2009-11-11 Eric Blake <ebb9@byu.net>
+ mknod: new module
+ * modules/mknod: New file.
+ * m4/mknod.m4 (gl_FUNC_MKNOD): Likewise.
+ * lib/mknod.c (mknod): Likewise.
+ * m4/sys_stat_h.m4 (gl_SYS_STAT_H_DEFAULTS): Set witness
+ defaults.
+ * modules/sys_stat (Makefile.am): Substitute them.
+ * lib/sys_stat.in.h (mknod): Declare replacement.
+ * MODULES.html.sh (Support for systems lacking POSIX:2008):
+ Document it.
+ * doc/posix-functions/mknod.texi (mknod): Likewise.
+ * modules/mknod-tests: New test.
+ * tests/test-mknod.c: Likewise.
+
mkfifo: new module
* modules/mkfifo: New file.
* m4/mkfifo.m4 (gl_FUNC_MKFIFO): Likewise.
func_module mkdir
func_module mkdtemp
func_module mkfifo
+ func_module mknod
func_module mkstemp
func_module netdb
func_module netinet_in
POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/mknod.html}
-Gnulib module: ---
+Gnulib module: mknod
Portability problems fixed by Gnulib:
@itemize
+@item
+This function requires super-user privileges to create a fifo:
+FreeBSD 7.2, OpenBSD 3.8.
+@item
+This function mishandles trailing slash on some platforms:
+FreeBSD 7.2, Solaris 9.
+@item
+This function is missing on some platforms; however, the replacement
+always fails with @code{ENOSYS}:
+mingw.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
-This function is missing on some platforms:
-mingw.
+Use of this function for anything except fifos is not portable,
+generally requiring super-user privileges and knowledge of supported
+device numbers.
@end itemize
--- /dev/null
+/* Create a device inode.
+ Copyright (C) 2009 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* written by Eric Blake */
+
+#include <config.h>
+
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <string.h>
+
+#if !HAVE_MKNOD
+/* Mingw lacks mknod; always fail with ENOSYS. */
+
+int
+mknod (char const *name _UNUSED_PARAMETER_, mode_t mode _UNUSED_PARAMETER_,
+ dev_t dev _UNUSED_PARAMETER_)
+{
+ errno = ENOSYS;
+ return -1;
+}
+
+#else /* HAVE_MKNOD */
+
+# undef mknod
+
+/* Create a file system node FILE, with access permissions and file
+ type in MODE, and device type in DEV. Usually, non-root
+ applications can only create named fifos (mode includes S_IFIFO),
+ with DEV set to 0. Also work around trailing slash bugs. */
+
+int
+rpl_mknod (char const *name, mode_t mode, dev_t dev)
+{
+# if MKFIFO_TRAILING_SLASH_BUG
+ /* Trailing slash only makes sense for directories. Of course,
+ using mknod to create a directory is not very portable, so it may
+ still fail later on. */
+ if (!S_ISDIR (mode))
+ {
+ size_t len = strlen (name);
+ if (len && name[len - 1] == '/')
+ {
+ struct stat st;
+ if (stat (name, &st) == 0)
+ errno = EEXIST;
+ return -1;
+ }
+ }
+# endif
+# if MKNOD_FIFO_BUG
+ /* POSIX requires mknod to create fifos for non-privileged
+ processes, but BSD implementations fail with EPERM. */
+ if (S_ISFIFO (mode) && dev == 0)
+ return mkfifo (name, mode & ~S_IFIFO);
+# endif
+ return mknod (name, mode, dev);
+}
+
+#endif /* HAVE_MKNOD */
#endif
+#if @GNULIB_MKNOD@
+# if @REPLACE_MKNOD@
+# undef mknod
+# define mknod rpl_mknod
+# endif
+# if !@HAVE_MKNOD@ || @REPLACE_MKNOD@
+int mknod (char const *file, mode_t mode, dev_t dev);
+# endif
+#elif defined GNULIB_POSIXCHECK
+# undef mknod
+# define mknod(n,m,d) \
+ (GL_LINK_WARNING ("mknod is not portable - " \
+ "use gnulib module mknod for portability"), \
+ mknod (n, m, d))
+#endif
+
+
#if @GNULIB_MKNODAT@
# if !@HAVE_MKNODAT@
int mknodat (int fd, char const *file, mode_t mode, dev_t dev);
--- /dev/null
+# serial 1
+# See if we need to provide mknod replacement.
+
+dnl Copyright (C) 2009 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+# Written by Eric Blake.
+
+AC_DEFUN([gl_FUNC_MKNOD],
+[
+ AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
+ AC_REQUIRE([gl_FUNC_MKFIFO])
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ AC_CHECK_FUNCS_ONCE([mknod])
+ if test $ac_cv_func_mknod = no; then
+ HAVE_MKNOD=0
+ AC_LIBOBJ([mknod])
+ else
+ dnl Detect BSD bug, where mknod requires root privileges to create fifo.
+ AC_CACHE_CHECK([whether mknod can create fifo without root privileges],
+ [gl_cv_func_mknod_works],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <sys/stat.h>
+ #include <unistd.h>
+]], [[/* Indeterminate for super-user, assume no. Why are you running
+ configure as root, anyway? */
+ if (!geteuid ()) return 1;
+ if (mknod ("conftest.fifo", S_IFIFO | 0600, 0)) return 2;]])],
+ [gl_cv_func_mknod_works=yes], [gl_cv_func_mknod_works=no],
+ [gl_cv_func_mknod_works="guessing no"])
+ rm -f conftest.fifo])
+ if test "$gl_cv_func_mknod_works" != yes; then
+ AC_DEFINE([MKNOD_FIFO_BUG], [1], [Define to 1 if mknod cannot create
+ a fifo without super-user privileges])
+ fi
+ dnl Systems that mishandle trailing slash on mkfifo also goof on mknod.
+ if test $REPLACE_MKFIFO = 1 || test "$gl_cv_func_mknod_works" != yes; then
+ REPLACE_MKNOD=1
+ AC_LIBOBJ([mknod])
+ fi
+ fi
+])
-# sys_stat_h.m4 serial 20 -*- Autoconf -*-
+# sys_stat_h.m4 serial 21 -*- Autoconf -*-
dnl Copyright (C) 2006-2009 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
GNULIB_MKDIRAT=0; AC_SUBST([GNULIB_MKDIRAT])
GNULIB_MKFIFO=0; AC_SUBST([GNULIB_MKFIFO])
GNULIB_MKFIFOAT=0; AC_SUBST([GNULIB_MKFIFOAT])
+ GNULIB_MKNOD=0; AC_SUBST([GNULIB_MKNOD])
GNULIB_MKNODAT=0; AC_SUBST([GNULIB_MKNODAT])
GNULIB_STAT=0; AC_SUBST([GNULIB_STAT])
GNULIB_UTIMENSAT=0; AC_SUBST([GNULIB_UTIMENSAT])
HAVE_MKDIRAT=1; AC_SUBST([HAVE_MKDIRAT])
HAVE_MKFIFO=1; AC_SUBST([HAVE_MKFIFO])
HAVE_MKFIFOAT=1; AC_SUBST([HAVE_MKFIFOAT])
+ HAVE_MKNOD=1; AC_SUBST([HAVE_MKNOD])
HAVE_MKNODAT=1; AC_SUBST([HAVE_MKNODAT])
HAVE_UTIMENSAT=1; AC_SUBST([HAVE_UTIMENSAT])
REPLACE_FSTAT=0; AC_SUBST([REPLACE_FSTAT])
REPLACE_LSTAT=0; AC_SUBST([REPLACE_LSTAT])
REPLACE_MKDIR=0; AC_SUBST([REPLACE_MKDIR])
REPLACE_MKFIFO=0; AC_SUBST([REPLACE_MKFIFO])
+ REPLACE_MKNOD=0; AC_SUBST([REPLACE_MKNOD])
REPLACE_STAT=0; AC_SUBST([REPLACE_STAT])
REPLACE_UTIMENSAT=0; AC_SUBST([REPLACE_UTIMENSAT])
])
--- /dev/null
+Description:
+mknod(): create various special devices
+
+Files:
+lib/mknod.c
+m4/mknod.m4
+
+Depends-on:
+mkfifo
+stat
+sys_stat
+
+configure.ac:
+gl_FUNC_MKNOD
+gl_UNISTD_MODULE_INDICATOR([mknod])
+
+Makefile.am:
+
+Include:
+<sys/stat.h>
+
+License:
+LGPL
+
+Maintainer:
+Eric Blake
--- /dev/null
+Files:
+tests/test-mkfifo.h
+tests/test-mknod.c
+
+Depends-on:
+stdbool
+symlink
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-mknod
+check_PROGRAMS += test-mknod
-e 's|@''GNULIB_MKDIRAT''@|$(GNULIB_MKDIRAT)|g' \
-e 's|@''GNULIB_MKFIFO''@|$(GNULIB_MKFIFO)|g' \
-e 's|@''GNULIB_MKFIFOAT''@|$(GNULIB_MKFIFOAT)|g' \
+ -e 's|@''GNULIB_MKNOD''@|$(GNULIB_MKNOD)|g' \
-e 's|@''GNULIB_MKNODAT''@|$(GNULIB_MKNODAT)|g' \
-e 's|@''GNULIB_STAT''@|$(GNULIB_STAT)|g' \
-e 's|@''GNULIB_UTIMENSAT''@|$(GNULIB_UTIMENSAT)|g' \
-e 's|@''HAVE_MKDIRAT''@|$(HAVE_MKDIRAT)|g' \
-e 's|@''HAVE_MKFIFO''@|$(HAVE_MKFIFO)|g' \
-e 's|@''HAVE_MKFIFOAT''@|$(HAVE_MKFIFOAT)|g' \
+ -e 's|@''HAVE_MKNOD''@|$(HAVE_MKNOD)|g' \
-e 's|@''HAVE_MKNODAT''@|$(HAVE_MKNODAT)|g' \
-e 's|@''HAVE_UTIMENSAT''@|$(HAVE_UTIMENSAT)|g' \
-e 's|@''REPLACE_FSTAT''@|$(REPLACE_FSTAT)|g' \
-e 's|@''REPLACE_LSTAT''@|$(REPLACE_LSTAT)|g' \
-e 's|@''REPLACE_MKDIR''@|$(REPLACE_MKDIR)|g' \
-e 's|@''REPLACE_MKFIFO''@|$(REPLACE_MKFIFO)|g' \
+ -e 's|@''REPLACE_MKNOD''@|$(REPLACE_MKNOD)|g' \
-e 's|@''REPLACE_STAT''@|$(REPLACE_STAT)|g' \
-e 's|@''REPLACE_UTIMENSAT''@|$(REPLACE_UTIMENSAT)|g' \
-e '/definition of GL_LINK_WARNING/r $(LINK_WARNING_H)' \
--- /dev/null
+/* Tests of mknod.
+ Copyright (C) 2009 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Written by Eric Blake <ebb9@byu.net>, 2009. */
+
+#include <config.h>
+
+#include <sys/stat.h>
+
+#include <fcntl.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define ASSERT(expr) \
+ do \
+ { \
+ if (!(expr)) \
+ { \
+ fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+ fflush (stderr); \
+ abort (); \
+ } \
+ } \
+ while (0)
+
+#define BASE "test-mknod.t"
+
+#include "test-mkfifo.h"
+
+/* Wrapper around mknod, to create fifos. */
+static int
+do_mknod (char const *name, mode_t mode)
+{
+ return mknod (name, mode | S_IFIFO, 0);
+}
+
+int
+main (void)
+{
+ /* Remove any leftovers from a previous partial run. */
+ ASSERT (system ("rm -rf " BASE "*") == 0);
+
+ /* We can only portably test creation of fifos. Anything else
+ requires root privileges and knowledge of device numbers. */
+ return test_mkfifo (do_mknod, true);
+}
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