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34 行
708 B
34 行
708 B
#include <stdio.h>
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#include <ulib.h>
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int magic = -0x10384;
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int
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main(void) {
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int pid, code;
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cprintf("I am the parent. Forking the child...\n");
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if ((pid = fork()) == 0) {
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cprintf("I am the child.\n");
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yield();
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yield();
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yield();
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yield();
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yield();
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yield();
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yield();
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exit(magic);
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}
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else {
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cprintf("I am parent, fork a child pid %d\n",pid);
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}
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assert(pid > 0);
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cprintf("I am the parent, waiting now..\n");
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assert(waitpid(pid, &code) == 0 && code == magic);
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assert(waitpid(pid, &code) != 0 && wait() != 0);
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cprintf("waitpid %d ok.\n", pid);
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cprintf("exit pass.\n");
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return 0;
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}
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