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59 lines
878 B
59 lines
878 B
#include <ulib.h>
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#include <stdio.h>
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void
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do_yield(void) {
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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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}
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int parent, pid1, pid2;
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void
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loop(void) {
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cprintf("child 1.\n");
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while (1);
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}
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void
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work(void) {
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cprintf("child 2.\n");
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do_yield();
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if (kill(parent) == 0) {
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cprintf("kill parent ok.\n");
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do_yield();
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if (kill(pid1) == 0) {
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cprintf("kill child1 ok.\n");
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exit(0);
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}
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}
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exit(-1);
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}
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int
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main(void) {
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parent = getpid();
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if ((pid1 = fork()) == 0) {
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loop();
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}
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assert(pid1 > 0);
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if ((pid2 = fork()) == 0) {
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work();
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}
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if (pid2 > 0) {
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cprintf("wait child 1.\n");
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waitpid(pid1, NULL);
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panic("waitpid %d returns\n", pid1);
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}
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else {
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kill(pid1);
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}
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panic("FAIL: T.T\n");
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}
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