projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 36c8bb59 JH |
1 | /* |
| 2 | * Copyright (c) 1993 Paul Kranenburg | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms, with or without | |
| 6 | * modification, are permitted provided that the following conditions | |
| 7 | * are met: | |
| 8 | * 1. Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| 13 | * 3. All advertising materials mentioning features or use of this software | |
| 14 | * must display the following acknowledgement: | |
| 15 | * This product includes software developed by Paul Kranenburg. | |
| 16 | * 4. The name of the author may not be used to endorse or promote products | |
| 17 | * derived from this software withough specific prior written permission | |
| 18 | * | |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
| 20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
| 21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
| 22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
| 24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
| 28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 | * | |
| 30 | * $Id$ | |
| 31 | */ | |
| 32 | ||
| 33 | #include <machine/vmparam.h> | |
| 34 | #include <sys/param.h> | |
| 35 | #include <stdio.h> | |
| 36 | #include <stdlib.h> | |
| 37 | #include <sys/types.h> | |
| 38 | #include <sys/stat.h> | |
| 39 | #include <sys/file.h> | |
| 40 | #include <sys/time.h> | |
| 41 | #include <sys/resource.h> | |
| 42 | #include <sys/mman.h> | |
| 43 | #ifndef BSD | |
| 44 | #define MAP_COPY MAP_PRIVATE | |
| 45 | #define MAP_FILE 0 | |
| 46 | #define MAP_ANON 0 | |
| 47 | #endif | |
| 48 | #include <fcntl.h> | |
| 49 | #include <a.out.h> | |
| 50 | #include <stab.h> | |
| 51 | #include <string.h> | |
| 52 | #if __STDC__ | |
| 53 | #include <stdarg.h> | |
| 54 | #else | |
| 55 | #include <varargs.h> | |
| 56 | #endif | |
| 57 | ||
| 58 | #include "ld.h" | |
| 59 | ||
| 60 | #ifndef BSD /* Need do better than this */ | |
| 61 | #define NEED_DEV_ZERO 1 | |
| 62 | #endif | |
| 63 | ||
| 64 | caddr_t | |
| 65 | sbrk(incr) | |
| 66 | int incr; | |
| 67 | { | |
| 68 | int fd = -1; | |
| 69 | caddr_t curbrk; | |
| 70 | ||
| 71 | /* Round-up increment to page size */ | |
| 72 | incr = ((incr + PAGSIZ - 1) & ~(PAGSIZ - 1)); | |
| 73 | ||
| 74 | #if DEBUG | |
| 75 | xprintf("sbrk: incr = %#x\n", incr); | |
| 76 | #endif | |
| 77 | ||
| 78 | #ifdef NEED_DEV_ZERO | |
| 79 | fd = open("/dev/zero", O_RDWR, 0); | |
| 80 | if (fd == -1) | |
| 81 | perror("/dev/zero"); | |
| 82 | #endif | |
| 83 | ||
| 84 | if ((curbrk = mmap(0, incr, | |
| 85 | PROT_READ|PROT_WRITE, | |
| 86 | MAP_ANON|MAP_COPY, fd, 0)) == (caddr_t)-1) { | |
| 87 | xprintf("Cannot map anonymous memory"); | |
| 88 | _exit(1); | |
| 89 | } | |
| 90 | ||
| 91 | #ifdef DEBUG | |
| 92 | xprintf("sbrk: curbrk = %#x\n", curbrk); | |
| 93 | #endif | |
| 94 | ||
| 95 | #ifdef NEED_DEV_ZERO | |
| 96 | close(fd); | |
| 97 | #endif | |
| 98 | ||
| 99 | return(curbrk); | |
| 100 | } | |
| 101 |