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/*-----------------------------------------------------------------------
File : cco_signals.c
Author: Stephan Schulz
Contents
Signal handler for limit signals...not really necessary, but may
work around some Solaris bugs.
Copyright 1998, 1999 by the author.
This code is released under the GNU General Public Licence and
the GNU Lesser General Public License.
See the file COPYING in the main E directory for details..
Run "eprover -h" for contact information.
Changes
<1> Fri Nov 6 14:50:28 MET 1998
New
-----------------------------------------------------------------------*/
#include "cio_signals.h"
/*---------------------------------------------------------------------*/
/* Global Variables */
/*---------------------------------------------------------------------*/
rlim_t ScheduleTimeLimit = 0;
rlim_t SystemTimeLimit = RLIM_INFINITY;
rlim_t SoftTimeLimit = RLIM_INFINITY;
rlim_t HardTimeLimit = RLIM_INFINITY;
sig_atomic_t TimeIsUp = 0;
sig_atomic_t TimeLimitIsSoft = 0;
static sig_atomic_t fatal_error_in_progress = 0;
bool SilentTimeOut = false;
/*---------------------------------------------------------------------*/
/* Forward Declarations */
/*---------------------------------------------------------------------*/
/*---------------------------------------------------------------------*/
/* Internal Functions */
/*---------------------------------------------------------------------*/
/*---------------------------------------------------------------------*/
/* Exported Functions */
/*---------------------------------------------------------------------*/
/*-----------------------------------------------------------------------
//
// Function: ESignalSetup()
//
// Set up ESignalHandler() as handle for mysignal, check for
// errors.
//
// Global Variables: -
//
// Side Effects : -
//
/----------------------------------------------------------------------*/
void ESignalSetup(int mysignal)
{
struct rlimit limit;
getrlimit(RLIMIT_CPU, &limit);
SystemTimeLimit = limit.rlim_max;
if(signal(mysignal, ESignalHandler) == SIG_ERR)
{
TmpErrno = errno;
SysError("Unable to set up signal handler", SYS_ERROR);
}
}
/*-----------------------------------------------------------------------
//
// Function: ESignalHandler()
//
// Handle signals...print message and exit or continue, depending on
// the signal.
//
// Global Variables: -
//
// Side Effects : May terminate program or print warning
//
/----------------------------------------------------------------------*/
void ESignalHandler(int mysignal)
{
struct rlimit limit;
switch(mysignal)
{
case SIGXCPU:
limit.rlim_max = SystemTimeLimit;
limit.rlim_cur = SystemTimeLimit;
if(setrlimit(RLIMIT_CPU, &limit))
{
TmpErrno = errno;
SysError("Unable to reset cpu time limit", SYS_ERROR);
}
VERBOSE(WriteStr(GlobalOutFD, "SIGXCPU caught.\n"););
if(TimeLimitIsSoft)
{
TimeIsUp = 1;
TimeLimitIsSoft = false;
limit.rlim_cur = MIN(HardTimeLimit, SystemTimeLimit);
if(setrlimit(RLIMIT_CPU, &limit))
{
TmpErrno = errno;
SysError("Unable to set cpu time limit to hard limit",
SYS_ERROR);
}
ESignalSetup(SIGXCPU); /* Reenable signal handler */
return;
}
if(SilentTimeOut)
{
exit(CPU_LIMIT_ERROR);
}
else
{
WriteStr(GlobalOutFD, "\n# Failure: Resource limit exceeded (time)\n");
TSTPOUTFD(GlobalOutFD, "ResourceOut");
Error("CPU time limit exceeded, terminating", CPU_LIMIT_ERROR);
}
break;
case SIGTERM:
case SIGINT:
VERBOSE(WriteStr(GlobalOutFD, "SIGTERM/SIGINT caught.\n"););
if(fatal_error_in_progress)
{
signal(mysignal, SIG_DFL);
raise(mysignal);
}
fatal_error_in_progress = 1;
TempFileCleanup();
raise(mysignal);
break;
default:
WriteStr(STDERR_FILENO, "Warning: ");
WriteStr(STDERR_FILENO, "Unexpected signal caught, continuing");
break;
}
}
/*---------------------------------------------------------------------*/
/* End of File */
/*---------------------------------------------------------------------*/
|
