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/* Copyright (C) 1992-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stddef.h>
#include <signal.h>
#include <errno.h>
#include <sigsetops.h>
/* If INTERRUPT is nonzero, make signal SIG interrupt system calls
(causing them to fail with EINTR); if INTERRUPT is zero, make system
calls be restarted after signal SIG. */
int
siginterrupt (int sig, int interrupt)
{
#ifdef SA_RESTART
extern sigset_t _sigintr attribute_hidden; /* Defined in signal.c. */
struct sigaction action;
if (__sigaction (sig, (struct sigaction *) NULL, &action) < 0)
return -1;
if (interrupt)
{
__sigaddset (&_sigintr, sig);
action.sa_flags &= ~SA_RESTART;
}
else
{
__sigdelset (&_sigintr, sig);
action.sa_flags |= SA_RESTART;
}
if (__sigaction (sig, &action, (struct sigaction *) NULL) < 0)
return -1;
return 0;
#else
__set_errno (ENOSYS);
return -1;
#endif
}
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