fork
fork () function is used to create a new process from a process that already exists, the new process is called the child process, and the original process is called the parent process.
| Points | Explanation |
|---|---|
| The required header files | #include <sys / types.h> / provide type definition pid_t / #include <unistd.h> |
| Function prototype | pid_t fork(void) |
| Function return value | 0: child process pid child processes: the parent -1: Error |