about summary refs log tree commit diff
path: root/nptl/tst-exec5.c
blob: 72eb1cdbe6429d156167ecc7880926c5a72b8267 (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
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
/* Check if posix_spawn does not act as a cancellation entrypoint.
   Copyright (C) 2016-2023 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 <paths.h>
#include <pthread.h>
#include <signal.h>
#include <spawn.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>

static int do_test (void);
#define TEST_FUNCTION do_test ()
#include <test-skeleton.c>

static pthread_barrier_t b;

static pid_t pid;
static int pipefd[2];

static void *
tf (void *arg)
{
  xpthread_barrier_wait (&b);

  posix_spawn_file_actions_t a;
  if (posix_spawn_file_actions_init (&a) != 0)
    {
      puts ("error: spawn_file_actions_init failed");
      exit (1);
    }

  if (posix_spawn_file_actions_adddup2 (&a, pipefd[1], STDOUT_FILENO) != 0)
    {
      puts ("error: spawn_file_actions_adddup2 failed");
      exit (1);
    }

  if (posix_spawn_file_actions_addclose (&a, pipefd[0]) != 0)
    {
      puts ("error: spawn_file_actions_addclose");
      exit (1);
    }

  char *argv[] = { (char *) _PATH_BSHELL, (char *) "-c", (char *) "echo $$",
		   NULL };
  if (posix_spawn (&pid, _PATH_BSHELL, &a, NULL, argv, NULL) != 0)
    {
      puts ("error: spawn failed");
      exit (1);
    }

  return NULL;
}


static int
do_test (void)
{
  /* The test basically pipe a 'echo $$' created by a thread with a
     cancellation pending.  It then checks if the thread is not cancelled,
     the process is created and if the output is the expected one.  */

  if (pipe (pipefd) != 0)
    {
      puts ("error: pipe failed");
      exit (1);
    }

  /* Not interested in knowing when the pipe is closed.  */
  xsignal (SIGPIPE, SIG_IGN);

  /* To synchronize with the thread.  */
  if (pthread_barrier_init (&b, NULL, 2) != 0)
    {
      puts ("error: pthread_barrier_init failed");
      exit (1);
    }

  pthread_t th = xpthread_create (NULL, &tf, NULL);

  if (pthread_cancel (th) != 0)
    {
      puts ("error: pthread_cancel failed");
      return 1;
    }

  xpthread_barrier_wait (&b);

  if (xpthread_join (th) == PTHREAD_CANCELED)
    {
      puts ("error: thread cancelled");
      exit (1);
    }

  close (pipefd[1]);

  /* The global 'pid' should be set by thread posix_spawn calling.  Check
     below if it was executed correctly and with expected output.  */

  char buf[64];
  ssize_t n;
  bool seen_pid = false;
  while (TEMP_FAILURE_RETRY ((n = read (pipefd[0], buf, sizeof (buf)))) > 0)
    {
      /* We only expect to read the PID.  */
      char *endp;
      long int rpid = strtol (buf, &endp, 10);

      if (*endp != '\n')
	{
	  printf ("error: didn't parse whole line: \"%s\"\n", buf);
	  exit (1);
	}
      if (endp == buf)
	{
	  puts ("error: read empty line");
	  exit (1);
	}

      if (rpid != pid)
	{
	  printf ("error: found \"%s\", expected PID %ld\n", buf,
		 (long int) pid);
	  exit (1);
	}

      if (seen_pid)
	{
	  puts ("error: found more than one PID line");
	  exit (1);
	}

      seen_pid = true;
    }

  close (pipefd[0]);

  int status;
  int err = waitpid (pid, &status, 0);
  if (err != pid)
    {
      puts ("errnor: waitpid failed");
      exit (1);
    }

  if (!seen_pid)
    {
      puts ("error: didn't get PID");
      exit (1);
    }

  return 0;
}