posix/tst-exec.c

   1 /* Tests for exec.
   2    Copyright (C) 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <errno.h>
  22 #include <error.h>
  23 #include <fcntl.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <wait.h>
  28
  29
  30 /* Nonzero if the program gets called via `exec'.  */
  31 static int restart;
  32
  33
  34 #define CMDLINE_OPTIONS \
  35   { "restart", no_argument, &restart, 1 },
  36
  37 /* Prototype for our test function.  */
  38 extern void do_prepare (int argc, char *argv[]);
  39 extern int do_test (int argc, char *argv[]);
  40
  41 /* We have a preparation function.  */
  42 #define PREPARE do_prepare
  43
  44 #include "../test-skeleton.c"
  45
  46
  47 /* Name of the temporary files.  */
  48 static char *name1;
  49 static char *name2;
  50
  51 /* The contents of our files.  */
  52 static const char fd1string[] = "This file should get closed";
  53 static const char fd2string[] = "This file should stay opened";
  54
  55
  56 /* We have a preparation function.  */
  57 void
  58 do_prepare (int argc, char *argv[])
  59 {
  60    size_t name_len;
  61
  62    name_len = strlen (test_dir);
  63    name1 = malloc (name_len + sizeof ("/execXXXXXX"));
  64    mempcpy (mempcpy (name1, test_dir, name_len),
  65             "/execXXXXXX", sizeof ("/execXXXXXX"));
  66    add_temp_file (name1);
  67
  68    name2 = malloc (name_len + sizeof ("/execXXXXXX"));
  69    mempcpy (mempcpy (name2, test_dir, name_len),
  70             "/execXXXXXX", sizeof ("/execXXXXXX"));
  71    add_temp_file (name2);
  72 }
  73
  74
  75 static int
  76 handle_restart (const char *fd1s, const char *fd2s, const char *name)
  77 {
  78   char buf[100];
  79   int fd1;
  80   int fd2;
  81
  82   /* First get the descriptors.  */
  83   fd1 = atol (fd1s);
  84   fd2 = atol (fd2s);
  85
  86   /* Sanity check.  */
  87   if (fd1 == fd2)
  88     error (EXIT_FAILURE, 0, "value of fd1 and fd2 is the same");
  89
  90   /* First the easy part: read from the file descriptor which is
  91      supposed to be open.  */
  92   if (lseek (fd2, 0, SEEK_CUR) != strlen (fd2string))
  93     error (EXIT_FAILURE, errno, "file 2 not in right position");
  94   if (lseek (fd2, 0, SEEK_SET) != 0)
  95     error (EXIT_FAILURE, 0, "cannot reset position in file 2");
  96   if (read (fd2, buf, sizeof buf) != strlen (fd2string))
  97     error (EXIT_FAILURE, 0, "cannot read file 2");
  98   if (memcmp (fd2string, buf, strlen (fd2string)) != 0)
  99     error (EXIT_FAILURE, 0, "file 2 does not match");
 100
 101   /* No try to read the first file.  First make sure it is not opened.  */
 102   if (lseek (fd1, 0, SEEK_CUR) != (off_t) -1 || errno != EBADF)
 103     error (EXIT_FAILURE, 0, "file 1 (%d) is not closed", fd1);
 104
 105   /* Now open the file and read it.  */
 106   fd1 = open (name, O_RDONLY);
 107   if (fd1 == -1)
 108     error (EXIT_FAILURE, errno,
 109            "cannot open first file \"%s\" for verification", name);
 110
 111   if (read (fd1, buf, sizeof buf) != strlen (fd1string))
 112     error (EXIT_FAILURE, errno, "cannot read file 1");
 113   if (memcmp (fd1string, buf, strlen (fd1string)) != 0)
 114     error (EXIT_FAILURE, 0, "file 1 does not match");
 115
 116   return 0;
 117 }
 118
 119
 120 int
 121 do_test (int argc, char *argv[])
 122 {
 123   pid_t pid;
 124   int fd1;
 125   int fd2;
 126   int flags;
 127   int status;
 128
 129   /* We must have
 130      - four parameters left of called initially
 131        + path for ld.so
 132        + "--library-path"
 133        + the library path
 134        + the application name
 135      - three parameters left if called through re-execution
 136        + file descriptor number which is supposed to be closed
 137        + the open file descriptor
 138        + the name of the closed desriptor
 139   */
 140
 141   if (restart)
 142     {
 143       if (argc != 4)
 144         error (EXIT_FAILURE, 0, "wrong number of arguments (%d)", argc);
 145
 146       return handle_restart (argv[1], argv[2], argv[3]);
 147     }
 148
 149   if (argc != 5)
 150     error (EXIT_FAILURE, 0, "wrong number of arguments (%d)", argc);
 151
 152   /* Prepare the test.  We are creating two files: one which file descriptor
 153      will be marked with FD_CLOEXEC, another which is not.  */
 154
 155    /* Open our test files.   */
 156    fd1 = mkstemp (name1);
 157    if (fd1 == -1)
 158      error (EXIT_FAILURE, errno, "cannot open test file `%s'", name1);
 159    fd2 = mkstemp (name2);
 160    if (fd2 == -1)
 161      error (EXIT_FAILURE, errno, "cannot open test file `%s'", name2);
 162
 163    /* Set the bit.  */
 164    flags = fcntl (fd1, F_GETFD, 0);
 165    if (flags < 0)
 166      error (EXIT_FAILURE, errno, "cannot get flags");
 167    flags |= FD_CLOEXEC;
 168    if (fcntl (fd1, F_SETFD, flags) < 0)
 169      error (EXIT_FAILURE, errno, "cannot set flags");
 170
 171    /* Write something in the files.  */
 172    if (write (fd1, fd1string, strlen (fd1string)) != strlen (fd1string))
 173      error (EXIT_FAILURE, errno, "cannot write to first file");
 174    if (write (fd2, fd2string, strlen (fd2string)) != strlen (fd2string))
 175      error (EXIT_FAILURE, errno, "cannot write to second file");
 176
 177   /* We want to test the `exec' function.  To do this we restart the program
 178      with an additional parameter.  But first create another process.  */
 179   pid = fork ();
 180   if (pid == 0)
 181     {
 182       char fd1name[18];
 183       char fd2name[18];
 184
 185       snprintf (fd1name, sizeof fd1name, "%d", fd1);
 186       snprintf (fd2name, sizeof fd2name, "%d", fd2);
 187
 188       /* This is the child.  Construct the command line.  */
 189       execl (argv[1], argv[1], argv[2], argv[3], argv[4], "--direct",
 190              "--restart", fd1name, fd2name, name1, NULL);
 191
 192       error (EXIT_FAILURE, errno, "cannot exec");
 193     }
 194   else if (pid == (pid_t) -1)
 195     error (EXIT_FAILURE, errno, "cannot fork");
 196
 197   /* Wait for the child.  */
 198   if (waitpid (pid, &status, 0) != pid)
 199     error (EXIT_FAILURE, errno, "wrong child");
 200
 201   if (WTERMSIG (status) != 0)
 202     error (EXIT_FAILURE, 0, "Child terminated incorrectly");
 203   status = WEXITSTATUS (status);
 204
 205   /* Remove the test files.  */
 206   unlink (name1);
 207   unlink (name2);
 208
 209   return status;
 210 }