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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 (c) 1988 AT&T
* All Rights Reserved
*
* Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
*/
/*
* Utility functions
*/
#include <unistd.h>
#include <signal.h>
#include <locale.h>
#include <string.h>
#include "msg.h"
#include "_libld.h"
/*
* Exit after cleaning up.
*/
int
ld_exit(Ofl_desc *ofl)
{
/*
* If we have created an output file remove it.
*/
if ((ofl->ofl_fd > 0) && ((ofl->ofl_flags1 & FLG_OF1_NONREG) == 0))
(void) unlink(ofl->ofl_name);
/*
* Inform any support library that the link-edit has failed.
*/
ld_sup_atexit(ofl, 1);
/*
* Wrap up debug output file if one is open
*/
dbg_cleanup();
/* If any ERR_GUIDANCE messages were issued, add a summary */
if (ofl->ofl_guideflags & FLG_OFG_ISSUED)
ld_eprintf(ofl, ERR_GUIDANCE, MSG_INTL(MSG_GUIDE_SUMMARY));
return (1);
}
/*
* Establish the signals we're interested in, and the handlers that need to be
* reinstalled should any of these signals occur.
*/
typedef struct {
int signo;
void (* defhdl)();
} Signals;
static Signals signals[] = {
{ SIGHUP, SIG_DFL },
{ SIGINT, SIG_IGN },
{ SIGQUIT, SIG_DFL },
{ SIGBUS, SIG_DFL },
{ SIGTERM, SIG_IGN },
{ 0, 0 } };
static Ofl_desc *Ofl = NULL;
/*
* Define our signal handler.
*/
static void
/* ARGSUSED2 */
handler(int sig, siginfo_t *sip, void *utp)
{
struct sigaction nact;
Signals * sigs;
/*
* Reset all ignore handlers regardless of how we got here.
*/
nact.sa_handler = SIG_IGN;
nact.sa_flags = 0;
(void) sigemptyset(&nact.sa_mask);
for (sigs = signals; sigs->signo; sigs++) {
if (sigs->defhdl == SIG_IGN)
(void) sigaction(sigs->signo, &nact, NULL);
}
/*
* The model for creating an output file is to ftruncate() it to the
* required size and mmap() a mapping into which the new contents are
* written. Neither of these operations guarantee that the required
* disk blocks exist, and should we run out of disk space a bus error
* is generated.
* Other situations have been reported to result in ld catching a bus
* error (one instance was a stale NFS handle from an unstable server).
* Thus we catch all bus errors and hope we can decode a better error.
*/
if ((sig == SIGBUS) && sip && Ofl->ofl_name) {
ld_eprintf(Ofl, ERR_FATAL, MSG_INTL(MSG_FIL_INTERRUPT),
Ofl->ofl_name, strerror(sip->si_errno));
}
/*
* This assert(0) causes DEBUG enabled linkers to produce a core file.
*/
if ((sig != SIGHUP) && (sig != SIGINT))
assert(0);
exit(ld_exit(Ofl));
}
/*
* Establish a signal handler for all signals we're interested in.
*/
void
ld_init_sighandler(Ofl_desc *ofl)
{
struct sigaction nact, oact;
Signals * sigs;
Ofl = ofl;
/*
* Our heavy use of mmap() means that we are susceptible to
* receiving a SIGBUS in low diskspace situations. The main
* purpose of the signal handler is to handle that situation
* gracefully, so that out of disk errors don't drop a core file.
*
* In rare cases, this will prevent us from getting a core from a
* SIGBUS triggered by an internal alignment error in libld.
* If -znosighandler is set, return without registering the
* handler. This is primarily of use for debugging problems in
* the field, and is not of general interest.
*/
if (ofl->ofl_flags1 & FLG_OF1_NOSGHND)
return;
/*
* For each signal we're interested in set up a signal handler that
* insures we clean up any output file we're in the middle of creating.
*/
nact.sa_sigaction = handler;
(void) sigemptyset(&nact.sa_mask);
for (sigs = signals; sigs->signo; sigs++) {
if ((sigaction(sigs->signo, NULL, &oact) == 0) &&
(oact.sa_handler != SIG_IGN)) {
nact.sa_flags = SA_SIGINFO;
if (sigs->defhdl == SIG_DFL)
nact.sa_flags |= (SA_RESETHAND | SA_NODEFER);
(void) sigaction(sigs->signo, &nact, NULL);
}
}
}
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