1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/tests/dstest_block_client.cc Thu Apr 01 00:57:43 2021 +0200
1.3 @@ -0,0 +1,128 @@
1.4 +/*
1.5 + * Test dataspace operations.
1.6 + *
1.7 + * Copyright (C) 2020, 2021 Paul Boddie <paul@boddie.org.uk>
1.8 + *
1.9 + * This program is free software; you can redistribute it and/or
1.10 + * modify it under the terms of the GNU General Public License as
1.11 + * published by the Free Software Foundation; either version 2 of
1.12 + * the License, or (at your option) any later version.
1.13 + *
1.14 + * This program is distributed in the hope that it will be useful,
1.15 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.16 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.17 + * GNU General Public License for more details.
1.18 + *
1.19 + * You should have received a copy of the GNU General Public License
1.20 + * along with this program; if not, write to the Free Software
1.21 + * Foundation, Inc., 51 Franklin Street, Fifth Floor,
1.22 + * Boston, MA 02110-1301, USA
1.23 + */
1.24 +
1.25 +#include <l4/re/env.h>
1.26 +#include <l4/sys/err.h>
1.27 +
1.28 +#include <stdio.h>
1.29 +#include <string.h>
1.30 +#include <stdlib.h>
1.31 +
1.32 +#include "file.h"
1.33 +#include "memory_utils.h"
1.34 +
1.35 +
1.36 +
1.37 +static void show(file_t *file, unsigned long step, unsigned long sample)
1.38 +{
1.39 + /* Allocate a buffer for sampling from the file. */
1.40 +
1.41 + char buf[sample + 1];
1.42 +
1.43 + for (unsigned long offset = 0; offset < file_populated_span(file); offset += step)
1.44 + {
1.45 + unsigned long remaining = file_populated_span(file) - offset;
1.46 + unsigned long sample_remaining = remaining < sample ? remaining : sample;
1.47 +
1.48 + printf("%ld bytes from %p...\n", sample_remaining, (file->memory + offset));
1.49 + strncpy(buf, (file->memory + offset), sample_remaining);
1.50 + buf[sample_remaining] = '\0';
1.51 + printf("%s\n", buf);
1.52 + }
1.53 +}
1.54 +
1.55 +int main(int argc, char *argv[])
1.56 +{
1.57 + if (argc < 4)
1.58 + {
1.59 + printf("Need filename, step and sample size.\n");
1.60 + return 1;
1.61 + }
1.62 +
1.63 + /* Obtain filename and access parameters. */
1.64 +
1.65 + char *filename = argv[1];
1.66 + unsigned long step = atoi(argv[2]);
1.67 + unsigned long sample = atoi(argv[3]);
1.68 +
1.69 + /* Obtain access to the filesystem. */
1.70 +
1.71 + l4_cap_idx_t server = l4re_env_get_cap("server");
1.72 +
1.73 + /* Invoke the open method to receive the file reference. */
1.74 +
1.75 + file_t file;
1.76 + long err = file_open(&file, filename, server);
1.77 +
1.78 + if (err)
1.79 + {
1.80 + printf("Could not obtain file: %s\n", l4sys_errtostr(err));
1.81 + return 1;
1.82 + }
1.83 +
1.84 + /* A region of the file is mapped. */
1.85 +
1.86 + err = file_mmap(&file, 0, page(10));
1.87 +
1.88 + if (err)
1.89 + {
1.90 + printf("Could not map file region: %s\n", l4sys_errtostr(err));
1.91 + return 1;
1.92 + }
1.93 +
1.94 + show(&file, step, sample);
1.95 +
1.96 + /* Resizing must occur before writing beyond the end of file. Otherwise, the
1.97 + data may get discarded if the supporting flexpage needs to be flushed. */
1.98 +
1.99 + offset_t new_region = round(file_populated_span(&file), page(1));
1.100 +
1.101 + printf("Resize to %ld...\n", new_region + file_populated_span(&file));
1.102 +
1.103 + err = file_resize(&file, new_region + file_populated_span(&file));
1.104 +
1.105 + if (err)
1.106 + {
1.107 + printf("Could not resize file: %s\n", l4sys_errtostr(err));
1.108 + return 1;
1.109 + }
1.110 +
1.111 + printf("Resized file...\n");
1.112 +
1.113 + /* Copy the sampled data to another file region. */
1.114 +
1.115 + printf("Copy data to %ld...\n", new_region);
1.116 +
1.117 + for (unsigned long offset = 0; offset < file_populated_span(&file); offset += step)
1.118 + {
1.119 + memcpy(file.memory + new_region + offset, file.memory + offset, sample);
1.120 + if (step > sample)
1.121 + memset(file.memory + new_region + offset + sample, 0, step - sample);
1.122 + }
1.123 +
1.124 + show(&file, step, sample);
1.125 +
1.126 + printf("File shown.\n");
1.127 +
1.128 + return 0;
1.129 +}
1.130 +
1.131 +// vim: tabstop=2 expandtab shiftwidth=2