linux进程控制开发实例

fork.c

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

int main(void)
{
    pid_t result;

    result = fork();

    if (result == -)
    {
        printf("Fork Error!\n");
    }
    else
    {
        if (result == )
        {
            printf("The returned value is %d\nThe child process!!\nMy PID is %d\n", result, getpid());
        }
        else
        {
            printf("The returned value is %d\nThe father process!!\nMy PID is %d\n", result, getpid());
        }
    }

    return ;
}

exec.c

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    pid_t result;

    result = fork();

    if (result == )
    {
        if (execlp("ps", "ps", "-ef", NULL) < )
        {
            printf("Execlp error\n");
        }
    }

    return ;
}

waitpid.c

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

int main(void)
{
    pid_t pc, pr;

    pc = fork();

    if (pc < )
    {
        printf("Error fork\n");
    }
    else if (pc == )
    {
        sleep();
        exit();
    }
    else
    {
        do
        {
            pr = waitpid(pc, NULL, WNOHANG);

            if(pr == )
            {
                printf("The child process has not exited!\n");
                sleep();
            }
        }while (pr == );

        if (pr == pc)
        {
            printf("Get child exit code: %d\n", pr);
        }
        else
        {
            printf("Some error occured.\n");
        }
    }

    return ;
}

参考资料：《嵌入式Linux应用程序开发标准教程》