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 <assert.h> 30 #include <err.h> 31 #include <errno.h> 32 #include <inttypes.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <unistd.h> 36 37 /* 38 * $FreeBSD$ 39 * The goal of this program is to see if fstat reports the correct 40 * data count for a pipe. Prior to revision 1.172 of sys_pipe.c, 41 * 0 would be returned once the pipe entered direct write mode. 42 * 43 * Linux (2.6) always returns zero, so it's not a valuable platform 44 * for comparison. 45 */ 46 47 int 48 main(void) 49 { 50 char buffer[32768], buffer2[32768], go[] = "go", go2[] = "go2"; 51 int desc[2], ipc_coord[2]; 52 ssize_t error; 53 int successes = 0; 54 struct stat status; 55 pid_t new_pid; 56 57 error = pipe(desc); 58 if (error == -1) 59 err(1, "Couldn't allocate data pipe"); 60 61 error = pipe(ipc_coord); 62 if (error == -1) 63 err(1, "Couldn't allocate IPC coordination pipe"); 64 65 new_pid = fork(); 66 assert(new_pid != -1); 67 68 close(new_pid == 0 ? desc[0] : desc[1]); 69 70 #define SYNC_R(i, _buf) do { \ 71 int _error = errno; \ 72 warnx("%d: waiting for synchronization", __LINE__); \ 73 if (read(ipc_coord[i], &_buf, sizeof(_buf)) != sizeof(_buf)) \ 74 err(1, "failed to synchronize (%s)", (i == 0 ? "parent" : "child")); \ 75 errno = _error; \ 76 } while(0) 77 78 #define SYNC_W(i, _buf) do { \ 79 int _error = errno; \ 80 warnx("%d: sending synchronization", __LINE__); \ 81 if (write(ipc_coord[i], &_buf, sizeof(_buf)) != sizeof(_buf)) \ 82 err(1, "failed to synchronize (%s)", (i == 0 ? "child" : "parent")); \ 83 errno = _error; \ 84 } while(0) 85 86 #define WRITE(s) do { \ 87 ssize_t _size; \ 88 if ((_size = write(desc[1], &buffer, s)) != s) \ 89 warn("short write; wrote %zd, expected %d", _size, s); \ 90 } while(0) 91 92 if (new_pid == 0) { 93 94 SYNC_R(0, go); 95 WRITE(145); 96 SYNC_W(0, go2); 97 98 SYNC_R(0, go); 99 WRITE(2048); 100 SYNC_W(0, go2); 101 102 SYNC_R(0, go); 103 WRITE(4096); 104 SYNC_W(0, go2); 105 106 SYNC_R(0, go); 107 WRITE(8191); 108 SYNC_W(0, go2); 109 110 SYNC_R(0, go); 111 SYNC_W(0, go2); /* XXX: why is this required? */ 112 WRITE(8192); 113 SYNC_W(0, go2); 114 115 close(ipc_coord[0]); 116 close(ipc_coord[1]); 117 118 _exit(0); 119 } 120 121 while (successes < 5) { 122 SYNC_W(1, go); 123 SYNC_R(1, go2); 124 fstat(desc[0], &status); 125 error = read(desc[0], &buffer2, sizeof(buffer2)); 126 127 if (status.st_size != error) 128 err(1, "FAILURE: stat size %jd read size %zd", 129 (intmax_t)status.st_size, error); 130 if (error > 0) { 131 printf("SUCCESS at stat size %jd read size %zd\n", 132 (intmax_t)status.st_size, error); 133 successes++; 134 } 135 } 136 137 exit(0); 138 } 139