#include“pctl.h“

int??main（?）{
signal（SIGINT（sighandler_t）sigcat）;
char?*argsa[]={“/bin/pwd“NULLNULL};
int?i;
int?pida;//childa‘s?pid
int?pidb;//childb‘s??pid
int?statusa;//childa‘s?status
int?statusb;//childb‘s?status
while（1）{
if（（pida=fork（））==0）{
pause（）;
printf（“%dChilda:?This?is?childa?running?\n“getpid（））;
printf（“%dChilda:?My?pid?is?%d\n“getpid（））;
printf（“%dChilda:?My?father‘s?pid?is?%d\n“getpid（）getppid（））;
statusa=execve（argsa[0]argsaNULL）;

}
else?{
pidb=fork（）;
if（pidb<0）{
printf（“Create?process?pidb?fail\n“）;
exit（EXIT_FAILURE）;
}
else?if（pidb==0）{

pause（）;
printf（“%dChildb:?This?is?childb?running?\n“getpid（））;
printf（“%dChildb:?My?pid?is?%d\n“getpid（））;
printf（“%dChildb:?My?father‘s?pid?is?%d\n“getpid（）getppid（））;
statusb=execve（“/bin/ls“NULLNULL）;
}


else?{

printf（“%dFather:?This?is?father?running?\n“getpid（））;
printf（“%dFather:?My?pid?is?%d\n?“getpid（）getpid（））;
if（kill（pidaSIGINT）>=0）{
waitpid（pida&statusa0）;
sleep（3）;
printf（“%dFather:?Child

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?-rw-rw-r--??????1163??2010-04-07?20:42??exp1\pctl.c

?-rw-rw-r--??????6688??2010-04-07?20:05??exp1\pctl.o

?-rwxrwxr-x?????10859??2010-04-07?20:05??exp1\pctl

?-rw-rw-r--???????170??2010-04-05?22:52??exp1\Makefile

?-rw-rw-r--???????185??2010-04-05?22:37??exp1\pctl.h

?drwxrwxr-x?????????0??2010-05-25?12:00??exp1

-----------?---------??----------?-----??----

????????????????19065????????????????????6