opt: avoid spawn null cmd
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@@ -6104,6 +6104,10 @@ void setup(void) {
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}
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void spawn(const Arg *arg) {
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if(!arg->v)
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return;
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if (fork() == 0) {
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// 1. 忽略可能导致 coredump 的信号
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signal(SIGSEGV, SIG_IGN);
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