* Copyright (c) 1988 Regents of the University of California.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
"@(#) Copyright (c) 1988 Regents of the University of California.\n\
static char sccsid
[] = "@(#)touch.c 4.8 (Berkeley) 6/1/90";
* Attempt to set the modify date of a file to the current date. If the
* file exists, read and write its first character. If the file doesn't
* exist, create it, unless -c option prevents it. If the file is read-only,
* -f forces chmod'ing and touch'ing.
static int dontcreate
; /* set if -c option */
static int force
; /* set if -f option */
dontcreate
= force
= retval
= 0;
while ((ch
= getopt(argc
, argv
, "cf")) != EOF
)
if (stat(filename
, &statbuffer
) == -1) {
return(readwrite(filename
, 0L));
fprintf(stderr
, "touch: %s: does not exist\n", filename
);
if ((statbuffer
.st_mode
& S_IFMT
) != S_IFREG
) {
fprintf(stderr
, "touch: %s: can only touch regular files\n",
if (!access(filename
, R_OK
| W_OK
))
return(readwrite(filename
,statbuffer
.st_size
));
if (chmod(filename
, 0666)) {
fprintf(stderr
, "touch: %s: couldn't chmod: ",
retval
= readwrite(filename
, statbuffer
.st_size
);
if (chmod(filename
, statbuffer
.st_mode
)) {
fprintf(stderr
, "touch: %s: couldn't chmod back: ",
fprintf(stderr
, "touch: %s: cannot touch\n", filename
);
readwrite(filename
, size
)
filedescriptor
= open(filename
, O_RDWR
, 0);
if (filedescriptor
== -1) {
error
: fprintf(stderr
, "touch: %s: ", filename
);
if (read(filedescriptor
, &first
, 1) != 1)
if (lseek(filedescriptor
, 0L, 0) == -1)
if (write(filedescriptor
, &first
, 1) != 1)
filedescriptor
= creat(filename
, 0666);
if (filedescriptor
== -1)
if (close(filedescriptor
) == -1)
fprintf(stderr
, "usage: touch [-cf] file ...\n");