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. 

structutimbuf{
time_tactime;/∗ access time ∗/
time_tmodtime;/∗ modification time ∗/
};

utime also causes the time of the last file status change (st_ctime) 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. 

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 {PATH_MAX}, or the length of a path component exceeds {NAME_MAX} while _POSIX_NO_TRUNC 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ENOLINK path points to a remote machine and the link to that machine is no longer active.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.