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Diffstat (limited to 'unix/os/doc/zlocpr.hlp')
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diff --git a/unix/os/doc/zlocpr.hlp b/unix/os/doc/zlocpr.hlp new file mode 100644 index 00000000..6136d34b --- /dev/null +++ b/unix/os/doc/zlocpr.hlp @@ -0,0 +1,35 @@ +.help zlocpr May84 "System Interface" +.ih +NAME +zlocpr -- get the entry point address of a procedure +.ih +SYNOPSIS +.nf +zlocpr (procedure, address) + +extern procedure() # external procedure +int address # address of the procedure +.fi +.ih +DESCRIPTION +The entry point address (EPA) of \fIprocedure\fR is returned in the integer +variable or integer array element \fIaddress\fR. +.ih +RETURN VALUE +The EPA of a procedure is a magic integer value. Two EPA values may be +compared for equality to determine if they refer to the same procedure, +and a procedure referenced by an EPA may be executed by passing the EPA +and any arguments to a \fBzcall\fR primitive. +.ih +NOTES +A legal EPA may not have the value NULL, which is reserved for flagging +uninitialized EPA variables. The Fortran 77 alternate return from subroutine +feature may not be used with \fBzlocpr\fR and \fBzcall\fR because it involves +an extra hidden argument on some systems. The alternate return feature is +inadvisable for other reasons as well and is forbidden in SPP programs. +Only untyped procedures are permitted, i.e., \fBzlocpr\fR may not be used +with functions. +.ih +SEE ALSO +zcall, zlocva +.endhelp |