IO process thread -> process -> day4

Table of Contents

a, orphan process

1.1 Orphan Function

1.2 Execution Result

Second, the zombie process

2.1 Zombie function

2.2 Execution Result

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Exercise
1. Create an orphan process
2. Create a zombie process

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First, orphan process

It means that only the child process is still executing, the parent process has ended, and the parent process number is 1.

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1.1 Orphan Function

#include #include #include int main(int argc, const char *argv[]){pid_t pid=fork();if(0 == pid){while(1){printf("Orphan Process\n");sleep(1);}}else if(pid > 0){sleep(2);}else{perror("fork");}return 0;}

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1.2 Execution Result

ps -ajx View Linux process information

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2. ZombiesProcess

That is, the parent process is still executing, and the child process has ended, but the parent process has not collected the body of the process.

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2.1 Zombie function

#include #include #include int main(int argc, const char *argv[]){pid_t pid=fork();if(0 == pid){sleep(2);}else if(pid > 0){while(1){printf("Zombie process\n");sleep(1);}}else{perror("fork");}return 0;} 

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2.2 Execution Result

ps -ajx View Linux process information