sys_sigprocmask
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## Name

sys_sigprocmask — examine and change blocked signals

## Synopsis

`long sys_sigprocmask (` | int how,
| old_sigset_t __user * nset,
| old_sigset_t __user * oset`)`;

## Arguments

`how`

  whether to add, remove, or set signals

`nset`

  signals to add or remove (if non-null)

`oset`

  previous value of signal mask if non-null

## Description

Some platforms have their own version with special arguments; others support only sys_rt_sigprocmask.

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