You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
|
|
|
|
#include <common.h>
|
|
|
|
|
|
|
|
|
|
void child(int id)
|
|
|
|
|
{
|
|
|
|
|
int i;
|
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
|
|
|
printf("hello from %d\n", id);
|
|
|
|
|
}
|
|
|
|
|
exit(id);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int main(int argc, char **argv)
|
|
|
|
|
{
|
|
|
|
|
int pid = 0;
|
|
|
|
|
int id = 0;
|
|
|
|
|
while (id < 100) {
|
|
|
|
|
pid = fork();
|
|
|
|
|
id++;
|
|
|
|
|
if (!pid)
|
|
|
|
|
child(id);
|
|
|
|
|
//if (wait(NULL) != pid)
|
|
|
|
|
// errx(-1, "wrong pid %d", pid);
|
|
|
|
|
if (wait4(pid, NULL, 0, NULL) != pid)
|
|
|
|
|
errx(-1, "wrong pid %d", pid);
|
|
|
|
|
if (wait4(pid - 1, NULL, 0, NULL) > 0)
|
|
|
|
|
errx(-1, "wait4 should fail");
|
|
|
|
|
if (wait(NULL) > 0)
|
|
|
|
|
errx(-1, "wait should fail");
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
printf("parent done!\n");
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
