/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2022 Jessica Clarke <jrtc27@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#define KILL_TIMEOUT 10
/*
* NB: Most of these do not need to be volatile, but a handful are used in
* signal handler contexts, so for simplicity we make them all volatile rather
* than duplicate the implementation.
*/
struct pipe_barrier {
volatile int fds[2];
};
static __inline int
pipe_barrier_init(struct pipe_barrier *p)
{
int error, fds[2], i;
error = pipe(fds);
if (error != 0)
return (error);
for (i = 0; i < 2; ++i)
p->fds[i] = fds[i];
return (0);
}
static __inline void
pipe_barrier_wait(struct pipe_barrier *p)
{
ssize_t ret;
char temp;
int fd;
fd = p->fds[0];
p->fds[0] = -1;
do {
ret = read(fd, &temp, 1);
} while (ret == -1 && errno == EINTR);
close(fd);
}
static __inline void
pipe_barrier_ready(struct pipe_barrier *p)
{
int fd;
fd = p->fds[1];
p->fds[1] = -1;
close(fd);
}
static __inline void
pipe_barrier_destroy_impl(struct pipe_barrier *p, int i)
{
int fd;
fd = p->fds[i];
if (fd != -1) {
p->fds[i] = -1;
close(fd);
}
}
static __inline void
pipe_barrier_destroy_wait(struct pipe_barrier *p)
{
pipe_barrier_destroy_impl(p, 0);
}
static __inline void
pipe_barrier_destroy_ready(struct pipe_barrier *p)
{
pipe_barrier_destroy_impl(p, 1);
}
static __inline void
pipe_barrier_destroy(struct pipe_barrier *p)
{
pipe_barrier_destroy_wait(p);
pipe_barrier_destroy_ready(p);
}
void reproduce_signal_death(int sig);
plain