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utimes.2 (2010 09)

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utimes(2) utimes(2)
NAME
utimes - set file access and modification times
SYNOPSIS
#include <sys/time.h>
int utimes(const char *path, const struct timeval times[2]);
DESCRIPTION
The utimes() function sets the access and modification times of the file pointed to by the path argu-
ment to the value of the times argument. The
utimes() function allows time specifications accurate to
the microsecond.
For
utimes(), the times argument is an array of
timeval structures. The first array member
represents the date and time of last access, and the second member represents the date and time of last
modification. The times in the
timeval
structure are measured in seconds and microseconds since the
Epoch, although rounding toward the nearest second may occur.
If the times argument is a null pointer, the access and modification times of the file are set to the current
time. The effective user ID of the process must be the same as the owner of the file, or must have write
access to the file or appropriate privileges to use this call in this manner. Upon completion,
utimes()
will mark the time of the last file status change, st_ctime , for update.
RETURN VALUE
Upon successful completion, 0 is returned. Otherwise, −1 is returned and
errno is set to indicate the
error, and the file times will not be affected.
ERRORS
The utimes() function will fail if:
[EACCES] Search permission is denied by a component of the path prefix; or the times
argument is a null pointer and the effective user ID of the process does not
match the owner of the file and write access is denied.
[ELOOP] Too many symbolic links were encountered in resolving path.
[ENAMETOOLONG] The length of the path argument exceeds
{PATH_MAX} or a pathname
component is longer than
{NAME_MAX}.
[ENOENT] A component of path does not name an existing file or path is an empty
string.
[ENOTDIR] A component of the path prefix is not a directory.
[EPERM] The times argument is not a null pointer and the calling process’ effective
user ID has write access to the file but does not match the owner of the file
and the calling process does not have the appropriate privileges.
[EROFS] The file system containing the file is read-only.
The
utimes() function may fail if:
[ENAMETOOLONG] Pathname resolution of a symbolic link produced an intermediate result
whose length exceeds
{PATH_MAX}.
SEE ALSO
<sys/time.h>.
CHANGE HISTORY
First released in Issue 4, Version 2.
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

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