Will using tcgetattr can get terminal attributes, but has not been able to set tcsetattr settings are incorrect , an error is returned 5, I / O error, please heroes help solve ! !

Will using tcgetattr can get terminal attributes, but has not been successful tcsetattr settings are incorrect , an error is returned 5, I / O error, please help to solve ! ! get set immediately after no changes have not been successful .
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landlord , the code !
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Thank you, this problem has been solved, is the session , foreground process group and the relationship between the background process group .
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the landlord is how to solve ?
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landlord landlord, you are how to solve ah ?