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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);

MT-Level

Async-Signal-Safe

Description

utime() sets the access and modification times of the file pointed to by path.

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 utimbuf structure contains the following members: 


    time_t    actime;    /* access time */
    time_t    modtime;    /* modification time */

The times in the members of the utimbuf structure are measured in seconds since 00:00:00 UTC, Jan. 1, 1970.

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

Return Values

Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error.

Errors

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 of the process is not super-user and not the owner of the file, write permission is denied for the file, and times is NULL .
EFAULT
path points to an illegal address.
EINTR
A signal was caught during the utime() function.
EIO
An I/O error occurred while reading from or writing to the file system.
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path points to a remote machine and the link to that machine is no longer active.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 of the calling process 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)

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