io_readfile(3) - Linux man page
Name
io_readfile - open a file for readingSyntax
#include <io.h>int io_readfile(int64* d,const char* s);
Description
io_readfile sets d to the number of a new descriptor reading from the disk file named s, and returns 1.If something goes wrong, io_readfile sets errno to indicate the error, and returns 0; it does not create a new descriptor, and it does not touch d.