12691 Want means of getting the maximum user address in a process

Reviewed by: Yuri Pankov <ypankov@fastmail.com>
Reviewed by: Dan McDonald <danmcd@joyent.com>
Reviewed by: Patrick Mooney <pmooney@pfmooney.com>
Approved by: Gordon Ross <gordon.w.ross@gmail.com>

5 files changed, 29 insertions, 27 deletions

diff --git a/usr/src/lib/libc/port/gen/sysconf.c b/usr/src/lib/libc/port/gen/sysconf.c
index 8e852ce1c8..904b848027 100644
--- a/usr/src/lib/libc/port/gen/sysconf.c
+++ b/usr/src/lib/libc/port/gen/sysconf.c
@@ -27,7 +27,7 @@
  */
 
 /*	Copyright (c) 1988 AT&T	*/
-/*	  All Rights Reserved  	*/
+/*	  All Rights Reserved	*/
 
 /* sysconf(3C) - returns system configuration information */
 
@@ -464,6 +464,9 @@ sysconf(int name)
 		case _SC_EPHID_MAX:
 			return (_sysconfig(_CONFIG_EPHID_MAX));
 
+		case _SC_UADDR_MAX:
+			return (_sysconfig(_CONFIG_UADDR_MAX));
+
 		/* UNIX 03 names - XPG6/SUSv3/POSIX.1-2001 */
 
 		case _SC_REGEXP:
diff --git a/usr/src/man/man3c/sysconf.3c b/usr/src/man/man3c/sysconf.3c
index 570c9709ae..2c5cd02f3a 100644
--- a/usr/src/man/man3c/sysconf.3c
+++ b/usr/src/man/man3c/sysconf.3c
@@ -45,11 +45,10 @@
 .\" Copyright (c) 2008, Sun Microsystems, Inc.  All Rights Reserved.
 .\" Copyright (c) 2013 Gary Mills
 .\"
-.TH SYSCONF 3C "Apr 16, 2013"
+.TH SYSCONF 3C "May 04, 2020"
 .SH NAME
 sysconf \- get configurable system variables
 .SH SYNOPSIS
-.LP
 .nf
 #include <unistd.h>
 
@@ -57,8 +56,6 @@ sysconf \- get configurable system variables
 .fi
 
 .SH DESCRIPTION
-.sp
-.LP
 The \fBsysconf()\fR function provides a method for an application to determine
 the current value of a configurable system limit or option (variable).
 .sp
@@ -319,6 +316,12 @@ _SC_TTY_NAME_MAX        TTYNAME_MAX                Max length of tty
 _SC_TZNAME_MAX          TZNAME_MAX                 Max number of bytes
                                                    supported for name
                                                    of a time zone
+_SC_UADDR_MAX                                      Maximum valid user
+                                                   address in a process.
+                                                   The returned value
+                                                   should be cast to a
+                                                   uintptr_t before
+                                                   being interpreted.
 _SC_V6_ILP32_OFF32      _POSIX_V6_ILP32_OFF32      Supports  X/Open
                                                    ILP32 w/32-bit
                                                    offset build
@@ -424,8 +427,6 @@ l l .
 .TE
 
 .SH RETURN VALUES
-.sp
-.LP
 Upon successful completion, \fBsysconf()\fR returns the current variable value
 on the system. The value returned will not be more restrictive than the
 corresponding value described to the application when it was compiled with the
@@ -474,8 +475,6 @@ _SC_SPLIT_CACHE
 .in -2
 
 .SH ERRORS
-.sp
-.LP
 The \fBsysconf()\fR function will fail if:
 .sp
 .ne 2
@@ -487,8 +486,6 @@ The value of the \fIname\fR argument is invalid.
 .RE
 
 .SH ATTRIBUTES
-.sp
-.LP
 See \fBattributes\fR(5) for descriptions of the following attributes:
 .sp
 
@@ -509,13 +506,9 @@ Standard	See \fBstandards\fR(5).
 .TE
 
 .SH SEE ALSO
-.sp
-.LP
 \fBpooladm\fR(1M), \fBzoneadm\fR(1M), \fBfpathconf\fR(2), \fBseteuid\fR(2),
 \fBsetrlimit\fR(2), \fBconfstr\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5)
 .SH NOTES
-.sp
-.LP
 A call to \fBsetrlimit()\fR can cause the value of \fBOPEN_MAX\fR to change.
 .sp
 .LP
diff --git a/usr/src/uts/common/sys/sysconfig.h b/usr/src/uts/common/sys/sysconfig.h
index 3a68d76ebe..f34713c59e 100644
--- a/usr/src/uts/common/sys/sysconfig.h
+++ b/usr/src/uts/common/sys/sysconfig.h
@@ -100,6 +100,7 @@ extern int	mach_sysconfig(int);
 #define	_CONFIG_SYMLOOP_MAX	46	/* maximum # of symlinks in pathname */
 
 #define	_CONFIG_EPHID_MAX	47	/* maximum ephemeral uid */
+#define	_CONFIG_UADDR_MAX	48	/* maximum user address */
 
 #ifdef	__cplusplus
 }
diff --git a/usr/src/uts/common/sys/unistd.h b/usr/src/uts/common/sys/unistd.h
index f366e99f6a..591a3426f5 100644
--- a/usr/src/uts/common/sys/unistd.h
+++ b/usr/src/uts/common/sys/unistd.h
@@ -106,9 +106,9 @@ extern "C" {
 #define	_SC_ARG_MAX			1
 #define	_SC_CHILD_MAX			2
 #define	_SC_CLK_TCK			3
-#define	_SC_NGROUPS_MAX 		4
+#define	_SC_NGROUPS_MAX			4
 #define	_SC_OPEN_MAX			5
-#define	_SC_JOB_CONTROL 		6
+#define	_SC_JOB_CONTROL			6
 #define	_SC_SAVED_IDS			7
 #define	_SC_VERSION			8
 /* SVR4 names */
@@ -151,21 +151,21 @@ extern "C" {
 #define	_SC_TIMER_MAX			44
 /* XPG4 names */
 #define	_SC_2_C_BIND			45
-#define	_SC_2_C_DEV    			46
+#define	_SC_2_C_DEV			46
 #define	_SC_2_C_VERSION			47
-#define	_SC_2_FORT_DEV 			48
-#define	_SC_2_FORT_RUN 			49
+#define	_SC_2_FORT_DEV			48
+#define	_SC_2_FORT_RUN			49
 #define	_SC_2_LOCALEDEF			50
-#define	_SC_2_SW_DEV   			51
+#define	_SC_2_SW_DEV			51
 #define	_SC_2_UPE			52
 #define	_SC_2_VERSION			53
 #define	_SC_BC_BASE_MAX			54
-#define	_SC_BC_DIM_MAX 			55
+#define	_SC_BC_DIM_MAX			55
 #define	_SC_BC_SCALE_MAX		56
 #define	_SC_BC_STRING_MAX		57
 #define	_SC_COLL_WEIGHTS_MAX		58
 #define	_SC_EXPR_NEST_MAX		59
-#define	_SC_LINE_MAX 			60
+#define	_SC_LINE_MAX			60
 #define	_SC_RE_DUP_MAX			61
 #define	_SC_XOPEN_CRYPT			62
 #define	_SC_XOPEN_ENH_I18N		63
@@ -210,6 +210,7 @@ extern "C" {
 #define	_SC_NPROCESSORS_MAX	516	/* maximum # of processors */
 #define	_SC_CPUID_MAX		517	/* maximum CPU id */
 #define	_SC_EPHID_MAX		518	/* maximum ephemeral id */
+#define	_SC_UADDR_MAX		519	/* maximum user address */
 
 /*
  * POSIX.1c (pthreads) names. These values are defined above
@@ -351,7 +352,7 @@ extern "C" {
 #ifdef	_XPG6
 #define	_POSIX_VERSION		200112L	/* Supports IEEE Std 1003.1-2001 */
 #else
-#define	_POSIX_VERSION		199506L /* Supports POSIX-1c DIS */
+#define	_POSIX_VERSION		199506L	/* Supports POSIX-1c DIS */
 #endif
 #endif /* _POSIX_VERSION */
 
@@ -359,7 +360,7 @@ extern "C" {
 #ifdef	_XPG6
 #define	_POSIX2_VERSION		200112L	/* Supports IEEE Std 1003.1-2001 */
 #else
-#define	_POSIX2_VERSION		199209L /* Supports ISO POSIX-2 DIS */
+#define	_POSIX2_VERSION		199209L	/* Supports ISO POSIX-2 DIS */
 #endif
 #endif /* _POSIX2_VERSION */
 
@@ -395,14 +396,14 @@ extern "C" {
 #define	_POSIX2_FORT_RUN  200112L	/* Supports FORTRAN runtime */
 #define	_POSIX2_LOCALEDEF 200112L	/* Supports creation of locales */
 #define	_POSIX2_SW_DEV	  200112L	/* Supports S/W Development Utility */
-#define	_POSIX2_UPE	  200112L 	/* Supports User Portability Utility */
+#define	_POSIX2_UPE	  200112L	/* Supports User Portability Utility */
 #else
 #define	_POSIX2_C_BIND		1	/* Supports C Language Bindings */
 #define	_POSIX2_C_DEV		1	/* Supports C language dev utility */
 #define	_POSIX2_FORT_RUN	1	/* Supports FORTRAN runtime */
 #define	_POSIX2_LOCALEDEF	1	/* Supports creation of locales */
 #define	_POSIX2_SW_DEV		1	/* Supports S/W Development Utility */
-#define	_POSIX2_UPE		1 	/* Supports User Portability Utility */
+#define	_POSIX2_UPE		1	/* Supports User Portability Utility */
 #endif /* _XPG6 */
 
 /* UNIX 03 names */
diff --git a/usr/src/uts/common/syscall/sysconfig.c b/usr/src/uts/common/syscall/sysconfig.c
index 03f2fabe13..1d4a12ff00 100644
--- a/usr/src/uts/common/syscall/sysconfig.c
+++ b/usr/src/uts/common/syscall/sysconfig.c
@@ -46,6 +46,7 @@
 #include <sys/timer.h>
 #include <sys/zone.h>
 #include <sys/vm_usage.h>
+#include <vm/as.h>
 
 extern rctl_hndl_t rc_process_sigqueue;
 
@@ -219,6 +220,9 @@ sysconfig(int which)
 	case _CONFIG_EPHID_MAX:
 		return (MAXEPHUID);
 
+	case _CONFIG_UADDR_MAX:
+		return ((long)(uintptr_t)curproc->p_as->a_userlimit);
+
 	case _CONFIG_SYMLOOP_MAX:
 		return (MAXSYMLINKS);
 	}