83 lines
2 KiB
C
83 lines
2 KiB
C
/* $OpenBSD: unp-write-closed.c,v 1.1.1.1 2024/06/28 21:07:27 bluhm Exp $ */
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/*
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* Copyright (c) 2024 Vitaliy Makkoveev <mvs@openbsd.org>
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* Copyright (c) 2024 Alenander Bluhm <bluhm@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <errno.h>
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#include <signal.h>
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#include <unistd.h>
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sig_atomic_t done = 0;
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void
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handler(int sigraised)
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{
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done = 1;
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}
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int
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main(int argc, char *argv[])
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{
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int i, s[2], status;
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pid_t pid;
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if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
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err(1, "signal pipe");
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if (signal(SIGALRM, handler) == SIG_ERR)
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err(1, "signal alrm");
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alarm(30);
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while (!done) {
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, s) < 0)
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err(1, "socketpair");
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switch ((pid = fork())) {
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case -1:
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err(1, "fork");
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case 0:
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if (close(s[0]) < 0)
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err(1, "child close 0");
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if (close(s[1]) < 0)
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err(1, "child close 1");
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return 0;
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default:
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if (close(s[1]) < 0)
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err(1, "parent close 1");
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for (i = 1000000; i > 0; i--) {
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if (write(s[0], "1", 1) < 0)
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break;
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}
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if (i <= 0)
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errx(1, "write did not fail");
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if (errno != EPIPE)
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err(1, "write");
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if (close(s[0]) < 0)
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err(1, "parent close 1");
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if (waitpid(pid, &status, 0) < 0)
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err(1, "waitpid");
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if (status != 0)
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errx(1, "child status %d", status);
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break;
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}
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}
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return 0;
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}
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