86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2017, Lawrence Livermore National Security, LLC.
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*/
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/systeminfo.h>
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static unsigned long
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get_spl_hostid(void)
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{
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FILE *f;
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unsigned long hostid;
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char *env;
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/*
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* Allow the hostid to be subverted for testing.
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*/
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env = getenv("ZFS_HOSTID");
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if (env) {
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hostid = strtoull(env, NULL, 0);
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return (hostid & HOSTID_MASK);
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}
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f = fopen("/sys/module/spl/parameters/spl_hostid", "r");
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if (!f)
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return (0);
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if (fscanf(f, "%lu", &hostid) != 1)
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hostid = 0;
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fclose(f);
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return (hostid & HOSTID_MASK);
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}
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unsigned long
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get_system_hostid(void)
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{
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unsigned long system_hostid = get_spl_hostid();
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/*
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* We do not use the library call gethostid() because
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* it generates a hostid value that the kernel is
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* unaware of, if the spl_hostid module parameter has not
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* been set and there is no system hostid file (e.g.
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* /etc/hostid). The kernel and userspace must agree.
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* See comments above hostid_read() in the SPL.
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*/
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if (system_hostid == 0) {
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int fd, rc;
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unsigned long hostid;
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int hostid_size = 4; /* 4 bytes regardless of arch */
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fd = open("/etc/hostid", O_RDONLY);
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if (fd >= 0) {
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rc = read(fd, &hostid, hostid_size);
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if (rc > 0)
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system_hostid = (hostid & HOSTID_MASK);
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close(fd);
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}
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}
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return (system_hostid);
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}
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