(UTILS_FUNC_MKSTEMP): New file and macro.

Prompted by a report from Bob Proulx.

1 files changed, 51 insertions, 0 deletions

diff --git a/m4/mkstemp.m4 b/m4/mkstemp.m4
new file mode 100644
index 000000000..21bcc381d
--- /dev/null
+++ b/m4/mkstemp.m4
@@ -0,0 +1,51 @@
+#serial 1
+
+# On some systems (e.g., HPUX-10.20), mkstemp has the silly limit that it
+# can create no more than 26 files from a given template.  Other systems
+# lack mkstemp altogether.  On either type of system, arrange to use the
+# replacement function.
+AC_DEFUN([UTILS_FUNC_MKSTEMP],
+[dnl
+  AC_REPLACE_FUNCS(mkstemp)
+  if test $ac_cv_func_mkstemp = no; then
+    utils_cv_func_mkstemp_limitations=yes
+  else
+    AC_CACHE_CHECK([for mkstemp limitations],
+      utils_cv_func_mkstemp_limitations,
+      [
+	utils_tmpdir_mkstemp=mkst-$$$$
+	# Arrange for deletion-upon-exception of this temporary directory.
+	ac_clean_files="$ac_clean_files $utils_tmpdir_mkstemp"
+	mkdir $utils_tmpdir_mkstemp
+
+	AC_TRY_RUN([
+#         include <stdlib.h>
+	  int main ()
+	  {
+	    int i;
+	    for (i = 0; i < 30; i++)
+	      {
+		char template[] = "$utils_tmpdir_mkstemp/aXXXXXX";
+		if (mkstemp (template) == -1)
+		  exit (1);
+	      }
+	    exit (0);
+	  }
+	  ],
+	utils_cv_func_mkstemp_limitations=no,
+	utils_cv_func_mkstemp_limitations=yes,
+	utils_cv_func_mkstemp_limitations=yes
+	)
+
+	rm -rf $utils_tmpdir_mkstemp
+      ]
+    )
+  fi
+
+  if test $utils_cv_func_mkstemp_limitations = yes; then
+    AC_LIBOBJ(mkstemp)
+    AC_LIBOBJ(tempname)
+    AC_DEFINE(mkstemp, rpl_mkstemp,
+      [Define to rpl_mkstemp if the replacement function should be used.])
+  fi
+])