05c9107607
GEOM classes. It works by loading a shared library via dlopen(3) mechanism with class-specific code, it is also responsible for communicating with GEOM via libgeom(3). Per-class shared libraries are going to be stored in /lib/geom/ directory. It provides also few standard commands like 'list', 'load' and 'unload' for existing classes which aren't aware of geom(8). More info will be send on freebsd-current@ mailing list. Supported by: Wheel - Open Technologies - http://www.wheel.pl
756 lines
17 KiB
C
756 lines
17 KiB
C
/*-
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* Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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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 AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/linker.h>
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#include <sys/module.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include <libgen.h>
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#include <inttypes.h>
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#include <dlfcn.h>
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#include <assert.h>
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#include <libgeom.h>
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#include <geom.h>
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#include "misc/subr.h"
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static char comm[MAXPATHLEN], *class_name = NULL, *gclass_name = NULL;
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static uint32_t *version = NULL;
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static int verbose = 0;
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static struct g_command *class_commands = NULL;
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static void (*usage)(const char *name);
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static struct g_command *find_command(const char *cmdstr, int all);
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static int std_available(const char *name);
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static void std_list(struct gctl_req *req, unsigned flags);
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static void std_load(struct gctl_req *req, unsigned flags);
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static void std_unload(struct gctl_req *req, unsigned flags);
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struct g_command std_commands[] = {
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{ "list", 0, std_list, G_NULL_OPTS },
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{ "load", G_FLAG_VERBOSE | G_FLAG_LOADKLD, std_load, G_NULL_OPTS },
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{ "unload", G_FLAG_VERBOSE, std_unload, G_NULL_OPTS },
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G_CMD_SENTINEL
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};
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static void
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std_usage(const char *name)
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{
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struct g_command *cmd;
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struct g_option *opt;
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unsigned i, j;
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for (i = 0; ; i++) {
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cmd = &class_commands[i];
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if (cmd->gc_name == NULL)
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break;
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fprintf(stderr, "%s %s %s %s", i == 0 ? "usage:" : " ",
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name, class_name, cmd->gc_name);
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if ((cmd->gc_flags & G_FLAG_VERBOSE) != 0)
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fprintf(stderr, " [-v]");
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for (j = 0; ; j++) {
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opt = &cmd->gc_options[j];
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if (opt->go_name == NULL)
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break;
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if (opt->go_val != NULL || opt->go_type == G_TYPE_NONE)
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fprintf(stderr, " [");
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else
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fprintf(stderr, " ");
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fprintf(stderr, "-%c", opt->go_char);
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if (opt->go_type != G_TYPE_NONE)
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fprintf(stderr, " %s", opt->go_name);
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if (opt->go_val != NULL || opt->go_type == G_TYPE_NONE)
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fprintf(stderr, "]");
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}
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fprintf(stderr, " ...\n");
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}
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exit(EXIT_FAILURE);
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}
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static void
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geom_usage(void)
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{
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if (class_name == NULL) {
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errx(EXIT_FAILURE, "usage: %s <class name> <command> "
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"[options]", "geom");
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} else {
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const char *prefix;
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unsigned i;
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if (usage == NULL)
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prefix = "usage:";
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else {
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usage(comm);
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prefix = " ";
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}
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for (i = 0; ; i++) {
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struct g_command *cmd;
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cmd = &std_commands[i];
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if (cmd->gc_name == NULL)
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break;
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if (find_command(cmd->gc_name, 0) != NULL)
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continue;
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if (!std_available(cmd->gc_name))
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continue;
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fprintf(stderr, "%s %s %s", prefix, comm, cmd->gc_name);
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if ((cmd->gc_flags & G_FLAG_VERBOSE) != 0)
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fprintf(stderr, " [-v]");
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fprintf(stderr, "\n");
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prefix = " ";
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}
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exit(EXIT_FAILURE);
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}
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}
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static void
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load_module(void)
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{
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char name1[64], name2[64];
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snprintf(name1, sizeof(name1), "g_%s", class_name);
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snprintf(name2, sizeof(name2), "geom_%s", class_name);
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if (modfind(name1) < 0) {
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/* Not present in kernel, try loading it. */
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if (kldload(name2) < 0 || modfind(name1) < 0) {
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if (errno != EEXIST) {
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errx(EXIT_FAILURE,
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"%s module not available!", name2);
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}
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}
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}
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}
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static int
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strlcatf(char *str, size_t size, const char *format, ...)
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{
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size_t len;
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va_list ap;
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int ret;
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len = strlen(str);
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str += len;
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size -= len;
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va_start(ap, format);
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ret = vsnprintf(str, size, format, ap);
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va_end(ap);
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return (ret);
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}
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/*
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* Find given option in options available for given command.
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*/
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static struct g_option *
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find_option(struct g_command *cmd, char ch)
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{
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struct g_option *opt;
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unsigned i;
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for (i = 0; ; i++) {
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opt = &cmd->gc_options[i];
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if (opt->go_name == NULL)
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return (NULL);
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if (opt->go_char == ch)
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return (opt);
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}
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/* NOTREACHED */
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return (NULL);
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}
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/*
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* Add given option to gctl_req.
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*/
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static void
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set_option(struct gctl_req *req, struct g_option *opt, const char *val)
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{
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if (opt->go_type == G_TYPE_NUMBER) {
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intmax_t number;
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errno = 0;
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number = strtoimax(optarg, NULL, 0);
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if (errno != 0) {
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err(EXIT_FAILURE, "Invalid value for '%c' argument.",
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opt->go_char);
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}
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opt->go_val = malloc(sizeof(intmax_t));
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if (opt->go_val == NULL)
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errx(EXIT_FAILURE, "No memory.");
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*(intmax_t *)opt->go_val = number;
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gctl_ro_param(req, opt->go_name, sizeof(intmax_t), opt->go_val);
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} else if (opt->go_type == G_TYPE_STRING) {
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gctl_ro_param(req, opt->go_name, -1, optarg);
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} else /* if (opt->go_type == G_TYPE_NONE) */ {
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opt->go_val = malloc(sizeof(int));
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if (opt->go_val == NULL)
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errx(EXIT_FAILURE, "No memory.");
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*(int *)opt->go_val = *val - '0';
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gctl_ro_param(req, opt->go_name, sizeof(int),
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opt->go_val);
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}
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}
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/*
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* 1. Add given argument by caller.
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* 2. Add default values of not given arguments.
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* 3. Add the rest of arguments.
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*/
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static void
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parse_arguments(struct g_command *cmd, struct gctl_req *req, int *argc,
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char ***argv)
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{
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struct g_option *opt;
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char opts[64];
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unsigned i;
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int ch;
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*opts = '\0';
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if ((cmd->gc_flags & G_FLAG_VERBOSE) != 0)
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strlcat(opts, "v", sizeof(opts));
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for (i = 0; ; i++) {
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opt = &cmd->gc_options[i];
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if (opt->go_name == NULL)
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break;
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strlcatf(opts, sizeof(opts), "%c", opt->go_char);
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if (opt->go_type != G_TYPE_NONE)
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strlcat(opts, ":", sizeof(opts));
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}
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/*
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* Add specified arguments.
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*/
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while ((ch = getopt(*argc, *argv, opts)) != -1) {
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/* Standard (not passed to kernel) options. */
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switch (ch) {
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case 'v':
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verbose = 1;
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continue;
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}
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/* Options passed to kernel. */
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opt = find_option(cmd, ch);
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if (opt == NULL)
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geom_usage();
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if (G_OPT_ISDONE(opt)) {
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fprintf(stderr, "Flag '%c' specified twice.\n",
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opt->go_char);
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geom_usage();
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}
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G_OPT_DONE(opt);
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if (opt->go_type == G_TYPE_NONE)
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set_option(req, opt, "1");
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else
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set_option(req, opt, optarg);
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}
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*argc -= optind;
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*argv += optind;
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/*
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* Add not specified arguments, but with default values.
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*/
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for (i = 0; ; i++) {
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opt = &cmd->gc_options[i];
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if (opt->go_name == NULL)
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break;
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if (G_OPT_ISDONE(opt))
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continue;
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if (opt->go_type == G_TYPE_NONE) {
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assert(opt->go_val == NULL);
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set_option(req, opt, "0");
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} else {
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if (opt->go_val == NULL) {
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fprintf(stderr, "Flag '%c' not specified.\n",
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opt->go_char);
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geom_usage();
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} else {
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if (opt->go_type == G_TYPE_NUMBER) {
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gctl_ro_param(req, opt->go_name,
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sizeof(intmax_t), opt->go_val);
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} else /* if (opt->go_type == G_TYPE_STRING)*/ {
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gctl_ro_param(req, opt->go_name, -1,
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opt->go_val);
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}
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}
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}
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}
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/*
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* Add rest of given arguments.
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*/
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gctl_ro_param(req, "nargs", sizeof(int), argc);
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for (i = 0; i < (unsigned)*argc; i++) {
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char argname[16];
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snprintf(argname, sizeof(argname), "arg%u", i);
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gctl_ro_param(req, argname, -1, (*argv)[i]);
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}
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}
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/*
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* Find given command in commands available for given class.
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*/
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static struct g_command *
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find_command(const char *cmdstr, int all)
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{
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struct g_command *cmd;
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unsigned i;
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/*
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* First try to find command defined by loaded library.
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*/
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if (class_commands != NULL) {
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for (i = 0; ; i++) {
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cmd = &class_commands[i];
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if (cmd->gc_name == NULL)
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break;
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if (strcmp(cmd->gc_name, cmdstr) == 0)
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return (cmd);
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}
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}
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if (!all)
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return (NULL);
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/*
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* Now try to find in standard commands.
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*/
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for (i = 0; ; i++) {
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cmd = &std_commands[i];
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if (cmd->gc_name == NULL)
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break;
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if (!std_available(cmd->gc_name))
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continue;
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if (strcmp(cmd->gc_name, cmdstr) == 0)
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return (cmd);
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}
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return (NULL);
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}
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static unsigned
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set_flags(struct g_command *cmd)
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{
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unsigned flags = 0;
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if ((cmd->gc_flags & G_FLAG_VERBOSE) != 0 && verbose)
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flags |= G_FLAG_VERBOSE;
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return (flags);
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}
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/*
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* Run command.
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*/
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static void
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run_command(int argc, char *argv[])
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{
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struct g_command *cmd;
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struct gctl_req *req;
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const char *errstr;
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char buf[4096];
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cmd = find_command(argv[0], 1);
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if (cmd == NULL) {
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fprintf(stderr, "Unknown command: %s\n", argv[0]);
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geom_usage();
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}
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if ((cmd->gc_flags & G_FLAG_LOADKLD) != 0)
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load_module();
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req = gctl_get_handle();
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gctl_ro_param(req, "class", -1, gclass_name);
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gctl_ro_param(req, "verb", -1, argv[0]);
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if (version != NULL)
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gctl_ro_param(req, "version", sizeof(*version), version);
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parse_arguments(cmd, req, &argc, &argv);
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if (cmd->gc_func != NULL) {
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unsigned flags;
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flags = set_flags(cmd);
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cmd->gc_func(req, flags);
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errstr = req->error;
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} else {
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bzero(buf, sizeof(buf));
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gctl_rw_param(req, "output", sizeof(buf), buf);
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errstr = gctl_issue(req);
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}
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if (errstr != NULL) {
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fprintf(stderr, "%s\n", errstr);
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gctl_free(req);
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exit(EXIT_FAILURE);
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}
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if (*buf != '\0')
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printf("%s", buf);
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gctl_free(req);
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if (verbose)
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printf("Done.\n");
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exit(EXIT_SUCCESS);
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}
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static void
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load_library(void)
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{
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char path[MAXPATHLEN];
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uint32_t *lib_version;
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void *dlh;
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snprintf(path, sizeof(path), "%s/geom_%s.so", CLASSDIR, class_name);
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dlh = dlopen(path, RTLD_NOW);
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if (dlh == NULL) {
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#if 0
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fprintf(stderr, "Cannot open library %s, but continuing "
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"anyway.\n", path);
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#endif
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/*
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* Even if library cannot be loaded, standard commands are
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* available, so don't panic!
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*/
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return;
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}
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lib_version = dlsym(dlh, "lib_version");
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if (lib_version == NULL) {
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fprintf(stderr, "Cannot find symbol %s: %s.\n", "lib_version",
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dlerror());
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dlclose(dlh);
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exit(EXIT_FAILURE);
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}
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if (*lib_version != G_LIB_VERSION) {
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dlclose(dlh);
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errx(EXIT_FAILURE, "%s and %s are not synchronized.", comm,
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path);
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}
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version = dlsym(dlh, "version");
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if (version == NULL) {
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fprintf(stderr, "Cannot find symbol %s: %s.\n", "version",
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dlerror());
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dlclose(dlh);
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exit(EXIT_FAILURE);
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}
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class_commands = dlsym(dlh, "class_commands");
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if (class_commands == NULL) {
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fprintf(stderr, "Cannot find symbol %s: %s.\n",
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"class_commands", dlerror());
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dlclose(dlh);
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exit(EXIT_FAILURE);
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}
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usage = dlsym(dlh, "usage");
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if (usage == NULL)
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usage = std_usage;
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}
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/*
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* Class name should be all capital letters.
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*/
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static void
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set_class_name(void)
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{
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char *s1, *s2;
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gclass_name = malloc(strlen(class_name));
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if (gclass_name == NULL)
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errx(EXIT_FAILURE, "No memory");
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s1 = gclass_name;
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s2 = class_name;
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for (; *s2 != '\0'; s2++)
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*s1++ = toupper(*s2);
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*s1 = '\0';
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}
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static void
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get_class(int *argc, char ***argv)
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{
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snprintf(comm, sizeof(comm), "%s", basename((*argv)[0]));
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if (strcmp(comm, "geom") == 0) {
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if (*argc < 2)
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geom_usage();
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strlcatf(comm, sizeof(comm), " %s", (*argv)[1]);
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class_name = (*argv)[1];
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*argc -= 2;
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*argv += 2;
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} else if (*comm == 'g') {
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class_name = comm + 1;
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*argc -= 1;
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*argv += 1;
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} else {
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errx(EXIT_FAILURE, "Invalid utility name.");
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}
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set_class_name();
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load_library();
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if (*argc < 1)
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geom_usage();
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}
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int
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main(int argc, char *argv[])
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{
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get_class(&argc, &argv);
|
|
run_command(argc, argv);
|
|
/* NOTREACHED */
|
|
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
static struct gclass *
|
|
find_class(struct gmesh *mesh, const char *name)
|
|
{
|
|
struct gclass *classp;
|
|
|
|
LIST_FOREACH(classp, &mesh->lg_class, lg_class) {
|
|
if (strcmp(classp->lg_name, name) == 0)
|
|
return (classp);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
static struct gprovider *
|
|
find_provider(struct gclass *classp, const char *name)
|
|
{
|
|
struct ggeom *gp;
|
|
struct gprovider *pp;
|
|
|
|
LIST_FOREACH(gp, &classp->lg_geom, lg_geom) {
|
|
LIST_FOREACH(pp, &gp->lg_provider, lg_provider) {
|
|
if (strcmp(pp->lg_name, name) == 0)
|
|
return (pp);
|
|
}
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
static char *
|
|
genspaces(const char *text, size_t len)
|
|
{
|
|
static char spaces[256];
|
|
size_t outlen;
|
|
|
|
if (strlen(text) >= len) {
|
|
spaces[0] = '\0';
|
|
return (spaces);
|
|
}
|
|
memset(spaces, ' ', sizeof(spaces));
|
|
outlen = len - strlen(text);
|
|
if (outlen >= sizeof(spaces)) {
|
|
spaces[sizeof(spaces) - 1] = '\0';
|
|
return (spaces);
|
|
}
|
|
spaces[outlen] = '\0';
|
|
return (spaces);
|
|
}
|
|
|
|
static void
|
|
show_one(struct gprovider *pp)
|
|
{
|
|
struct gconfig *conf;
|
|
|
|
printf(" NAME: %s\n", pp->lg_name);
|
|
printf(" geom name: %s\n", pp->lg_geom->lg_name);
|
|
printf(" mediasize: %jd\n", (intmax_t)pp->lg_mediasize);
|
|
printf(" sectorsize: %u\n", pp->lg_sectorsize);
|
|
printf(" mode: %s\n", pp->lg_mode);
|
|
LIST_FOREACH(conf, &pp->lg_config, lg_config) {
|
|
printf("%s%s: %s\n", genspaces(conf->lg_name, 11),
|
|
conf->lg_name, conf->lg_val);
|
|
}
|
|
printf("\n");
|
|
}
|
|
|
|
static int
|
|
std_list_available(void)
|
|
{
|
|
struct gmesh mesh;
|
|
struct gclass *classp;
|
|
int error;
|
|
|
|
error = geom_gettree(&mesh);
|
|
if (error != 0)
|
|
exit(EXIT_FAILURE);
|
|
classp = find_class(&mesh, gclass_name);
|
|
geom_deletetree(&mesh);
|
|
if (classp != NULL)
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
std_list(struct gctl_req *req, unsigned flags __unused)
|
|
{
|
|
struct gmesh mesh;
|
|
struct gclass *classp;
|
|
struct gprovider *pp;
|
|
int error, *nargs;
|
|
|
|
error = geom_gettree(&mesh);
|
|
if (error != 0)
|
|
exit(EXIT_FAILURE);
|
|
classp = find_class(&mesh, gclass_name);
|
|
if (classp == NULL) {
|
|
geom_deletetree(&mesh);
|
|
fprintf(stderr, "Class %s not found.\n", gclass_name);
|
|
return;
|
|
}
|
|
nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
|
|
if (nargs == NULL) {
|
|
gctl_error(req, "No '%s' argument.", "nargs");
|
|
geom_deletetree(&mesh);
|
|
return;
|
|
}
|
|
if (*nargs > 0) {
|
|
int i;
|
|
|
|
for (i = 0; i < *nargs; i++) {
|
|
const char *name;
|
|
char param[16];
|
|
|
|
snprintf(param, sizeof(param), "arg%d", i);
|
|
name = gctl_get_asciiparam(req, param);
|
|
assert(name != NULL);
|
|
pp = find_provider(classp, name);
|
|
if (pp != NULL)
|
|
show_one(pp);
|
|
else {
|
|
fprintf(stderr, "No such provider: %s.\n",
|
|
name);
|
|
}
|
|
}
|
|
} else {
|
|
struct ggeom *gp;
|
|
|
|
LIST_FOREACH(gp, &classp->lg_geom, lg_geom) {
|
|
LIST_FOREACH(pp, &gp->lg_provider, lg_provider) {
|
|
show_one(pp);
|
|
}
|
|
}
|
|
}
|
|
geom_deletetree(&mesh);
|
|
}
|
|
|
|
static int
|
|
std_load_available(void)
|
|
{
|
|
char name[MAXPATHLEN], paths[MAXPATHLEN * 8], *p;
|
|
struct stat sb;
|
|
size_t len;
|
|
|
|
snprintf(name, sizeof(name), "g_%s", class_name);
|
|
/*
|
|
* If already in kernel, "load" command is not available.
|
|
*/
|
|
if (modfind(name) >= 0)
|
|
return (0);
|
|
bzero(paths, sizeof(paths));
|
|
len = sizeof(paths);
|
|
if (sysctlbyname("kern.module_path", paths, &len, NULL, 0) < 0)
|
|
err(EXIT_FAILURE, "sysctl(kern.module_path)");
|
|
for (p = strtok(paths, ";"); p != NULL; p = strtok(NULL, ";")) {
|
|
snprintf(name, sizeof(name), "%s/geom_%s.ko", p, class_name);
|
|
/*
|
|
* If geom_<name>.ko file exists, "load" command is available.
|
|
*/
|
|
if (stat(name, &sb) == 0)
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
std_load(struct gctl_req *req __unused, unsigned flags)
|
|
{
|
|
|
|
/*
|
|
* Do nothing special here, because of G_FLAG_LOADKLD flag,
|
|
* module is already loaded.
|
|
*/
|
|
if ((flags & G_FLAG_VERBOSE) != 0)
|
|
printf("Module available.\n");
|
|
}
|
|
|
|
static int
|
|
std_unload_available(void)
|
|
{
|
|
char name[64];
|
|
int id;
|
|
|
|
snprintf(name, sizeof(name), "geom_%s", class_name);
|
|
id = kldfind(name);
|
|
if (id >= 0)
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
std_unload(struct gctl_req *req, unsigned flags __unused)
|
|
{
|
|
char name[64];
|
|
int id;
|
|
|
|
snprintf(name, sizeof(name), "geom_%s", class_name);
|
|
id = kldfind(name);
|
|
if (id < 0) {
|
|
gctl_error(req, "Could not find module: %s.", strerror(errno));
|
|
return;
|
|
}
|
|
if (kldunload(id) < 0) {
|
|
gctl_error(req, "Could not unload module: %s.",
|
|
strerror(errno));
|
|
return;
|
|
}
|
|
}
|
|
|
|
static int
|
|
std_available(const char *name)
|
|
{
|
|
|
|
if (strcmp(name, "list") == 0)
|
|
return (std_list_available());
|
|
else if (strcmp(name, "load") == 0)
|
|
return (std_load_available());
|
|
else if (strcmp(name, "unload") == 0)
|
|
return (std_unload_available());
|
|
else
|
|
assert(!"Unknown standard command.");
|
|
return (0);
|
|
}
|