#include <stdio.h> | |
#include <stdint.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
#include <sys/types.h> | |
#include <sys/stat.h> | |
#include <fcntl.h> | |
#include <errno.h> | |
#include <string.h> | |
int main(int argc, char **argv) | |
{ | |
const char *path; | |
char buf[4]; | |
int fd, rc; | |
if (argc < 2) { | |
fprintf(stderr, "usage: %s <path>\n", argv[0]); | |
return EXIT_FAILURE; | |
} | |
path = argv[1]; | |
/* create a test variable */ | |
fd = open(path, O_RDWR | O_CREAT, 0600); | |
if (fd < 0) { | |
perror("open(O_WRONLY)"); | |
return EXIT_FAILURE; | |
} | |
rc = read(fd, buf, sizeof(buf)); | |
if (rc != 0) { | |
fprintf(stderr, "Reading a new var should return EOF\n"); | |
return EXIT_FAILURE; | |
} | |
return EXIT_SUCCESS; | |
} |