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Thu, 01 Oct 2020 08:50:04 -0700 (PDT) From: Alejandro Colomar To: mtk.manpages@gmail.com Cc: Alejandro Colomar , linux-man@vger.kernel.org, gcc@gcc.gnu.org, libc-alpha@sourceware.org Subject: [PATCH v2 1/2] system_data_types.7: Add 'void *' Date: Thu, 1 Oct 2020 17:49:46 +0200 Message-Id: <20201001154946.104626-2-colomar.6.4.3@gmail.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <41affebd-3354-9420-0048-bffd14535e95@gmail.com> References: <41affebd-3354-9420-0048-bffd14535e95@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org Signed-off-by: Alejandro Colomar --- man7/system_data_types.7 | 47 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 45 insertions(+), 2 deletions(-) diff --git a/man7/system_data_types.7 b/man7/system_data_types.7 index e42cf2557..e545aa1a0 100644 --- a/man7/system_data_types.7 +++ b/man7/system_data_types.7 @@ -679,7 +679,6 @@ See also the .I uintptr_t and .I void * -.\" TODO: Document void * types in this page. .RE .\"------------------------------------- lconv ------------------------/ @@ -1781,7 +1780,6 @@ See also the .I intptr_t and .I void * -.\" TODO: Document void * types in this page. .RE .\"------------------------------------- va_list ----------------------/ @@ -1815,6 +1813,51 @@ See also: .BR va_copy (3), .BR va_end (3) .RE +.\"------------------------------------- void * -----------------------/ +.TP +.I void * +.RS +According to the C language standard, +a pointer to any object type may be converted to a pointer to +.I void +and back. +POSIX further requires that any pointer, +including pointers to functions, +may be converted to a pointer to +.I void +and back. +.PP +Conversions from and to any other pointer type are done implicitly, +not requiring casts at all. +.PP +A value of this type can't be dereferenced, +as it would give a value of type +.I void +which is not possible. +.PP +The conversion specifier for +.I void * +for the +.BR printf (3) +and the +.BR scanf (3) +families of functions is +.BR p ; +resulting commonly in +.B %p +for printing +.I void * +values. +.PP +Conforming to: +C99 and later; POSIX.1-2001 and later. +.PP +See also the +.I intptr_t +and +.I uintptr_t +types in this page. +.RE .\"--------------------------------------------------------------------/ .SH NOTES The structures described in this manual page shall contain, -- 2.28.0