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Editorial Team
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Asked: 2026-05-28T04:19:55+00:00

The man page says: fgets() return s on success, and NULL on error or

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The man page says:

fgets() return s on success, and NULL on error or when end of file occurs while no characters have been read.

I wrote a small C file which calls fgets to test its behavior. I particularly wanted to see what happens when EOF occurs after some characters have been inputted. I used the eof key combination (Ctrl+D) on bash. I had to press Ctrl+D twice for fgets to return. It printed out the characters inputted until I pressed Ctrl+D twice. Pressing Ctrl+D once after some characters had been inputted had no effect at all. If I inputted some characters after this they were stored in the passed array. Why does fgets behave this way?

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1 Answer

  1. Editorial Team

    The behavior you describe has nothing to do with fgets. The shell does not close the input stream until you press ctrl-D the 2nd time.

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