75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/* Create a device inode.
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Copyright (C) 2009-2022 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* written by Eric Blake */
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#include <config.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <string.h>
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#if !HAVE_MKNOD
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/* Mingw lacks mknod; always fail with ENOSYS. */
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int
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mknod (_GL_UNUSED char const *name, _GL_UNUSED mode_t mode,
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_GL_UNUSED dev_t dev)
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{
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errno = ENOSYS;
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return -1;
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}
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#else /* HAVE_MKNOD */
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# undef mknod
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/* Create a file system node FILE, with access permissions and file
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type in MODE, and device type in DEV. Usually, non-root
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applications can only create named fifos (mode includes S_IFIFO),
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with DEV set to 0. Also work around trailing slash bugs. */
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int
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rpl_mknod (char const *name, mode_t mode, dev_t dev)
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{
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# if MKFIFO_TRAILING_SLASH_BUG
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/* Trailing slash only makes sense for directories. Of course,
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using mknod to create a directory is not very portable, so it may
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still fail later on. */
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if (!S_ISDIR (mode))
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{
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size_t len = strlen (name);
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if (len && name[len - 1] == '/')
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{
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struct stat st;
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if (stat (name, &st) == 0 || errno == EOVERFLOW)
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errno = EEXIST;
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return -1;
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}
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}
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# endif
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# if MKNOD_FIFO_BUG
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/* POSIX requires mknod to create fifos for non-privileged
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processes, but BSD implementations fail with EPERM. */
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if (S_ISFIFO (mode) && dev == 0)
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return mkfifo (name, mode & ~S_IFIFO);
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# endif
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return mknod (name, mode, dev);
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}
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#endif /* HAVE_MKNOD */
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