utimes(2)
- NetBSD Manual Pages
UTIMES(2) NetBSD System Calls Manual UTIMES(2)
NAME
utimes, lutimes, futimes -- set file access and modification times
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/time.h>
int
utimes(const char *path, const struct timeval times[2]);
int
lutimes(const char *path, const struct timeval times[2]);
int
futimes(int fd, const struct timeval times[2]);
DESCRIPTION
The access and modification times of the file named by path or referenced
by fd are changed as specified by the argument times.
If times is NULL, the access and modification times are set to the cur-
rent time. The caller must be the owner of the file, have permission to
write the file, or be the super-user.
If times is non-NULL, it is assumed to point to an array of two timeval
structures. The access time is set to the value of the first element,
and the modification time is set to the value of the second element. For
file systems that support file birth (creation) times (such as UFS2), the
birth time will be set to the value of the second element if the second
element is older than the currently set birth time. To set both a birth
time and a modification time, two calls are required; the first to set
the birth time and the second to set the (presumably newer) modification
time. Ideally a new system call will be added that allows the setting of
all three times at once. The caller must be the owner of the file or be
the super-user.
In either case, the inode-change-time of the file is set to the current
time.
lutimes() is like utimes() except in the case where the named file is a
symbolic link, in which case lutimes() changes the access and modifica-
tion times of the link, while utimes() changes the times of the file the
link references.
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value
of -1 is returned and errno is set to indicate the error.
ERRORS
utimes() and lutimes() will fail if:
[EACCES] Search permission is denied for a component of the
path prefix; or the times argument is NULL and the
effective user ID of the process does not match the
owner of the file, and is not the super-user, and
write access is denied.
[EFAULT] path or times points outside the process's allocated
address space.
[EIO] An I/O error occurred while reading or writing the
affected inode.
[ELOOP] Too many symbolic links were encountered in translat-
ing the pathname.
[ENAMETOOLONG] A component of a pathname exceeded {NAME_MAX} charac-
ters, or an entire path name exceeded {PATH_MAX} char-
acters.
[ENOENT] The named file does not exist.
[ENOTDIR] A component of the path prefix is not a directory.
[EPERM] The times argument is not NULL and the calling
process's effective user ID does not match the owner
of the file and is not the super-user.
[EROFS] The file system containing the file is mounted read-
only.
futimes() will fail if:
[EBADF] fd does not refer to a valid descriptor.
[EACCES] The times argument is NULL and the effective user ID
of the process does not match the owner of the file,
and is not the super-user, and write access is denied.
[EFAULT] times points outside the process's allocated address
space.
[EIO] An I/O error occurred while reading or writing the
affected inode.
[EPERM] The times argument is not NULL and the calling
process's effective user ID does not match the owner
of the file and is not the super-user.
[EROFS] The file system containing the file is mounted read-
only.
SEE ALSO
stat(2), utime(3), symlink(7)
HISTORY
The utimes() function call appeared in 4.2BSD. The futimes() function
call appeared in NetBSD 1.2. The lutimes() function call appeared in
NetBSD 1.3. Birthtime setting support was added in NetBSD 5.0.
NetBSD 5.0 June 17, 2008 NetBSD 5.0
Powered by man-cgi (2024-03-20).
Maintained for NetBSD
by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.