- introduce new call numbers, names, and field aliases; - initialize request messages to zero for all ABI calls; - format callnr.h in the same way as com.h; - redo call tables in both servers; - remove param.h namespace pollution in the servers; - make brk(2) go to VM directly, rather than through PM; - remove obsolete BRK, UTIME, and WAIT calls; - clean up path copying routine in VFS; - move remaining system calls from libminlib to libc; - correct some errno-related mistakes in libc routines. Change-Id: I2d8ec5d061cd7e0b30c51ffd77aa72ebf84e2565
155 lines
4.6 KiB
C
155 lines
4.6 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_utimens: perform the UTIMENS 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 <time.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "file.h"
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#include "path.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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#define UTIMENS_STYLE 0 /* utimes(2)/utimensat(2) style, named file */
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#define FUTIMENS_STYLE 1 /* futimens(2)/futimes(2) style, file desc. */
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/*===========================================================================*
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* do_utimens *
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*===========================================================================*/
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int do_utimens(void)
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{
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/* Perform the utimens(name, times, flag) system call, and its friends.
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* Implement a very large but not complete subset of the utimensat()
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* Posix:2008/XOpen-7 function.
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* Are handled all the following cases:
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* . utimensat(AT_FDCWD, "/some/absolute/path", , )
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* . utimensat(AT_FDCWD, "some/path", , )
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* . utimens("anything", ) really special case of the above two
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* . lutimens("anything", ) also really special case of the above
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* . utimensat(fd, "/some/absolute/path", , ) although fd is useless here
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* . futimens(fd, )
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* Are not handled the following cases:
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* . utimensat(fd, "some/path", , ) path to a file relative to some open fd
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*/
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int r, kind, lookup_flags;
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struct vnode *vp;
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struct filp *filp = NULL; /* initialization required by clueless GCC */
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struct vmnt *vmp;
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struct timespec actim, modtim, now, newactim, newmodtim;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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vir_bytes vname;
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size_t vname_length;
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memset(&now, 0, sizeof(now));
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/* The case times==NULL is handled by the caller, replaced with UTIME_NOW */
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actim.tv_sec = job_m_in.VFS_UTIMENS_ATIME;
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actim.tv_nsec = job_m_in.VFS_UTIMENS_ANSEC;
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modtim.tv_sec = job_m_in.VFS_UTIMENS_MTIME;
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modtim.tv_nsec = job_m_in.VFS_UTIMENS_MNSEC;
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if (job_m_in.VFS_UTIMENS_NAME != NULL) {
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kind = UTIMENS_STYLE;
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if (job_m_in.VFS_UTIMENS_FLAGS & ~AT_SYMLINK_NOFOLLOW)
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return EINVAL; /* unknown flag */
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/* Temporarily open the file */
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vname = (vir_bytes) job_m_in.VFS_UTIMENS_NAME;
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vname_length = (size_t) job_m_in.VFS_UTIMENS_LEN;
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if (job_m_in.VFS_UTIMENS_FLAGS & AT_SYMLINK_NOFOLLOW)
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lookup_flags = PATH_RET_SYMLINK;
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else
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lookup_flags = PATH_NOFLAGS;
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lookup_init(&resolve, fullpath, lookup_flags, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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/* Temporarily open the file */
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if (fetch_name(vname, vname_length, fullpath) != OK) return(err_code);
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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}
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else {
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kind = FUTIMENS_STYLE;
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/* Change timestamps on already-opened fd. Is it valid? */
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if (job_m_in.VFS_UTIMENS_FLAGS != 0)
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return EINVAL; /* unknown flag */
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if ((filp = get_filp(job_m_in.VFS_UTIMENS_FD, VNODE_READ)) == NULL)
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return err_code;
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vp = filp->filp_vno;
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}
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r = OK;
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/* Only the owner of a file or the super user can change timestamps. */
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if (vp->v_uid != fp->fp_effuid && fp->fp_effuid != SU_UID) r = EPERM;
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/* Need write permission (or super user) to 'touch' the file */
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if (r != OK && actim.tv_nsec == UTIME_NOW
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&& modtim.tv_nsec == UTIME_NOW) r = forbidden(fp, 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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/* Do we need to ask for current time? */
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if (actim.tv_nsec == UTIME_NOW
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|| actim.tv_nsec == UTIME_OMIT
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|| modtim.tv_nsec == UTIME_NOW
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|| modtim.tv_nsec == UTIME_OMIT) {
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now = clock_timespec();
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}
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/* Build the request */
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switch (actim.tv_nsec) {
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case UTIME_NOW:
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newactim = now;
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break;
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case UTIME_OMIT:
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newactim.tv_nsec = UTIME_OMIT;
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/* Be nice with old FS, put a sensible value in
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* otherwise not used field for seconds
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*/
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newactim.tv_sec = now.tv_sec;
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break;
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default:
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if ( (unsigned)actim.tv_nsec >= 1000000000)
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r = EINVAL;
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else
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newactim = actim;
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break;
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}
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switch (modtim.tv_nsec) {
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case UTIME_NOW:
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newmodtim = now;
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break;
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case UTIME_OMIT:
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newmodtim.tv_nsec = UTIME_OMIT;
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/* Be nice with old FS, put a sensible value */
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newmodtim.tv_sec = now.tv_sec;
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break;
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default:
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if ( (unsigned)modtim.tv_nsec >= 1000000000)
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r = EINVAL;
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else
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newmodtim = modtim;
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break;
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}
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}
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if (r == OK)
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/* Issue request */
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r = req_utime(vp->v_fs_e, vp->v_inode_nr, &newactim, &newmodtim);
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if (kind == UTIMENS_STYLE) {
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/* Close the temporary */
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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}
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else { /* Change timestamps on opened fd. */
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unlock_filp(filp);
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}
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return r;
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}
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