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Unix Version 7 - man page for indir (v7 section 2)

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INDIR(2)										 INDIR(2)

       indir - indirect system call

       (indir = 0.)
       sys indir; call

       The system call at the location call is executed.  Execution resumes after the indir call.

       The  main  purpose  of  indir is to allow a program to store arguments in system calls and
       execute them out of line in the data segment.  This preserves the purity of the text  seg-

       If  indir is executed indirectly, it is a no-op.  If the instruction at the indirect loca-
       tion is not a system call, indir returns error code EINVAL; see intro(2).

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