sleep(10);/*睡眠10秒钟*/}else{/*如果是父进程*/pr=wait(NULL);/*在这里等待*/printf("I catched a child process with pid of %d/n"),pr); } exit(0); } 编译并运行: $ gcc wait1.c -o wait1 $ ./wait1 This is child process with pid of 1508 I catched a child process with pid...
8 pid_t pid, wpid; 9 int status; //定义传出参数 10 11 pid = fork(); 12 if(pid == -1){ 13 perror("fork error"); 14 exit(1); 15 } else if(pid == 0){ //子进程 16 printf("I'm process child, pid = %d\n", getpid()); 17 #if 0 18 execl("./abnor", "abnor",...
printf("This is child process with pid of %d\n",getpid()); } else{ sleep(20); printf("I catched a child process with pid of %d\n",pr); } exit(0); } 编译执行: gcc wait1.c -o wait1 ./wait1 This is child process with pid of 24008 I catched a child process with pid of ...
0x04 获取 PID 每一个进程在系统中,都会存在一个惟一的标识符! 这就如同每个人都有身份证号一样,进程也需要标号的,所以每个进程都存在有一个 。 Process ID: a unique integer ID assigned to each process pid_t getpid(void) // 返回当前进程pidpid_t getppid(void) // 放回父进程pid ...
This is precise as each process has a unique ID. Use the -Id parameter followed by the PID. This is useful when targeting a specific instance. wait2.ps1 Wait-Process -Id 1234 This command waits for the process with ID 1234 to terminate. The script will pause execution until this ...
与多个进程一起工作时,使用PID来标识一个进程。下面的示例脚本显示了一个用例: #!/bin/bashecho "Process 1 lasts for 2s" && sleep 2 &PID=$!echo "Process 2 lasts for 3s" && sleep 3 &echo "Current time $(date +%T)"wait $PIDecho "Process 1 ended at time $(date +%T) with exit sta...
PID为0的系统空闲进程连接状态为TIME_WAIT 如果您使用命令提示符执行命令查看网络连接情况,您会发现,PID为0的System Idle Process(系统空闲进程)将会出现很多网络端口占用情况。下面是一个示例: Proto Local Address Foreign Address State PIDTCP127.0.0.1:30606 127.0.0.1:3129 TIME_WAIT 0 TCP 127.0.0.1:30606 ...
pid_t getpid(void); getpid的作用很简单,就是返回当前进程的进程ID,请大家看以下的例子: /* getpid_test.c */ #include<unistd.h> main() { printf("The current process ID is %d\n",getpid()); } 细心的读者可能注意到了,这个程序的定义里并没有包含 头文件sys/types.h,这是因为我们在程序中没...
pid_t waitpid(pid_t pid,int*status,intoptions); 返回值: RETURN VALUEwait(): on success, returns the process ID of the terminated child; on error, -1is returned. waitpid(): on success, returns the process ID of the child whose state has changed;ifWNOHANG was specified and one ormore...
wait, waitpid, waitid - wait for process to change state #include <sys/types.h> #include <sys/wait.h> pid_t wait(int *wstatus); pid_t waitpid(pid_t pid, int *wstatus, int options); int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options); 2 waitpid处理流程 ...