projects / minimal.git / blame
| Commit | Line | Data |
|---|---|---|
| ee9c93b9 JF |
1 | /* Minimal - the simplest thing that could possibly work |
| 2 | * Copyright (C) 2007 Jay Freeman (saurik) | |
| 3 | */ | |
| 4 | ||
| 5 | /* | |
| 6 | * Redistribution and use in source and binary | |
| 7 | * forms, with or without modification, are permitted | |
| 8 | * provided that the following conditions are met: | |
| 9 | * | |
| 10 | * 1. Redistributions of source code must retain the | |
| 11 | * above copyright notice, this list of conditions | |
| 12 | * and the following disclaimer. | |
| 13 | * 2. Redistributions in binary form must reproduce the | |
| 14 | * above copyright notice, this list of conditions | |
| 15 | * and the following disclaimer in the documentation | |
| 16 | * and/or other materials provided with the | |
| 17 | * distribution. | |
| 18 | * 3. The name of the author may not be used to endorse | |
| 19 | * or promote products derived from this software | |
| 20 | * without specific prior written permission. | |
| 21 | * | |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' | |
| 23 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, | |
| 24 | * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
| 25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE | |
| 27 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 28 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
| 29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| 30 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
| 32 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR | |
| 33 | * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | |
| 34 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
| 35 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 36 | */ | |
| 37 | ||
| 64c5d5aa JF |
38 | #ifndef MINIMAL_MAPPING_H |
| 39 | #define MINIMAL_MAPPING_H | |
| 40 | ||
| d4987f7d JF |
41 | #include <sys/mman.h> |
| 42 | ||
| 43 | #include <errno.h> | |
| 44 | #include <unistd.h> | |
| 45 | ||
| 46 | #include <sys/types.h> | |
| 47 | #include <sys/stat.h> | |
| 48 | #include <fcntl.h> | |
| 49 | ||
| 20187605 JF |
50 | #include "minimal/stdlib.h" |
| 51 | ||
| c7409a79 | 52 | void *map(const char *path, size_t offset, size_t size, size_t *psize, bool ro) { |
| d4987f7d JF |
53 | int fd; |
| 54 | _syscall(fd = open(path, ro ? O_RDONLY : O_RDWR)); | |
| 55 | ||
| 3ed54889 JF |
56 | if (size == _not(size_t)) { |
| 57 | struct stat stat; | |
| 58 | _syscall(fstat(fd, &stat)); | |
| 59 | size = stat.st_size; | |
| 60 | } | |
| d4987f7d | 61 | |
| 3ed54889 JF |
62 | if (psize != NULL) |
| 63 | *psize = size; | |
| d4987f7d JF |
64 | |
| 65 | void *base; | |
| 3ed54889 | 66 | _syscall(base = mmap(NULL, size, ro ? PROT_READ : PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset)); |
| d4987f7d JF |
67 | |
| 68 | _syscall(close(fd)); | |
| 69 | return base; | |
| 70 | } | |
| 64c5d5aa JF |
71 | |
| 72 | #endif/*MINIMAL_MAPPING_H*/ |