tmpfile.c 1.7 KB

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  1. /* Copyright (C) 1991, 1993, 1996, 1997, 1998 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Library General Public License as
  5. published by the Free Software Foundation; either version 2 of the
  6. License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Library General Public License for more details.
  11. You should have received a copy of the GNU Library General Public
  12. License along with the GNU C Library; see the file COPYING.LIB. If not,
  13. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  14. Boston, MA 02111-1307, USA. */
  15. #include <features.h>
  16. #include <stdio.h>
  17. #include <unistd.h>
  18. #include "../misc/internals/tempname.h"
  19. /* This returns a new stream opened on a temporary file (generated
  20. by tmpnam). The file is opened with mode "w+b" (binary read/write).
  21. If we couldn't generate a unique filename or the file couldn't
  22. be opened, NULL is returned. */
  23. FILE * tmpfile (void)
  24. {
  25. char buf[FILENAME_MAX];
  26. int fd;
  27. FILE *f;
  28. if (__path_search (buf, FILENAME_MAX, NULL, "tmpf", 0))
  29. return NULL;
  30. fd = __gen_tempname (buf, __GT_FILE);
  31. if (fd < 0)
  32. return NULL;
  33. /* Note that this relies on the Unix semantics that
  34. a file is not really removed until it is closed. */
  35. (void) remove (buf);
  36. if ((f = fdopen (fd, "w+b")) == NULL)
  37. close (fd);
  38. return f;
  39. }
  40. #ifdef __UCLIBC_HAVE_LFS__
  41. weak_alias(tmpfile, tmpfile64);
  42. #endif