pwent.c 2.2 KB

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  1. /*
  2. * pwent.c - This file is part of the libc-8086/pwd package for ELKS,
  3. * Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
  4. *
  5. * This library is free software; you can redistribute it and/or
  6. * modify it under the terms of the GNU Library General Public
  7. * License as published by the Free Software Foundation; either
  8. * version 2 of the License, or (at your option) any later version.
  9. *
  10. * This 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. * Library General Public License for more details.
  14. *
  15. * You should have received a copy of the GNU Library General Public
  16. * License along with this library; if not, write to the Free
  17. * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18. *
  19. */
  20. #include <features.h>
  21. #include <unistd.h>
  22. #include <stdlib.h>
  23. #include <errno.h>
  24. #include <fcntl.h>
  25. #include <paths.h>
  26. #include "config.h"
  27. #ifdef __UCLIBC_HAS_THREADS__
  28. #include <pthread.h>
  29. static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
  30. # define LOCK pthread_mutex_lock(&mylock)
  31. # define UNLOCK pthread_mutex_unlock(&mylock);
  32. #else
  33. # define LOCK
  34. # define UNLOCK
  35. #endif
  36. /*
  37. * setpwent(), endpwent(), and getpwent() are included in the same object
  38. * file, since one cannot be used without the other two, so it makes sense to
  39. * link them all in together.
  40. */
  41. /* file descriptor for the password file currently open */
  42. static int pw_fd = -1;
  43. void setpwent(void)
  44. {
  45. LOCK;
  46. if (pw_fd != -1)
  47. close(pw_fd);
  48. pw_fd = open(_PATH_PASSWD, O_RDONLY);
  49. UNLOCK;
  50. }
  51. void endpwent(void)
  52. {
  53. LOCK;
  54. if (pw_fd != -1)
  55. close(pw_fd);
  56. pw_fd = -1;
  57. UNLOCK;
  58. }
  59. int getpwent_r (struct passwd *password, char *buff,
  60. size_t buflen, struct passwd **crap)
  61. {
  62. LOCK;
  63. if (pw_fd != -1 && __getpwent_r(password, buff, buflen, pw_fd) != -1) {
  64. UNLOCK;
  65. return 0;
  66. }
  67. UNLOCK;
  68. return -1;
  69. }
  70. struct passwd *getpwent(void)
  71. {
  72. static char line_buff[PWD_BUFFER_SIZE];
  73. static struct passwd pwd;
  74. LOCK;
  75. if (getpwent_r(&pwd, line_buff, sizeof(line_buff), NULL) != -1) {
  76. UNLOCK;
  77. return &pwd;
  78. }
  79. UNLOCK;
  80. return NULL;
  81. }