20 lines
765 B
Markdown
20 lines
765 B
Markdown
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This directory contains the libc core: functions here may depend on other
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libc functions _only_ (so, no `unistd.h` stuff). Plats don't get to configure
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this, so nothing here should add any overhead if the function isn't linked.
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Examples of what goes here:
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- `strcmp()` --- because it's pure code.
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- `setjmp()` --- in EM, it's portable.
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- `assert()` --- because it only calls other core functions (`fputs()`
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and `abort()`).
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Examples of what doesn't go here:
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- `malloc()` --- because it calls the `unistd.h` function `sbrk()` (and so a
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plat might want to swap it out).
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- stdio --- because it calls the `unistd.h` functions `read()`, `write()`
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etc.
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- `signal()` --- because it can't be implemented portably and needs to go
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in the plat.
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