| #include <assert.h> |
| #include <fcntl.h> |
| #include <sys/ioctl.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| int main() { |
| // open of standard streams works. |
| int fd_in = open("/dev/stdin", 0); |
| assert(fd_in == 0); |
| int fd_out = open("/dev/stdout", 0); |
| assert(fd_out == 1); |
| int fd_err = open("/dev/stderr", 0); |
| assert(fd_err == 2); |
| // ioctl and fcntl fail |
| int i = ioctl(1, 0); |
| assert(i < 0); |
| int f = fcntl(1, 0); |
| assert(f < 0); |
| // write to standard streams works. |
| write(1, "hello, world!", 5); |
| write(1, "\n", 1); |
| } |
