xref: /illumos-gate/usr/src/test/os-tests/tests/regression/illumos-15031.c (revision 37e2cd25d56b334a2403f2540a0b0a1e6a40bcd1)
1 /*
2  * This file and its contents are supplied under the terms of the
3  * Common Development and Distribution License ("CDDL"), version 1.0.
4  * You may only use this file in accordance with the terms of version
5  * 1.0 of the CDDL.
6  *
7  * A full copy of the text of the CDDL should have accompanied this
8  * source.  A copy of the CDDL is also available via the Internet at
9  * http://www.illumos.org/license/CDDL.
10  */
11 
12 /*
13  * Copyright 2022 Oxide Computer Company
14  */
15 
16 #include <stdio.h>
17 #include <unistd.h>
18 #include <stdlib.h>
19 #include <fcntl.h>
20 #include <port.h>
21 #include <err.h>
22 #include <assert.h>
23 #include <sys/types.h>
24 #include <sys/stat.h>
25 #include <sys/param.h>
26 #include <sys/poll.h>
27 #include <stdbool.h>
28 
29 static bool
has_event(int pfd)30 has_event(int pfd)
31 {
32 	port_event_t ev = { 0 };
33 	timespec_t ts = { 0 };
34 
35 	/* Because of illumos 14912, more care needs to be taken here */
36 	int res = port_get(pfd, &ev, &ts);
37 	if (res != 0 || ev.portev_source == 0) {
38 		return (false);
39 	} else {
40 		return (true);
41 	}
42 }
43 
44 int
main(int argc,char * argv[])45 main(int argc, char *argv[])
46 {
47 	int res;
48 	int pipes[2];
49 
50 	res = pipe2(pipes, 0);
51 	assert(res == 0);
52 
53 	int pfd = port_create();
54 	assert(pfd >= 0);
55 
56 	res = port_associate(pfd, PORT_SOURCE_FD, (uintptr_t)pipes[1], POLLIN,
57 	    NULL);
58 	assert(res == 0);
59 
60 	if (has_event(pfd)) {
61 		errx(EXIT_FAILURE, "FAIL - unexpected early event");
62 	}
63 
64 	char port_path[MAXPATHLEN];
65 	(void) sprintf(port_path, "/proc/%d/fd/%d", getpid(), pfd);
66 
67 	/* incur the procfs FDINFO access */
68 	struct stat sbuf;
69 	res = lstat(port_path, &sbuf);
70 	assert(res == 0);
71 
72 	/* write a byte to wake up the pipe */
73 	(void) write(pipes[0], port_path, 1);
74 
75 	/*
76 	 * Check to see that the FDINFO access did not detach our registration
77 	 * for the event port.
78 	 */
79 	if (!has_event(pfd)) {
80 		errx(EXIT_FAILURE, "FAIL - no event found");
81 	}
82 
83 	(void) printf("PASS\n");
84 	return (EXIT_SUCCESS);
85 }
86