aboutsummaryrefslogtreecommitdiff
path: root/posix/tst-vfork2.c
blob: 65e41386fced8776c30e3633a3d2530f34b210de (plain)
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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
/* Test for vfork functions.
   Copyright (C) 2004-2023 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>

int raise_fail;

static void
alrm (int sig)
{
  if (raise (SIGUSR1) < 0)
    raise_fail = 1;
}

/* This test relies on non-POSIX functionality since the child
   processes call write, nanosleep and getpid.  */
static int
do_test (void)
{
  int result = 0;
  int fd[2];

  signal (SIGUSR1, SIG_IGN);

  struct sigaction sa;
  sa.sa_handler = alrm;
  sigemptyset (&sa.sa_mask);
  sa.sa_flags = 0;
  if (sigaction (SIGALRM, &sa, NULL) < 0)
    {
      puts ("couldn't set up SIGALRM handler");
      return 1;
    }

  if (pipe (fd) == -1)
    {
      puts ("pipe failed");
      return 1;
    }

  struct itimerval it;
  it.it_value.tv_sec = 0;
  it.it_value.tv_usec = 200 * 1000;
  it.it_interval = it.it_value;
  if (setitimer (ITIMER_REAL, &it, NULL) < 0)
    {
      puts ("couldn't set up timer");
      return 1;
    }

  /* First vfork() without previous getpid().  */
  pid_t p1;
  if ((p1 = vfork ()) == 0)
    {
      pid_t p = getpid ();

      struct timespec ts;
      ts.tv_sec = 1;
      ts.tv_nsec = 0;
      TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
      _exit (TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p))) != sizeof (p));
    }
  else if (p1 == -1)
    {
      puts ("1st vfork failed");
      result = 1;
    }

  memset (&it, 0, sizeof (it));
  setitimer (ITIMER_REAL, &it, NULL);

  pid_t p2 = 0;
  if (TEMP_FAILURE_RETRY (read (fd[0], &p2, sizeof (pid_t))) != sizeof (pid_t))
    {
      puts ("1st read failed");
      result = 1;
    }
  int r;
  if (TEMP_FAILURE_RETRY (waitpid (p1, &r, 0)) != p1)
    {
      puts ("1st waitpid failed");
      result = 1;
    }
  else if (r != 0)
    {
      puts ("write in 1st child failed");
      result = 1;
    }

  /* Main process' ID.  */
  pid_t p0 = getpid ();

  /* vfork() again, but after a getpid() in the main process.  */
  pid_t p3;
  if ((p3 = vfork ()) == 0)
    {
      pid_t p = getpid ();
      _exit (TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p))) != sizeof (p));
    }
  else if (p1 == -1)
    {
      puts ("2nd vfork failed");
      result = 1;
    }

  pid_t p4;
  if (TEMP_FAILURE_RETRY (read (fd[0], &p4, sizeof (pid_t))) != sizeof (pid_t))
    {
      puts ("2nd read failed");
      result = 1;
    }
  if (TEMP_FAILURE_RETRY (waitpid (p3, &r, 0)) != p3)
    {
      puts ("2nd waitpid failed");
      result = 1;
    }
  else if (r != 0)
    {
      puts ("write in 2nd child failed");
      result = 1;
    }

  /* And getpid in the main process again.  */
  pid_t p5 = getpid ();

  /* Analysis of the results.  */
  if (p0 != p5)
    {
      printf ("p0(%ld) != p5(%ld)\n", (long int) p0, (long int) p5);
      result = 1;
    }

  if (p0 == p1)
    {
      printf ("p0(%ld) == p1(%ld)\n", (long int) p0, (long int) p1);
      result = 1;
    }

  if (p1 != p2)
    {
      printf ("p1(%ld) != p2(%ld)\n", (long int) p1, (long int) p2);
      result = 1;
    }

  if (p0 == p3)
    {
      printf ("p0(%ld) == p3(%ld)\n", (long int) p0, (long int) p3);
      result = 1;
    }

  if (p3 != p4)
    {
      printf ("p3(%ld) != p4(%ld)\n", (long int) p3, (long int) p4);
      result = 1;
    }

  close (fd[0]);
  close (fd[1]);

  if (raise_fail)
    {
      puts ("raise failed");
      result = 1;
    }

  if (result == 0)
    puts ("All OK");

  return result;
}

#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"