copy.c revision 3f54fd611f536639ec30dd53c48e5ec1897cc7d9
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1989-2011 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Eduardo Krell <ekrell@adexus.cl> *
* *
***********************************************************************/
#pragma prototyped
#include "3d.h"
#if _hdr_utime
#include <utime.h>
#else
struct utimbuf
{
time_t actime;
time_t modtime;
};
#endif
#define COPYBUF 8096
#if __sun__ || sun
#if _lib_mmap
#define COPYMAP (32*COPYBUF)
#endif
#endif
/*
* copy rfd to wfd
* return 0 if success, otherwise -1.
*/
int
fs3d_copy(int rfd, int wfd, struct stat* st)
{
register ssize_t n;
ssize_t filesize;
struct stat stbuf;
struct utimbuf ut;
char buf[COPYBUF];
#ifdef COPYMAP
off_t offset;
size_t munmapsize;
size_t mapsize;
char* mapbuf;
#endif
if (!st && FSTAT(rfd, st = &stbuf)) return -1;
if (!S_ISREG(st->st_mode)) return 0;
if ((filesize = st->st_size) <= 0)
filesize = 1;
#ifdef COPYMAP
mapsize = (filesize < COPYMAP) ? filesize : COPYMAP;
if ((filesize > COPYBUF) && ((mapbuf = mmap((caddr_t)0, mapsize, PROT_READ, MAP_SHARED, rfd, 0)) != ((caddr_t)-1)))
{
offset = 0;
munmapsize = mapsize;
for (;;)
{
if (write(wfd, mapbuf, mapsize) != mapsize)
{
munmap(mapbuf, munmapsize);
return -1;
}
filesize -= mapsize;
if (filesize <= 0) break;
offset += mapsize;
if (filesize < mapsize) mapsize = filesize;
if (mmap(mapbuf, mapsize, PROT_READ, MAP_SHARED|MAP_FIXED, rfd, offset) == (caddr_t)-1)
{
munmap(mapbuf, munmapsize);
return -1;
}
}
munmap(mapbuf, munmapsize);
}
#endif
if (filesize > 0)
{
while ((n = read(rfd, buf, COPYBUF)) > 0)
if (write(wfd, buf, n) != n)
return -1;
if (n < 0 || lseek(wfd, (off_t)0, 0)) return -1;
}
ut.actime = st->st_atime;
ut.modtime = st->st_mtime;
UTIME(state.path.name, &ut);
return 0;
}