1 /* 2 * Test pipe operations. 3 * 4 * Copyright (C) 2020, 2021, 2022 Paul Boddie <paul@boddie.org.uk> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA 20 */ 21 22 #include <l4/re/env.h> 23 #include <l4/sys/err.h> 24 25 #include <thread> 26 27 #include <stdio.h> 28 #include <string.h> 29 #include <stdlib.h> 30 #include <unistd.h> /* sleep */ 31 32 #include <fsclient/client.h> 33 #include <systypes/fcntl.h> 34 35 36 37 /* Common size and iteration details. */ 38 39 const offset_t TO_TRANSFER = 600; 40 const int NUMBER_OF_ITERATIONS = 3; 41 42 43 44 /* Use the writer to fill the pipe with data. */ 45 46 static void write_pipe(file_t *writer, int number) 47 { 48 char buffer[TO_TRANSFER]; 49 long err; 50 51 /* Make writers blocking to permit synchronisation. */ 52 53 if ((err = client_set_blocking(writer, NOTIFY_SPACE_AVAILABLE))) 54 { 55 printf("Could not set pipe #%d as blocking: %s\n", number, l4sys_errtostr(err)); 56 return; 57 } 58 59 for (int loop = 0; loop < NUMBER_OF_ITERATIONS; loop++) 60 { 61 for (int region = 0; region < 26; region++) 62 { 63 memset(buffer, (int) 'a' + region, TO_TRANSFER); 64 65 offset_t nwritten = client_write(writer, buffer, TO_TRANSFER); 66 67 printf("Written %ld/%ld in #%d of %d/%d to pipe #%d...\n", nwritten, TO_TRANSFER, region, loop, 2, number); 68 } 69 70 sleep(1); 71 } 72 73 /* Flush to make the final output available. */ 74 75 client_close(writer); 76 } 77 78 /* Use the reader to obtain data from the pipe. */ 79 80 static void read_pipes(file_t *reader1, file_t *reader2) 81 { 82 offset_t totals[] = {0, 0}; 83 unsigned int active = 2; 84 long err; 85 file_t *reader; 86 87 /* Use a local notifier to wait for pipe events. */ 88 89 file_notifier_t *notifier = client_notifier_local(); 90 91 /* Register the readers for notification. */ 92 93 if ((err = client_subscribe(reader1, NOTIFY_CONTENT_AVAILABLE | NOTIFY_PEER_CLOSED, notifier)) || 94 (err = client_subscribe(reader2, NOTIFY_CONTENT_AVAILABLE | NOTIFY_PEER_CLOSED, notifier))) 95 { 96 printf("Could not subscribe to notifications: %s\n", l4sys_errtostr(err)); 97 return; 98 } 99 100 while (1) 101 { 102 char buffer[TO_TRANSFER]; 103 offset_t nread; 104 105 /* Wait for notification of content. */ 106 107 err = client_wait_files(&reader, notifier); 108 109 if (err) 110 { 111 printf("Error waiting for notifications: %s\n", l4sys_errtostr(err)); 112 client_notifier_close(notifier); 113 return; 114 } 115 116 if ((reader != reader1) && (reader != reader2)) 117 { 118 printf("Spurious notification received for %p versus %p, %p.\n", reader, reader1, reader2); 119 continue; 120 } 121 122 int p = reader == reader1 ? 0 : 1; 123 124 printf("Pipe #%d notified with conditions:%s%s\n", p + 1, reader->notifications & NOTIFY_PEER_CLOSED ? " closed" : "", 125 reader->notifications & NOTIFY_CONTENT_AVAILABLE ? " content" : ""); 126 127 nread = client_read(reader, buffer, TO_TRANSFER); 128 129 while (nread) 130 { 131 totals[p] += nread; 132 133 printf("Read %ld/%ld, total %ld, first %c, last %c, from pipe #%d...\n", nread, TO_TRANSFER, totals[p], *buffer, *(buffer + nread - 1), p + 1); 134 nread = client_read(reader, buffer, TO_TRANSFER); 135 } 136 137 /* Without any more content, a peer closed event should terminate reading 138 from the pipe. */ 139 140 if (reader->notifications & NOTIFY_PEER_CLOSED) 141 { 142 active--; 143 if (!active) 144 break; 145 } 146 } 147 148 client_close(reader1); 149 client_close(reader2); 150 client_notifier_close(notifier); 151 152 for (int p = 0; p < 2; p++) 153 { 154 printf("Data received for pipe #%d: %ld\n", p, totals[p]); 155 printf("Data shown for pipe #%d: %s\n", p, totals[p] == TO_TRANSFER * 26 * NUMBER_OF_ITERATIONS ? "True" : "False"); 156 } 157 } 158 159 int main(void) 160 { 161 /* Obtain pipe endpoint references. Blocking will be set up manually. */ 162 163 file_t *reader1, *reader2, *writer1, *writer2; 164 long err = client_pipe(&reader1, &writer1, O_NONBLOCK) || 165 client_pipe(&reader2, &writer2, O_NONBLOCK); 166 167 if (err) 168 { 169 printf("Could not obtain pipes: %s\n", l4sys_errtostr(err)); 170 return 1; 171 } 172 173 /* Schedule reader and writer threads. */ 174 175 std::thread *activities[3]; 176 177 activities[0] = new std::thread(read_pipes, reader1, reader2); 178 activities[1] = new std::thread(write_pipe, writer1, 1); 179 activities[2] = new std::thread(write_pipe, writer2, 2); 180 181 for (int i = 0; i < 3; i++) 182 activities[i]->join(); 183 } 184 185 // vim: tabstop=2 expandtab shiftwidth=2