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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at http://smartos.org/CDDL
*
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file.
*
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*
* Copyright 2020 Joyent, Inc.
*
*/
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/debug.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <libsysevent.h>
#include <sys/sysevent/eventdefs.h>
FILE *out;
static void
process_event(sysevent_t *ev)
{
char *class = NULL;
char *subclass = NULL;
/* get sysevent metadata and add to the nvlist */
class = sysevent_get_class_name(ev);
subclass = sysevent_get_subclass_name(ev);
if (class == NULL || subclass == NULL)
errx(EXIT_FAILURE, "failed to retrieve sysevent metadata");
VERIFY0(strcmp(class, EC_ZFS));
flockfile(out);
(void) fprintf(out, "Received %s.%s event\n", class, subclass);
(void) fflush(out);
funlockfile(out);
}
static void
child_fatal(int fd, const char *msg, ...)
{
va_list ap;
int fail = EXIT_FAILURE;
va_start(ap, msg);
(void) vfprintf(stderr, msg, ap);
va_end(ap);
(void) fputc('\n', stderr);
(void) write(fd, &fail, sizeof (fail));
(void) close(fd);
exit(EXIT_FAILURE);
}
static void
do_child(int fd, char * const subclasses[], size_t n)
{
sysevent_handle_t *handle;
int ret = 0;
if ((handle = sysevent_bind_handle(process_event)) == NULL) {
child_fatal(fd, "sysevent_bind_handle() failed: %s",
strerror(errno));
}
if (sysevent_subscribe_event(handle, EC_ZFS,
(const char **)subclasses, n) != 0) {
child_fatal(fd, "failed to subscribe to sysevents: %s",
strerror(errno));
}
(void) write(fd, &ret, sizeof (ret));
(void) close(fd);
/* leave stderr open so any errors get captured by test harness */
(void) fclose(stdin);
(void) fclose(stdout);
for (;;)
(void) pause();
}
static void
usage(const char *name)
{
(void) fprintf(stderr, "Usage: %s [-o outfile] zfs_event...\n", name);
exit(2);
}
int
main(int argc, char * const argv[])
{
const char *outfile = NULL;
pid_t child;
int fds[2];
int ret = 0;
int c;
while ((c = getopt(argc, argv, "o:")) != -1) {
switch (c) {
case 'o':
outfile = optarg;
break;
case '?':
(void) fprintf(stderr, "Invalid option -%c\n", optopt);
usage(argv[0]);
}
}
if (outfile != NULL) {
if ((out = fopen(optarg, "w")) == NULL)
err(EXIT_FAILURE, "unable to open %s", optarg);
} else {
out = stdout;
}
VERIFY0(pipe(fds));
switch (child = fork()) {
case -1:
err(EXIT_FAILURE, "unable to fork");
case 0:
do_child(fds[1], argv + optind, (size_t)(argc - optind));
break;
default:
break;
}
(void) close(fds[1]);
if (read(fds[0], &ret, sizeof (ret)) < 0)
err(EXIT_FAILURE, "failure waiting on child");
if (ret != 0)
return (ret);
(void) close(fds[0]);
(void) printf("%d\n", child);
return (0);
}
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