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/* Create a device inode.
Copyright (C) 2009-2020 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 <https://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 _GL_UNUSED, mode_t mode _GL_UNUSED,
dev_t dev _GL_UNUSED)
{
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 */
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