Update limits and configuration parameters for 1003.1/TC1/D6.

Implement new sysconf keys.  Change the implenentation of
_SC_ASYNCHRONOUS_IO in preparation for the next set of changes.

Move some limits which had been in <sys/syslimits.h> to <limits.h> where
they belong.  They had only ever been in syslimits.h to provide for the
kernel implementation of the CTL_USER MIB branch, which went away with
newsysctl years ago.  (There is a #error in <sys/syslimits.h> which I
will downgrade in the next commit.)

2 files changed, 14 insertions, 10 deletions

diff --git a/sys/sys/syslimits.h b/sys/sys/syslimits.h
index 1599443..20e8a47 100644
--- a/sys/sys/syslimits.h
+++ b/sys/sys/syslimits.h
@@ -37,6 +37,14 @@
 #ifndef _SYS_SYSLIMITS_H_
 #define _SYS_SYSLIMITS_H_
 
+#if !defined(_KERNEL) && !defined(_LIMITS_H_) && !defined(_SYS_PARAM_H_)
+#error "No user-serviceable parts inside."
+#endif
+
+/*
+ * Do not add any new variables here.  (See the comment at the end of
+ * the file for why.)
+ */
 #define	ARG_MAX			65536	/* max bytes for an exec function */
 #ifndef CHILD_MAX
 #define	CHILD_MAX		   40	/* max simultaneous processes */
@@ -53,20 +61,14 @@
 #define	PIPE_BUF		  512	/* max bytes for atomic pipe writes */
 #define	IOV_MAX			 1024	/* max elements in i/o vector */
 
-/* XXX - these don't belong here */
-#define	BC_BASE_MAX		   99	/* max ibase/obase values in bc(1) */
-#define	BC_DIM_MAX		 2048	/* max array elements in bc(1) */
-#define	BC_SCALE_MAX		   99	/* max scale value in bc(1) */
-#define	BC_STRING_MAX		 1000	/* max const string length in bc(1) */
-#define	COLL_WEIGHTS_MAX	    0	/* max weights for order keyword */
-#define	EXPR_NEST_MAX		   32	/* max expressions nested in expr(1) */
-#define	LINE_MAX		 2048	/* max bytes in an input line */
-#define	RE_DUP_MAX		  255	/* max RE's in interval notation */
-
 /*
  * We leave the following values undefined to force applications to either
  * assume conservative values or call sysconf() to get the current value.
  *
  * HOST_NAME_MAX
+ * LOGIN_NAME_MAX
+ *
+ * (We should do this for most of the values currently defined here,
+ * but many programs are not prepared to deal with this yet.)
  */
 #endif
diff --git a/sys/sys/unistd.h b/sys/sys/unistd.h
index dc4004b..b185a35 100644
--- a/sys/sys/unistd.h
+++ b/sys/sys/unistd.h
@@ -59,6 +59,7 @@
 #define	_POSIX_CLOCK_SELECTION		-1
 #define	_POSIX_CPUTIME			-1
 #define	_POSIX_FSYNC			200112L
+#define	_POSIX_IPV6			0
 #define	_POSIX_JOB_CONTROL		1
 #define	_POSIX_MAPPED_FILES		200112L
 #define	_POSIX_MEMLOCK			-1
@@ -142,6 +143,7 @@
 #define	_PC_REC_MAX_XFER_SIZE	15
 #define	_PC_REC_MIN_XFER_SIZE	16
 #define	_PC_REC_XFER_ALIGN	17
+#define	_PC_SYMLINK_MAX		18
 #endif
 
 #if __BSD_VISIBLE