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a2464ee127
This helper binary will run a given command on every on console, as defined by /etc/ttys (except for ttyv*, where only ttyv0 will be used). If one of the command processes exits, the rest will be killed. This will be used by a future change to start the installer on multiple consoles. Reviewed by: brooks, imp, gjb Differential Revision: https://reviews.freebsd.org/D36804
111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2022 Jessica Clarke <jrtc27@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#define KILL_TIMEOUT 10
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/*
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* NB: Most of these do not need to be volatile, but a handful are used in
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* signal handler contexts, so for simplicity we make them all volatile rather
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* than duplicate the implementation.
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*/
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struct pipe_barrier {
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volatile int fds[2];
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};
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static __inline int
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pipe_barrier_init(struct pipe_barrier *p)
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{
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int error, fds[2], i;
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error = pipe(fds);
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if (error != 0)
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return (error);
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for (i = 0; i < 2; ++i)
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p->fds[i] = fds[i];
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return (0);
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}
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static __inline void
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pipe_barrier_wait(struct pipe_barrier *p)
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{
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ssize_t ret;
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char temp;
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int fd;
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fd = p->fds[0];
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p->fds[0] = -1;
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do {
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ret = read(fd, &temp, 1);
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} while (ret == -1 && errno == EINTR);
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close(fd);
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}
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static __inline void
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pipe_barrier_ready(struct pipe_barrier *p)
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{
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int fd;
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fd = p->fds[1];
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p->fds[1] = -1;
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close(fd);
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}
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static __inline void
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pipe_barrier_destroy_impl(struct pipe_barrier *p, int i)
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{
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int fd;
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fd = p->fds[i];
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if (fd != -1) {
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p->fds[i] = -1;
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close(fd);
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}
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}
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static __inline void
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pipe_barrier_destroy_wait(struct pipe_barrier *p)
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{
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pipe_barrier_destroy_impl(p, 0);
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}
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static __inline void
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pipe_barrier_destroy_ready(struct pipe_barrier *p)
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{
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pipe_barrier_destroy_impl(p, 1);
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}
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static __inline void
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pipe_barrier_destroy(struct pipe_barrier *p)
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{
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pipe_barrier_destroy_wait(p);
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pipe_barrier_destroy_ready(p);
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}
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void reproduce_signal_death(int sig);
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