1FETCHI(2)                     System Calls Manual                    FETCHI(2)
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NAME

6       fetchi - fetch from user instruction space (2BSD)
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SYNOPSIS

9       fetchi(addr)
10       int *addr;
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DESCRIPTION

13       Fetchi  fetches  the  word at addr from the caller's instruction space.
14       This system call is required on PDP-11's with separate instruction  and
15       data spaces because the mfpi instruction reads from D-space if the cur‐
16       rent and previous modes in the program status word are both user.
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RETURN VALUE

19       Upon successful completion the contents  of  the  caller's  instruction
20       space at addr are returned.  Otherwise, a value of -1 is returned.
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ERRORS

23       [EINVAL]       The  kernel  has  not been compiled for a processor with
24                      separate I/D.
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26       [EFAULT]       Addr points to an address not in the process's allocated
27                      instruction space.
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BUGS

30       The  error  indication, -1, is a legitimate function value; errno, (see
31       intro(2)), can be used to disambiguate.
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33       Fetchi is a kludge and exists only to circumvent  an  alleged  security
34       feature on some DEC PDP-11 processors.
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36       Fetchi is unique to the PDP-11 and 2BSD; its use is discouraged.
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403rd Berkeley Distribution      January 22, 1987                      FETCHI(2)