Using the POSIX library functions

In contrast to developing programs in the BS2000 environment (SDF), no special provisions are required for using the POSIX library functions in the POSIX environment. The following actions are executed automatically:

• Setzen des Präprozessor-Defines _OSD_POSIX

• merging in the standard header files supplied with CRTE and POSIX-HEADER from the standard directories /usr/include or /usr/include/sys. These depend on the language mode:

  language mode	searched directories
  all C modes	/usr/include /usr/include/sys
  Cfront C++	/usr/include /usr/include/sys
  C++ V3	/usr/include/CC /usr/include /usr/include/sys
  C++ 2017 / C++ 2020 library version 1	/usr/include/CXX01 /usr/include /usr/include/sys
  C++ 2017 / C++ 2020 library version 2	/usr/include/CXX02 /usr/include /usr/include/sys

  The default setting can be overwritten by specifying -Y -I.

• linking in the POSIX link switches posix.o and postime.o (corresponds to the PLAM library SYSLNK.CRTE.POSIX in the BS2000 environment)

The PROGRAM-ENVIRONMENT variable is set to “Shell” when the program is started.

Please refer to the manual “C Library Functions for POSIX Applications” [2] for further details.