config.3

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

.IX Item "cppminus"
From \fIcppstdin.U\fR:
.Sp
This variable contains the second part of the string which will invoke
the C preprocessor on the standard input and produce to standard
output.  This variable will have the value \f(CW\*(C`\-\*(C'\fR if cppstdin needs
a minus to specify standard input, otherwise the value is "".
.ie n .IP """cpprun""" 4
.el .IP "\f(CWcpprun\fR" 4
.IX Item "cpprun"
From \fIcppstdin.U\fR:
.Sp
This variable contains the command which will invoke a C preprocessor
on standard input and put the output to stdout. It is guaranteed not
to be a wrapper and may be a null string if no preprocessor can be
made directly available. This preprocessor might be different from the
one used by the C compiler. Don't forget to append cpplast after the
preprocessor options.
.ie n .IP """cppstdin""" 4
.el .IP "\f(CWcppstdin\fR" 4
.IX Item "cppstdin"
From \fIcppstdin.U\fR:
.Sp
This variable contains the command which will invoke the C
preprocessor on standard input and put the output to stdout.
It is primarily used by other Configure units that ask about
preprocessor symbols.
.ie n .IP """cppsymbols""" 4
.el .IP "\f(CWcppsymbols\fR" 4
.IX Item "cppsymbols"
From \fICppsym.U\fR:
.Sp
The variable contains the symbols defined by the C preprocessor
alone.  The symbols defined by cc or by cc when it calls cpp are
not in this list, see ccsymbols and cppccsymbols.
The list is a space-separated list of symbol=value tokens.
.ie n .IP """crypt_r_proto""" 4
.el .IP "\f(CWcrypt_r_proto\fR" 4
.IX Item "crypt_r_proto"
From \fId_crypt_r.U\fR:
.Sp
This variable encodes the prototype of crypt_r.
It is zero if d_crypt_r is undef, and one of the
\&\f(CW\*(C`REENTRANT_PROTO_T_ABC\*(C'\fR macros of \fIreentr.h\fR if d_crypt_r
is defined.
.ie n .IP """cryptlib""" 4
.el .IP "\f(CWcryptlib\fR" 4
.IX Item "cryptlib"
From \fId_crypt.U\fR:
.Sp
This variable holds \-lcrypt or the path to a \fIlibcrypt.a\fR archive if
the \fIcrypt()\fR function is not defined in the standard C library. It is
up to the Makefile to use this.
.ie n .IP """csh""" 4
.el .IP "\f(CWcsh\fR" 4
.IX Item "csh"
From \fILoc.U\fR:
.Sp
This variable is used internally by Configure to determine the
full pathname (if any) of the csh program.  After Configure runs,
the value is reset to a plain \f(CW\*(C`csh\*(C'\fR and is not useful.
.ie n .IP """ctermid_r_proto""" 4
.el .IP "\f(CWctermid_r_proto\fR" 4
.IX Item "ctermid_r_proto"
From \fId_ctermid_r.U\fR:
.Sp
This variable encodes the prototype of ctermid_r.
It is zero if d_ctermid_r is undef, and one of the
\&\f(CW\*(C`REENTRANT_PROTO_T_ABC\*(C'\fR macros of \fIreentr.h\fR if d_ctermid_r
is defined.
.ie n .IP """ctime_r_proto""" 4
.el .IP "\f(CWctime_r_proto\fR" 4
.IX Item "ctime_r_proto"
From \fId_ctime_r.U\fR:
.Sp
This variable encodes the prototype of ctime_r.
It is zero if d_ctime_r is undef, and one of the
\&\f(CW\*(C`REENTRANT_PROTO_T_ABC\*(C'\fR macros of \fIreentr.h\fR if d_ctime_r
is defined.
.Sh "d"
.IX Subsection "d"
.ie n .IP """d_\|_fwalk""" 4
.el .IP "\f(CWd_\|_fwalk\fR" 4
.IX Item "d__fwalk"
From \fId_\|_fwalk.U\fR:
.Sp
This variable conditionally defines \f(CW\*(C`HAS_\|_FWALK\*(C'\fR if \fI_fwalk()\fR is
available to apply a function to all the file handles.
.ie n .IP """d_access""" 4
.el .IP "\f(CWd_access\fR" 4
.IX Item "d_access"
From \fId_access.U\fR:
.Sp
This variable conditionally defines \f(CW\*(C`HAS_ACCESS\*(C'\fR if the \fIaccess()\fR system
call is available to check for access permissions using real IDs.
.ie n .IP """d_accessx""" 4
.el .IP "\f(CWd_accessx\fR" 4
.IX Item "d_accessx"
From \fId_accessx.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HAS_ACCESSX\*(C'\fR symbol, which
indicates to the C program that the \fIaccessx()\fR routine is available.
.ie n .IP """d_aintl""" 4
.el .IP "\f(CWd_aintl\fR" 4
.IX Item "d_aintl"
From \fId_aintl.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HAS_AINTL\*(C'\fR symbol, which
indicates to the C program that the \fIaintl()\fR routine is available.
If copysignl is also present we can emulate modfl.
.ie n .IP """d_alarm""" 4
.el .IP "\f(CWd_alarm\fR" 4
.IX Item "d_alarm"
From \fId_alarm.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HAS_ALARM\*(C'\fR symbol, which
indicates to the C program that the \fIalarm()\fR routine is available.
.ie n .IP """d_archlib""" 4
.el .IP "\f(CWd_archlib\fR" 4
.IX Item "d_archlib"
From \fIarchlib.U\fR:
.Sp
This variable conditionally defines \f(CW\*(C`ARCHLIB\*(C'\fR to hold the pathname
of architecture-dependent library files for \f(CW$package\fR.  If
\&\f(CW$archlib\fR is the same as \f(CW$privlib\fR, then this is set to undef.
.ie n .IP """d_asctime_r""" 4
.el .IP "\f(CWd_asctime_r\fR" 4
.IX Item "d_asctime_r"
From \fId_asctime_r.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HAS_ASCTIME_R\*(C'\fR symbol,
which indicates to the C program that the \fIasctime_r()\fR
routine is available.
.ie n .IP """d_atolf""" 4
.el .IP "\f(CWd_atolf\fR" 4
.IX Item "d_atolf"
From \fIatolf.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HAS_ATOLF\*(C'\fR symbol, which
indicates to the C program that the \fIatolf()\fR routine is available.
.ie n .IP """d_atoll""" 4
.el .IP "\f(CWd_atoll\fR" 4
.IX Item "d_atoll"
From \fIatoll.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HAS_ATOLL\*(C'\fR symbol, which
indicates to the C program that the \fIatoll()\fR routine is available.
.ie n .IP """d_attribute_format""" 4
.el .IP "\f(CWd_attribute_format\fR" 4
.IX Item "d_attribute_format"
From \fId_attribut.U\fR:
.Sp
This variable conditionally defines \f(CW\*(C`HASATTRIBUTE_FORMAT\*(C'\fR, which
indicates the C compiler can check for printf-like formats.
.ie n .IP """d_attribute_malloc""" 4
.el .IP "\f(CWd_attribute_malloc\fR" 4
.IX Item "d_attribute_malloc"
From \fId_attribut.U\fR:
.Sp
This variable conditionally defines \f(CW\*(C`HASATTRIBUTE_MALLOC\*(C'\fR, which
indicates the C compiler can understand functions as having
malloc-like semantics.
.ie n .IP """d_attribute_nonnull""" 4
.el .IP "\f(CWd_attribute_nonnull\fR" 4
.IX Item "d_attribute_nonnull"
From \fId_attribut.U\fR:
.Sp
This variable conditionally defines \f(CW\*(C`HASATTRIBUTE_NONNULL\*(C'\fR, which
indicates that the C compiler can know that certain arguments
must not be \f(CW\*(C`NULL\*(C'\fR, and will check accordingly at compile time.
.ie n .IP """d_attribute_noreturn""" 4
.el .IP "\f(CWd_attribute_noreturn\fR" 4
.IX Item "d_attribute_noreturn"
From \fId_attribut.U\fR:
.Sp
This variable conditionally defines \f(CW\*(C`HASATTRIBUTE_NORETURN\*(C'\fR, which
indicates that the C compiler can know that certain functions
are guaranteed never to return.
.ie n .IP """d_attribute_pure""" 4
.el .IP "\f(CWd_attribute_pure\fR" 4
.IX Item "d_attribute_pure"
From \fId_attribut.U\fR:
.Sp
This variable conditionally defines \f(CW\*(C`HASATTRIBUTE_PURE\*(C'\fR, which
indicates that the C compiler can know that certain functions
are \f(CW\*(C`pure\*(C'\fR functions, meaning that they have no side effects, and
only rely on function input \fIand/or\fR global data for their results.
.ie n .IP """d_attribute_unused""" 4
.el .IP "\f(CWd_attribute_unused\fR" 4
.IX Item "d_attribute_unused"
From \fId_attribut.U\fR:
.Sp
This variable conditionally defines \f(CW\*(C`HASATTRIBUTE_UNUSED\*(C'\fR, which
indicates that the C compiler can know that certain variables
and arguments may not always be used, and to not throw warnings
if they don't get used.
.ie n .IP """d_attribute_warn_unused_result""" 4
.el .IP "\f(CWd_attribute_warn_unused_result\fR" 4
.IX Item "d_attribute_warn_unused_result"
From \fId_attribut.U\fR:
.Sp
This variable conditionally defines
\&\f(CW\*(C`HASATTRIBUTE_WARN_UNUSED_RESULT\*(C'\fR, which indicates that the C
compiler can know that certain functions have a return values
that must not be ignored, such as \fImalloc()\fR or \fIopen()\fR.
.ie n .IP """d_bcmp""" 4
.el .IP "\f(CWd_bcmp\fR" 4
.IX Item "d_bcmp"
From \fId_bcmp.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HAS_BCMP\*(C'\fR symbol if
the \fIbcmp()\fR routine is available to compare strings.
.ie n .IP """d_bcopy""" 4
.el .IP "\f(CWd_bcopy\fR" 4
.IX Item "d_bcopy"
From \fId_bcopy.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HAS_BCOPY\*(C'\fR symbol if
the \fIbcopy()\fR routine is available to copy strings.
.ie n .IP """d_bsd""" 4
.el .IP "\f(CWd_bsd\fR" 4
.IX Item "d_bsd"
From \fIGuess.U\fR:
.Sp
This symbol conditionally defines the symbol \f(CW\*(C`BSD\*(C'\fR when running on a
\&\f(CW\*(C`BSD\*(C'\fR system.
.ie n .IP """d_bsdgetpgrp""" 4
.el .IP "\f(CWd_bsdgetpgrp\fR" 4
.IX Item "d_bsdgetpgrp"
From \fId_getpgrp.U\fR:
.Sp
This variable conditionally defines \f(CW\*(C`USE_BSD_GETPGRP\*(C'\fR if
getpgrp needs one arguments whereas \f(CW\*(C`USG\*(C'\fR one needs none.
.ie n .IP """d_bsdsetpgrp""" 4
.el .IP "\f(CWd_bsdsetpgrp\fR" 4
.IX Item "d_bsdsetpgrp"
From \fId_setpgrp.U\fR:
.Sp
This variable conditionally defines \f(CW\*(C`USE_BSD_SETPGRP\*(C'\fR if
setpgrp needs two arguments whereas \f(CW\*(C`USG\*(C'\fR one needs none.
See also d_setpgid for a \f(CW\*(C`POSIX\*(C'\fR interface.
.ie n .IP """d_builtin_choose_expr""" 4
.el .IP "\f(CWd_builtin_choose_expr\fR" 4
.IX Item "d_builtin_choose_expr"
From \fId_builtin.U\fR:
.Sp
This conditionally defines \f(CW\*(C`HAS_BUILTIN_CHOOSE_EXPR\*(C'\fR, which
indicates that the compiler supports _\|_builtin_choose_expr(x,y,z).
This built-in function is analogous to the \f(CW\*(C`x?y:z\*(C'\fR operator in C,
except that the expression returned has its type unaltered by
promotion rules. Also, the built-in function does not evaluate
the expression that was not chosen.
.ie n .IP """d_builtin_expect""" 4
.el .IP "\f(CWd_builtin_expect\fR" 4
.IX Item "d_builtin_expect"
From \fId_builtin.U\fR:
.Sp
This conditionally defines \f(CW\*(C`HAS_BUILTIN_EXPECT\*(C'\fR, which indicates
that the compiler supports _\|_builtin_expect(exp,c).  You may use
_\|_builtin_expect to provide the compiler with branch prediction
information.
.ie n .IP """d_bzero""" 4
.el .IP "\f(CWd_bzero\fR" 4
.IX Item "d_bzero"
From \fId_bzero.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HAS_BZERO\*(C'\fR symbol if
the \fIbzero()\fR routine is available to set memory to 0.
.ie n .IP """d_c99_variadic_macros""" 4
.el .IP "\f(CWd_c99_variadic_macros\fR" 4
.IX Item "d_c99_variadic_macros"
From \fId_c99_variadic.U\fR:
.Sp
This variable conditionally defines the \s-1HAS_C99_VARIADIC_MACROS\s0
symbol, which indicates to the C program that C99 variadic macros
are available.
.ie n .IP """d_casti32""" 4
.el .IP "\f(CWd_casti32\fR" 4
.IX Item "d_casti32"
From \fId_casti32.U\fR:
.Sp
This variable conditionally defines \s-1CASTI32\s0, which indicates
whether the C compiler can cast large floats to 32\-bit ints.
.ie n .IP """d_castneg""" 4
.el .IP "\f(CWd_castneg\fR" 4
.IX Item "d_castneg"
From \fId_castneg.U\fR:
.Sp
This variable conditionally defines \f(CW\*(C`CASTNEG\*(C'\fR, which indicates
wether the C compiler can cast negative float to unsigned.
.ie n .IP """d_charvspr""" 4
.el .IP "\f(CWd_charvspr\fR" 4
.IX Item "d_charvspr"
From \fId_vprintf.U\fR:
.Sp
This variable conditionally defines \f(CW\*(C`CHARVSPRINTF\*(C'\fR if this system
has vsprintf returning type (char*).  The trend seems to be to
declare it as \*(L"int \fIvsprintf()\fR\*(R".
.ie n .IP """d_chown""" 4
.el .IP "\f(CWd_chown\fR" 4
.IX Item "d_chown"
From \fId_chown.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HAS_CHOWN\*(C'\fR symbol, which
indicates to the C program that the \fIchown()\fR routine is available.
.ie n .IP """d_chroot""" 4
.el .IP "\f(CWd_chroot\fR" 4
.IX Item "d_chroot"
From \fId_chroot.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HAS_CHROOT\*(C'\fR symbol, which
indicates to the C program that the \fIchroot()\fR routine is available.
.ie n .IP """d_chsize""" 4
.el .IP "\f(CWd_chsize\fR" 4
.IX Item "d_chsize"
From \fId_chsize.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`CHSIZE\*(C'\fR symbol, which
indicates to the C program that the \fIchsize()\fR routine is available
to truncate files.  You might need a \-lx to get this routine.
.ie n .IP """d_class""" 4
.el .IP "\f(CWd_class\fR" 4
.IX Item "d_class"
From \fId_class.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HAS_CLASS\*(C'\fR symbol, which
indicates to the C program that the \fIclass()\fR routine is available.
.ie n .IP """d_clearenv""" 4
.el .IP "\f(CWd_clearenv\fR" 4
.IX Item "d_clearenv"
From \fId_clearenv.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HAS_CLEARENV\*(C'\fR symbol, which
indicates to the C program that the clearenv () routine is available.
.ie n .IP """d_closedir""" 4
.el .IP "\f(CWd_closedir\fR" 4
.IX Item "d_closedir"
From \fId_closedir.U\fR:
.Sp
This variable conditionally defines \f(CW\*(C`HAS_CLOSEDIR\*(C'\fR if \fIclosedir()\fR is
available.
.ie n .IP """d_cmsghdr_s""" 4
.el .IP "\f(CWd_cmsghdr_s\fR" 4
.IX Item "d_cmsghdr_s"
From \fId_cmsghdr_s.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HAS_STRUCT_CMSGHDR\*(C'\fR symbol,
which indicates that the struct cmsghdr is supported.
.ie n .IP """d_const""" 4
.el .IP "\f(CWd_const\fR" 4
.IX Item "d_const"
From \fId_const.U\fR:
.Sp
This variable conditionally defines the \f(CW\*(C`HASCONST\*(C'\fR symbol, which
indicates to the C program that this C compiler knows about the
const type.
.ie n .IP """d_copysignl""" 4
.el .IP "\f(CWd_copysignl\fR" 4
.IX Item "d_copysignl"
From \fId_copysignl.U\fR: