To use tprof for micro-profiling, the application must be linked and compiled with the -g debug flag.
要想使用tprof执行微剖析，应用程序在编译和链接时必须使用—g调试标志。
Sendmail checked that "debug flag" values weren't larger than the legal value, but it didn't check if the number was negative.
sendmail会检查“调试标记”是不是比合法的值大，但是它并没有去检查这个值是不是负数。
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