logwtmp.c 1.8 KB

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  1. /* wtmp support rubbish (i.e. complete crap)
  2. *
  3. * Written by Erik Andersen <andersee@debian.org>
  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 License as
  7. * published by the Free Software Foundation; either version 2 of the
  8. * 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; see the file COPYING.LIB. If not,
  17. * write to the Free Software Foundation, Inc., 675 Mass Ave,
  18. * Cambridge, MA 02139, USA. */
  19. #include <string.h>
  20. #include <sys/time.h>
  21. #include <time.h>
  22. #include <unistd.h>
  23. #include <utmp.h>
  24. #include <fcntl.h>
  25. #include <sys/file.h>
  26. void logwtmp (const char *line, const char *name, const char *host)
  27. {
  28. struct utmp lutmp;
  29. memset (&(lutmp), 0, sizeof (struct utmp));
  30. lutmp.ut_type = (name && *name)? USER_PROCESS : DEAD_PROCESS;
  31. lutmp.ut_pid = getpid();
  32. strncpy(lutmp.ut_line, line, sizeof(lutmp.ut_line)-1);
  33. strncpy(lutmp.ut_name, name, sizeof(lutmp.ut_name)-1);
  34. strncpy(lutmp.ut_host, host, sizeof(lutmp.ut_host)-1);
  35. __libc_gettimeofday(&(lutmp.ut_tv), NULL);
  36. updwtmp(_PATH_WTMP, &(lutmp));
  37. }
  38. #if 0
  39. /* This is enabled in uClibc/libc/misc/utmp/wtent.c */
  40. extern void updwtmp(const char *wtmp_file, const struct utmp *lutmp)
  41. {
  42. int fd;
  43. fd = open(wtmp_file, O_APPEND | O_WRONLY, 0);
  44. if (fd >= 0) {
  45. if (lockf(fd, F_LOCK, 0)==0) {
  46. write(fd, (const char *) lutmp, sizeof(struct utmp));
  47. lockf(fd, F_ULOCK, 0);
  48. close(fd);
  49. }
  50. }
  51. }
  52. #endif