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. see <http://www.gnu.org/licenses/>. */
  14. #include <features.h>
  15. #include <stdio.h>
  16. #include <sys/stat.h>
  17. #include <unistd.h>
  18. #include "../misc/internals/tempname.h"
  19. #include <not-cancel.h>
  20. /* This returns a new stream opened on a temporary file (generated
  21. by tmpnam). The file is opened with mode "w+b" (binary read/write).
  22. If we couldn't generate a unique filename or the file couldn't
  23. be opened, NULL is returned. */
  24. FILE * tmpfile (void)
  25. {
  26. char buf[FILENAME_MAX];
  27. int fd;
  28. FILE *f;
  29. if (__path_search (buf, FILENAME_MAX, NULL, "tmpf", 0))
  30. return NULL;
  31. fd = __gen_tempname (buf, __GT_FILE, 0, S_IRUSR | S_IWUSR);
  32. if (fd < 0)
  33. return NULL;
  34. /* Note that this relies on the Unix semantics that
  35. a file is not really removed until it is closed. */
  36. (void) remove (buf);
  37. if ((f = fdopen (fd, "w+b")) == NULL)
  38. close_not_cancel (fd);
  39. return f;
  40. }
  41. #ifdef __UCLIBC_HAS_LFS__
  42. strong_alias(tmpfile,tmpfile64)
  43. #endif