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Home/ Questions/Q 8498143
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Editorial Team
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Editorial Team
Asked: June 11, 20262026-06-11T00:19:18+00:00 2026-06-11T00:19:18+00:00

st_size is defined as being an off_t . off_t is defined as being a

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st_size is defined as being an off_t.

off_t is defined as being a signed integer type.

Why is st_size defined as a signed type? Can it be negative? What does it mean if it is negative?

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  1. Editorial Team
    Editorial Team
    2026-06-11T00:19:20+00:00Added an answer on June 11, 2026 at 12:19 am

    The best reason I can think of is to avoid introducing an unsigned version of off_t as an extra type; POSIX already has a ridiculous abundance of integer types with similar uses.

    Aside from that, being able to store -1 in st_size when size is not a concept that makes sense is probably useful; I’m not sure if any implementations do this, and I can’t find where POSIX puts any requirements on the contents of st_size except for regular files and symlinks…

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