1 /* 2 Copyright (C) 2004 Michael J. Silbersack. All rights reserved. 3 4 Redistribution and use in source and binary forms, with or without 5 modification, are permitted provided that the following conditions 6 are met: 7 1. Redistributions of source code must retain the above copyright 8 notice, this list of conditions and the following disclaimer. 9 2. Redistributions in binary form must reproduce the above copyright 10 notice, this list of conditions and the following disclaimer in the 11 documentation and/or other materials provided with the distribution. 12 13 THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 17 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 SUCH DAMAGE. 24 */ 25 26 #include <sys/types.h> 27 #include <sys/stat.h> 28 #include <sys/wait.h> 29 #include <sys/event.h> 30 #include <assert.h> 31 #include <err.h> 32 #include <errno.h> 33 #include <inttypes.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <unistd.h> 37 38 /* 39 * $FreeBSD$ 40 * The goal of this program is to see if fstat reports the correct 41 * data count for a pipe. Prior to revision 1.172 of sys_pipe.c, 42 * 0 would be returned once the pipe entered direct write mode. 43 * 44 * Linux (2.6) always returns zero, so it's not a valuable platform 45 * for comparison. 46 */ 47 48 int 49 main(void) 50 { 51 char buffer[32768], buffer2[32768], go[] = "go", go2[] = "go2"; 52 int desc[2], ipc_coord[2]; 53 struct kevent event, ke; 54 ssize_t error; 55 int successes = 0; 56 struct stat status; 57 pid_t new_pid; 58 int kq; 59 60 error = pipe(desc); 61 if (error == -1) 62 err(1, "Couldn't allocate data pipe"); 63 64 error = pipe(ipc_coord); 65 if (error == -1) 66 err(1, "Couldn't allocate IPC coordination pipe"); 67 68 new_pid = fork(); 69 assert(new_pid != -1); 70 71 close(new_pid == 0 ? desc[0] : desc[1]); 72 73 #define SYNC_R(i, _buf) do { \ 74 int _error = errno; \ 75 warnx("%d: waiting for synchronization", __LINE__); \ 76 if (read(ipc_coord[i], &_buf, sizeof(_buf)) != sizeof(_buf)) \ 77 err(1, "failed to synchronize (%s)", (i == 0 ? "parent" : "child")); \ 78 errno = _error; \ 79 } while(0) 80 81 #define SYNC_W(i, _buf) do { \ 82 int _error = errno; \ 83 warnx("%d: sending synchronization", __LINE__); \ 84 if (write(ipc_coord[i], &_buf, sizeof(_buf)) != sizeof(_buf)) \ 85 err(1, "failed to synchronize (%s)", (i == 0 ? "child" : "parent")); \ 86 errno = _error; \ 87 } while(0) 88 89 #define WRITE(s) do { \ 90 ssize_t _size; \ 91 if ((_size = write(desc[1], &buffer, s)) != s) \ 92 warn("short write; wrote %zd, expected %d", _size, s); \ 93 } while(0) 94 95 if (new_pid == 0) { 96 97 SYNC_R(0, go); 98 WRITE(145); 99 SYNC_W(0, go2); 100 101 SYNC_R(0, go); 102 WRITE(2048); 103 SYNC_W(0, go2); 104 105 SYNC_R(0, go); 106 WRITE(4096); 107 SYNC_W(0, go2); 108 109 SYNC_R(0, go); 110 WRITE(8191); 111 SYNC_W(0, go2); 112 113 SYNC_R(0, go); 114 SYNC_W(0, go2); /* XXX: why is this required? */ 115 WRITE(8192); 116 SYNC_W(0, go2); 117 118 close(ipc_coord[0]); 119 close(ipc_coord[1]); 120 121 _exit(0); 122 } 123 124 kq = kqueue(); 125 if (kq == -1) 126 _exit(1); 127 128 EV_SET(&ke, desc[0], EVFILT_READ, EV_ADD, 0, 0, NULL); 129 130 /* Attach event to the kqueue. */ 131 if (kevent(kq, &ke, 1, NULL, 0, NULL) != 0) 132 _exit(2); 133 134 while (successes < 5) { 135 SYNC_W(1, go); 136 SYNC_R(1, go2); 137 138 /* Ensure data is available to read */ 139 if (kevent(kq, NULL, 0, &event, 1, NULL) != 1) 140 _exit(3); 141 142 fstat(desc[0], &status); 143 error = read(desc[0], &buffer2, sizeof(buffer2)); 144 145 if (status.st_size != error) 146 err(1, "FAILURE: stat size %jd read size %zd", 147 (intmax_t)status.st_size, error); 148 if (error > 0) { 149 printf("SUCCESS at stat size %jd read size %zd\n", 150 (intmax_t)status.st_size, error); 151 successes++; 152 } 153 } 154 155 exit(0); 156 } 157