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Description: 1、 了解系统调用fork()、execl()、exit()、getpid()和waitpid()的功能和实现过程
2、 编写一段程序实现以下功能：
a) 使用系统调用fork()创建两个子进程
b) 父进程重复显示字符串”parent:”，并使用函数getpid()显示自己的进程ID。
c) 两个子进程分别重复显示字符串”child:”，并使用函数getpid()显示自己的进程ID
3、 编写一段程序实现以下功能：
a) 使用系统调用fork()创建一个子进程
b) 子进程显示自己的进程ID和字符串\": The child is calling an exec.\\n\"，然后通过execl()调用系统命令ps显示当前运行的进程情况，从而更换自己的执行代码，最后调用exit()结束。
c) 父进程显示自己的进程ID和字符串” \": The parent is waiting for child to exit.\\n \"，然后调用waitpid()等待子进程结束，并在子进程结束后显示”The parent exit.\\n
-1, the understanding of the system call fork (), execl (), exit (), getpid (), and waitpid () function and process 2, write a procedure to achieve the following functions : a) The use of system calls fork () to create two child process b) the parent process repeated string "parent : ", and the use of function getpid () show their ID process. C) two separate child process repeated string "child :" and the use of function getpid () show their ID 3 process, to prepare a process to achieve the following functions : a) The use of system calls fork () to create a child process b) children show their ID process, and the string " : The child is calling an exec. \\ n " Then execl () call system commands ps shows currently running process, thereby replacing the execution
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Size: 8212 |
Author: witkey_eagle |
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Description: 根据网卡生成加密-- 简单的应用
String command = \" c:/winnt/system32/ipconfig /all\"
Process p = Runtime.getRuntime().exec(command)
Platform: |
Size: 2215417 |
Author: liu |
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Description: 1、 了解系统调用fork()、execl()、exit()、getpid()和waitpid()的功能和实现过程
2、 编写一段程序实现以下功能：
a) 使用系统调用fork()创建两个子进程
b) 父进程重复显示字符串”parent:”，并使用函数getpid()显示自己的进程ID。
c) 两个子进程分别重复显示字符串”child:”，并使用函数getpid()显示自己的进程ID
3、 编写一段程序实现以下功能：
a) 使用系统调用fork()创建一个子进程
b) 子进程显示自己的进程ID和字符串": The child is calling an exec.\n"，然后通过execl()调用系统命令ps显示当前运行的进程情况，从而更换自己的执行代码，最后调用exit()结束。
c) 父进程显示自己的进程ID和字符串” ": The parent is waiting for child to exit.\n "，然后调用waitpid()等待子进程结束，并在子进程结束后显示”The parent exit.\n
-1, the understanding of the system call fork (), execl (), exit (), getpid (), and waitpid () function and process 2, write a procedure to achieve the following functions : a) The use of system calls fork () to create two child process b) the parent process repeated string "parent : ", and the use of function getpid () show their ID process. C) two separate child process repeated string "child :" and the use of function getpid () show their ID 3 process, to prepare a process to achieve the following functions : a) The use of system calls fork () to create a child process b) children show their ID process, and the string " : The child is calling an exec. \ n " Then execl () call system commands ps shows currently running process, thereby replacing the execution
Platform: |
Size: 8192 |
Author: |
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Description: 根据网卡生成加密-- 简单的应用
String command = " c:/winnt/system32/ipconfig /all"
Process p = Runtime.getRuntime().exec(command) -According to the network card to generate a simple encryption application String command = c:/winnt/system32/ipconfig/all Process p = Runtime.getRuntime (). Exec (command)
Platform: |
Size: 2214912 |
Author: liu |
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Description: 动态sql语句基本语法
1 :普通SQL语句可以用Exec执行
eg: Select * from tableName
Exec( select * from tableName )
Exec sp_executesql N select * from tableName -- 请注意字符串前一定要加N
2:字段名，表名，数据库名之类作为变量时，必须用动态SQL
eg:
declare @fname varchar(20)
set @fname = FiledName
Select @fname from tableName -- 错误,不会提示错误，但结果为固定值FiledName,并非所要。-Basic grammar dynamic sql statement one: ordinary SQL statement Exec can be used to implement eg: Select* from tableName Exec (select* from tableName) Exec sp_executesql N select* from tableName Please note that the string must be added before the N 2: field names, table name, database name, such as variables, we must use dynamic SQL eg: declare @ fname varchar (20) set @ fname = FiledName Select @ fname from tableName error will not prompt an error, but the result for the fixed value FiledName, not to be.
Platform: |
Size: 70656 |
Author: 风尘小子 |
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Description: 1、 用C语言写一个程序名字为procs4，该程序运行过程中共有4个进程，procs4程序（父进程）创建2个子进程p1和p2，p1子进程再创建一个子进程p3。4个进程完成如下工作:
父进程并打印字符串“I am main process”；p1子进程打印“I am child process p1”字符串；p2子进程打印“I am child process p2”；子进程p3打印字符串“I am child process p3”，然后使用exec（族）系统调用打印当前目录下文件和子目录下的详细信息。并且每个进程的要打印自己的pid。
2、 使用任何一种通信机制实现p1进程和p2进程之间的通信，可以使用的通信机制如：管道、消息队列、共享内存等。P1进程发送“Child process p1 is sending a message!”信息给p2进程，P2进程发送“Child process p2 is sending a message!” 信息给p1进程，p1和p2两个子进程接受信息后分别打印着两个字符串。
3、 编写程序实现生产者-消费者问题。使用linux的Pthread线程库，创建生产者和消费者两个线程，生产者线程计算当前的时间并放入缓冲区，每次计算一个时间数据；消费者线程从缓冲区读出并打印生产者计算的时间，每次打印一个时间数据。缓冲区大小为5个，生产和消费的消息数为10个，即生产和消费分别为10次。-1, using C language to write a program named procs4, the program is running a total of four processes, procs4 process (parent process) to create two sub-processes p1 and p2, p1 sub-process re-creates a child process p3. 4 key process to complete the following work:
The parent process and print the string "I am main process" p1 child process print "I am child process p1" string p2 child process print "I am child process p2" child process p3 print the string "I am child process p3 ", and then use the exec (tribe) system call to print the current directory files and subdirectories under the details. And each process, you want to print their own pid.
2, using any kind of communication mechanism to achieve the p1 and p2 the process of communication between processes, you can use the communication mechanisms such as: pipes, message queues, shared memory, and so on. Process P1 sends "Child process p1 is sending a message!" Message to the p2 process, P2 process sends "Child process p2 i
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Size: 2048 |
Author: 杨子坤 |
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Description: 在文本中存取一個字串,這個字串是一個command命令,利用java讀取文本的函數讀取文本中的內容,然後利用runtime中的exec執行這個命令-Access a string in the text, this string is a command command using java read text function reads the contents of the text, and then use the runtime exec execute this command
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Size: 7168 |
Author: 李浩 |
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