application bug:has SIGCHLD set to SIG_IGN but calls wait()
2011-02-22 10:27
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在一台Linux机器的系统日志会见到如下错误日志：
kernel: application bug: 程序名(行号) has SIGCHLD set to SIG_IGN but calls wait()
通常SIGCHLD信号是在子进程结束时，内核向父进程发送的信号，正常情况下，父进程调用wait函数收集子进程的状态信息，释放子进程资源。
对于一些并发服务器，常常fork很多子进程，为了省事，直接将此SIGCHLD信号的处理方式设为忽略，可让内核把僵尸子进程转交给init进程去处理，省去了大量僵尸进程占用系统资源。如果在这种情况下，仍然调用wait就会产生此错误.
kernel: application bug: 程序名(行号) has SIGCHLD set to SIG_IGN but calls wait()
通常SIGCHLD信号是在子进程结束时，内核向父进程发送的信号，正常情况下，父进程调用wait函数收集子进程的状态信息，释放子进程资源。
对于一些并发服务器，常常fork很多子进程，为了省事，直接将此SIGCHLD信号的处理方式设为忽略，可让内核把僵尸子进程转交给init进程去处理，省去了大量僵尸进程占用系统资源。如果在这种情况下，仍然调用wait就会产生此错误.
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