diff options
author | jkh <jkh@FreeBSD.org> | 1993-12-11 21:06:36 +0000 |
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committer | jkh <jkh@FreeBSD.org> | 1993-12-11 21:06:36 +0000 |
commit | f9bc910bcd62149a239dccf9a69fea0e69b65901 (patch) | |
tree | dea01d42595e6c36a520e78c7db064bb270876b9 /gnu/usr.bin/ld | |
parent | 21990edfaba0490ac02d4556848156a82b0d78b5 (diff) | |
download | FreeBSD-src-f9bc910bcd62149a239dccf9a69fea0e69b65901.zip FreeBSD-src-f9bc910bcd62149a239dccf9a69fea0e69b65901.tar.gz |
Added sbrk() as new file.
Diffstat (limited to 'gnu/usr.bin/ld')
-rw-r--r-- | gnu/usr.bin/ld/rtld/sbrk.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/gnu/usr.bin/ld/rtld/sbrk.c b/gnu/usr.bin/ld/rtld/sbrk.c new file mode 100644 index 0000000..2d2c610 --- /dev/null +++ b/gnu/usr.bin/ld/rtld/sbrk.c @@ -0,0 +1,101 @@ +/* + * Copyright (c) 1993 Paul Kranenburg + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 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 Paul Kranenburg. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software withough specific prior written permission + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 SUCH DAMAGE. + * + * $Id$ + */ + +#include <machine/vmparam.h> +#include <sys/param.h> +#include <stdio.h> +#include <stdlib.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/file.h> +#include <sys/time.h> +#include <sys/resource.h> +#include <sys/mman.h> +#ifndef BSD +#define MAP_COPY MAP_PRIVATE +#define MAP_FILE 0 +#define MAP_ANON 0 +#endif +#include <fcntl.h> +#include <a.out.h> +#include <stab.h> +#include <string.h> +#if __STDC__ +#include <stdarg.h> +#else +#include <varargs.h> +#endif + +#include "ld.h" + +#ifndef BSD /* Need do better than this */ +#define NEED_DEV_ZERO 1 +#endif + +caddr_t +sbrk(incr) +int incr; +{ + int fd = -1; + caddr_t curbrk; + + /* Round-up increment to page size */ + incr = ((incr + PAGSIZ - 1) & ~(PAGSIZ - 1)); + +#if DEBUG +xprintf("sbrk: incr = %#x\n", incr); +#endif + +#ifdef NEED_DEV_ZERO + fd = open("/dev/zero", O_RDWR, 0); + if (fd == -1) + perror("/dev/zero"); +#endif + + if ((curbrk = mmap(0, incr, + PROT_READ|PROT_WRITE, + MAP_ANON|MAP_COPY, fd, 0)) == (caddr_t)-1) { + xprintf("Cannot map anonymous memory"); + _exit(1); + } + +#ifdef DEBUG +xprintf("sbrk: curbrk = %#x\n", curbrk); +#endif + +#ifdef NEED_DEV_ZERO + close(fd); +#endif + + return(curbrk); +} + |