tst-fork3.c 2.3 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107
  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. tf2 (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. static void *
  35. tf1 (void *arg)
  36. {
  37. pid_t child = fork ();
  38. if (child == 0)
  39. {
  40. if (getppid () != initial_pid)
  41. {
  42. printf ("first getppid returned %ld, expected %ld\n",
  43. (long int) getppid (), (long int) initial_pid);
  44. exit (1);
  45. }
  46. pthread_t th2;
  47. if (pthread_create (&th2, NULL, tf2, NULL) != 0)
  48. {
  49. puts ("child: pthread_create failed");
  50. exit (1);
  51. }
  52. void *result;
  53. if (pthread_join (th2, &result) != 0)
  54. {
  55. puts ("pthread_join failed");
  56. exit (1);
  57. }
  58. exit (result == NULL ? 0 : 1);
  59. }
  60. else if (child == -1)
  61. {
  62. puts ("initial fork failed");
  63. exit (1);
  64. }
  65. int status;
  66. if (TEMP_FAILURE_RETRY (waitpid (child, &status, 0)) != child)
  67. {
  68. printf ("waitpid failed: %m\n");
  69. exit (1);
  70. }
  71. exit (status);
  72. }
  73. int
  74. main (void)
  75. {
  76. initial_pid = getpid ();
  77. pthread_t th1;
  78. if (pthread_create (&th1, NULL, tf1, NULL) != 0)
  79. {
  80. puts ("parent: pthread_create failed");
  81. exit (1);
  82. }
  83. /* This call should never return. */
  84. pthread_join (th1, NULL);
  85. return 1;
  86. }