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isalpha.3: ATTRIBUTES: Note functions that are thread-safe
The functions isalnum(), isalpha(), isascii(), isblank(), iscntrl(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isupper() and isxdigit() are thread safe. Signed-off-by: Peng Haitao <penght@cn.fujitsu.com> Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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.\" Modified Sat Sep 2 21:52:01 1995 by Jim Van Zandt <jrv@vanzandt.mv.com>
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.\" Modified Sat Sep 2 21:52:01 1995 by Jim Van Zandt <jrv@vanzandt.mv.com>
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.\" Modified Mon May 27 22:55:26 1996 by Martin Schulze (joey@linux.de)
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.\" Modified Mon May 27 22:55:26 1996 by Martin Schulze (joey@linux.de)
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.\"
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.\"
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.TH ISALPHA 3 2010-09-20 "GNU" "Linux Programmer's Manual"
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.TH ISALPHA 3 2014-01-27 "GNU" "Linux Programmer's Manual"
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.SH NAME
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.SH NAME
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isalnum, isalpha, isascii, isblank, iscntrl, isdigit, isgraph, islower,
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isalnum, isalpha, isascii, isblank, iscntrl, isdigit, isgraph, islower,
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isprint, ispunct, isspace, isupper, isxdigit \- character
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isprint, ispunct, isspace, isupper, isxdigit \- character
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@ -162,6 +162,24 @@ The values returned are nonzero if the character
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.I c
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.I c
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falls into the tested class, and a zero value
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falls into the tested class, and a zero value
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if not.
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if not.
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.SH ATTRIBUTES
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.SS Multithreading (see pthreads(7))
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The
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.BR isalnum (),
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.BR isalpha (),
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.BR isascii (),
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.BR isblank (),
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.BR iscntrl (),
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.BR isdigit (),
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.BR isgraph (),
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.BR islower (),
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.BR isprint (),
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.BR ispunct (),
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.BR isspace (),
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.BR isupper (),
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and
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.BR isxdigit ()
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functions are thread-safe.
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.SH CONFORMING TO
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.SH CONFORMING TO
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C99, 4.3BSD.
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C99, 4.3BSD.
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C89 specifies all of these functions except
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C89 specifies all of these functions except
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