summary refs log tree commit diff
path: root/posix/tst-exec.c
blob: be0114e1f91eb71b0fe94ca8e42e3093cbdf6e53 (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
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
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
/* Tests for exec.
   Copyright (C) 2000-2017 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.

   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 <error.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wait.h>


/* Nonzero if the program gets called via `exec'.  */
static int restart;


#define CMDLINE_OPTIONS \
  { "restart", no_argument, &restart, 1 },

/* Prototype for our test function.  */
extern void do_prepare (int argc, char *argv[]);
extern int do_test (int argc, char *argv[]);

/* We have a preparation function.  */
#define PREPARE do_prepare

#include "../test-skeleton.c"


/* Name of the temporary files.  */
static char *name1;
static char *name2;

/* The contents of our files.  */
static const char fd1string[] = "This file should get closed";
static const char fd2string[] = "This file should stay opened";


/* We have a preparation function.  */
void
do_prepare (int argc, char *argv[])
{
   size_t name_len;

   name_len = strlen (test_dir);
   name1 = xmalloc (name_len + sizeof ("/execXXXXXX"));
   mempcpy (mempcpy (name1, test_dir, name_len),
	    "/execXXXXXX", sizeof ("/execXXXXXX"));
   add_temp_file (name1);

   name2 = xmalloc (name_len + sizeof ("/execXXXXXX"));
   mempcpy (mempcpy (name2, test_dir, name_len),
	    "/execXXXXXX", sizeof ("/execXXXXXX"));
   add_temp_file (name2);
}


static int
handle_restart (const char *fd1s, const char *fd2s, const char *name)
{
  char buf[100];
  int fd1;
  int fd2;

  /* First get the descriptors.  */
  fd1 = atol (fd1s);
  fd2 = atol (fd2s);

  /* Sanity check.  */
  if (fd1 == fd2)
    error (EXIT_FAILURE, 0, "value of fd1 and fd2 is the same");

  /* First the easy part: read from the file descriptor which is
     supposed to be open.  */
  if (lseek (fd2, 0, SEEK_CUR) != strlen (fd2string))
    error (EXIT_FAILURE, errno, "file 2 not in right position");
  if (lseek (fd2, 0, SEEK_SET) != 0)
    error (EXIT_FAILURE, 0, "cannot reset position in file 2");
  if (read (fd2, buf, sizeof buf) != strlen (fd2string))
    error (EXIT_FAILURE, 0, "cannot read file 2");
  if (memcmp (fd2string, buf, strlen (fd2string)) != 0)
    error (EXIT_FAILURE, 0, "file 2 does not match");

  /* No try to read the first file.  First make sure it is not opened.  */
  if (lseek (fd1, 0, SEEK_CUR) != (off_t) -1 || errno != EBADF)
    error (EXIT_FAILURE, 0, "file 1 (%d) is not closed", fd1);

  /* Now open the file and read it.  */
  fd1 = open (name, O_RDONLY);
  if (fd1 == -1)
    error (EXIT_FAILURE, errno,
	   "cannot open first file \"%s\" for verification", name);

  if (read (fd1, buf, sizeof buf) != strlen (fd1string))
    error (EXIT_FAILURE, errno, "cannot read file 1");
  if (memcmp (fd1string, buf, strlen (fd1string)) != 0)
    error (EXIT_FAILURE, 0, "file 1 does not match");

  return 0;
}


int
do_test (int argc, char *argv[])
{
  pid_t pid;
  int fd1;
  int fd2;
  int flags;
  int status;

  /* We must have
     - one or four parameters left if called initially
       + path for ld.so		optional
       + "--library-path"	optional
       + the library path	optional
       + the application name
     - three parameters left if called through re-execution
       + file descriptor number which is supposed to be closed
       + the open file descriptor
       + the name of the closed desriptor
  */

  if (restart)
    {
      if (argc != 4)
	error (EXIT_FAILURE, 0, "wrong number of arguments (%d)", argc);

      return handle_restart (argv[1], argv[2], argv[3]);
    }

  if (argc != 2 && argc != 5)
    error (EXIT_FAILURE, 0, "wrong number of arguments (%d)", argc);

  /* Prepare the test.  We are creating two files: one which file descriptor
     will be marked with FD_CLOEXEC, another which is not.  */

   /* Open our test files.   */
   fd1 = mkstemp (name1);
   if (fd1 == -1)
     error (EXIT_FAILURE, errno, "cannot open test file `%s'", name1);
   fd2 = mkstemp (name2);
   if (fd2 == -1)
     error (EXIT_FAILURE, errno, "cannot open test file `%s'", name2);

   /* Set the bit.  */
   flags = fcntl (fd1, F_GETFD, 0);
   if (flags < 0)
     error (EXIT_FAILURE, errno, "cannot get flags");
   flags |= FD_CLOEXEC;
   if (fcntl (fd1, F_SETFD, flags) < 0)
     error (EXIT_FAILURE, errno, "cannot set flags");

   /* Write something in the files.  */
   if (write (fd1, fd1string, strlen (fd1string)) != strlen (fd1string))
     error (EXIT_FAILURE, errno, "cannot write to first file");
   if (write (fd2, fd2string, strlen (fd2string)) != strlen (fd2string))
     error (EXIT_FAILURE, errno, "cannot write to second file");

  /* We want to test the `exec' function.  To do this we restart the program
     with an additional parameter.  But first create another process.  */
  pid = fork ();
  if (pid == 0)
    {
      char fd1name[18];
      char fd2name[18];

      snprintf (fd1name, sizeof fd1name, "%d", fd1);
      snprintf (fd2name, sizeof fd2name, "%d", fd2);

      /* This is the child.  Construct the command line.  */
      if (argc == 5)
	execl (argv[1], argv[1], argv[2], argv[3], argv[4], "--direct",
	       "--restart", fd1name, fd2name, name1, NULL);
      else
	execl (argv[1], argv[1], "--direct",
	       "--restart", fd1name, fd2name, name1, NULL);

      error (EXIT_FAILURE, errno, "cannot exec");
    }
  else if (pid == (pid_t) -1)
    error (EXIT_FAILURE, errno, "cannot fork");

  /* Wait for the child.  */
  if (waitpid (pid, &status, 0) != pid)
    error (EXIT_FAILURE, errno, "wrong child");

  if (WTERMSIG (status) != 0)
    error (EXIT_FAILURE, 0, "Child terminated incorrectly");
  status = WEXITSTATUS (status);

  /* Remove the test files.  */
  unlink (name1);
  unlink (name2);

  return status;
}