linux多进程操作demon

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/*author:cugwxs   date:2015.12.26    fuction:linux多线程操作demon*/#include <sys/types.h>#include <sys/wait.h>#include <unistd.h>#include <stdlib.h>int main (){pid_t pc0,pc1,pr0,pr1;unsigned int i,j,z;pc0 = fork();if (pc0 < 0)printf("error0 ocurred!\n");else if(pc0>0){pc1=fork();if(pc1<0){printf("error0 ocurred!\n");}else if(pc1>0){printf("This is child1 process with pid of %d\n",getpid());for(i=0;i<100;i++){printf("child1:%d\n",i);}sleep(5);}//if(waitpid(pc1,NULL,0)==pc1)//依次执行进程PC1及其父进程if(waitpid(pc1,NULL,WNOHANG))//同步执行进程PC1及其父进程{printf("This is partent1 process with pid of %d\n",getpid());for(j=0;j<100;j++){printf("partent1:%d\n",j);}}}//if(waitpid(pc0,NULL,WNOHANG))//同步执行进程PC1及其父进程和PC0进程if(waitpid(pc0,NULL,0)==pc0)//依次执行(进程PC1及其父进程)和PC0进程{printf("This is partent with pid of %d\n",getpid());for(z=0;z<20;z++){printf("partent of child1:%d\n",z);}}}

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