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https://github.com/versity/scoutfs.git
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Zach Brown
82c2d0b1d0
Add a test binary that uses o_tmpfile and linkat to create a file in a given dir. We have something similar, but it's weirdly specific to a given test. This is a simpler building block that could be used by more tests. Signed-off-by: Zach Brown <zab@versity.com>
72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
/*
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* Copyright (C) 2023 Versity Software, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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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 GNU
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* General Public License for more details.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <limits.h>
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static void linkat_tmpfile(char *dir, char *lpath)
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{
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char proc_self[PATH_MAX];
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int ret;
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int fd;
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fd = open(dir, O_RDWR | O_TMPFILE, 0777);
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if (fd < 0) {
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perror("open(O_TMPFILE)");
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exit(1);
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}
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snprintf(proc_self, sizeof(proc_self), "/proc/self/fd/%d", fd);
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ret = linkat(AT_FDCWD, proc_self, AT_FDCWD, lpath, AT_SYMLINK_FOLLOW);
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if (ret < 0) {
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perror("linkat");
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exit(1);
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}
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close(fd);
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}
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/*
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* Use O_TMPFILE and linkat to create a new visible file, used to test
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* the O_TMPFILE creation path by inspecting the created file.
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*/
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int main(int argc, char **argv)
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{
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char *lpath;
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char *dir;
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if (argc < 3) {
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printf("%s <open_dir> <linkat_path>\n", argv[0]);
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return 1;
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}
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dir = argv[1];
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lpath = argv[2];
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linkat_tmpfile(dir, lpath);
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return 0;
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}
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