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25 lines
921 B
C
25 lines
921 B
C
/* tools/linuxfs/preload/subreaper.c
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*
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* Mark every process that loads libblsession.so as a child subreaper.
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*
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* wlroots starts Xwayland with a double fork: gamescope -> middle process
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* (exits immediately) -> Xwayland. With no subreaper in the tree, Xwayland
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* is reparented to pid 1 and becomes an orphan. On some vendor kernels
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* (observed on Meizu / Flyme 12) an orphan reaper SIGKILLs it in that window,
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* which makes gamescope wait forever in wlserver_init() and the UI hangs on
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* "Starting display and audio".
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*
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* With PR_SET_CHILD_SUBREAPER the reparent target becomes the nearest marked
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* ancestor instead of init, so the orphan event never happens.
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*
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* Harmless for processes that do not fork, and cheap (one syscall at load).
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*/
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#define _GNU_SOURCE
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#include <sys/prctl.h>
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__attribute__((constructor))
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static void bl_session_set_subreaper(void)
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{
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(void)prctl(PR_SET_CHILD_SUBREAPER, 1);
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}
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