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b897d72a5a
Changes since 20181221 are mostly portability related
hence the large gap in versions imported.
There are however some bug fixes, and a rework of filemon handling.
In NetBSD make/filemon/filemon_ktrace.c allows use of fktrace
and elimination of filemon(4) which has not had the TLC it needs.
FreeBSD filemon(4) is in much better shape, so bmake/filemon/filemon_dev.c
allows use of that, with a bit less overhead than the ktrace model.
Summary of changes from ChangeLog
o str.c: empty string does not match % pattern
plus unit-test changes
o var.c: import handling of old sysV style modifier using '%'
o str.c: refactor brk_string
o meta.c: meta_oodate, CHECK_VALID_META is too aggressive for CMD
a blank command is perfectly valid.
o meta.c: meta_oodate, check for corrupted meta file
earlier and more often.
* meta.c: meta_compat_parent check for USE_FILEMON
patch from Soeren Tempel
o meta.c: fix compat mode, need to call meta_job_output()
o job.c: extra fds for meta mode not needed if using filemon_dev
o meta.c: avoid passing NULL to filemon_*() when meta_needed()
returns FALSE.
o filemon/filemon_{dev,ktrace}.c: allow selection of
filemon implementation. filemon_dev.c uses the kernel module
while filemon_ktrace.c leverages the fktrace api available in
NetBSD. filemon_ktrace.c can hopefully form the basis for
adding support for other tracing mechanisms such as strace on
Linux.
o meta.c: when target is out-of-date per normal make rules
record value of .OODATE in meta file.
o parse.c: don't pass NULL to realpath(3)
some versions cannot handle it.
o parse.c: ParseDoDependency: free paths rather than assert
plus more unit-tests
152 lines
3.2 KiB
C
152 lines
3.2 KiB
C
/* $NetBSD: filemon_dev.c,v 1.1 2020/01/19 19:49:37 riastradh 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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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)) == -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, pid_t pid)
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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) {
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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)
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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)
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{
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return 0;
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}
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