tst-fork2.c 2.1 KB

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  1. /* Copyright (C) 2002 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Roland McGrath <roland@redhat.com>, 2002.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #include <errno.h>
  17. #include <pthread.h>
  18. #include <stdio.h>
  19. #include <stdlib.h>
  20. #include <unistd.h>
  21. #include <sys/wait.h>
  22. static pid_t initial_pid;
  23. static void *
  24. tf (void *arg)
  25. {
  26. if (getppid () != initial_pid)
  27. {
  28. printf ("getppid in thread returned %ld, expected %ld\n",
  29. (long int) getppid (), (long int) initial_pid);
  30. return (void *) -1;
  31. }
  32. return NULL;
  33. }
  34. int
  35. main (void)
  36. {
  37. initial_pid = getpid ();
  38. pid_t child = fork ();
  39. if (child == 0)
  40. {
  41. if (getppid () != initial_pid)
  42. {
  43. printf ("first getppid returned %ld, expected %ld\n",
  44. (long int) getppid (), (long int) initial_pid);
  45. exit (1);
  46. }
  47. pthread_t th;
  48. if (pthread_create (&th, NULL, tf, NULL) != 0)
  49. {
  50. puts ("pthread_create failed");
  51. exit (1);
  52. }
  53. void *result;
  54. if (pthread_join (th, &result) != 0)
  55. {
  56. puts ("pthread_join failed");
  57. exit (1);
  58. }
  59. exit (result == NULL ? 0 : 1);
  60. }
  61. else if (child == -1)
  62. {
  63. puts ("initial fork failed");
  64. return 1;
  65. }
  66. int status;
  67. if (TEMP_FAILURE_RETRY (waitpid (child, &status, 0)) != child)
  68. {
  69. printf ("waitpid failed: %m\n");
  70. return 1;
  71. }
  72. return status;
  73. }