[Bug libc/18124] New: hppa: setcontext erroneously returns -1 as exit code for last constant.

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18124

            Bug ID: 18124
           Summary: hppa: setcontext erroneously returns -1 as exit code
                    for last constant.
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: carlos at redhat dot com
                CC: drepper.fsp at gmail dot com

The hppa implementation of setcontext had several flaws:

* It called _exit instead of exit, avoiding the registered exit handlers that
should be run. The standard says nothing about avoiding them.

* It should use HIDDEN_JUMPTARGET(exit) to avoid a PLT slot usage.

* It should call __sigprocmask to avoid another PLT slot usage.

* it should return 0 as the exit code when the last linked-to context
completes.

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