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  3. November 2005

Re: _C_IFS_fopen



The mapping between the C Library Functions and the AS/400 runtime
implementation is documented for the IFS functions in the QSYSINC/H file,
member IFS:
Technically, it's split across the STDIO member and the IFS member. In the STDIO member, you'll see: 

  #ifdef __IFS_IO__
     #include <ifs.h>

  #endif  /* ifdef __IFS_IO__  */
So that code causes it to only use the IFS member if __IFS_IO__ is defined (which is defined by setting SYSIFCOPT(*IFSIO) on the CRTCMOD or CRTBNDC command)
In that same member (STDIO) you'll see that it also maps fopen() to something else when __IFS_IO__ is not defined.

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