97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
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/* Create a named fifo relative to an open directory.
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Copyright (C) 2009-2022 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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 General Public License for more details.
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You should have received a copy of the GNU 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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/* Specification. */
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#include <sys/stat.h>
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#include <stdlib.h>
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#if HAVE_MKFIFOAT
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# include <errno.h>
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# include <fcntl.h>
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# include <string.h>
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int
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rpl_mkfifoat (int fd, char const *file, mode_t mode)
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#undef mkfifoat
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{
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/* Use the original mkfifoat(), but correct the trailing slash handling. */
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size_t len = strlen (file);
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if (len && file[len - 1] == '/')
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{
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struct stat st;
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if (fstatat (fd, file, &st, AT_SYMLINK_NOFOLLOW) < 0)
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{
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if (errno == EOVERFLOW)
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/* It's surely a file, not a directory. */
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errno = ENOTDIR;
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}
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else
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{
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/* It's a directory, otherwise fstatat() would have reported an error
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ENOTDIR. */
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errno = EEXIST;
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}
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return -1;
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}
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return mkfifoat (fd, file, mode);
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}
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#else
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# if !HAVE_MKFIFO
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# include <errno.h>
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/* Mingw lacks mkfifo, so this wrapper is trivial. */
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int
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mkfifoat (_GL_UNUSED int fd, _GL_UNUSED char const *path,
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_GL_UNUSED mode_t mode)
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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_MKFIFO */
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/* Create a named fifo FILE relative to directory FD, with access
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permissions in MODE. If possible, do it without changing the
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working directory. Otherwise, resort to using save_cwd/fchdir,
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then mkfifo/restore_cwd. If either the save_cwd or the restore_cwd
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fails, then give a diagnostic and exit nonzero. */
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# define AT_FUNC_NAME mkfifoat
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# define AT_FUNC_F1 mkfifo
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# define AT_FUNC_POST_FILE_PARAM_DECLS , mode_t mode
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# define AT_FUNC_POST_FILE_ARGS , mode
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# include "at-func.c"
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# undef AT_FUNC_NAME
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# undef AT_FUNC_F1
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# undef AT_FUNC_POST_FILE_PARAM_DECLS
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# undef AT_FUNC_POST_FILE_ARGS
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# endif /* HAVE_MKFIFO */
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#endif /* HAVE_MKFIFOAT */
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