void main ()
{
if ( fork () )
{
printf ( "PID1 %d\n",getpid () );
}
else
{
printf ( "PID2 %d\n",getpid () );
}
}
这段代码有什么作用？我知道它与进程ID有关但是不应该将某些东西返回到条件中以确定它是否是子进程/父进程？
解决方法
通常它是：
pid_t pid = fork();
if(pid == 0) {
//child
} else if(pid > 0) {
//parent
} else {
//error
}
手册页说：
RETURN VALUE Upon successful completion,fork() shall return 0 to the child process and shall return the process ID of the child process to the parent process. Both processes shall continue to execute from the fork() function. Otherwise,-1 shall be returned to the parent process,no child process shall be created,and errno shall be set to indicate the error.
