fork()是一个系统调用函数,可以从父主进程生成子进程。使用某些条件,我们可以根据需要生成尽可能多的子进程。
我们给了n,我们必须从相同的父进程(主进程)创建n个子进程。
例子:
Input :3
Output :[son] pid 25332 from [parent] pid 25329
[son] pid 25331 from [parent] pid 25329
[son] pid 25330 from [parent] pid 25329
here 25332, 25331,25330 are child processes from same parent process
with process id 25329
Input :5
Output :[son] pid 28519 from [parent] pid 28518
[son] pid 28523 from [parent] pid 28518
[son] pid 28520 from [parent] pid 28518
[son] pid 28521 from [parent] pid 28518
[son] pid 28522 from [parent] pid 28518
here 28519, 28519,28520,28521,28522 are child processes from same parent process
with process id 28518
#include
int main()
{
for(int i=0;i<5;i++) // loop will run n times (n=5)
{
if(fork() == 0)
{
printf("[son] pid %d from [parent] pid %d\n",getpid(),getppid());
exit(0);
}
}
for(int i=0;i<5;i++) // loop will run n times (n=5)
wait(NULL);
}
输出:
[son] pid 28519 from [parent] pid 28518
[son] pid 28523 from [parent] pid 28518
[son] pid 28520 from [parent] pid 28518
[son] pid 28521 from [parent] pid 28518
[son] pid 28522 from [parent] pid 28518
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