13ef7f1f38
file descriptor passing, PFS does some back calls to VFS. For example, to verify the validity of a path provided by a process and to tell VFS it must copy file descriptors from one process to another.
57 lines
1.6 KiB
C
57 lines
1.6 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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*/
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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 "param.h"
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#include "vnode.h"
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#include <minix/vfsif.h>
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#include "vmnt.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 int len;
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int r;
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time_t actime, modtime;
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struct vnode *vp;
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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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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 ((vp = eat_path(PATH_NOFLAGS, fp)) == NULL) return(err_code);
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/* Only the owner of a file or the super user can change its name. */
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r = OK;
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if (vp->v_uid != fp->fp_effuid && fp->fp_effuid != SU_UID) r = EPERM;
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if (m_in.utime_length == 0 && r != OK) r = forbidden(vp, W_BIT);
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if (read_only(vp) != OK) r = EROFS; /* Not even su can touch if R/O */
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if (r == OK) {
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/* Issue request */
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if(m_in.utime_length == 0) {
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actime = modtime = clock_time();
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} else {
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actime = m_in.utime_actime;
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modtime = m_in.utime_modtime;
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}
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r = req_utime(vp->v_fs_e, vp->v_inode_nr, actime, modtime);
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}
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put_vnode(vp);
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return(r);
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}
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