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fault-inject: add /proc/<pid>/fail-nth

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fail-nth interface is only created in /proc/self/task/<current-tid>/.
This change also adds it in /proc/<pid>/.

This makes shell based tool a bit simpler.

	$ bash -c "builtin echo 100 > /proc/self/fail-nth && exec ls /"

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Akinobu Mita <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Akinobu Mita 2017-07-14 14:50:00 -07:00 • committed by Linus Torvalds
commit 168c42bc56
2 changed files with 3 additions and 1 deletions
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3
Documentation/fault-injection/fault-injection.txt
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@ -136,7 +136,8 @@ use the boot option:
o proc entries
- /proc/self/task/<current-tid>/fail-nth:
- /proc/<pid>/fail-nth:
- /proc/self/task/<tid>/fail-nth:
Write to this file of integer N makes N-th call in the task fail.
Read from this file returns a integer value. A value of '0' indicates