|
|
*/
|
|
|
|
#include "fs.h"
|
|
#include <minix/callnr.h>
|
|
#include <minix/com.h>
|
|
#include "file.h"
|
|
#include "fproc.h"
|
|
#include "inode.h"
|
|
#include "param.h"
|
|
|
|
/*===========================================================================*
|
|
* do_utime *
|
|
*===========================================================================*/
|
|
PUBLIC int do_utime()
|
|
{
|
|
/* Perform the utime(name, timep) system call. */
|
|
|
|
register struct inode *rip;
|
|
register int len, r;
|
|
|
|
/* Adjust for case of 'timep' being NULL;
|
|
* utime_strlen then holds the actual size: strlen(name)+1.
|
|
*/
|
|
len = m_in.utime_length;
|
|
if (len == 0) len = m_in.utime_strlen;
|
|
|
|
/* Temporarily open the file. */
|
|
if (fetch_name(m_in.utime_file, len, M1) != OK) return(err_code);
|
|
if ( (rip = eat_path(user_path)) == NIL_INODE) return(err_code);
|
|
|
|
/* Only the owner of a file or the super_user can change its time. */
|
|
r = OK;
|
|
if (rip->i_uid != fp->fp_effuid && !super_user) r = EPERM;
|
|
if (m_in.utime_length == 0 && r != OK) r = forbidden(rip, W_BIT);
|
|
if (read_only(rip) != OK) r = EROFS; /* not even su can touch if R/O */
|
|
if (r == OK) {
|
|
if (m_in.utime_length == 0) {
|
|
rip->i_atime = clock_time();
|
|
rip->i_mtime = rip->i_atime;
|
|
} else {
|
|
rip->i_atime = m_in.utime_actime;
|
|
rip->i_mtime = m_in.utime_modtime;
|
|
}
|
|
rip->i_update = CTIME; /* discard any stale ATIME and MTIME flags */
|
|
rip->i_dirt = DIRTY;
|
|
}
|
|
|
|
put_inode(rip);
|
|
return(r);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_stime *
|
|
*===========================================================================*/
|
|
PUBLIC int do_stime()
|
|
{
|
|
/* Perform the stime(tp) system call. */
|
|
boottime = (long) m_in.pm_stime;
|
|
return(OK);
|
|
}
|
|
|