1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dstest_pipe_client.cc Wed Mar 24 23:44:53 2021 +0100
1.3 @@ -0,0 +1,117 @@
1.4 +/*
1.5 + * Test pipe 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, offset_t step, offset_t 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 (offset_t offset = 0; offset < file_populated_span(file); offset += step)
1.44 + {
1.45 + printf("show %ld of %ld...\n", offset, file_populated_span(file));
1.46 +
1.47 + unsigned long remaining = file_populated_span(file) - offset;
1.48 + unsigned long sample_remaining = remaining < sample ? remaining : sample;
1.49 +
1.50 + printf("%ld bytes from %p...\n", sample_remaining, (file->memory + offset));
1.51 + strncpy(buf, (file->memory + offset), sample_remaining);
1.52 + buf[sample_remaining] = '\0';
1.53 + printf("%s\n", buf);
1.54 + }
1.55 +}
1.56 +
1.57 +int main(void)
1.58 +{
1.59 + /* Obtain access to the filesystem. */
1.60 +
1.61 + l4_cap_idx_t server = l4re_env_get_cap("server");
1.62 +
1.63 + /* Invoke the open method to receive the file reference. */
1.64 +
1.65 + file_t reader, writer;
1.66 + long err = pipe_open(&reader, &writer, server);
1.67 +
1.68 + if (err)
1.69 + {
1.70 + printf("Could not obtain pipe: %s\n", l4sys_errtostr(err));
1.71 + return 1;
1.72 + }
1.73 +
1.74 + /* Use the writer to fill the pipe with data. */
1.75 +
1.76 + for (int region = 0; region < 3; region++)
1.77 + {
1.78 + printf("Write %ld to pipe at %p...\n", file_span(&writer), writer.memory);
1.79 +
1.80 + memset(writer.memory, (int) 'a' + region, file_span(&writer));
1.81 +
1.82 + err = pipe_written(&writer, file_span(&writer));
1.83 +
1.84 + if (err)
1.85 + {
1.86 + printf("Written data error: %s\n", l4sys_errtostr(err));
1.87 + return 1;
1.88 + }
1.89 +
1.90 + show(&writer, page(1), 60);
1.91 +
1.92 + err = pipe_next(&writer);
1.93 +
1.94 + if (err)
1.95 + {
1.96 + printf("Region traversal error: %s\n", l4sys_errtostr(err));
1.97 + return 1;
1.98 + }
1.99 + }
1.100 +
1.101 + /* Use the reader to obtain data from the pipe. */
1.102 +
1.103 + err = pipe_current(&reader);
1.104 +
1.105 + while (!err)
1.106 + {
1.107 + printf("show...\n");
1.108 + show(&reader, page(1), 60);
1.109 + err = pipe_next(&reader);
1.110 + }
1.111 +
1.112 + if (err)
1.113 + printf("Reading termination condition: %s\n", l4sys_errtostr(err));
1.114 +
1.115 + printf("Data shown.\n");
1.116 +
1.117 + return 0;
1.118 +}
1.119 +
1.120 +// vim: tabstop=2 expandtab shiftwidth=2