utimes(2)

NAME

utimes − set file access and modification times

SYNOPSIS

#include <sys/time.h>

int utimes(const char ∗path, const struct timeval times);

DESCRIPTION

The utimes() function sets the access and modification times of the file pointed to by the path argument 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 super-user 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 VALUES

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.

EFAULT path or times 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 times 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 resolving 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 PATH_MAX or a pathname component is longer than NAME_MAX.

ENOLINK path points to a remote machine and the link to that machine is no longer active.

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
Path name resolution of a symbolic link produced an intermediate result whose length exceeds PATH_MAX.

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