utime(2)
NAME
utime − set file times
SYNTAX
#include <sys/types.h>
int utime (path, times)
char *path;
struct utimbuf *times;
DESCRIPTION
The path points to a path name naming a file. The utime system call 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 and the access and modification times are set to the values contained in the designated structure. Only the owner of the file or the superuser may use utime this way.
The function utime will also cause the time of the last file status change(st_ctime) to be updated with the current time.
The times in the following structure are measured in seconds since 00:00:00 GMT, Jan. 1, 1970.
structutimbuf{
time_tactime;/* access time */
time_tmodtime;/* modification time */
};
RETURN VALUE
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error.
DIAGNOSTICS
The utime system call will fail if one or more of the following are true:
[ENOENT] The named file does not exist.
[ENOTDIR] A component of the path prefix is not a directory.
[EACCES] Search permission is denied by a component of the path prefix.
[EPERM] The effective user ID is not superuser and not the owner of the file and times is not NULL.
[EACCES] The effective user ID is not superuser and not the owner of the file and times is NULL and write access is denied.
[EROFS] The file system containing the file is mounted read-only.
[EFAULT] The times is not NULL and points outside the process’s allocated address space.
[EFAULT] The path points outside the process’s allocated address space.
[ETIMEDOUT] A "connect" request or remote file operation failed because the connected party did not properly respond after a period of time which is dependent on the communications protocol.