File: tst-vfork3.c

package info (click to toggle)
glibc 2.28-8
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, experimental, sid
  • size: 271,788 kB
  • sloc: ansic: 1,008,637; asm: 259,607; makefile: 11,271; sh: 10,477; python: 6,910; cpp: 4,992; perl: 2,258; awk: 2,005; yacc: 290; pascal: 182; sed: 73
file content (175 lines) | stat: -rw-r--r-- 4,753 bytes parent folder | download | duplicates (4)
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
/* Test for vfork functions.
   Copyright (C) 2007-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Jakub Jelinek <jakub@redhat.com>, 2007.

   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
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <fcntl.h>
#include <mcheck.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/wait.h>

static int do_test (void);
static void do_prepare (void);
char *tmpdirname;

#define TEST_FUNCTION do_test ()
#define PREPARE(argc, argv) do_prepare ()
#include "../test-skeleton.c"

static void
run_script (const char *script, char *const argv[])
{
  for (size_t i = 0; i < 5; i++)
    {
      pid_t pid = vfork ();
      if (pid < 0)
	FAIL_EXIT1 ("vfork failed: %m");
      else if (pid == 0)
	{
	  execvp (script, argv);
	  _exit (errno);
	}

      int status;
      if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
	FAIL_EXIT1 ("waitpid failed");
      else if (status != 0)
	{
	  if (WIFEXITED (status))
	    FAIL_EXIT1 ("%s failed with status %d\n", script,
			WEXITSTATUS (status));
	  else
	    FAIL_EXIT1 ("%s killed by signal %d\n", script,
			WTERMSIG (status));
	}
    }
}

static int
do_test (void)
{
  mtrace ();

  const char *path = getenv ("PATH");
  if (path == NULL)
    path = "/bin";
  char pathbuf[strlen (tmpdirname) + 1 + strlen (path) + 1];
  strcpy (stpcpy (stpcpy (pathbuf, tmpdirname), ":"), path);
  if (setenv ("PATH", pathbuf, 1) < 0)
    {
      puts ("setenv failed");
      return 1;
    }

  /* Although manual states first argument should be the script name itself,
     current execv{p,e} implementation allows it.  */
  char *argv00[] = { NULL };
  run_script ("script0.sh", argv00);

  char *argv01[] = { (char*) "script0.sh", NULL };
  run_script ("script0.sh", argv01);

  char *argv1[] = { (char *) "script1.sh", (char *) "1", NULL };
  run_script ("script1.sh", argv1);

  char *argv2[] = { (char *) "script2.sh", (char *) "2", NULL };
  run_script ("script2.sh", argv2);

  /* Same as before but with execlp.  */
  for (size_t i = 0; i < 5; i++)
    {
      pid_t pid = vfork ();
      if (pid < 0)
	{
	  printf ("vfork failed: %m\n");
	  return 1;
	}
      else if (pid == 0)
	{
	  execlp ("script2.sh", "script2.sh", "3", NULL);
	  _exit (errno);
	}
      int status;
      if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
	{
	  puts ("waitpid failed");
	  return 1;
	}
      else if (status != 0)
	{
	  printf ("script2.sh failed with status %d\n", status);
	  return 1;
	}
    }

  unsetenv ("PATH");
  char *argv4[] = { (char *) "echo", (char *) "script 4", NULL };
  run_script ("echo", argv4);

  return 0;
}

static void
create_script (const char *script, const char *contents, size_t size)
{
  int fd = open (script, O_WRONLY | O_CREAT, 0700);
  if (fd < 0
      || TEMP_FAILURE_RETRY (write (fd, contents, size)) != size
      || fchmod (fd, S_IRUSR | S_IXUSR) < 0)
    FAIL_EXIT1 ("could not write %s\n", script);
  close (fd);
}

static void
do_prepare (void)
{
  size_t len = strlen (test_dir) + sizeof ("/tst-vfork3.XXXXXX");
  tmpdirname = malloc (len);
  if (tmpdirname == NULL)
    FAIL_EXIT1 ("out of memory");
  strcpy (stpcpy (tmpdirname, test_dir), "/tst-vfork3.XXXXXX");

  tmpdirname = mkdtemp (tmpdirname);
  if (tmpdirname == NULL)
    FAIL_EXIT1 ("could not create temporary directory");

  char script0[len + sizeof "/script0.sh"];
  char script1[len + sizeof "/script1.sh"];
  char script2[len + sizeof "/script2.sh"];

  strcpy (stpcpy (script0, tmpdirname), "/script0.sh");
  strcpy (stpcpy (script1, tmpdirname), "/script1.sh");
  strcpy (stpcpy (script2, tmpdirname), "/script2.sh");

  add_temp_file (tmpdirname);
  add_temp_file (script0);
  add_temp_file (script1);
  add_temp_file (script2);

  const char content0[] = "#!/bin/sh\necho empty\n";
  create_script (script0, content0, sizeof content0);

  const char content1[] = "#!/bin/sh\necho script $1\n";
  create_script (script1, content1, sizeof content1);

  const char content2[] = "echo script $1\n";
  create_script (script2, content2, sizeof content2);
}