1#serial 23
2
3# Copyright (C) 2001, 2003-2007, 2009-2014 Free Software Foundation, Inc.
4# This file is free software; the Free Software Foundation
5# gives unlimited permission to copy and/or distribute it,
6# with or without modifications, as long as this notice is preserved.
7
8# On some hosts (e.g., HP-UX 10.20, SunOS 4.1.4, Solaris 2.5.1), mkstemp has a
9# silly limit that it can create no more than 26 files from a given template.
10# Other systems lack mkstemp altogether.
11# On OSF1/Tru64 V4.0F, the system-provided mkstemp function can create
12# only 32 files per process.
13# On some hosts, mkstemp creates files with mode 0666, which is a security
14# problem and a violation of POSIX 2008.
15# On systems like the above, arrange to use the replacement function.
16AC_DEFUN([gl_FUNC_MKSTEMP],
17[
18  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
19  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
20
21  AC_CHECK_FUNCS_ONCE([mkstemp])
22  if test $ac_cv_func_mkstemp = yes; then
23    AC_CACHE_CHECK([for working mkstemp],
24      [gl_cv_func_working_mkstemp],
25      [
26        mkdir conftest.mkstemp
27        AC_RUN_IFELSE(
28          [AC_LANG_PROGRAM(
29            [AC_INCLUDES_DEFAULT],
30            [[int result = 0;
31              int i;
32              off_t large = (off_t) 4294967295u;
33              if (large < 0)
34                large = 2147483647;
35              umask (0);
36              for (i = 0; i < 70; i++)
37                {
38                  char templ[] = "conftest.mkstemp/coXXXXXX";
39                  int (*mkstemp_function) (char *) = mkstemp;
40                  int fd = mkstemp_function (templ);
41                  if (fd < 0)
42                    result |= 1;
43                  else
44                    {
45                      struct stat st;
46                      if (lseek (fd, large, SEEK_SET) != large)
47                        result |= 2;
48                      if (fstat (fd, &st) < 0)
49                        result |= 4;
50                      else if (st.st_mode & 0077)
51                        result |= 8;
52                      if (close (fd))
53                        result |= 16;
54                    }
55                }
56              return result;]])],
57          [gl_cv_func_working_mkstemp=yes],
58          [gl_cv_func_working_mkstemp=no],
59          [case "$host_os" in
60                     # Guess yes on glibc systems.
61             *-gnu*) gl_cv_func_working_mkstemp="guessing yes" ;;
62                     # If we don't know, assume the worst.
63             *)      gl_cv_func_working_mkstemp="guessing no" ;;
64           esac
65          ])
66        rm -rf conftest.mkstemp
67      ])
68    case "$gl_cv_func_working_mkstemp" in
69      *yes) ;;
70      *)
71        REPLACE_MKSTEMP=1
72        ;;
73    esac
74  else
75    HAVE_MKSTEMP=0
76  fi
77])
78
79# Prerequisites of lib/mkstemp.c.
80AC_DEFUN([gl_PREREQ_MKSTEMP],
81[
82])
83