42 lines · c
1// SPDX-License-Identifier: GPL-2.02#include <stdio.h>3#include <stdint.h>4#include <stdlib.h>5#include <unistd.h>6#include <sys/types.h>7#include <sys/stat.h>8#include <fcntl.h>9#include <errno.h>10#include <string.h>11 12int main(int argc, char **argv)13{14 const char *path;15 char buf[4];16 int fd, rc;17 18 if (argc < 2) {19 fprintf(stderr, "usage: %s <path>\n", argv[0]);20 return EXIT_FAILURE;21 }22 23 path = argv[1];24 25 /* create a test variable */26 fd = open(path, O_RDWR | O_CREAT, 0600);27 if (fd < 0) {28 perror("open(O_WRONLY)");29 return EXIT_FAILURE;30 }31 32 rc = read(fd, buf, sizeof(buf));33 if (rc != 0) {34 fprintf(stderr, "Reading a new var should return EOF\n");35 close(fd);36 return EXIT_FAILURE;37 }38 39 close(fd);40 return EXIT_SUCCESS;41}42