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/* $OpenBSD: ungc.c,v 1.1 2021/06/01 13:13:10 mvs Exp $ */
/*
* Copyright (c) 2021 Vitaliy Makkoveev <mvs@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/un.h>
#include <stdio.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
union msg_control{
struct cmsghdr cmsgh;
char control[CMSG_SPACE(sizeof(int)*2)];
};
int main(int argc, char *argv[])
{
struct timespec ts_start, ts_now, ts_time;
union msg_control msg_control;
int iov_buf;
struct iovec iov;
struct msghdr msgh;
struct cmsghdr *cmsgh;
int s[2];
int infinite = 0;
if (argc > 1 && !strcmp(argv[1], "--infinite"))
infinite = 1;
if (!infinite)
if (clock_gettime(CLOCK_BOOTTIME, &ts_start) <0)
err(1, "clock_gettime");
while (1) {
if (socketpair(AF_UNIX, SOCK_STREAM|O_NONBLOCK, 0, s) < 0)
err(1, "socketpair");
iov_buf = 0;
iov.iov_base = &iov_buf;
iov.iov_len = sizeof(iov_buf);
msgh.msg_control = msg_control.control;
msgh.msg_controllen = sizeof(msg_control.control);
msgh.msg_iov = &iov;
msgh.msg_iovlen = 1;
msgh.msg_name = NULL;
msgh.msg_namelen = 0;
cmsgh = CMSG_FIRSTHDR(&msgh);
cmsgh->cmsg_len = CMSG_LEN(sizeof(int) * 2);
cmsgh->cmsg_level = SOL_SOCKET;
cmsgh->cmsg_type = SCM_RIGHTS;
*((int *)CMSG_DATA(cmsgh) + 0) = s[0];
*((int *)CMSG_DATA(cmsgh) + 1) = s[1];
if (sendmsg(s[0], &msgh, 0) < 0) {
if (errno != EMFILE)
err(1, "sendmsg");
}
close(s[0]);
close(s[1]);
if (!infinite) {
if (clock_gettime(CLOCK_BOOTTIME, &ts_now) <0)
err(1, "clock_gettime");
timespecsub(&ts_now, &ts_start, &ts_time);
if (ts_time.tv_sec >= 20)
break;
}
}
return 0;
}
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