1.\" Copyright (c) 1980, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)utime.3 6.3 (Berkeley) 4/19/91 33.\" 34.Dd August 13, 1993 35.Dt UTIME 3 36.Os BSD 4 37.Sh NAME 38.Nm utime 39.Nd set file times 40.Sh SYNOPSIS 41.Fd #include <sys/types.h> 42.Fd #include <utime.h> 43.Ft int 44.Fn utime "const char *file" "const struct utimbuf *timep" 45.Sh DESCRIPTION 46The 47.Fn utime 48function sets the access and modification times of the named file. 49.Pp 50If 51.Fa timep 52is 53.Dv NULL , 54the access and modification times are set to the current time. 55The calling process must be the owner of the file or have permission to 56write the file. 57.Pp 58If 59.Fa timep 60is 61.Pf non- Dv NULL , 62.Fa time 63is assumed to be a pointer to a utimbuf structure, as defined in 64.Aq Pa utime.h : 65.Bd -literal -offset indent 66struct utimbuf { 67 time_t actime; /* Access time */ 68 time_t modtime; /* Modification time */ 69} ; 70.Ed 71.Pp 72The access time is set to the value of the actime member, and the modification 73time is set to the value of the modtime member. The times are measured in 74seconds since 0 hours, 0 minutes, 0 seconds, January 1, 1970, Coordinated 75Universal Time. 76The calling process must be the owner of the file or be the super-user. 77.Pp 78In either case, the inode-change-time of the file is set to the current 79time. 80.Sh RETURN VALUES 81Upon successful completion, a value of 0 is returned. 82Otherwise, a value of -1 is returned and 83.Va errno 84is set to indicate the error. 85.Sh ERRORS 86.Fn Utime 87will fail if: 88.Bl -tag -width Er 89.It Bq Er EACCES 90Search permission is denied for a component of the path prefix; 91or the 92.Fa times 93argument is 94.Dv NULL 95and the effective user ID of the process does not 96match the owner of the file, and is not the super-user, and write 97access is denied. 98.It Bq Er EFAULT 99.Xr File 100or 101.Fa times 102points outside the process's allocated address space. 103.It Bq Er EINVAL 104The pathname contains a character with the high-order bit set. 105.It Bq Er EIO 106An I/O error occurred while reading or writing the affected inode. 107.It Bq Er ELOOP 108Too many symbolic links were encountered in translating the pathname. 109.It Bq Er ENAMETOOLONG 110A component of a pathname exceeded 255 characters, 111or an entire path name exceeded 1023 characters. 112.It Bq Er ENOENT 113The named file does not exist. 114.It Bq Er ENOTDIR 115A component of the path prefix is not a directory. 116.It Bq Er EPERM 117The 118.Fa times 119argument is not 120.Dv NULL 121and the calling process's effective user ID 122does not match the owner of the file and is not the super-user. 123.It Bq Er EROFS 124The file system containing the file is mounted read-only. 125.El 126.Sh SEE ALSO 127.Xr stat 2 , 128.Xr utimes 2 129.Sh STANDARDS 130The 131.Fn utime 132function 133conforms to 134.St -p1003.1-88 . 135