Mercurial > illumos > illumos-gate
view usr/src/lib/libdtrace/common/dlink_init.c @ 13788:0cb9e2232ae0
3123 need a way to force loading of DTrace helpers
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Bryan Cantrill <bmc@joyent.com>
Approved by: Richard Lowe <richlowe@richlowe.net>
author | Adam H. Leventhal <ahl@delphix.com> |
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date | Tue, 28 Aug 2012 21:33:17 -0400 |
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/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (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 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * Copyright (c) 2012 by Delphix. All rights reserved. */ /* * This is the basis for drti.o which dt_link.c links into the object file * generated by dtrace(1M) -G by default (note that -xlazyload disables this). */ #include <dlfcn.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <dlink.h> static int gen; /* DOF helper generation */ extern dof_hdr_t __SUNW_dof; /* DOF defined in the .SUNW_dof section */ #pragma init(dtrace_drti_init) static void dtrace_drti_init(void) { Link_map *lmp; Lmid_t lmid; dtrace_link_init(); if (dlinfo(RTLD_SELF, RTLD_DI_LINKMAP, &lmp) == -1 || lmp == NULL) { dprintf(1, "couldn't discover module name or address\n"); return; } if (dlinfo(RTLD_SELF, RTLD_DI_LMID, &lmid) == -1) { dprintf(1, "couldn't discover link map ID\n"); return; } dtrace_link_dof(&__SUNW_dof, lmid, lmp->l_name, lmp->l_addr); } #pragma fini(dtrace_drti_fini) static void dtrace_drti_fini(void) { int fd; if ((fd = open64(devname, O_RDWR)) < 0) { dprintf(1, "failed to open helper device %s", devname); return; } if ((gen = ioctl(fd, DTRACEHIOC_REMOVE, gen)) == -1) dprintf(1, "DTrace ioctl failed to remove DOF (%d)\n", gen); else dprintf(1, "DTrace ioctl removed DOF (%d)\n", gen); (void) close(fd); }