config.pm

MSYS在windows下模拟了一个类unix的终端

If you have an fd_set typedef, but the dweebs who installed it did
a half-fast job and neglected to provide the macros to manipulate
an fd_set, C<HAS_FDS_BITS> will let us know how to fix the gaffe.

=item C<d_fgetpos>

From F<d_fgetpos.U>:

This variable conditionally defines C<HAS_FGETPOS> if fgetpos() is
available to get the file position indicator.

=item C<d_flexfnam>

From F<d_flexfnam.U>:

This variable conditionally defines the C<FLEXFILENAMES> symbol, which
indicates that the system supports filenames longer than 14 characters.

=item C<d_flock>

From F<d_flock.U>:

This variable conditionally defines C<HAS_FLOCK> if flock() is
available to do file locking.

=item C<d_fork>

From F<d_fork.U>:

This variable conditionally defines the C<HAS_FORK> symbol, which
indicates to the C program that the fork() routine is available.

=item C<d_fpathconf>

From F<d_pathconf.U>:

This variable conditionally defines the C<HAS_FPATHCONF> symbol, which
indicates to the C program that the pathconf() routine is available
to determine file-system related limits and options associated
with a given open file descriptor.

=item C<d_fpos64_t>

From F<d_fpos64_t.U>:

This symbol will be defined if the C compiler supports fpos64_t.

=item C<d_frexpl>

From F<d_frexpl.U>:

This variable conditionally defines the C<HAS_FREXPL> symbol, which
indicates to the C program that the frexpl() routine is available.

=item C<d_fs_data_s>

From F<d_fs_data_s.U>:

This variable conditionally defines the C<HAS_STRUCT_FS_DATA> symbol,
which indicates that the struct fs_data is supported.

=item C<d_fseeko>

From F<d_fseeko.U>:

This variable conditionally defines the C<HAS_FSEEKO> symbol, which
indicates to the C program that the fseeko() routine is available.

=item C<d_fsetpos>

From F<d_fsetpos.U>:

This variable conditionally defines C<HAS_FSETPOS> if fsetpos() is
available to set the file position indicator.

=item C<d_fstatfs>

From F<d_fstatfs.U>:

This variable conditionally defines the C<HAS_FSTATFS> symbol, which
indicates to the C program that the fstatfs() routine is available.

=item C<d_fstatvfs>

From F<d_statvfs.U>:

This variable conditionally defines the C<HAS_FSTATVFS> symbol, which
indicates to the C program that the fstatvfs() routine is available.

=item C<d_fsync>

From F<d_fsync.U>:

This variable conditionally defines the C<HAS_FSYNC> symbol, which
indicates to the C program that the fsync() routine is available.

=item C<d_ftello>

From F<d_ftello.U>:

This variable conditionally defines the C<HAS_FTELLO> symbol, which
indicates to the C program that the ftello() routine is available.

=item C<d_ftime>

From F<d_ftime.U>:

This variable conditionally defines the C<HAS_FTIME> symbol, which indicates
that the ftime() routine exists.  The ftime() routine is basically
a sub-second accuracy clock.

=item C<d_Gconvert>

From F<d_gconvert.U>:

This variable holds what Gconvert is defined as to convert
floating point numbers into strings. It could be C<gconvert>
or a more C<complex> macro emulating gconvert with gcvt() or sprintf.
Possible values are:
d_Gconvert=C<gconvert((x),(n),(t),(b))>
d_Gconvert=C<gcvt((x),(n),(b))>
d_Gconvert=C<sprintf((b),F<%F<.>*g>,(n),(x))>

=item C<d_getcwd>

From F<d_getcwd.U>:

This variable conditionally defines the C<HAS_GETCWD> symbol, which
indicates to the C program that the getcwd() routine is available
to get the current working directory.

=item C<d_getespwnam>

From F<d_getespwnam.U>:

This variable conditionally defines C<HAS_GETESPWNAM> if getespwnam() is
available to retrieve enchanced (shadow) password entries by name.

=item C<d_getfsstat>

From F<d_getfsstat.U>:

This variable conditionally defines the C<HAS_GETFSSTAT> symbol, which
indicates to the C program that the getfsstat() routine is available.

=item C<d_getgrent>

From F<d_getgrent.U>:

This variable conditionally defines the C<HAS_GETGRENT> symbol, which
indicates to the C program that the getgrent() routine is available
for sequential access of the group database.

=item C<d_getgrps>

From F<d_getgrps.U>:

This variable conditionally defines the C<HAS_GETGROUPS> symbol, which
indicates to the C program that the getgroups() routine is available
to get the list of process groups.

=item C<d_gethbyaddr>

From F<d_gethbyad.U>:

This variable conditionally defines the C<HAS_GETHOSTBYADDR> symbol, which
indicates to the C program that the gethostbyaddr() routine is available
to look up hosts by their C<IP> addresses.

=item C<d_gethbyname>

From F<d_gethbynm.U>:

This variable conditionally defines the C<HAS_GETHOSTBYNAME> symbol, which
indicates to the C program that the gethostbyname() routine is available
to look up host names in some data base or other.

=item C<d_gethent>

From F<d_gethent.U>:

This variable conditionally defines C<HAS_GETHOSTENT> if gethostent() is
available to look up host names in some data base or another.

=item C<d_gethname>

From F<d_gethname.U>:

This variable conditionally defines the C<HAS_GETHOSTNAME> symbol, which
indicates to the C program that the gethostname() routine may be
used to derive the host name.

=item C<d_gethostprotos>

From F<d_gethostprotos.U>:

This variable conditionally defines the C<HAS_GETHOST_PROTOS> symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various gethost*() functions.  
See also F<netdbtype.U> for probing for various netdb types.

=item C<d_getlogin>

From F<d_getlogin.U>:

This variable conditionally defines the C<HAS_GETLOGIN> symbol, which
indicates to the C program that the getlogin() routine is available
to get the login name.

=item C<d_getmnt>

From F<d_getmnt.U>:

This variable conditionally defines the C<HAS_GETMNT> symbol, which
indicates to the C program that the getmnt() routine is available
to retrieve one or more mount info blocks by filename.

=item C<d_getmntent>

From F<d_getmntent.U>:

This variable conditionally defines the C<HAS_GETMNTENT> symbol, which
indicates to the C program that the getmntent() routine is available
to iterate through mounted files to get their mount info.

=item C<d_getnbyaddr>

From F<d_getnbyad.U>:

This variable conditionally defines the C<HAS_GETNETBYADDR> symbol, which
indicates to the C program that the getnetbyaddr() routine is available
to look up networks by their C<IP> addresses.

=item C<d_getnbyname>

From F<d_getnbynm.U>:

This variable conditionally defines the C<HAS_GETNETBYNAME> symbol, which
indicates to the C program that the getnetbyname() routine is available
to look up networks by their names.

=item C<d_getnent>

From F<d_getnent.U>:

This variable conditionally defines C<HAS_GETNETENT> if getnetent() is
available to look up network names in some data base or another.

=item C<d_getnetprotos>

From F<d_getnetprotos.U>:

This variable conditionally defines the C<HAS_GETNET_PROTOS> symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various getnet*() functions.  
See also F<netdbtype.U> for probing for various netdb types.

=item C<d_getpagsz>

From F<d_getpagsz.U>:

This variable conditionally defines C<HAS_GETPAGESIZE> if getpagesize()
is available to get the system page size.

=item C<d_getpbyname>

From F<d_getprotby.U>:

This variable conditionally defines the C<HAS_GETPROTOBYNAME> 
symbol, which indicates to the C program that the 
getprotobyname() routine is available to look up protocols
by their name.

=item C<d_getpbynumber>

From F<d_getprotby.U>:

This variable conditionally defines the C<HAS_GETPROTOBYNUMBER> 
symbol, which indicates to the C program that the 
getprotobynumber() routine is available to look up protocols
by their number.

=item C<d_getpent>

From F<d_getpent.U>:

This variable conditionally defines C<HAS_GETPROTOENT> if getprotoent() is
available to look up protocols in some data base or another.

=item C<d_getpgid>

From F<d_getpgid.U>:

This variable conditionally defines the C<HAS_GETPGID> symbol, which
indicates to the C program that the getpgid(pid) function
is available to get the process group id.

=item C<d_getpgrp2>

From F<d_getpgrp2.U>:

This variable conditionally defines the HAS_GETPGRP2 symbol, which
indicates to the C program that the getpgrp2() (as in F<DG/C<UX>>) routine
is available to get the current process group.

=item C<d_getpgrp>

From F<d_getpgrp.U>:

This variable conditionally defines C<HAS_GETPGRP> if getpgrp() is
available to get the current process group.

=item C<d_getppid>

From F<d_getppid.U>:

This variable conditionally defines the C<HAS_GETPPID> symbol, which
indicates to the C program that the getppid() routine is available
to get the parent process C<ID>.

=item C<d_getprior>

From F<d_getprior.U>:

This variable conditionally defines C<HAS_GETPRIORITY> if getpriority()
is available to get a process's priority.

=item C<d_getprotoprotos>

From F<d_getprotoprotos.U>:

This variable conditionally defines the C<HAS_GETPROTO_PROTOS> symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various getproto*() functions.  
See also F<netdbtype.U> for probing for various netdb types.

=item C<d_getprpwnam>

From F<d_getprpwnam.U>:

This variable conditionally defines C<HAS_GETPRPWNAM> if getprpwnam() is
available to retrieve protected (shadow) password entries by name.

=item C<d_getpwent>

From F<d_getpwent.U>:

This variable conditionally defines the C<HAS_GETPWENT> symbol, which
indicates to the C program that the getpwent() routine is available
for sequential access of the passwd database.

=item C<d_getsbyname>

From F<d_getsrvby.U>:

This variable conditionally defines the C<HAS_GETSERVBYNAME> 
symbol, which indicates to the C program that the 
getservbyname() routine is available to look up services
by their name.

=item C<d_getsbyport>

From F<d_getsrvby.U>:

This variable conditionally defines the C<HAS_GETSERVBYPORT> 
symbol, which indicates to the C program that the 
getservbyport() routine is available to look up services
by their port.

=item C<d_getsent>

From F<d_getsent.U>:

This variable conditionally defines C<HAS_GETSERVENT> if getservent() is
available to look up network services in some data base or another.

=item C<d_getservprotos>

From F<d_getservprotos.U>:

This variable conditionally defines the C<HAS_GETSERV_PROTOS> symbol,
which indicates to the C program that <netdb.h> supplies
prototypes for the various getserv*() functions.  
See also F<netdbtype.U> for probing for various netdb types.

=item C<d_getspnam>

From F<d_getspnam.U>:

This variable conditionally defines C<HAS_GETSPNAM> if getspnam() is
available to retrieve SysV shadow password entries by name.

=item C<d_gettimeod>

From F<d_ftime.U>:

This variable conditionally defines the C<HAS_GETTIMEOFDAY> symbol, which
indicates that the gettimeofday() system call exists (to obtain a
sub-second accuracy clock). You should probably include <sys/resource.h>.

=item C<d_gnulibc>

From F<d_gnulibc.U>:

Defined if we're dealing with the C<GNU> C Library.

=item C<d_grpasswd>

From F<i_grp.U>:

This variable conditionally defines C<GRPASSWD>, which indicates
that struct group in <grp.h> contains gr_passwd.

=item C<d_hasmntopt>

From F<d_hasmntopt.U>:

This variable conditionally defines the C<HAS_HASMNTOPT> symbol, which
indicates to the C program that the hasmntopt() routine is available
to query the mount options of file systems.

=item C<d_htonl>

From F<d_htonl.U>:

This variable conditionally defines C<HAS_HTONL> if htonl() and its
friends are available to do network order byte swapping.

=item C<d_iconv>

From F<d_iconv.U>:

This variable conditionally defines the C<HAS_ICONV> symbol, which
indicates to the C program that the iconv() routine is available.

=item C<d_index>

From F<d_strchr.U>:

This variable conditionally defines C<HAS_INDEX> if index() and
rindex() are available for string searching.

=item C<d_inetaton>

From F<d_inetaton.U>:

This variable conditionally defines the C<HAS_INET_ATON> symbol, which
indicates to the C program that the inet_aton() function is available
to parse C<IP> address C<dotted-quad> strings.

=item C<d_int64_t>

From F<d_int64_t.U>:

This symbol will be defined if the C compiler supports int64_t.

=item C<d_isascii>

From F<d_isascii.U>:

This variable conditionally defines the C<HAS_ISASCII> constant,
which indicates to the C program that isascii() is available.

=item C<d_isnan>

From F<d_isnan.U>:

This variable conditionally defines the C<HAS_ISNAN> symbol, which
indicates to the C program that the isnan() routine is available.

=item C<d_isnanl>

From F<d_isnanl.U>:

This variable conditionally defines the C<HAS_ISNANL> symbol, which
indicates to the C program that the isnanl() routine is available.

=item C<d_killpg>

From F<d_killpg.U>:

This variable conditionally defines the C<HAS_KILLPG> symbol, which
indicates to the C program that the killpg() routine is available
to kill process groups.

=item C<d_lchown>

From F<d_lchown.U>:

This variable conditionally defines the C<HAS_LCHOWN> symbol, which
indicates to the C program that the lchown() routine is available
to operate on a symbolic link (instead of following the link).

=item C<d_ldbl_dig>

From F<d_ldbl_dig.U>:

This variable conditionally defines d_ldbl_dig if this system's
header files provide C<LDBL_DIG>, which is the number of significant
digits in a long double precision number.

=item C<d_link>

From F<d_link.U>:

This variable conditionally defines C<HAS_LINK> if link() is
available to create hard links.

=item C<d_locconv>

From F<d_locconv.U>:

This variable conditionally defines C<HAS_LOCALECONV> if localeconv() is
available for numeric and monetary formatting conventions.

=item C<d_lockf>

From F<d_lockf.U>:

This variable conditionally defines C<HAS_LOCKF> if lockf()