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} 42