diff options
1 files changed, 24 insertions, 0 deletions
| -rw-r--r-- | Year 3/System programming/Practice02/ex2.c | 24 |
diff --git a/Year 3/System programming/Practice02/ex2.c b/Year 3/System programming/Practice02/ex2.c new file mode 100644 index 0000000..6a8c420 --- /dev/null +++ b/Year 3/System programming/Practice02/ex2.c @@ -0,0 +1,24 @@ +#include <fcntl.h> // open, close, O_WRONLY, ... +#include <unistd.h> // dup +#include <stdio.h> // printf + +int main(int argc, char* argv[]) { + int f1 = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0755); + if (f1 < 0) { + perror("open"); + return 1; + } + + close(1); + + int f2 = dup(f1); + if (f2 < 0) { + perror("dup"); + return 2; + } + + printf("Hello World!\n"); + + close(f1); + close(f2); +} |