1 /* 2 * Copyright (c) 2015 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by John Marino <draco@marino.st> 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 /* 35 * Each "hammer cleanup" command creates a pid file at /var/run with the 36 * name hammer.cleanup.$pid with the contents of $pid 37 * 38 * If the cleanup ends without incident, the pid file is removed. If the 39 * cleanup job is interrupted, the pid file is not removed. This is 40 * because SIGINT is disabled in deferrence to HAMMER ioctl. 41 * 42 * The "hammer abort-cleanup" command is simple. It scans /var/run for 43 * all files starting with "hammer.cleanup.", reads them, and issues a 44 * SIGINTR for any valid pid. Every hammer.cleanup.XXXXXX file will be 45 * removed after the command executes. If multiple cleanup jobs are 46 * running simultaneously, all of them will be aborted. 47 * 48 * It is intended any future "abort" commands are also placed in here. 49 */ 50 51 #include "hammer.h" 52 53 void 54 hammer_cmd_abort_cleanup(char **av __unused, int ac __unused) 55 { 56 DIR *dir; 57 pid_t pid; 58 char *str; 59 int pf_fd; 60 struct dirent *den; 61 static char pidfile[PIDFILE_BUFSIZE]; 62 static const char prefix[] = "hammer.cleanup."; 63 static const char termmsg[] = "Terminated cleanup process %u\n"; 64 const size_t pflen = sizeof(prefix) - 1; 65 66 if ((dir = opendir(pidfile_loc)) == NULL) { 67 return; 68 } 69 70 while ((den = readdir(dir)) != NULL) { 71 if (strncmp(den->d_name, prefix, pflen) == 0) { 72 snprintf (pidfile, PIDFILE_BUFSIZE, "%s/%s", 73 pidfile_loc, den->d_name); 74 pid = strtol((char *)(den->d_name + pflen), &str, 10); 75 pf_fd = open(pidfile, O_RDONLY | O_CLOEXEC); 76 if (pf_fd == -1) { 77 continue; 78 } 79 80 if (flock(pf_fd, LOCK_EX | LOCK_NB) < 0) { 81 if (errno == EWOULDBLOCK) { 82 /* error expected during cleanup */ 83 if (kill (pid, SIGTERM) == 0) { 84 printf (termmsg, pid); 85 } 86 } 87 } 88 else { 89 /* lock succeeded so pidfile is stale */ 90 flock (pf_fd, LOCK_UN); 91 } 92 close (pf_fd); 93 unlink (pidfile); 94 } 95 } 96 closedir(dir); 97 } 98