Purego – A library for calling C functions from Go without Cgo

Re:Purego – A library for calling C functions from Go withou... by totallygamerjet on Sunday February 12, 2023 @12:09PM (#34764526)

It’s pretty simple to use if you are familiar with dlopen and friends.

Just call purego.Dlopen(“libname.so”, purego.RTLD_GLOBAL)

Take the returned library (make sure to check for errors with purego.Dlerror() first) and call purego.Dlsym(lib, “cfuncName”). If it exists than u can call it with either purego.SyscallN or purego.RegisterFunc

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Re:Purego – A library for calling C functions from Go withou... by mook on Monday February 13, 2023 @01:51AM (#34770850)

It would be good to have more documentation on usage, though; things like how to deal with struct padding (or packed structs), common OS API types (presumably manual munging of UCS2/UTF16 is needed for Windows), etc; at least to mention that it's unchanged from …/x/sys?

It's easier with dlopen because it's still C and therefore you have the normal headers…

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Re:Purego – A library for calling C functions from Go withou... by mkm40 on Monday February 13, 2023 @02:10AM (#34770945)

+1 for additional examples or documentation.

Particularly an example that takes a c struct pointer would be awesome.

What happens to const char* return values that are null ? I think it is empty string, but either test case or doc confirming it would be awesome

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