> For the complete documentation index, see [llms.txt](https://eric-lo.gitbook.io/lab4-process/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://eric-lo.gitbook.io/lab4-process/wait/without-wait.md).

# Problem 1: Without Wait?

Below it is a typical problem to print something in child.

```c
/* Wait/problematic.c */
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>


int main(int argc,char *argv[])
{
    printf("Before fork...\n");
    if(fork() == 0)
    {
        printf("Hello World!\n");
        exit(0);
    }
    printf("After fork..\n");
    return 0;
}
```

We expect the output to be:

```
Before fork...
Hello World!
After fork...
```

However, the actual output may become

```
Before fork...
After fork...
Hello World!
```

We would like to **suspend** the parent and let the child finish execution.