login_tty.c 2.3 KB

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  1. /*-
  2. * Copyright (c) 1990, 1993
  3. * The Regents of the University of California. All rights reserved.
  4. *
  5. * Redistribution and use in source and binary forms, with or without
  6. * modification, are permitted provided that the following conditions
  7. * are met:
  8. * 1. Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * 2. Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in the
  12. * documentation and/or other materials provided with the distribution.
  13. * 4. Neither the name of the University nor the names of its contributors
  14. * may be used to endorse or promote products derived from this software
  15. * without specific prior written permission.
  16. *
  17. * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20. * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27. * SUCH DAMAGE.
  28. */
  29. /* Make FD be the controlling terminal, stdin, stdout, and stderr;
  30. then close FD. Returns 0 on success, nonzero on error. */
  31. #include <sys/param.h>
  32. #include <sys/ioctl.h>
  33. #include <unistd.h>
  34. #include <fcntl.h>
  35. #include <utmp.h>
  36. int login_tty(int fd)
  37. {
  38. (void) setsid();
  39. #ifdef TIOCSCTTY
  40. if (ioctl(fd, TIOCSCTTY, (char *)NULL) == -1)
  41. return (-1);
  42. #else
  43. {
  44. /* This might work. */
  45. char *fdname = ttyname (fd);
  46. int newfd;
  47. if (fdname)
  48. {
  49. if (fd != 0)
  50. (void) close (0);
  51. if (fd != 1)
  52. (void) close (1);
  53. if (fd != 2)
  54. (void) close (2);
  55. newfd = open (fdname, O_RDWR);
  56. (void) close (newfd);
  57. }
  58. }
  59. #endif
  60. (void) dup2(fd, 0);
  61. (void) dup2(fd, 1);
  62. (void) dup2(fd, 2);
  63. if (fd > 2)
  64. (void) close(fd);
  65. return (0);
  66. }