| paul@50 | 1 | /* |
| paul@50 | 2 | * Test dataspace operations. |
| paul@50 | 3 | * |
| paul@330 | 4 | * Copyright (C) 2020, 2021, 2022 Paul Boddie <paul@boddie.org.uk> |
| paul@50 | 5 | * |
| paul@50 | 6 | * This program is free software; you can redistribute it and/or |
| paul@50 | 7 | * modify it under the terms of the GNU General Public License as |
| paul@50 | 8 | * published by the Free Software Foundation; either version 2 of |
| paul@50 | 9 | * the License, or (at your option) any later version. |
| paul@50 | 10 | * |
| paul@50 | 11 | * This program is distributed in the hope that it will be useful, |
| paul@50 | 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| paul@50 | 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| paul@50 | 14 | * GNU General Public License for more details. |
| paul@50 | 15 | * |
| paul@50 | 16 | * You should have received a copy of the GNU General Public License |
| paul@50 | 17 | * along with this program; if not, write to the Free Software |
| paul@50 | 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| paul@50 | 19 | * Boston, MA 02110-1301, USA |
| paul@50 | 20 | */ |
| paul@50 | 21 | |
| paul@50 | 22 | #include <l4/re/env.h> |
| paul@50 | 23 | #include <l4/sys/err.h> |
| paul@50 | 24 | |
| paul@85 | 25 | #include <systypes/fcntl.h> |
| paul@85 | 26 | |
| paul@50 | 27 | #include <stdio.h> |
| paul@50 | 28 | #include <string.h> |
| paul@50 | 29 | #include <stdlib.h> |
| paul@50 | 30 | |
| paul@94 | 31 | #include <fsclient/file.h> |
| paul@94 | 32 | #include <mem/memory_utils.h> |
| paul@50 | 33 | |
| paul@50 | 34 | |
| paul@50 | 35 | |
| paul@55 | 36 | static void show(file_t *file, unsigned long step, unsigned long sample) |
| paul@55 | 37 | { |
| paul@55 | 38 | /* Allocate a buffer for sampling from the file. */ |
| paul@55 | 39 | |
| paul@55 | 40 | char buf[sample + 1]; |
| paul@55 | 41 | |
| paul@55 | 42 | for (unsigned long offset = 0; offset < file_populated_span(file); offset += step) |
| paul@55 | 43 | { |
| paul@55 | 44 | unsigned long remaining = file_populated_span(file) - offset; |
| paul@55 | 45 | unsigned long sample_remaining = remaining < sample ? remaining : sample; |
| paul@55 | 46 | |
| paul@55 | 47 | printf("%ld bytes from %p...\n", sample_remaining, (file->memory + offset)); |
| paul@332 | 48 | memcpy(buf, (file->memory + offset), sample_remaining); |
| paul@55 | 49 | buf[sample_remaining] = '\0'; |
| paul@332 | 50 | |
| paul@332 | 51 | unsigned long leading = 0; |
| paul@332 | 52 | char *outbuf = buf; |
| paul@332 | 53 | |
| paul@332 | 54 | while ((*outbuf == '\0') && (leading < sample_remaining)) |
| paul@332 | 55 | { |
| paul@332 | 56 | outbuf++; |
| paul@332 | 57 | leading++; |
| paul@332 | 58 | } |
| paul@332 | 59 | |
| paul@332 | 60 | if (leading) |
| paul@332 | 61 | printf("[%ld zero bytes]\n", leading); |
| paul@332 | 62 | |
| paul@332 | 63 | printf("%s\n", outbuf); |
| paul@332 | 64 | |
| paul@332 | 65 | printf("[%ld bytes after string]\n", sample_remaining - leading - strlen(outbuf)); |
| paul@55 | 66 | } |
| paul@55 | 67 | } |
| paul@55 | 68 | |
| paul@50 | 69 | int main(int argc, char *argv[]) |
| paul@50 | 70 | { |
| paul@50 | 71 | if (argc < 4) |
| paul@50 | 72 | { |
| paul@50 | 73 | printf("Need filename, step and sample size.\n"); |
| paul@50 | 74 | return 1; |
| paul@50 | 75 | } |
| paul@50 | 76 | |
| paul@50 | 77 | /* Obtain filename and access parameters. */ |
| paul@50 | 78 | |
| paul@50 | 79 | char *filename = argv[1]; |
| paul@50 | 80 | unsigned long step = atoi(argv[2]); |
| paul@50 | 81 | unsigned long sample = atoi(argv[3]); |
| paul@50 | 82 | |
| paul@50 | 83 | /* Obtain access to the filesystem. */ |
| paul@50 | 84 | |
| paul@50 | 85 | l4_cap_idx_t server = l4re_env_get_cap("server"); |
| paul@50 | 86 | |
| paul@50 | 87 | /* Invoke the open method to receive the file reference. */ |
| paul@50 | 88 | |
| paul@50 | 89 | file_t file; |
| paul@85 | 90 | long err = file_open(&file, filename, O_RDWR, server); |
| paul@50 | 91 | |
| paul@50 | 92 | if (err) |
| paul@50 | 93 | { |
| paul@50 | 94 | printf("Could not obtain file: %s\n", l4sys_errtostr(err)); |
| paul@50 | 95 | return 1; |
| paul@50 | 96 | } |
| paul@50 | 97 | |
| paul@332 | 98 | /* A region of the file is mapped. Here, the start and length will not provide |
| paul@332 | 99 | page-aligned offsets, but the region is nevertheless not masked. */ |
| paul@50 | 100 | |
| paul@339 | 101 | err = file_mmap(&file, 10, 290, 0, 0, file_region_flags(file.flags)); |
| paul@50 | 102 | |
| paul@50 | 103 | if (err) |
| paul@50 | 104 | { |
| paul@50 | 105 | printf("Could not map file region: %s\n", l4sys_errtostr(err)); |
| paul@50 | 106 | return 1; |
| paul@50 | 107 | } |
| paul@50 | 108 | |
| paul@332 | 109 | printf("File contents:\n"); |
| paul@332 | 110 | |
| paul@55 | 111 | show(&file, step, sample); |
| paul@55 | 112 | |
| paul@332 | 113 | printf("File shown.\n"); |
| paul@332 | 114 | |
| paul@332 | 115 | /* A region of the file is mapped. Here, the resulting offsets will be used to |
| paul@332 | 116 | define a masked region. */ |
| paul@332 | 117 | |
| paul@339 | 118 | err = file_mmap(&file, 10, 290, 10, 290, file_region_flags(file.flags)); |
| paul@332 | 119 | |
| paul@332 | 120 | if (err) |
| paul@332 | 121 | { |
| paul@332 | 122 | printf("Could not map file region: %s\n", l4sys_errtostr(err)); |
| paul@332 | 123 | return 1; |
| paul@332 | 124 | } |
| paul@332 | 125 | |
| paul@332 | 126 | printf("File contents:\n"); |
| paul@332 | 127 | |
| paul@332 | 128 | show(&file, step, sample); |
| paul@332 | 129 | |
| paul@332 | 130 | printf("File shown.\n"); |
| paul@332 | 131 | |
| paul@55 | 132 | /* Resizing must occur before writing beyond the end of file. Otherwise, the |
| paul@55 | 133 | data may get discarded if the supporting flexpage needs to be flushed. */ |
| paul@55 | 134 | |
| paul@332 | 135 | offset_t old_size = file_populated_span(&file); |
| paul@332 | 136 | offset_t new_region = round(old_size, page(1)); |
| paul@332 | 137 | offset_t new_size = new_region + old_size; |
| paul@55 | 138 | |
| paul@332 | 139 | printf("Resize to %ld...\n", new_size); |
| paul@55 | 140 | |
| paul@332 | 141 | err = file_resize(&file, new_size); |
| paul@55 | 142 | |
| paul@55 | 143 | if (err) |
| paul@55 | 144 | { |
| paul@55 | 145 | printf("Could not resize file: %s\n", l4sys_errtostr(err)); |
| paul@55 | 146 | return 1; |
| paul@55 | 147 | } |
| paul@55 | 148 | |
| paul@55 | 149 | printf("Resized file...\n"); |
| paul@55 | 150 | |
| paul@332 | 151 | /* Re-map to avoid masking the region. */ |
| paul@332 | 152 | |
| paul@339 | 153 | err = file_mmap(&file, 10, new_size - 20, 0, 0, file_region_flags(file.flags)); |
| paul@332 | 154 | |
| paul@332 | 155 | if (err) |
| paul@332 | 156 | { |
| paul@332 | 157 | printf("Could not map file region: %s\n", l4sys_errtostr(err)); |
| paul@332 | 158 | return 1; |
| paul@332 | 159 | } |
| paul@332 | 160 | |
| paul@55 | 161 | /* Copy the sampled data to another file region. */ |
| paul@55 | 162 | |
| paul@55 | 163 | printf("Copy data to %ld...\n", new_region); |
| paul@55 | 164 | |
| paul@332 | 165 | for (unsigned long offset = 0; offset < old_size; offset += step) |
| paul@50 | 166 | { |
| paul@332 | 167 | printf("Copying to %ld...\n", new_region + offset); |
| paul@55 | 168 | memcpy(file.memory + new_region + offset, file.memory + offset, sample); |
| paul@55 | 169 | if (step > sample) |
| paul@55 | 170 | memset(file.memory + new_region + offset + sample, 0, step - sample); |
| paul@55 | 171 | } |
| paul@50 | 172 | |
| paul@332 | 173 | printf("File contents:\n"); |
| paul@332 | 174 | |
| paul@332 | 175 | show(&file, step, sample); |
| paul@332 | 176 | |
| paul@332 | 177 | printf("File shown.\n"); |
| paul@332 | 178 | |
| paul@332 | 179 | /* Re-map to mask the region again. */ |
| paul@332 | 180 | |
| paul@339 | 181 | err = file_mmap(&file, 0, new_size, 10, new_size - 20, file_region_flags(file.flags)); |
| paul@332 | 182 | |
| paul@332 | 183 | if (err) |
| paul@332 | 184 | { |
| paul@332 | 185 | printf("Could not map file region: %s\n", l4sys_errtostr(err)); |
| paul@332 | 186 | return 1; |
| paul@332 | 187 | } |
| paul@332 | 188 | |
| paul@332 | 189 | printf("File contents:\n"); |
| paul@332 | 190 | |
| paul@55 | 191 | show(&file, step, sample); |
| paul@55 | 192 | |
| paul@55 | 193 | printf("File shown.\n"); |
| paul@50 | 194 | |
| paul@50 | 195 | return 0; |
| paul@50 | 196 | } |
| paul@50 | 197 | |
| paul@50 | 198 | // vim: tabstop=2 expandtab shiftwidth=2 |
