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Add WaitStatus::PtraceSyscall for use with PTRACE_O_TRACESYSGOOD #566

Merged
merged 2 commits into from
Jul 21, 2017
Merged

Add WaitStatus::PtraceSyscall for use with PTRACE_O_TRACESYSGOOD #566

merged 2 commits into from
Jul 21, 2017

Commits on Jul 21, 2017

  1. Add WaitStatus::PtraceSyscall for use with PTRACE_O_TRACESYSGOOD 

    The recommended way to trace syscalls with ptrace is to set the
PTRACE_O_TRACESYSGOOD option, to distinguish syscall stops from
receiving an actual SIGTRAP. In C, this would cause WSTOPSIG to return
SIGTRAP | 0x80, but nix wants to parse that as an actual signal.

Add another wait status type for syscall stops (in the language of the
ptrace(2) manpage, "PTRACE_EVENT stops" and "Syscall-stops" are
different things), and mask out bit 0x80 from signals before trying to
parse it.

Closes nix-rust#550
    @geofft
    geofft committed Jul 21, 2017
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  2. Document WaitStatus and its variants

    @geofft
    geofft committed Jul 21, 2017
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