os_kernel_lab/labcodes_answer/lab6_result/user/forktest.c

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2014-08-20 15:42:20 +08:00
#include <ulib.h>
#include <stdio.h>
const int max_child = 32;
int
main(void) {
int n, pid;
for (n = 0; n < max_child; n ++) {
if ((pid = fork()) == 0) {
cprintf("I am child %d\n", n);
exit(0);
}
assert(pid > 0);
}
if (n > max_child) {
panic("fork claimed to work %d times!\n", n);
}
for (; n > 0; n --) {
if (wait() != 0) {
panic("wait stopped early\n");
}
}
if (wait() == 0) {
panic("wait got too many\n");
}
cprintf("forktest pass.\n");
return 0;
}