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hidehiko authored
In libevent, socketpair() is used. However, it will be prohibited by seccomp-bpf in nacl_helper_nonsfi. As its preparation, this CL stubs out signal.c, which is the only module calling socketpair(). TEST=Ran bots. BUG=358417 CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:linux_chromium_trusty32_rel,linux_arm TBR=darin@chromium.org Review URL: https://codereview.chromium.org/1093113002 Cr-Commit-Position: refs/heads/master@{#327213}
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