Strategies for finding binary dependencies
add cffi example
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contrib/cffi/REUSE.toml
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contrib/cffi/REUSE.toml
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contrib/cffi/abi.py
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contrib/cffi/abi.py
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# © NONE
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# SPDX-License-Identifier: CC0-1.0
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from cffi import FFI
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ffi = FFI()
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ffi.cdef("""
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int printf(const char *format, ...); // copy-pasted from the man page
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""")
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C = ffi.dlopen(None) # loads the entire C namespace
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arg = ffi.new("char[]", b"world") # equivalent to C code: char arg[] = "world";
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C.printf(b"hi there, %s.\n", arg) # call printf
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contrib/cffi/api.py
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contrib/cffi/api.py
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# © NONE
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# SPDX-License-Identifier: CC0-1.0
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from cffi import FFI
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ffibuilder = FFI()
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ffibuilder.set_source("_example",
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r""" // passed to the real C compiler,
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// contains implementation of things declared in cdef()
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#include <sys/types.h>
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#include <pwd.h>
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// We can also define custom wrappers or other functions
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// here (this is an example only):
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static struct passwd *get_pw_for_root(void) {
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return getpwuid(0);
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}
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""",
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libraries=[]) # or a list of libraries to link with
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# (more arguments like setup.py's Extension class:
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# include_dirs=[..], extra_objects=[..], and so on)
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ffibuilder.cdef("""
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// declarations that are shared between Python and C
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struct passwd {
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char *pw_name;
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...; // literally dot-dot-dot
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};
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struct passwd *getpwuid(int uid); // defined in <pwd.h>
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struct passwd *get_pw_for_root(void); // defined in set_source()
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""")
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if __name__ == "__main__":
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ffibuilder.compile(verbose=True)