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sigprocmask.2: RETURN VALUE: mention that 'errno' is set on error
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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.\"
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.\" 2005-09-15, mtk, Created new page by splitting off from sigaction.2
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.\"
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.TH SIGPROCMASK 2 2012-04-15 "Linux" "Linux Programmer's Manual"
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.TH SIGPROCMASK 2 2013-04-19 "Linux" "Linux Programmer's Manual"
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.SH NAME
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sigprocmask \- examine and change blocked signals
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.SH SYNOPSIS
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@ -93,6 +93,9 @@ is unspecified in a multithreaded process; see
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.SH RETURN VALUE
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.BR sigprocmask ()
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returns 0 on success and \-1 on error.
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In the event of an error,
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.I errno
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is set to indicate the cause.
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.SH ERRORS
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.TP
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.B EFAULT
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