1SYS_SIGPENDING(9) Driver Basics SYS_SIGPENDING(9)
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6 sys_sigpending - examine pending signals
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9 long sys_sigpending(old_sigset_t __user * set);
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12 set
13 where mask of pending signal is returned
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16Kernel Hackers Manual 3.10 June 2019 SYS_SIGPENDING(9)