servers/vfs/time.c

   1 /* This file takes care of those system calls that deal with time.
   2  *
   3  * The entry points into this file are
   4  *   do_utime:          perform the UTIME system call
   5  *   do_stime:          PM informs FS about STIME system call
   6  */
   7
   8 #include "fs.h"
   9 #include <minix/callnr.h>
  10 #include <minix/com.h>
  11 #include "file.h"
  12 #include "fproc.h"
  13 #include "param.h"
  14
  15 #include <minix/vfsif.h>
  16 #include "vmnt.h"
  17
  18 /*===========================================================================*
  19  *                              do_utime                                     *
  20  *===========================================================================*/
  21 PUBLIC int do_utime()
  22 {
  23 /* Perform the utime(name, timep) system call. */
  24   register int len;
  25   struct utime_req req;
  26   struct lookup_req lookup_req;
  27   struct node_details res;
  28   int r;
  29
  30   /* Adjust for case of 'timep' being NULL;
  31    * utime_strlen then holds the actual size: strlen(name)+1.
  32    */
  33   len = m_in.utime_length;
  34   if (len == 0) len = m_in.utime_strlen;
  35
  36   if (fetch_name(m_in.utime_file, len, M1) != OK) return(err_code);
  37
  38   /* Fill in lookup request fields */
  39   lookup_req.path = user_fullpath;
  40   lookup_req.lastc = NULL;
  41   lookup_req.flags = EAT_PATH;
  42
  43   /* Request lookup */
  44   if ((r = lookup(&lookup_req, &res)) != OK) return r;
  45
  46   /* Fill in request fields.*/
  47   if (m_in.utime_length == 0) {
  48         req.actime = 0;
  49         req.modtime = clock_time();
  50   } else {
  51         req.actime = m_in.utime_actime;
  52         req.modtime = m_in.utime_modtime;
  53   }
  54   req.fs_e = res.fs_e;
  55   req.inode_nr = res.inode_nr;
  56   req.uid = fp->fp_effuid;
  57   req.gid = fp->fp_effgid;
  58
  59   /* Issue request */
  60   return req_utime(&req);
  61 }
  62
  63
  64 /*===========================================================================*
  65  *                              do_stime                                     *
  66  *===========================================================================*/
  67 PUBLIC int do_stime()
  68 {
  69   struct vmnt *vmp;
  70   /* Perform the stime(tp) system call. */
  71   boottime = (long) m_in.pm_stime;
  72
  73   /* Send new time for all FS processes */
  74   for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; ++vmp) {
  75       if (vmp->m_fs_e) req_stime(vmp->m_fs_e, boottime);
  76   }
  77
  78   return OK;
  79 }
  80