about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/tst-tgkill.c
blob: 9007000b2d9f0262657da233ea883122342b3d76 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
/* Smoke test for the tgkill system call.
   Copyright (C) 2019-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <signal.h>
#include <support/check.h>
#include <support/namespace.h>
#include <support/xthread.h>
#include <unistd.h>

/* Number of times sigusr1_handler has been invoked.  */
static volatile sig_atomic_t signals_delivered;

/* Expected TID of the thread receiving the signal.  */
static pid_t expected_signal_tid;

static void
sigusr1_handler (int signo)
{
  TEST_COMPARE (expected_signal_tid, gettid ());
  ++signals_delivered;
}

struct pid_and_tid
{
  pid_t pid;
  pid_t tid;
};

/* Send signals from the subprocess which are not expected to be
   delivered.  There is no handler for SIGUSR2, so delivery will
   result in a test failure.  CLOSURE must point to a valid PID/TID
   combination that is still running.  */
static void
subprocess_no_tid_match (void *closure)
{
  struct pid_and_tid *ids = closure;
  TEST_COMPARE (tgkill (ids->pid, gettid (), SIGUSR2), -1);
  TEST_COMPARE (errno, ESRCH);

  TEST_COMPARE (tgkill (getpid (), ids->tid, SIGUSR2), -1);
  TEST_COMPARE (errno, ESRCH);

  TEST_COMPARE (tgkill (getppid (), gettid (), SIGUSR2), -1);
  TEST_COMPARE (errno, ESRCH);
}

/* Called from threadfunc below.  */
static void
subprocess (void *closure)
{
  int original_tid = expected_signal_tid;

  /* Do not expect that the folloing signals are delivered to the
     subprocess.  The parent process retains the original
     expected_signal_tid value.  */
  expected_signal_tid = 0;
  TEST_COMPARE (tgkill (getpid (), original_tid, SIGUSR1), -1);
  TEST_COMPARE (errno, ESRCH);
  TEST_COMPARE (tgkill (getppid (), gettid (), SIGUSR1), -1);
  TEST_COMPARE (errno, ESRCH);
  TEST_COMPARE (expected_signal_tid, 0);

  /* This call has the correct PID/TID combination and is therefore
     expected to suceed.  */
  TEST_COMPARE (tgkill (getppid (), original_tid, SIGUSR1), 0);
}

static void *
threadfunc (void *closure)
{
  TEST_VERIFY (gettid () != getpid ());
  expected_signal_tid = gettid ();
  TEST_COMPARE (tgkill (getpid (), gettid (), SIGUSR1), 0);
  TEST_COMPARE (signals_delivered, 1);
  signals_delivered = 0;

  support_isolate_in_subprocess (subprocess, NULL);

  /* Check that exactly one signal arrived from the subprocess.  */
  TEST_COMPARE (signals_delivered, 1);

  support_isolate_in_subprocess (subprocess_no_tid_match,
                                 &(struct pid_and_tid)
                                 {
                                   .pid = getpid (),
                                   .tid = gettid (),
                                 });

  support_isolate_in_subprocess (subprocess_no_tid_match,
                                 &(struct pid_and_tid)
                                 {
                                   .pid = getpid (),
                                   .tid = getpid (),
                                 });

  return NULL;
}

static int
do_test (void)
{
  TEST_VERIFY_EXIT (signal (SIGUSR1, sigusr1_handler) != SIG_ERR);

  expected_signal_tid = gettid ();
  TEST_COMPARE (gettid (), getpid ());
  TEST_COMPARE (tgkill (getpid (), gettid (), SIGUSR1), 0);
  TEST_COMPARE (signals_delivered, 1);
  signals_delivered = 0;

  xpthread_join (xpthread_create (NULL, threadfunc, NULL));

  TEST_VERIFY (signal (SIGUSR1, SIG_DFL) == sigusr1_handler);
  return 0;
}

#include <support/test-driver.c>