minix/servers/fs/time.c
2005-08-22 15:23:47 +00:00

66 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);
}