[PATCH] implement a few constants for sysconf()

[Andy Shevchenko <andy.shevchenko%gmail.com@localhost>]

Implement a set of the constants which expandes sysconf() functionality.
getconf has been updated accordingly.

Affected constans are:
        _SC_HOST_NAME_MAX
        _SC_PASS_MAX
        _SC_REGEXP
        _SC_SHELL
        _SC_SYMLOOP_MAX
---
 lib/libc/gen/sysconf.c    |   11 +++++++++++
 sys/sys/unistd.h          |   21 +++++++++++++++++++++
 usr.bin/getconf/getconf.c |    7 +++++++
 3 files changed, 39 insertions(+), 0 deletions(-)

diff --git a/lib/libc/gen/sysconf.c b/lib/libc/gen/sysconf.c
index cd3ed56..7b977ef 100644
--- a/lib/libc/gen/sysconf.c
+++ b/lib/libc/gen/sysconf.c
@@ -52,6 +52,7 @@ __RCSID("$NetBSD$");
 #include <time.h>
 #include <unistd.h>
 #include <paths.h>
+#include <pwd.h>
 
 #ifdef __weak_alias
 __weak_alias(sysconf,__sysconf)
@@ -394,6 +395,16 @@ yesno:             if (sysctl(mib, mib_len, &value, &len, 
NULL, 0) == -1)
                return -1;
        case _SC_TTY_NAME_MAX:
                return pathconf(_PATH_DEV, _PC_NAME_MAX);
+       case _SC_HOST_NAME_MAX:
+               return MAXHOSTNAMELEN;
+       case _SC_PASS_MAX:
+               return _PASSWORD_LEN;
+       case _SC_REGEXP:
+               return _POSIX_REGEXP;
+       case _SC_SHELL:
+               return _POSIX_SHELL;
+       case _SC_SYMLOOP_MAX:
+               return MAXSYMLINKS;
        default:
                errno = EINVAL;
                return (-1);
diff --git a/sys/sys/unistd.h b/sys/sys/unistd.h
index 4b79d5c..96503e3 100644
--- a/sys/sys/unistd.h
+++ b/sys/sys/unistd.h
@@ -109,6 +109,10 @@
 #define        _POSIX_READER_WRITER_LOCKS      200112L
                                /* XPG4.2 shared memory */
 #define        _XOPEN_SHM              0
+                               /* shell */
+#define        _POSIX_SHELL            1
+                               /* regular expressions */
+#define        _POSIX_REGEXP           1
 
 /* access function */
 #define        F_OK            0       /* test for existence of file */
@@ -227,6 +231,23 @@
 #define        _SC_THREAD_PROCESS_SHARED       66
 #define        _SC_THREAD_SAFE_FUNCTIONS       67
 #define        _SC_TTY_NAME_MAX                68
+#define        _SC_HOST_NAME_MAX               69
+#define        _SC_PASS_MAX                    70
+#define        _SC_REGEXP                      71
+#define        _SC_SHELL                       72
+#define        _SC_SYMLOOP_MAX                 73
+
+/* Actually, they are not supported or implemented yet */
+#define        _SC_V6_ILP32_OFF32              74
+#define        _SC_V6_ILP32_OFFBIG             75
+#define        _SC_V6_LP64_OFF64               76
+#define        _SC_V6_LPBIG_OFFBIG             77
+#define        _SC_2_PBS                       80
+#define        _SC_2_PBS_ACCOUNTING            81
+#define        _SC_2_PBS_CHECKPOINT            82
+#define        _SC_2_PBS_LOCATE                83
+#define        _SC_2_PBS_MESSAGE               84
+#define        _SC_2_PBS_TRACK                 85
 
 #ifdef _NETBSD_SOURCE
 /* Commonly provided sysconf() extensions */
diff --git a/usr.bin/getconf/getconf.c b/usr.bin/getconf/getconf.c
index 3a4241f..ddac924 100644
--- a/usr.bin/getconf/getconf.c
+++ b/usr.bin/getconf/getconf.c
@@ -176,6 +176,13 @@ static const struct conf_variable conf_table[] =
   { "GETGR_R_SIZE_MAX",                SYSCONF,        _SC_GETGR_R_SIZE_MAX    
},
   { "GETPW_R_SIZE_MAX",                SYSCONF,        _SC_GETPW_R_SIZE_MAX    
},
 
+  /* Unsorted POSIX Configurable System Variables */
+  { "HOST_NAME_MAX",           SYSCONF,        _SC_HOST_NAME_MAX       },
+  { "PASS_MAX",                        SYSCONF,        _SC_PASS_MAX            
},
+  { "SYMLOOP_MAX",             SYSCONF,        _SC_SYMLOOP_MAX         },
+  { "_POSIX_REGEXP",           SYSCONF,        _SC_REGEXP              },
+  { "_POSIX_SHELL",            SYSCONF,        _SC_SHELL               },
+
 #ifdef _NETBSD_SOURCE
   /* Commonly provided extensions */
   { "NPROCESSORS_CONF",                SYSCONF,        _SC_NPROCESSORS_CONF    
},
-- 
1.5.2.5