lib/tempname.h

   1 /* Create a temporary file or directory.
   2
   3    Copyright (C) 2006, 2009-2018 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* header written by Eric Blake */
  19
  20 #ifndef GL_TEMPNAME_H
  21 # define GL_TEMPNAME_H
  22
  23 # include <stdio.h>
  24
  25 # ifdef __GT_FILE
  26 #  define GT_FILE     __GT_FILE
  27 #  define GT_DIR      __GT_DIR
  28 #  define GT_NOCREATE __GT_NOCREATE
  29 # else
  30 #  define GT_FILE     0
  31 #  define GT_DIR      1
  32 #  define GT_NOCREATE 2
  33 # endif
  34
  35 #ifdef __cplusplus
  36 extern "C" {
  37 #endif
  38
  39 /* Generate a temporary file name based on TMPL.  TMPL must match the
  40    rules for mk[s]temp (i.e. end in "XXXXXX", possibly with a suffix).
  41    The name constructed does not exist at the time of the call to
  42    gen_tempname.  TMPL is overwritten with the result.
  43
  44    KIND may be one of:
  45    GT_NOCREATE:         simply verify that the name does not exist
  46                         at the time of the call.
  47    GT_FILE:             create a large file using open(O_CREAT|O_EXCL)
  48                         and return a read-write fd.  The file is mode 0600.
  49    GT_DIR:              create a directory, which will be mode 0700.
  50
  51    We use a clever algorithm to get hard-to-predict names. */
  52 extern int gen_tempname (char *tmpl, int suffixlen, int flags, int kind);
  53
  54 /* Similar to gen_tempname, but TRYFUNC is called for each temporary
  55    name to try.  If TRYFUNC returns a non-negative number, TRY_GEN_TEMPNAME
  56    returns with this value.  Otherwise, if errno is set to EEXIST, another
  57    name is tried, or else TRY_GEN_TEMPNAME returns -1. */
  58 extern int try_tempname (char *tmpl, int suffixlen, void *args,
  59                          int (*tryfunc) (char *, void *));
  60
  61 #ifdef __cplusplus
  62 }
  63 #endif
  64
  65 #endif /* GL_TEMPNAME_H */