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utime(2) - utime, utimes, utime, utimes - change access and/or modification times of an inode - man 2 utime

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UTIME(2)                   Linux Programmer's Manual                  UTIME(2)



NAME
       utime, utimes - change access(2,5) and/or modification times of an inode

SYNOPSIS
       #include <sys/types.h>
       #include <utime.h>

       int utime(const char *filename, const struct utimbuf *buf);


       #include <sys/time.h>

       int utimes(const char *filename, const struct timeval tv[2]);

DESCRIPTION
       utime  changes the access(2,5) and modification times of the inode specified
       by filename to the actime and modtime fields of buf respectively.

       If buf is NULL, then the access(2,5) and modification times of the file(1,n)  are
       set(7,n,1 builtins) to the current time.

       Changing  time(1,2,n)  stamps is permitted when: either the process has appro-
       priate privileges (Linux: has the CAP_FOWNER capability), or the effec-
       tive  user  ID  equals the user ID of the file(1,n), or buf must is NULL and
       the process has write(1,2) permission to the file.

       The utimbuf structure is:

              struct utimbuf {
                      time_t actime;  /* access(2,5) time(1,2,n) */
                      time_t modtime; /* modification time(1,2,n) */
              };

       The function utime allows specification of time(1,2,n) stamps with  a  resolu-
       tion of 1 second.  The function utimes is similar, but allows a resolu-
       tion of 1 microsecond.  Here tv[0] refers to access(2,5) time(1,2,n), and tv[1]  to
       modification time.

       The timeval structure is:

              struct timeval {
                      long    tv_sec;         /* seconds */
                      long    tv_usec;        /* microseconds */
              };

RETURN VALUE
       On  success,  zero is returned.  On error(8,n), -1 is returned, and errno is
       set(7,n,1 builtins) appropriately.

ERRORS
       EACCES Search permission is denied for one of the  directories  in(1,8)  the
              path  prefix  of  path  (see also path_resolution(2)), or buf is
              NULL and the process does not have permission to change the time(1,2,n)
              stamps (see above).

       ENOENT filename does not exist.

       EPERM  buf  is  not  NULL  and  the process does not have permission to
              change the time(1,2,n) stamps.

       EROFS  path resides on a read-only file(1,n) system.

NOTES
       Linux does not allow changing the time(1,2,n) stamps on an immutable file(1,n),  or
       setting  the time(1,2,n) stamps to something other than the current time(1,2,n) on an
       append-only file.

       In libc4 and libc5, utimes is just a wrapper for utime and  hence  does
       not allow a subsecond resolution.

       POSIX calls utimes legacy.

BUGS
       Linux  is not careful to distinguish between the EACCES and EPERM error(8,n)
       returns.  On the other hand, POSIX 1003.1-2003 is buggy  in(1,8)  its  error(8,n)
       description for utimes.

CONFORMING TO
       utime:  SVr4,  SVID, POSIX.  SVr4 documents additional error(8,n) conditions
       EFAULT, EINTR, ELOOP, EMULTIHOP, ENAMETOOLONG, ENOLINK, ENOLINK,  ENOT-
       DIR.
       utimes: BSD 4.3

SEE ALSO
       chattr(1), stat(1,2)(2)



Linux 2.6.8                       2004-10-10                          UTIME(2)

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