John, if you are playing with C subroutines and you don't need anything fancy from the C library, try out the METALC option of the C compiler. It generates HLASM code that you then assemble into a load module, so you get to see real assembler calling the METALC equivalents of the C library functions.
Most of the more complex METALC functions are loaded in (I think) LPA/ELPA or somewhere resident anyway and are accessed via a z/OS-resident vector list, so they (usually) don't get linked in. Some functions are implemented with generated inline code (like memcpy). Plus using the OPT, ARCH and TUNE compiler parameters allows you to take advantage of the C compiler's optimization code, including some pretty cool AGI (address generation interlock) avoidance. Only a subset of C library functions are supported by METALC, but they are generally the most useful ones. HTH Peter > -----Original Message----- > From: IBM Mainframe Assembler List [mailto:ASSEMBLER- > l...@listserv.uga.edu] On Behalf Of McKown, John > Sent: Friday, October 14, 2011 9:33 AM > To: ASSEMBLER-LIST@LISTSERV.UGA.EDU > Subject: Need simple example - Calling c subroutine like printf from HLASM > program > > I know that I've seen somebody do this before. But I cannot remember how > they did it. Does anybody have a code snippet that shows how to call a C > subroutine like sprintf() or strncmp() from HLASM? Also the compile & link > JCL would be appreciated. I've tried reading the LE manuals and the C > manuals, but I'm just not finding it. -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system.
