posix/tst-vfork3.c

   1 /* Test for vfork functions.
   2    Copyright (C) 2007-2020 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Jakub Jelinek <jakub@redhat.com>, 2007.
   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, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <mcheck.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/stat.h>
  27 #include <sys/wait.h>
  28
  29 static int do_test (void);
  30 static void do_prepare (void);
  31 char *tmpdirname;
  32
  33 #define TEST_FUNCTION do_test ()
  34 #define PREPARE(argc, argv) do_prepare ()
  35 #include "../test-skeleton.c"
  36
  37 static void
  38 run_script (const char *script, char *const argv[])
  39 {
  40   for (size_t i = 0; i < 5; i++)
  41     {
  42       pid_t pid = vfork ();
  43       if (pid < 0)
  44         FAIL_EXIT1 ("vfork failed: %m");
  45       else if (pid == 0)
  46         {
  47           execvp (script, argv);
  48           _exit (errno);
  49         }
  50
  51       int status;
  52       if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
  53         FAIL_EXIT1 ("waitpid failed");
  54       else if (status != 0)
  55         {
  56           if (WIFEXITED (status))
  57             FAIL_EXIT1 ("%s failed with status %d\n", script,
  58                         WEXITSTATUS (status));
  59           else
  60             FAIL_EXIT1 ("%s killed by signal %d\n", script,
  61                         WTERMSIG (status));
  62         }
  63     }
  64 }
  65
  66 static int
  67 do_test (void)
  68 {
  69   mtrace ();
  70
  71   const char *path = getenv ("PATH");
  72   if (path == NULL)
  73     path = "/bin";
  74   char pathbuf[strlen (tmpdirname) + 1 + strlen (path) + 1];
  75   strcpy (stpcpy (stpcpy (pathbuf, tmpdirname), ":"), path);
  76   if (setenv ("PATH", pathbuf, 1) < 0)
  77     {
  78       puts ("setenv failed");
  79       return 1;
  80     }
  81
  82   /* Although manual states first argument should be the script name itself,
  83      current execv{p,e} implementation allows it.  */
  84   char *argv00[] = { NULL };
  85   run_script ("script0.sh", argv00);
  86
  87   char *argv01[] = { (char*) "script0.sh", NULL };
  88   run_script ("script0.sh", argv01);
  89
  90   char *argv1[] = { (char *) "script1.sh", (char *) "1", NULL };
  91   run_script ("script1.sh", argv1);
  92
  93   char *argv2[] = { (char *) "script2.sh", (char *) "2", NULL };
  94   run_script ("script2.sh", argv2);
  95
  96   /* Same as before but with execlp.  */
  97   for (size_t i = 0; i < 5; i++)
  98     {
  99       pid_t pid = vfork ();
 100       if (pid < 0)
 101         {
 102           printf ("vfork failed: %m\n");
 103           return 1;
 104         }
 105       else if (pid == 0)
 106         {
 107           execlp ("script2.sh", "script2.sh", "3", NULL);
 108           _exit (errno);
 109         }
 110       int status;
 111       if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
 112         {
 113           puts ("waitpid failed");
 114           return 1;
 115         }
 116       else if (status != 0)
 117         {
 118           printf ("script2.sh failed with status %d\n", status);
 119           return 1;
 120         }
 121     }
 122
 123   unsetenv ("PATH");
 124   char *argv4[] = { (char *) "echo", (char *) "script 4", NULL };
 125   run_script ("echo", argv4);
 126
 127   return 0;
 128 }
 129
 130 static void
 131 create_script (const char *script, const char *contents, size_t size)
 132 {
 133   int fd = open (script, O_WRONLY | O_CREAT, 0700);
 134   if (fd < 0
 135       || TEMP_FAILURE_RETRY (write (fd, contents, size)) != size
 136       || fchmod (fd, S_IRUSR | S_IXUSR) < 0)
 137     FAIL_EXIT1 ("could not write %s\n", script);
 138   close (fd);
 139 }
 140
 141 static void
 142 do_prepare (void)
 143 {
 144   size_t len = strlen (test_dir) + sizeof ("/tst-vfork3.XXXXXX");
 145   tmpdirname = malloc (len);
 146   if (tmpdirname == NULL)
 147     FAIL_EXIT1 ("out of memory");
 148   strcpy (stpcpy (tmpdirname, test_dir), "/tst-vfork3.XXXXXX");
 149
 150   tmpdirname = mkdtemp (tmpdirname);
 151   if (tmpdirname == NULL)
 152     FAIL_EXIT1 ("could not create temporary directory");
 153
 154   char script0[len + sizeof "/script0.sh"];
 155   char script1[len + sizeof "/script1.sh"];
 156   char script2[len + sizeof "/script2.sh"];
 157
 158   strcpy (stpcpy (script0, tmpdirname), "/script0.sh");
 159   strcpy (stpcpy (script1, tmpdirname), "/script1.sh");
 160   strcpy (stpcpy (script2, tmpdirname), "/script2.sh");
 161
 162   add_temp_file (tmpdirname);
 163   add_temp_file (script0);
 164   add_temp_file (script1);
 165   add_temp_file (script2);
 166
 167   const char content0[] = "#!/bin/sh\necho empty\n";
 168   create_script (script0, content0, sizeof content0);
 169
 170   const char content1[] = "#!/bin/sh\necho script $1\n";
 171   create_script (script1, content1, sizeof content1);
 172
 173   const char content2[] = "echo script $1\n";
 174   create_script (script2, content2, sizeof content2);
 175 }