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annotate m4/mkstemp.m4 @ 40196:e63f5d3edab5

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relocatable-prog: Update documentation. * doc/relocatable-maint.texi (Supporting Relocation): Update to match the recent changes.
author Bruno Haible <bruno@clisp.org>
date Sun, 24 Feb 2019 01:49:15 +0100
parents b06060465f09
children
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1 #serial 25
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2
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3 # Copyright (C) 2001, 2003-2007, 2009-2019 Free Software Foundation, Inc.
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4 # This file is free software; the Free Software Foundation
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5 # gives unlimited permission to copy and/or distribute it,
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6 # with or without modifications, as long as this notice is preserved.
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7
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8 # On some hosts (e.g., HP-UX 10.20, SunOS 4.1.4, Solaris 2.5.1), mkstemp has a
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9 # silly limit that it can create no more than 26 files from a given template.
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10 # Other systems lack mkstemp altogether.
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11 # On OSF1/Tru64 V4.0F, the system-provided mkstemp function can create
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12 # only 32 files per process.
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13 # On some hosts, mkstemp creates files with mode 0666, which is a security
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14 # problem and a violation of POSIX 2008.
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15 # On systems like the above, arrange to use the replacement function.
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16 AC_DEFUN([gl_FUNC_MKSTEMP],
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17 [
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18 AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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19 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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20
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21 AC_CHECK_FUNCS_ONCE([mkstemp])
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22 if test $ac_cv_func_mkstemp = yes; then
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23 AC_CACHE_CHECK([for working mkstemp],
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24 [gl_cv_func_working_mkstemp],
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25 [
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26 mkdir conftest.mkstemp
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27 AC_RUN_IFELSE(
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28 [AC_LANG_PROGRAM(
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29 [AC_INCLUDES_DEFAULT],
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30 [[int result = 0;
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31 int i;
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32 off_t large = (off_t) 4294967295u;
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33 if (large < 0)
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34 large = 2147483647;
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35 umask (0);
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36 for (i = 0; i < 70; i++)
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37 {
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38 char templ[] = "conftest.mkstemp/coXXXXXX";
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39 int (*mkstemp_function) (char *) = mkstemp;
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40 int fd = mkstemp_function (templ);
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41 if (fd < 0)
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42 result |= 1;
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43 else
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44 {
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45 struct stat st;
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46 if (lseek (fd, large, SEEK_SET) != large)
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47 result |= 2;
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48 if (fstat (fd, &st) < 0)
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49 result |= 4;
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50 else if (st.st_mode & 0077)
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51 result |= 8;
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52 if (close (fd))
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53 result |= 16;
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54 }
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55 }
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56 return result;]])],
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57 [gl_cv_func_working_mkstemp=yes],
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58 [gl_cv_func_working_mkstemp=no],
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59 [case "$host_os" in
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60 # Guess yes on glibc systems.
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61 *-gnu* | gnu*) gl_cv_func_working_mkstemp="guessing yes" ;;
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62 # Guess no on native Windows.
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63 mingw*) gl_cv_func_working_mkstemp="guessing no" ;;
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64 # If we don't know, assume the worst.
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65 *) gl_cv_func_working_mkstemp="guessing no" ;;
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66 esac
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67 ])
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68 rm -rf conftest.mkstemp
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69 ])
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70 case "$gl_cv_func_working_mkstemp" in
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71 *yes) ;;
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72 *)
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73 REPLACE_MKSTEMP=1
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74 ;;
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75 esac
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76 else
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77 HAVE_MKSTEMP=0
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78 fi
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79 ])
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80
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81 # Prerequisites of lib/mkstemp.c.
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82 AC_DEFUN([gl_PREREQ_MKSTEMP],
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83 [
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84 ])