debian man page for io_readwritefile

io_readwritefile(3)					     Library Functions Manual					       io_readwritefile(3)

NAME
       io_readfile - open a file for reading and writing

SYNTAX
       #include <io.h>

       int io_readwritefile(int64* d,const char* s);

DESCRIPTION
       io_readwritefile sets d to the number of a new descriptor reading from and writing to the disk file named s, and returns 1.  The file needs
       to exist.

       If something goes wrong, io_readwritefile sets errno to indicate the error, and returns 0; it does not create a new descriptor, and it does
       not touch d.

SEE ALSO
       io_readfile(3), io_createfile(3), io_appendfile(3)

															       io_readwritefile(3)