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满意答案

wym_56

.08.18

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#include

#include

int main(void) {

int p,p11,p12,p13,p21,p22;

while ((p=fork())==-1);

if (!p) {

printf("Parent with pid %d, parent pid %d.\n",getpid(),getppid());

while ((p11=fork())==-1);

if (!p11) {

printf("child11 with pid %d, parent pid %d.\n",getpid(),getppid());

while ((p21=fork())==-1);

if (!p21) {

printf("child21 with pid %d, parent pid %d.\n",getpid(),getppid());

exit(0);

}

else

wait(0);

while ((p22=fork())==-1);

if (!p22) {

printf("child22 with pid %d, parent pid %d.\n",getpid(),getppid());

exit(0);

}

else

wait(0);

exit(0);

}

else

wait(0);

while ((p12=fork())==-1);

if (!p12) {

printf("child12 with pid %d, parent pid %d.\n",getpid(),getppid());

exit(0);

}

else

wait(0);

while ((p13=fork())==-1);

if (!p13) {

printf("child13 with pid %d, parent pid %d.\n",getpid(),getppid());

exit(0);

}

else

wait(0);

exit(0);

}

else

wait(0);

return 0;

}

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