mirror of
https://github.com/freebsd/freebsd-src
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a052cb4320
Most relevant change: o parse.c: try to include 'posix.mk' the first time .POSIX: is encountered, to allow for beter POSIX compliance. Others o cond.c: make debug logging for comparisons less technical o lst.c: fix mem leak in Lst_Remove o job.c: fix echoing of command with '-' in silent target in jobs mode o var.c: make debug logs more readable prefer 'long long' over 'long' on 32-bit C99 platforms fix crash on .undef of an environment variable
156 lines
3.4 KiB
C
156 lines
3.4 KiB
C
/* $NetBSD: filemon_dev.c,v 1.9 2022/03/04 23:17:16 sjg Exp $ */
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/*
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* Copyright (c) 2020 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Taylor R. Campbell.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "filemon.h"
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#ifdef HAVE_FILEMON_H
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# include <filemon.h>
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#endif
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#ifndef _PATH_FILEMON
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#define _PATH_FILEMON "/dev/filemon"
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#endif
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#ifndef MAKE_ATTR_UNUSED
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#define MAKE_ATTR_UNUSED __attribute__((__unused__))
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#endif
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struct filemon {
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int fd;
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};
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const char *
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filemon_path(void)
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{
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return _PATH_FILEMON;
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}
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struct filemon *
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filemon_open(void)
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{
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struct filemon *F;
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unsigned i;
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int error;
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/* Allocate and zero a struct filemon object. */
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F = calloc(1, sizeof *F);
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if (F == NULL)
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return NULL;
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/* Try opening /dev/filemon, up to six times (cargo cult!). */
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for (i = 0; (F->fd = open(_PATH_FILEMON, O_RDWR|O_CLOEXEC)) == -1; i++) {
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if (i == 5) {
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error = errno;
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goto fail0;
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}
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}
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/* Success! */
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return F;
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fail0: free(F);
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errno = error;
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return NULL;
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}
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int
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filemon_setfd(struct filemon *F, int fd)
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{
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/* Point the kernel at this file descriptor. */
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if (ioctl(F->fd, FILEMON_SET_FD, &fd) == -1)
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return -1;
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/* No need for it in userland any more; close it. */
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(void)close(fd);
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/* Success! */
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return 0;
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}
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void
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filemon_setpid_parent(struct filemon *F MAKE_ATTR_UNUSED, pid_t pid MAKE_ATTR_UNUSED)
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{
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/* Nothing to do! */
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}
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int
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filemon_setpid_child(const struct filemon *F, pid_t pid)
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{
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/* Just pass it on to the kernel. */
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return ioctl(F->fd, FILEMON_SET_PID, &pid);
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}
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int
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filemon_close(struct filemon *F)
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{
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int error = 0;
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/* Close the filemon device fd. */
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if (close(F->fd) == -1 && error == 0)
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error = errno;
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/* Free the filemon descriptor. */
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free(F);
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/* Set errno and return -1 if anything went wrong. */
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if (error != 0) {
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errno = error;
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return -1;
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}
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/* Success! */
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return 0;
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}
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int
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filemon_readfd(const struct filemon *F MAKE_ATTR_UNUSED)
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{
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return -1;
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}
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int
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filemon_process(struct filemon *F MAKE_ATTR_UNUSED)
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{
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return 0;
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}
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