posix/tst-vfork3.c

   1 /* Test for vfork functions.
   2    Copyright (C) 2007-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <mcheck.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <sys/stat.h>
  26 #include <sys/wait.h>
  27
  28 static int do_test (void);
  29 static void do_prepare (void);
  30 char *tmpdirname;
  31
  32 #define TEST_FUNCTION do_test ()
  33 #define PREPARE(argc, argv) do_prepare ()
  34 #include "../test-skeleton.c"
  35
  36 static void
  37 run_script (const char *script, char *const argv[])
  38 {
  39   for (size_t i = 0; i < 5; i++)
  40     {
  41       pid_t pid = vfork ();
  42       if (pid < 0)
  43         FAIL_EXIT1 ("vfork failed: %m");
  44       else if (pid == 0)
  45         {
  46           execvp (script, argv);
  47           _exit (errno);
  48         }
  49
  50       int status;
  51       if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
  52         FAIL_EXIT1 ("waitpid failed");
  53       else if (status != 0)
  54         {
  55           if (WIFEXITED (status))
  56             FAIL_EXIT1 ("%s failed with status %d\n", script,
  57                         WEXITSTATUS (status));
  58           else
  59             FAIL_EXIT1 ("%s killed by signal %d\n", script,
  60                         WTERMSIG (status));
  61         }
  62     }
  63 }
  64
  65 static int
  66 do_test (void)
  67 {
  68   mtrace ();
  69
  70   const char *path = getenv ("PATH");
  71   if (path == NULL)
  72     path = "/bin";
  73   char pathbuf[strlen (tmpdirname) + 1 + strlen (path) + 1];
  74   strcpy (stpcpy (stpcpy (pathbuf, tmpdirname), ":"), path);
  75   if (setenv ("PATH", pathbuf, 1) < 0)
  76     {
  77       puts ("setenv failed");
  78       return 1;
  79     }
  80
  81   /* Although manual states first argument should be the script name itself,
  82      current execv{p,e} implementation allows it.  */
  83   char *argv00[] = { NULL };
  84   run_script ("script0.sh", argv00);
  85
  86   char *argv01[] = { (char*) "script0.sh", NULL };
  87   run_script ("script0.sh", argv01);
  88
  89   char *argv1[] = { (char *) "script1.sh", (char *) "1", NULL };
  90   run_script ("script1.sh", argv1);
  91
  92   char *argv2[] = { (char *) "script2.sh", (char *) "2", NULL };
  93   run_script ("script2.sh", argv2);
  94
  95   /* Same as before but with execlp.  */
  96   for (size_t i = 0; i < 5; i++)
  97     {
  98       pid_t pid = vfork ();
  99       if (pid < 0)
 100         {
 101           printf ("vfork failed: %m\n");
 102           return 1;
 103         }
 104       else if (pid == 0)
 105         {
 106           execlp ("script2.sh", "script2.sh", "3", NULL);
 107           _exit (errno);
 108         }
 109       int status;
 110       if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
 111         {
 112           puts ("waitpid failed");
 113           return 1;
 114         }
 115       else if (status != 0)
 116         {
 117           printf ("script2.sh failed with status %d\n", status);
 118           return 1;
 119         }
 120     }
 121
 122   unsetenv ("PATH");
 123   char *argv4[] = { (char *) "echo", (char *) "script 4", NULL };
 124   run_script ("echo", argv4);
 125
 126   return 0;
 127 }
 128
 129 static void
 130 create_script (const char *script, const char *contents, size_t size)
 131 {
 132   int fd = open (script, O_WRONLY | O_CREAT, 0700);
 133   if (fd < 0
 134       || TEMP_FAILURE_RETRY (write (fd, contents, size)) != size
 135       || fchmod (fd, S_IRUSR | S_IXUSR) < 0)
 136     FAIL_EXIT1 ("could not write %s\n", script);
 137   close (fd);
 138 }
 139
 140 static void
 141 do_prepare (void)
 142 {
 143   size_t len = strlen (test_dir) + sizeof ("/tst-vfork3.XXXXXX");
 144   tmpdirname = malloc (len);
 145   if (tmpdirname == NULL)
 146     FAIL_EXIT1 ("out of memory");
 147   strcpy (stpcpy (tmpdirname, test_dir), "/tst-vfork3.XXXXXX");
 148
 149   tmpdirname = mkdtemp (tmpdirname);
 150   if (tmpdirname == NULL)
 151     FAIL_EXIT1 ("could not create temporary directory");
 152
 153   char script0[len + sizeof "/script0.sh"];
 154   char script1[len + sizeof "/script1.sh"];
 155   char script2[len + sizeof "/script2.sh"];
 156
 157   strcpy (stpcpy (script0, tmpdirname), "/script0.sh");
 158   strcpy (stpcpy (script1, tmpdirname), "/script1.sh");
 159   strcpy (stpcpy (script2, tmpdirname), "/script2.sh");
 160
 161   add_temp_file (tmpdirname);
 162   add_temp_file (script0);
 163   add_temp_file (script1);
 164   add_temp_file (script2);
 165
 166   const char content0[] = "#!/bin/sh\necho empty\n";
 167   create_script (script0, content0, sizeof content0);
 168
 169   const char content1[] = "#!/bin/sh\necho script $1\n";
 170   create_script (script1, content1, sizeof content1);
 171
 172   const char content2[] = "echo script $1\n";
 173   create_script (script2, content2, sizeof content2);
 174 }