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/*****************************************************************************
* Written by Chris Dunlap <cdunlap@llnl.gov>.
* Copyright (C) 2007-2022 Lawrence Livermore National Security, LLC.
* Copyright (C) 2001-2007 The Regents of the University of California.
* UCRL-CODE-2002-009.
*
* This file is part of ConMan: The Console Manager.
* For details, see <https://dun.github.io/conman/>.
*
* ConMan is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* ConMan is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with ConMan. If not, see <http://www.gnu.org/licenses/>.
*****************************************************************************
* Refer to "util.h" for documentation on public functions.
*****************************************************************************/
#if HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <errno.h>
#include <signal.h>
#include "log.h"
#include "util.h"
#ifdef WITH_OOMF
#undef out_of_memory
void * out_of_memory(void)
{
/* Example for an external Out-Of-Memory Function.
*/
log_err(0, "Out of memory");
return(NULL); /* not reached but prevents warnings */
}
#endif /* WITH_OOMF */
SigFunc * posix_signal(int signum, SigFunc *f)
{
/* A wrapper for the historical signal() function to do things the Posix way.
* cf. Stevens UNPv1 figure 5.6.
*/
struct sigaction act0, act1;
act1.sa_handler = f;
sigemptyset(&act1.sa_mask);
act1.sa_flags = 0;
if (signum == SIGALRM) {
#ifdef SA_INTERRUPT
act1.sa_flags |= SA_INTERRUPT; /* SunOS 4.x */
#endif /* SA_INTERRUPT */
}
else {
#ifdef SA_RESTART
act1.sa_flags |= SA_RESTART; /* SVR4, 4.4BSD */
#endif /* SA_RESTART */
}
/* Technically, this routine should return SIG_ERR if sigaction()
* fails here. But the caller would just log_err() away, anyways.
*/
if (sigaction(signum, &act1, &act0) < 0)
log_err(errno, "signal(%d) failed", signum);
return(act0.sa_handler);
}
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