UTIMES(2) BSD System Calls Manual UTIMES(2)NAME
utimes, futimes — set file access and modification times
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/time.h>
int
utimes(const char *path, const struct timeval *times);
int
futimes(int fd, const struct timeval *times);
DESCRIPTION
The access and modification times of the file named by path or referenced
by fd are changed as specified by the argument times.
If times is NULL, the access and modification times are set to the cur‐
rent time. The caller must be the owner of the file, have permission to
write the file, or be the super-user.
If times is non-NULL, it is assumed to point to an array of two timeval
structures. The access time is set to the value of the first element,
and the modification time is set to the value of the second element. The
caller must be the owner of the file or be the super-user.
In either case, the inode-change-time of the file is set to the current
time.
RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the
value -1 is returned and the global variable errno is set to indicate the
error.
ERRORSutimes() will fail if:
[EACCES] Search permission is denied for a component of the
path prefix; or the times argument is NULL and the
effective user ID of the process does not match the
owner of the file, and is not the super-user, and
write access is denied.
[EFAULT] path or times points outside the process's allocated
address space.
[EIO] An I/O error occurred while reading or writing the
affected inode.
[ELOOP] Too many symbolic links were encountered in translat‐
ing the pathname.
[ENAMETOOLONG] A component of a pathname exceeded NAME_MAX charac‐
ters, or an entire path name exceeded PATH_MAX charac‐
ters.
[ENOENT] The named file does not exist.
[ENOTDIR] A component of the path prefix is not a directory.
[EPERM] The times argument is not NULL and the calling
process's effective user ID does not match the owner
of the file and is not the super-user.
[EROFS] The file system containing the file is mounted read-
only.
futimes() will fail if:
[EBADF] fd does not refer to a valid descriptor.
All of the functions will fail if:
[EACCES] The times argument is NULL and the effective user ID
of the process does not match the owner of the file,
and is not the super-user, and write access is denied.
[EFAULT] times points outside the process's allocated address
space.
[EIO] An I/O error occurred while reading or writing the
affected inode.
[EPERM] The times argument is not NULL and the calling
process's effective user ID does not match the owner
of the file and is not the super-user.
[EROFS] The file system containing the file is mounted read-
only.
SEE ALSOstat(2), utime(3)HISTORY
The utimes() function call appeared in 4.2BSD. The futimes() function
call first appeared in FreeBSD 3.0.
BSD June 4, 1993 BSD
