1 /* 2 * Copyright (c) 2006 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/test/debug/posixlock.c,v 1.1 2006/05/08 00:30:41 dillon Exp $ 35 */ 36 37 #include <sys/types.h> 38 #include <fcntl.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 #include <string.h> 43 #include <errno.h> 44 45 static void prompt(void); 46 47 int 48 main(int ac, char **av) 49 { 50 struct flock lk; 51 off_t save_start; 52 off_t save_len; 53 char c; 54 int r; 55 int fd; 56 char buf[256]; 57 58 if ((fd = open("test", O_CREAT|O_RDWR, 0666)) < 0) { 59 perror("open"); 60 exit(1); 61 } 62 prompt(); 63 while (fgets(buf, sizeof(buf), stdin) != NULL) { 64 bzero(&lk, sizeof(lk)); 65 c = '#'; 66 sscanf(buf, "%c %ld %ld", &c, &lk.l_start, &lk.l_len); 67 68 save_start = lk.l_start; 69 save_len = lk.l_len; 70 71 switch(c) { 72 case 'l': 73 lk.l_type = F_WRLCK; 74 while ((r = fcntl(fd, F_GETLK, &lk)) == 0) { 75 printf("%5d %c %jd %jd\n", 76 (int)lk.l_pid, 77 ((lk.l_type == F_WRLCK) ? 'x' : 78 (lk.l_type == F_RDLCK) ? 'r' : 79 (lk.l_type == F_UNLCK) ? 'u' : '?'), 80 lk.l_start, 81 lk.l_len 82 ); 83 if (lk.l_len == 0) 84 break; 85 lk.l_start += lk.l_len; 86 if (save_len) 87 lk.l_len = save_len - (lk.l_start - save_start); 88 else 89 lk.l_len = 0; 90 lk.l_type = F_WRLCK; 91 } 92 if (r < 0) 93 printf("%s\n", strerror(errno)); 94 break; 95 case 's': 96 lk.l_type = F_RDLCK; 97 if (fcntl(fd, F_SETLKW, &lk) == 0) { 98 printf("ok\n"); 99 } else { 100 printf("%s\n", strerror(errno)); 101 } 102 break; 103 case 'x': 104 lk.l_type = F_WRLCK; 105 if (fcntl(fd, F_SETLKW, &lk) == 0) { 106 printf("ok\n"); 107 } else { 108 printf("%s\n", strerror(errno)); 109 } 110 break; 111 case 'u': 112 lk.l_type = F_UNLCK; 113 if (fcntl(fd, F_SETLKW, &lk) == 0) { 114 printf("ok\n"); 115 } else { 116 printf("%s\n", strerror(errno)); 117 } 118 break; 119 case '?': 120 printf( 121 "l start len\tlist locks\n" 122 "s start len\tobtain a read lock\n" 123 "x start len\tobtain an exclusive lock\n" 124 "u start len\tounlock a range\n" 125 ); 126 break; 127 case '\n': 128 case '\0': 129 case '#': 130 break; 131 default: 132 printf("unknown command '%c'\n", c); 133 break; 134 } 135 prompt(); 136 } 137 return(0); 138 } 139 140 static 141 void 142 prompt(void) 143 { 144 printf("locker> "); 145 fflush(stdout); 146 } 147