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Subject[PATCH v2 4/7] linux/signal.h: Ignore SIGINFO by default in new tasks
This matches the behaviour of other Unix-like systems that have SIGINFO
and causes less harm to processes that do not install handlers for this
signal, making the keyboard status character non-fatal for them.

This is implemented with the assumption that SIGINFO is defined
to be equivalent to SIGPWR; still, there is no reason for PWR to
result in termination of the signal recipient anyway — it does not
indicate there is a fatal problem with the recipient's execution
context (like e.g. FPE/ILL do), and we have TERM/KILL for explicit
termination requests.

Signed-off-by: Arseny Maslennikov <ar@cs.msu.ru>
---
include/linux/signal.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/signal.h b/include/linux/signal.h
index 9702016734b1..c365754ea647 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -360,7 +360,7 @@ extern bool unhandled_signal(struct task_struct *tsk, int sig);
* | SIGSYS/SIGUNUSED | coredump |
* | SIGSTKFLT | terminate |
* | SIGWINCH | ignore |
- * | SIGPWR | terminate |
+ * | SIGPWR | ignore |
* | SIGRTMIN-SIGRTMAX | terminate |
* +--------------------+------------------+
* | non-POSIX signal | default action |
@@ -411,7 +411,8 @@ extern bool unhandled_signal(struct task_struct *tsk, int sig);

#define SIG_KERNEL_IGNORE_MASK (\
rt_sigmask(SIGCONT) | rt_sigmask(SIGCHLD) | \
- rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) )
+ rt_sigmask(SIGWINCH) | rt_sigmask(SIGURG) | \
+ rt_sigmask(SIGINFO) )

#define SIG_SPECIFIC_SICODES_MASK (\
rt_sigmask(SIGILL) | rt_sigmask(SIGFPE) | \
--
2.20.1
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