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enable use of mmap(), falling back to read()/write() if mmap() fails.

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chs 2001-08-30 04:45:56 +00:00
parent 1de4b3e2e0
commit ec039eb93d
1 changed files with 18 additions and 18 deletions
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36
bin/cp/utils.c
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@ -1,4 +1,4 @@
/* $NetBSD: utils.c,v 1.18 2001/07/18 11:01:54 tron Exp $ */
/* $NetBSD: utils.c,v 1.19 2001/08/30 04:45:56 chs Exp $ */
/*-
* Copyright (c) 1991, 1993, 1994
@ -38,7 +38,7 @@
#if 0
static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94";
#else
__RCSID("$NetBSD: utils.c,v 1.18 2001/07/18 11:01:54 tron Exp $");
__RCSID("$NetBSD: utils.c,v 1.19 2001/08/30 04:45:56 chs Exp $");
#endif
#endif /* not lint */
@ -83,9 +83,7 @@ copy_file(entp, dne)
static char buf[MAXBSIZE];
struct stat to_stat, *fs;
int ch, checkch, from_fd, rcount, rval, to_fd, wcount;
#ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
char *p;
#endif
if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) {
warn("%s", entp->fts_path);
@ -141,33 +139,35 @@ copy_file(entp, dne)
* There's no reason to do anything other than close the file
* now if it's empty, so let's not bother.
*/
if (fs->st_size > 0) {
/*
* Mmap and write if less than 8M (the limit is so we don't totally
* trash memory on big files). This is really a minor hack, but it
* wins some CPU back.
* Mmap and write if less than 8M (the limit is so
* we don't totally trash memory on big files).
* This is really a minor hack, but it wins some CPU back.
*/
#ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
if (fs->st_size <= 8 * 1048576) {
if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
MAP_FILE|MAP_SHARED, from_fd, (off_t)0)) == (char *)-1) {
warn("%s", entp->fts_path);
rval = 1;
p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
MAP_FILE|MAP_SHARED, from_fd, (off_t)0);
if (p == MAP_FAILED) {
goto mmap_failed;
} else {
(void) madvise(p, (size_t)fs->st_size, MADV_SEQUENTIAL);
if (write(to_fd, p, fs->st_size) != fs->st_size) {
(void) madvise(p, (size_t)fs->st_size,
MADV_SEQUENTIAL);
if (write(to_fd, p, fs->st_size) !=
fs->st_size) {
warn("%s", to.p_path);
rval = 1;
}
/* Some systems don't unmap on close(2). */
if (munmap(p, fs->st_size) < 0) {
warn("%s", entp->fts_path);
rval = 1;
}
}
} else
#endif
{
} else {
mmap_failed:
while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
wcount = write(to_fd, buf, rcount);
if (rcount != wcount || wcount == -1) {