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/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/NoticeExplan/
*/
/* $Id: tst_sig.c,v 1.13 2009/08/28 09:29:01 vapier Exp $ */
/*****************************************************************************
OS Testing - Silicon Graphics, Inc.
FUNCTION IDENTIFIER : tst_sig Set up for unexpected signals.
AUTHOR : David D. Fenner
CO-PILOT : Bill Roske
DATE STARTED : 06/06/90
This module may be linked with c-modules requiring unexpected
signal handling. The parameters to tst_sig are as follows:
fork_flag - set to FORK or NOFORK depending upon whether the
calling program executes a fork() system call. It
is normally the case that the calling program treats
SIGCLD as an expected signal if fork() is being used.
handler - a pointer to the unexpected signal handler to
be executed after an unexpected signal has been
detected. If handler is set to DEF_HANDLER, a
default handler is used. This routine should be
declared as function returning an int.
cleanup - a pointer to a cleanup routine to be executed
by the unexpected signal handler before tst_exit is
called. This parameter is set to NULL if no cleanup
routine is required. An external variable, T_cleanup
is set so that other user-defined handlers have
access to the cleanup routine. This routine should be
declared as returning type void.
***************************************************************************/
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include "test.h"
#define MAXMESG 150 /* size of mesg string sent to tst_res */
void (*T_cleanup) (); /* pointer to cleanup function */
/****************************************************************************
* STD_COPIES is defined in parse_opts.c but is externed here in order to
* test whether SIGCHILD should be ignored or not.
***************************************************************************/
extern int STD_COPIES;
static void def_handler(); /* default signal handler */
static void (*tst_setup_signal(int, void (*)(int))) (int);
/****************************************************************************
* tst_sig() : set-up to catch unexpected signals. fork_flag is set to NOFORK
* if SIGCLD is to be an "unexpected signal", otherwise it is set to
* FORK. cleanup points to a cleanup routine to be executed before
* tst_exit is called (cleanup is set to NULL if no cleanup is desired).
* handler is a pointer to the signal handling routine (if handler is
* set to NULL, a default handler is used).
***************************************************************************/
void tst_sig(int fork_flag, void (*handler) (), void (*cleanup) ())
{
int sig;
#ifdef _SC_SIGRT_MIN
long sigrtmin, sigrtmax;
#endif
/*
* save T_cleanup and handler function pointers
*/
T_cleanup = cleanup; /* used by default handler */
if (handler == DEF_HANDLER) {
/* use default handler */
handler = def_handler;
}
#ifdef _SC_SIGRT_MIN
sigrtmin = sysconf(_SC_SIGRT_MIN);
sigrtmax = sysconf(_SC_SIGRT_MAX);
#endif
/*
* now loop through all signals and set the handlers
*/
for (sig = 1; sig < NSIG; sig++) {
/*
* SIGKILL is never unexpected.
* SIGCLD is only unexpected when
* no forking is being done.
* SIGINFO is used for file quotas and should be expected
*/
#ifdef _SC_SIGRT_MIN
if (sig >= sigrtmin && sig <= sigrtmax)
continue;
#endif
switch (sig) {
case SIGKILL:
case SIGSTOP:
case SIGCONT:
#if !defined(_SC_SIGRT_MIN) && defined(__SIGRTMIN) && defined(__SIGRTMAX)
/* Ignore all real-time signals */
case __SIGRTMIN:
case __SIGRTMIN + 1:
case __SIGRTMIN + 2:
case __SIGRTMIN + 3:
case __SIGRTMIN + 4:
case __SIGRTMIN + 5:
case __SIGRTMIN + 6:
case __SIGRTMIN + 7:
case __SIGRTMIN + 8:
case __SIGRTMIN + 9:
case __SIGRTMIN + 10:
case __SIGRTMIN + 11:
case __SIGRTMIN + 12:
case __SIGRTMIN + 13:
case __SIGRTMIN + 14:
case __SIGRTMIN + 15:
/* __SIGRTMIN is 37 on HPPA rather than 32 *
* as on i386, etc. */
#if !defined(__hppa__)
case __SIGRTMAX - 15:
case __SIGRTMAX - 14:
case __SIGRTMAX - 13:
case __SIGRTMAX - 12:
case __SIGRTMAX - 11:
#endif
case __SIGRTMAX - 10:
case __SIGRTMAX - 9:
case __SIGRTMAX - 8:
case __SIGRTMAX - 7:
case __SIGRTMAX - 6:
case __SIGRTMAX - 5:
case __SIGRTMAX - 4:
case __SIGRTMAX - 3:
case __SIGRTMAX - 2:
case __SIGRTMAX - 1:
case __SIGRTMAX:
#endif
#ifdef CRAY
case SIGINFO:
case SIGRECOVERY: /* allow chkpnt/restart */
#endif /* CRAY */
#ifdef SIGSWAP
case SIGSWAP:
#endif /* SIGSWAP */
#ifdef SIGCKPT
case SIGCKPT:
#endif
#ifdef SIGRESTART
case SIGRESTART:
#endif
/*
* pthread-private signals SIGPTINTR and SIGPTRESCHED.
* Setting a handler for these signals is disallowed when
* the binary is linked against libpthread.
*/
#ifdef SIGPTINTR
case SIGPTINTR:
#endif /* SIGPTINTR */
#ifdef SIGPTRESCHED
case SIGPTRESCHED:
#endif /* SIGPTRESCHED */
#ifdef _SIGRESERVE
case _SIGRESERVE:
#endif
#ifdef _SIGDIL
case _SIGDIL:
#endif
#ifdef _SIGCANCEL
case _SIGCANCEL:
#endif
#ifdef _SIGGFAULT
case _SIGGFAULT:
#endif
break;
case SIGCLD:
if (fork_flag == FORK || STD_COPIES > 1)
continue;
default:
if (tst_setup_signal(sig, handler) == SIG_ERR)
tst_resm(TWARN|TERRNO,
"signal failed for signal %d", sig);
break;
}
#ifdef __sgi
/* On irix (07/96), signal() fails when signo is 33 or higher */
if (sig + 1 >= 33)
break;
#endif /* __sgi */
} /* endfor */
}
/****************************************************************************
* def_handler() : default signal handler that is invoked when
* an unexpected signal is caught.
***************************************************************************/
static void def_handler(int sig)
{
/*
* Break remaining test cases, do any cleanup, then exit
*/
tst_brkm(TBROK, T_cleanup,
"unexpected signal %d received (pid = %d).", sig, getpid());
}
/*
* tst_setup_signal - A function like signal(), but we have
* control over its personality.
*/
static void (*tst_setup_signal(int sig, void (*handler) (int))) (int)
{
struct sigaction my_act, old_act;
int ret;
my_act.sa_handler = handler;
my_act.sa_flags = SA_RESTART;
sigemptyset(&my_act.sa_mask);
ret = sigaction(sig, &my_act, &old_act);
if (ret == 0)
return old_act.sa_handler;
else
return SIG_ERR;
}
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