utimes(2)

NAME

utimes − set file times

SYNOPSIS

#include <sys/types.h>
#include <sys/time.h>

int utimes(char ∗file, struct timeval ∗tvp);

DESCRIPTION

utimes() sets the access and modification times of the file named by file.

If tvp is NULL, the access and modification times are set to the current time. A process must be the owner of the file or have write permission for the file to use utimes() in this manner.

If tvp is not NULL, it is assumed to point to an array of two timeval structures. The access time is set to the value of the first member, and the modification time is set to the value of the second member. Only the owner of the file or the super-user may use utimes() in this manner.

In either case, the inode-changed time of the file is set to the current time.

utimes() also causes the time of the last file status change (st_ctime) to be updated.

RETURN VALUES

utimes() returns:

0 on success.

−1 on failure and sets errno to indicate the error.

ERRORS

utimes() will fail if one or more of the following are true:

EACCES Search permission is denied for a component of the path prefix of file.

EACCES The effective user ID of the process is not super-user and not the owner of the file, write permission is denied for the file, and tvp is NULL.

EFAULT file or tvp points to an illegal address.

EINTR A signal was caught during the utimes() function.

EINVAL The number of microseconds specified in one or both of the timeval structures pointed to by tvp was greater than or equal to 1,000,000 or less than 0.

EIO An I/O error occurred while reading from or writing to the file system.

ELOOP Too many symbolic links were encountered in translating file.

EMULTIHOP Components of file require hopping to multiple remote machines and the file system does not allow it.

ENAMETOOLONG The length of the file argument exceeds {PATH_MAX}, or the length of a path component of file exceeds {NAME_MAX} while {_POSIX_NO_TRUNC} is in effect.

ENOENT The named file does not exist or is a null pathname.

ENOLINK file points to a remote machine and the link to that machine is no longer active.

ENOTDIR A component of the path prefix of file is not a directory.

EPERM The effective user of the calling process is not super-user and not the owner of the file, and tvp is not NULL.

EROFS The file system containing the file is mounted read-only.

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