utime(2) utime(2)
NAME
utime - set file access and modification times
SYNOPSIS
#include <sys/types.h>
#include <utime.h>
int utime(const char *path, const struct utimbuf *times);
DESCRIPTION
path points to a path name naming a file. utime sets the access and
modification times of the named file.
If times is NULL, the access and modification times of the file are
set to the current time. A process must be the owner of the file or
have write permission to use utime in this manner.
If times is not NULL, times is interpreted as a pointer to a utimbuf
structure (defined in utime.h) and the access and modification times
are set to the values contained in the designated structure. Only
the owner of the file or the super-user may use utime this way.
The times in the following structure are measured in seconds since
00:00:00 UTC, Jan. 1, 1970.
struct utimbuf {
timet actime; /* access time */
timet modtime;/* modification time */
};
utime also causes the time of the last file status change (stctime)
to be updated.
utime will fail if one or more of the following are true:
EACCES Search permission is denied by a component of the
path prefix.
EACCES The effective user ID is not super-user and not
the owner of the file and times is NULL and write
access is denied.
EFAULT times is not NULL and points outside the
process's allocated address space.
EFAULT path points outside the process's allocated
address space.
EINTR A signal was caught during the utime system call.
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utime(2) utime(2)
ELOOP Too many symbolic links were encountered in
translating path.
EMULTIHOP Components of path require hopping to multiple
remote machines and the file system does not
allow it.
ENAMETOOLONG The length of the path argument exceeds
{PATHMAX}, or the length of a path component
exceeds {NAMEMAX} while POSIXNOTRUNC is in
effect.
ENOENT The named file does not exist or is a null
pathname.
ENOLINK path points to a remote machine and the link to
that machine is no longer active.
ENOTDIR A component of the path prefix is not a
directory.
EPERM The effective user ID is not super-user and not
the owner of the file and times is not NULL.
EROFS The file system containing the file is mounted
read-only.
SEE ALSO
stat(2).
DIAGNOSTICS
Upon successful completion, a value of 0 is returned. Otherwise, a
value of -1 is returned and errno is set to indicate the error.
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