#include #include #include "ourhdr.h" int main(int argc, char *argv[]) { if (argc != 2) err_quit("usage: a.out "); if (access(argv[1], R_OK) < 0) err_ret("access error for %s", argv[1]); else printf("read access OK\n"); if (open(argv[1], O_RDONLY) < 0) err_ret("open error for %s", argv[1]); else printf("open for reading OK\n"); exit(0); }