Fork & Execv

Below code is simple fork & execv code for system programming

The sender generate a thread to print "I run".

After sender generate the thread,

it just prints out the PID of the thread.

Receiver is the thread.

 

//Receiver

#include <stdio.h>

#define DIE(x) perror(x), exit(1)

int main(int argc, char **argv)
{
        printf("I run %s\n", argv[1]);

        return 0;
}

 

//Sender

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>

int main()
{
        int status;
        pid_t pid;
        char *argv[3];

        argv[0] = "test1";
        argv[1] = "boot";
        argv[2] = NULL;

        switch(pid=fork())
        {
        case -1: // Error
                perror("fork");
                exit(1);
                break;
        case 0: // child
                printf("%d\n", (int)getpid());
                execv("test1", argv);
                exit(0);
                break;
        default:
                while(wait(&status) != pid)
                        continue;
                printf("%d\n", (int)getpid());
                break;
        }

        return 0;
}

 

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