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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 usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* 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 and include the License file at usr/src/OPENSOLARIS.LICENSE.
* 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 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Internal utility routines for the ZFS library.
*/
#include <errno.h>
#include <fcntl.h>
#include <libintl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <sys/mnttab.h>
#include <libzfs.h>
#include "libzfs_impl.h"
int zfs_fd;
void (*error_func)(const char *, va_list);
/*
* All error handling is kept within libzfs where we have the most information
* immediately available. While this may not be suitable for a general purpose
* library, it greatly simplifies our commands. This command name is used to
* prefix all error messages appropriately.
*/
void
zfs_error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (error_func != NULL) {
error_func(fmt, ap);
} else {
(void) vfprintf(stderr, fmt, ap);
(void) fprintf(stderr, "\n");
}
va_end(ap);
}
/*
* An internal error is something that we cannot recover from, and should never
* happen (such as running out of memory). It should only be used in
* exceptional circumstances.
*/
void
zfs_fatal(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (error_func != NULL) {
error_func(fmt, ap);
} else {
(void) vfprintf(stderr, fmt, ap);
(void) fprintf(stderr, "\n");
}
va_end(ap);
exit(1);
}
/*
* Consumers (such as the JNI interface) that need to capture error output can
* override the default error handler using this function.
*/
void
zfs_set_error_handler(void (*func)(const char *, va_list))
{
error_func = func;
}
/*
* Display an out of memory error message and abort the current program.
*/
void
no_memory(void)
{
assert(errno == ENOMEM);
zfs_fatal(dgettext(TEXT_DOMAIN, "internal error: out of memory\n"));
}
/*
* A safe form of malloc() which will die if the allocation fails.
*/
void *
zfs_malloc(size_t size)
{
void *data;
if ((data = calloc(1, size)) == NULL)
no_memory();
return (data);
}
/*
* A safe form of strdup() which will die if the allocation fails.
*/
char *
zfs_strdup(const char *str)
{
char *ret;
if ((ret = strdup(str)) == NULL)
no_memory();
return (ret);
}
/*
* Initialize the library. Sets the command name used when reporting errors.
* This command name is used to prefix all error messages appropriately.
* Also opens /dev/zfs and dies if it cannot be opened.
*/
#pragma init(zfs_init)
void
zfs_init(void)
{
if ((zfs_fd = open(ZFS_DEV, O_RDWR)) < 0)
zfs_fatal(dgettext(TEXT_DOMAIN,
"internal error: cannot open zfs device"));
if ((mnttab_file = fopen(MNTTAB, "r")) == NULL)
zfs_fatal(dgettext(TEXT_DOMAIN, "internal error: unable to "
"open %s\n"), MNTTAB);
sharetab_file = fopen("/etc/dfs/sharetab", "r");
}
/*
* Cleanup function for library. Simply close the file descriptors that we
* opened as part of libzfs_init().
*/
#pragma fini(zfs_fini)
void
zfs_fini(void)
{
(void) close(zfs_fd);
}
/*
* Convert a number to an appropriately human-readable output.
*/
void
zfs_nicenum(uint64_t num, char *buf, size_t buflen)
{
uint64_t n = num;
int index = 0;
char u;
while (n >= 1024) {
n = (n + (1024 / 2)) / 1024; /* Round up or down */
index++;
}
u = " KMGTPE"[index];
if (index == 0)
(void) snprintf(buf, buflen, "%llu", n);
else if (n < 10 && (num & (num - 1)) != 0)
(void) snprintf(buf, buflen, "%.2f%c",
(double)num / (1ULL << 10 * index), u);
else if (n < 100 && (num & (num - 1)) != 0)
(void) snprintf(buf, buflen, "%.1f%c",
(double)num / (1ULL << 10 * index), u);
else
(void) snprintf(buf, buflen, "%llu%c", n, u);
}
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