162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0
262306a36Sopenharmony_ci#include <stdio.h>
362306a36Sopenharmony_ci#include <stdint.h>
462306a36Sopenharmony_ci#include <stdlib.h>
562306a36Sopenharmony_ci#include <unistd.h>
662306a36Sopenharmony_ci#include <sys/types.h>
762306a36Sopenharmony_ci#include <sys/stat.h>
862306a36Sopenharmony_ci#include <fcntl.h>
962306a36Sopenharmony_ci#include <errno.h>
1062306a36Sopenharmony_ci#include <string.h>
1162306a36Sopenharmony_ci
1262306a36Sopenharmony_ciint main(int argc, char **argv)
1362306a36Sopenharmony_ci{
1462306a36Sopenharmony_ci	const char *path;
1562306a36Sopenharmony_ci	char buf[4];
1662306a36Sopenharmony_ci	int fd, rc;
1762306a36Sopenharmony_ci
1862306a36Sopenharmony_ci	if (argc < 2) {
1962306a36Sopenharmony_ci		fprintf(stderr, "usage: %s <path>\n", argv[0]);
2062306a36Sopenharmony_ci		return EXIT_FAILURE;
2162306a36Sopenharmony_ci	}
2262306a36Sopenharmony_ci
2362306a36Sopenharmony_ci	path = argv[1];
2462306a36Sopenharmony_ci
2562306a36Sopenharmony_ci	/* create a test variable */
2662306a36Sopenharmony_ci	fd = open(path, O_RDWR | O_CREAT, 0600);
2762306a36Sopenharmony_ci	if (fd < 0) {
2862306a36Sopenharmony_ci		perror("open(O_WRONLY)");
2962306a36Sopenharmony_ci		return EXIT_FAILURE;
3062306a36Sopenharmony_ci	}
3162306a36Sopenharmony_ci
3262306a36Sopenharmony_ci	rc = read(fd, buf, sizeof(buf));
3362306a36Sopenharmony_ci	if (rc != 0) {
3462306a36Sopenharmony_ci		fprintf(stderr, "Reading a new var should return EOF\n");
3562306a36Sopenharmony_ci		close(fd);
3662306a36Sopenharmony_ci		return EXIT_FAILURE;
3762306a36Sopenharmony_ci	}
3862306a36Sopenharmony_ci
3962306a36Sopenharmony_ci	close(fd);
4062306a36Sopenharmony_ci	return EXIT_SUCCESS;
4162306a36Sopenharmony_ci}
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