112 lines
3 KiB
C
112 lines
3 KiB
C
/* This file takes care of those system calls that deal with time.
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*
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* The entry points into this file are
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* do_utime: perform the UTIME system call
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* do_time: perform the TIME system call
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* do_stime: perform the STIME system call
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* do_tims: perform the TIMES system call
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*/
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#include "fs.h"
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include "file.h"
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#include "fproc.h"
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#include "inode.h"
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#include "param.h"
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/*===========================================================================*
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* do_utime *
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*===========================================================================*/
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PUBLIC int do_utime()
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{
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/* Perform the utime(name, timep) system call. */
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register struct inode *rip;
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register int len, r;
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/* Adjust for case of 'timep' being NULL;
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* utime_strlen then holds the actual size: strlen(name)+1.
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*/
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len = m_in.utime_length;
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if (len == 0) len = m_in.utime_strlen;
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/* Temporarily open the file. */
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if (fetch_name(m_in.utime_file, len, M1) != OK) return(err_code);
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if ( (rip = eat_path(user_path)) == NIL_INODE) return(err_code);
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/* Only the owner of a file or the super_user can change its time. */
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r = OK;
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if (rip->i_uid != fp->fp_effuid && !super_user) r = EPERM;
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if (m_in.utime_length == 0 && r != OK) r = forbidden(rip, W_BIT);
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if (read_only(rip) != OK) r = EROFS; /* not even su can touch if R/O */
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if (r == OK) {
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if (m_in.utime_length == 0) {
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rip->i_atime = clock_time();
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rip->i_mtime = rip->i_atime;
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} else {
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rip->i_atime = m_in.utime_actime;
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rip->i_mtime = m_in.utime_modtime;
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}
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rip->i_update = CTIME; /* discard any stale ATIME and MTIME flags */
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rip->i_dirt = DIRTY;
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}
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put_inode(rip);
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return(r);
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}
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/*===========================================================================*
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* do_time *
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*===========================================================================*/
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PUBLIC int do_time()
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{
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/* Perform the time(tp) system call. */
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m_out.reply_l1 = clock_time(); /* return time in seconds */
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return(OK);
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}
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/*===========================================================================*
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* do_stime *
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*===========================================================================*/
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PUBLIC int do_stime()
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{
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/* Perform the stime(tp) system call. Retrieve the system's uptime (ticks
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* since boot) and store the time in seconds at system boot in the global
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* variable 'boottime'.
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*/
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register int k;
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clock_t uptime;
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if (!super_user) return(EPERM);
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if ( (k=sys_getuptime(&uptime)) != OK) panic("do_stime error", k);
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boottime = (long) m_in.tp - (uptime/HZ);
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return(OK);
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}
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/*===========================================================================*
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* do_tims *
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*===========================================================================*/
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PUBLIC int do_tims()
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{
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/* Perform the times(buffer) system call. */
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clock_t t[5];
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sys_times(who, t);
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m_out.reply_t1 = t[0];
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m_out.reply_t2 = t[1];
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m_out.reply_t3 = t[2];
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m_out.reply_t4 = t[3];
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m_out.reply_t5 = t[4];
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return(OK);
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}
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