1 #include <util.h>
2 #include <stdlib.h>
3 #include <fcntl.h>
4 #include <termios.h>
5 #include <signal.h>
6 #include <darwintest.h>
7 #include <darwintest_multiprocess.h>
8
9 #define TEST_TIMEOUT 10
10
11 T_GLOBAL_META(
12 T_META_RUN_CONCURRENTLY(TRUE));
13
14 static void
sigio_handler(__unused int sig)15 sigio_handler(__unused int sig)
16 {
17 /* Do nothing; this should never actually be called. */
18 }
19
20 T_HELPER_DECL(pty_121077498_impl, "fork helper")
21 {
22 int primary, replica, flags;
23 char rname[128], c;
24 sigset_t sigio_set, received_set;
25
26 T_EXPECT_POSIX_SUCCESS(sigemptyset(&sigio_set), "sigemptyset");
27 T_EXPECT_POSIX_SUCCESS(sigaddset(&sigio_set, SIGIO), "sigaddset");
28
29 /*
30 * New session, lose any existing controlling terminal and become
31 * session leader.
32 */
33 T_EXPECT_POSIX_SUCCESS(setsid(), NULL);
34
35 /* Open the primary side, following `openpty`'s implementation. */
36 T_ASSERT_POSIX_SUCCESS(primary = posix_openpt(O_RDWR | O_NOCTTY), NULL);
37 T_ASSERT_POSIX_SUCCESS(grantpt(primary), NULL);
38 T_ASSERT_POSIX_SUCCESS(unlockpt(primary), NULL);
39 T_ASSERT_POSIX_SUCCESS(ptsname_r(primary, rname, sizeof(rname)), NULL);
40
41 /* Enable both O_NONBLOCK and O_ASYNC before opening the replica. */
42 T_ASSERT_POSIX_SUCCESS(flags = fcntl(primary, F_GETFL, 0), NULL);
43 flags |= O_NONBLOCK | O_ASYNC;
44 T_ASSERT_POSIX_SUCCESS(flags = fcntl(primary, F_SETFL, flags), NULL);
45
46 /* Open the replica, making it our controlling terminal. */
47 T_ASSERT_POSIX_SUCCESS(replica = open(rname, O_RDWR, 0), "open %s", rname);
48
49 /* Verify that we are non-blocking. */
50 T_EXPECT_POSIX_FAILURE(read(primary, &c, 1), EAGAIN, "read with no data returns EAGAIN");
51
52 /* Set us up to detect when we get a SIGIO. */
53 T_EXPECT_TRUE(SIG_ERR != signal(SIGIO, sigio_handler), "set SIGIO handler");
54 T_EXPECT_POSIX_SUCCESS(sigprocmask(SIG_BLOCK, &sigio_set, NULL), "block SIGIO");
55
56 /* Flush the replica, which should trigger a SIGIO. */
57 T_EXPECT_POSIX_SUCCESS(tcflush(replica, TCIOFLUSH), NULL);
58
59 /* Verify that we got SIGIO. */
60 T_ASSERT_POSIX_SUCCESS(sigpending(&received_set), NULL);
61 T_ASSERT_TRUE(sigismember(&received_set, SIGIO), "received SIGIO when we flushed");
62
63 /* Reset state. */
64 T_EXPECT_TRUE(SIG_ERR != signal(SIGIO, SIG_IGN), "reset SIGIO handler");
65 T_EXPECT_POSIX_SUCCESS(sigprocmask(SIG_UNBLOCK, &sigio_set, NULL), "unblock SIGIO");
66
67 /* Close fds. */
68 T_EXPECT_POSIX_SUCCESS(close(replica), NULL);
69 T_EXPECT_POSIX_SUCCESS(close(primary), NULL);
70 }
71
72 T_DECL(pty_121077498, "Ability to use O_NONBLOCK and O_ASYNC on pty primary without replica open.")
73 {
74 /*
75 * We need to do the test in a child process because we might have
76 * getpgrp() == getpid().
77 */
78 dt_helper_t helper = dt_child_helper("pty_121077498_impl");
79 dt_run_helpers(&helper, 1, TEST_TIMEOUT);
80 }
81