filemon_dev.c revision 1.1.4.2
1 1.1.4.2 martin /* $NetBSD: filemon_dev.c,v 1.1.4.2 2020/04/13 08:05:44 martin Exp $ */ 2 1.1.4.2 martin 3 1.1.4.2 martin /*- 4 1.1.4.2 martin * Copyright (c) 2020 The NetBSD Foundation, Inc. 5 1.1.4.2 martin * All rights reserved. 6 1.1.4.2 martin * 7 1.1.4.2 martin * This code is derived from software contributed to The NetBSD Foundation 8 1.1.4.2 martin * by Taylor R. Campbell. 9 1.1.4.2 martin * 10 1.1.4.2 martin * Redistribution and use in source and binary forms, with or without 11 1.1.4.2 martin * modification, are permitted provided that the following conditions 12 1.1.4.2 martin * are met: 13 1.1.4.2 martin * 1. Redistributions of source code must retain the above copyright 14 1.1.4.2 martin * notice, this list of conditions and the following disclaimer. 15 1.1.4.2 martin * 2. Redistributions in binary form must reproduce the above copyright 16 1.1.4.2 martin * notice, this list of conditions and the following disclaimer in the 17 1.1.4.2 martin * documentation and/or other materials provided with the distribution. 18 1.1.4.2 martin * 19 1.1.4.2 martin * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.1.4.2 martin * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.1.4.2 martin * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.1.4.2 martin * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.1.4.2 martin * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.1.4.2 martin * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.1.4.2 martin * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.1.4.2 martin * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.1.4.2 martin * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.1.4.2 martin * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.1.4.2 martin * POSSIBILITY OF SUCH DAMAGE. 30 1.1.4.2 martin */ 31 1.1.4.2 martin 32 1.1.4.2 martin #include "filemon.h" 33 1.1.4.2 martin 34 1.1.4.2 martin #include <sys/ioctl.h> 35 1.1.4.2 martin 36 1.1.4.2 martin #include <errno.h> 37 1.1.4.2 martin #include <fcntl.h> 38 1.1.4.2 martin #include <stdlib.h> 39 1.1.4.2 martin #include <unistd.h> 40 1.1.4.2 martin 41 1.1.4.2 martin #ifdef HAVE_FILEMON_H 42 1.1.4.2 martin # include <filemon.h> 43 1.1.4.2 martin #endif 44 1.1.4.2 martin 45 1.1.4.2 martin #ifndef _PATH_FILEMON 46 1.1.4.2 martin #define _PATH_FILEMON "/dev/filemon" 47 1.1.4.2 martin #endif 48 1.1.4.2 martin 49 1.1.4.2 martin struct filemon { 50 1.1.4.2 martin int fd; 51 1.1.4.2 martin }; 52 1.1.4.2 martin 53 1.1.4.2 martin const char * 54 1.1.4.2 martin filemon_path(void) 55 1.1.4.2 martin { 56 1.1.4.2 martin 57 1.1.4.2 martin return _PATH_FILEMON; 58 1.1.4.2 martin } 59 1.1.4.2 martin 60 1.1.4.2 martin struct filemon * 61 1.1.4.2 martin filemon_open(void) 62 1.1.4.2 martin { 63 1.1.4.2 martin struct filemon *F; 64 1.1.4.2 martin unsigned i; 65 1.1.4.2 martin int error; 66 1.1.4.2 martin 67 1.1.4.2 martin /* Allocate and zero a struct filemon object. */ 68 1.1.4.2 martin F = calloc(1, sizeof(*F)); 69 1.1.4.2 martin if (F == NULL) 70 1.1.4.2 martin return NULL; 71 1.1.4.2 martin 72 1.1.4.2 martin /* Try opening /dev/filemon, up to six times (cargo cult!). */ 73 1.1.4.2 martin for (i = 0; (F->fd = open(_PATH_FILEMON, O_RDWR)) == -1; i++) { 74 1.1.4.2 martin if (i == 5) { 75 1.1.4.2 martin error = errno; 76 1.1.4.2 martin goto fail0; 77 1.1.4.2 martin } 78 1.1.4.2 martin } 79 1.1.4.2 martin 80 1.1.4.2 martin /* Success! */ 81 1.1.4.2 martin return F; 82 1.1.4.2 martin 83 1.1.4.2 martin fail0: free(F); 84 1.1.4.2 martin errno = error; 85 1.1.4.2 martin return NULL; 86 1.1.4.2 martin } 87 1.1.4.2 martin 88 1.1.4.2 martin int 89 1.1.4.2 martin filemon_setfd(struct filemon *F, int fd) 90 1.1.4.2 martin { 91 1.1.4.2 martin 92 1.1.4.2 martin /* Point the kernel at this file descriptor. */ 93 1.1.4.2 martin if (ioctl(F->fd, FILEMON_SET_FD, &fd) == -1) 94 1.1.4.2 martin return -1; 95 1.1.4.2 martin 96 1.1.4.2 martin /* No need for it in userland any more; close it. */ 97 1.1.4.2 martin (void)close(fd); 98 1.1.4.2 martin 99 1.1.4.2 martin /* Success! */ 100 1.1.4.2 martin return 0; 101 1.1.4.2 martin } 102 1.1.4.2 martin 103 1.1.4.2 martin void 104 1.1.4.2 martin filemon_setpid_parent(struct filemon *F, pid_t pid) 105 1.1.4.2 martin { 106 1.1.4.2 martin /* Nothing to do! */ 107 1.1.4.2 martin } 108 1.1.4.2 martin 109 1.1.4.2 martin int 110 1.1.4.2 martin filemon_setpid_child(const struct filemon *F, pid_t pid) 111 1.1.4.2 martin { 112 1.1.4.2 martin 113 1.1.4.2 martin /* Just pass it on to the kernel. */ 114 1.1.4.2 martin return ioctl(F->fd, FILEMON_SET_PID, &pid); 115 1.1.4.2 martin } 116 1.1.4.2 martin 117 1.1.4.2 martin int 118 1.1.4.2 martin filemon_close(struct filemon *F) 119 1.1.4.2 martin { 120 1.1.4.2 martin int error = 0; 121 1.1.4.2 martin 122 1.1.4.2 martin /* Close the filemon device fd. */ 123 1.1.4.2 martin if (close(F->fd) == -1 && error == 0) 124 1.1.4.2 martin error = errno; 125 1.1.4.2 martin 126 1.1.4.2 martin /* Free the filemon descriptor. */ 127 1.1.4.2 martin free(F); 128 1.1.4.2 martin 129 1.1.4.2 martin /* Set errno and return -1 if anything went wrong. */ 130 1.1.4.2 martin if (error) { 131 1.1.4.2 martin errno = error; 132 1.1.4.2 martin return -1; 133 1.1.4.2 martin } 134 1.1.4.2 martin 135 1.1.4.2 martin /* Success! */ 136 1.1.4.2 martin return 0; 137 1.1.4.2 martin } 138 1.1.4.2 martin 139 1.1.4.2 martin int 140 1.1.4.2 martin filemon_readfd(const struct filemon *F) 141 1.1.4.2 martin { 142 1.1.4.2 martin 143 1.1.4.2 martin return -1; 144 1.1.4.2 martin } 145 1.1.4.2 martin 146 1.1.4.2 martin int 147 1.1.4.2 martin filemon_process(struct filemon *F) 148 1.1.4.2 martin { 149 1.1.4.2 martin 150 1.1.4.2 martin return 0; 151 1.1.4.2 martin } 152
Indexes created Thu Oct 02 14:10:14 GMT 2025