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Diffstat (limited to 'lib/libc/gen/sysctl.3')
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diff --git a/lib/libc/gen/sysctl.3 b/lib/libc/gen/sysctl.3 deleted file mode 100644 index 3fae192..0000000 --- a/lib/libc/gen/sysctl.3 +++ /dev/null @@ -1,697 +0,0 @@ -.\" Copyright (c) 1993 -.\" The Regents of the University of California. All rights reserved. -.\" -.\" Redistribution and use in source and binary forms, with or without -.\" modification, are permitted provided that the following conditions -.\" are met: -.\" 1. Redistributions of source code must retain the above copyright -.\" notice, this list of conditions and the following disclaimer. -.\" 2. Redistributions in binary form must reproduce the above copyright -.\" notice, this list of conditions and the following disclaimer in the -.\" documentation and/or other materials provided with the distribution. -.\" 3. All advertising materials mentioning features or use of this software -.\" must display the following acknowledgement: -.\" This product includes software developed by the University of -.\" California, Berkeley and its contributors. -.\" 4. Neither the name of the University nor the names of its contributors -.\" may be used to endorse or promote products derived from this software -.\" without specific prior written permission. -.\" -.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND -.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE -.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL -.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS -.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) -.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY -.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF -.\" SUCH DAMAGE. -.\" -.\" @(#)sysctl.3 8.4 (Berkeley) 5/9/95 -.\" -.Dd May 9, 1995 -.Dt SYSCTL 3 -.Os -.Sh NAME -.Nm sysctl , -.Nm sysctlbyname -.Nd get or set system information -.Sh SYNOPSIS -.Fd #include <sys/types.h> -.Fd #include <sys/sysctl.h> -.Ft int -.Fn sysctl "int *name" "u_int namelen" "void *oldp" "size_t *oldlenp" "void *newp" "size_t newlen" -.Fn sysctlbyname "const char *name" "void *oldp" "size_t *oldlenp" "void *newp" "size_t newlen" -.Sh DESCRIPTION -The -.Fn sysctl -function retrieves system information and allows processes with -appropriate privileges to set system information. -The information available from -.Fn sysctl -consists of integers, strings, and tables. -Information may be retrieved and set from the command interface -using the -.Xr sysctl 8 -utility. -.Pp -Unless explicitly noted below, -.Fn sysctl -returns a consistent snapshot of the data requested. -Consistency is obtained by locking the destination -buffer into memory so that the data may be copied out without blocking. -Calls to -.Fn sysctl -are serialized to avoid deadlock. -.Pp -The state is described using a ``Management Information Base'' (MIB) -style name, listed in -.Fa name , -which is a -.Fa namelen -length array of integers. -.Pp -The -.Fn sysctlbyname -function accepts an ascii representation of the name and internally -looks up the integer name vector. Apart from that, it behaves the same -as the standard -.Fn sysctl -function. -.Pp -The information is copied into the buffer specified by -.Fa oldp . -The size of the buffer is given by the location specified by -.Fa oldlenp -before the call, -and that location gives the amount of data copied after a successful call -and after a call that returns with the error code ENOMEM. -If the amount of data available is greater -than the size of the buffer supplied, -the call supplies as much data as fits in the buffer provided -and returns with the error code ENOMEM. -If the old value is not desired, -.Fa oldp -and -.Fa oldlenp -should be set to NULL. -.Pp -The size of the available data can be determined by calling -.Fn sysctl -with a NULL parameter for -.Fa oldp . -The size of the available data will be returned in the location pointed to by -.Fa oldlenp . -For some operations, the amount of space may change often. -For these operations, -the system attempts to round up so that the returned size is -large enough for a call to return the data shortly thereafter. -.Pp -To set a new value, -.Fa newp -is set to point to a buffer of length -.Fa newlen -from which the requested value is to be taken. -If a new value is not to be set, -.Fa newp -should be set to NULL and -.Fa newlen -set to 0. -.Pp -The top level names are defined with a CTL_ prefix in -.Pa <sys/sysctl.h> , -and are as follows. -The next and subsequent levels down are found in the include files -listed here, and described in separate sections below. -.Pp -.Bl -column CTLXMACHDEPXXX "Next level namesXXXXXX" -offset indent -.It Sy Pa Name Next level names Description -.It CTL\_DEBUG sys/sysctl.h Debugging -.It CTL\_VFS sys/mount.h Filesystem -.It CTL\_HW sys/sysctl.h Generic CPU, I/O -.It CTL\_KERN sys/sysctl.h High kernel limits -.It CTL\_MACHDEP sys/sysctl.h Machine dependent -.It CTL\_NET sys/socket.h Networking -.It CTL\_USER sys/sysctl.h User-level -.It CTL\_VM vm/vm_param.h Virtual memory -.El -.Pp -For example, the following retrieves the maximum number of processes allowed -in the system: -.Pp -.Bd -literal -offset indent -compact -int mib[2], maxproc; -size_t len; - -mib[0] = CTL_KERN; -mib[1] = KERN_MAXPROC; -len = sizeof(maxproc); -sysctl(mib, 2, &maxproc, &len, NULL, 0); -.Ed -.Pp -To retrieve the standard search path for the system utilities: -.Pp -.Bd -literal -offset indent -compact -int mib[2]; -size_t len; -char *p; - -mib[0] = CTL_USER; -mib[1] = USER_CS_PATH; -sysctl(mib, 2, NULL, &len, NULL, 0); -p = malloc(len); -sysctl(mib, 2, p, &len, NULL, 0); -.Ed -.Sh CTL_DEBUG -The debugging variables vary from system to system. -A debugging variable may be added or deleted without need to recompile -.Fn sysctl -to know about it. -Each time it runs, -.Fn sysctl -gets the list of debugging variables from the kernel and -displays their current values. -The system defines twenty -.Ns ( Va struct ctldebug ) -variables named -.Nm debug0 -through -.Nm debug19 . -They are declared as separate variables so that they can be -individually initialized at the location of their associated variable. -The loader prevents multiple use of the same variable by issuing errors -if a variable is initialized in more than one place. -For example, to export the variable -.Nm dospecialcheck -as a debugging variable, the following declaration would be used: -.Bd -literal -offset indent -compact -int dospecialcheck = 1; -struct ctldebug debug5 = { "dospecialcheck", &dospecialcheck }; -.Ed -.Sh CTL_VFS -A distinguished second level name, VFS_GENERIC, -is used to get general information about all filesystems. -One of its third level identifiers is VFS_MAXTYPENUM -that gives the highest valid filesystem type number. -Its other third level identifier is VFS_CONF that -returns configuration information about the filesystem -type given as a fourth level identifier (see -.Xr getvfsbyname 3 -as an example of its use). -The remaining second level identifiers are the -filesystem type number returned by a -.Xr statfs 2 -call or from VFS_CONF. -The third level identifiers available for each filesystem -are given in the header file that defines the mount -argument structure for that filesystem. -.Sh CTL_HW -The string and integer information available for the CTL_HW level -is detailed below. -The changeable column shows whether a process with appropriate -privilege may change the value. -.Bl -column "Second level nameXXXXXX" integerXXX -offset indent -.It Sy Pa Second level name Type Changeable -.It HW\_MACHINE string no -.It HW\_MODEL string no -.It HW\_NCPU integer no -.It HW\_BYTEORDER integer no -.It HW\_PHYSMEM integer no -.It HW\_USERMEM integer no -.It HW\_PAGESIZE integer no -.It HW\_FLOATINGPOINT integer no -.It HW\_MACHINE\_ARCH string no -.\".It HW\_DISKNAMES integer no -.\".It HW\_DISKSTATS integer no -.El -.Pp -.Bl -tag -width "123456" -.It Li HW_MACHINE -The machine class. -.It Li HW_MODEL -The machine model -.It Li HW_NCPU -The number of cpus. -.ne 1i -.It Li HW_BYTEORDER -The byteorder (4,321, or 1,234). -.It Li HW_PHYSMEM -The bytes of physical memory. -.It Li HW_USERMEM -The bytes of non-kernel memory. -.It Li HW_PAGESIZE -The software page size. -.It Li HW_FLOATINGPOINT -Nonzero if the floating point support is in hardware. -.It Li HW_MACHINE_ARCH -The machine dependent architecture type. -.\".It Fa HW_DISKNAMES -.\".It Fa HW_DISKSTATS -.El -.Sh CTL_KERN -The string and integer information available for the CTL_KERN level -is detailed below. -The changeable column shows whether a process with appropriate -privilege may change the value. -The types of data currently available are process information, -system vnodes, the open file entries, routing table entries, -virtual memory statistics, load average history, and clock rate -information. -.Bl -column "KERNXMAXFILESPERPROCXXX" "struct clockrateXXX" -offset indent -.It Sy Pa Second level name Type Changeable -.It KERN\_ARGMAX integer no -.It KERN\_BOOTFILE string yes -.It KERN\_BOOTTIME struct timeval no -.It KERN\_CLOCKRATE struct clockinfo no -.It KERN\_FILE struct file no -.It KERN\_HOSTID integer yes -.It KERN\_HOSTNAME string yes -.It KERN\_JOB\_CONTROL integer no -.It KERN\_MAXFILES integer yes -.It KERN\_MAXFILESPERPROC integer yes -.It KERN\_MAXPROC integer yes -.It KERN\_MAXPROCPERUID integer yes -.It KERN\_MAXVNODES integer yes -.It KERN\_NGROUPS integer no -.It KERN\_NISDOMAINNAME string yes -.It KERN\_OSRELDATE integer no -.It KERN\_OSRELEASE string no -.It KERN\_OSREV integer no -.It KERN\_OSTYPE string no -.It KERN\_POSIX1 integer no -.It KERN\_PROC struct proc no -.It KERN\_PROF node not applicable -.It KERN\_SAVED\_IDS integer no -.It KERN\_SECURELVL integer raise only -.It KERN\_UPDATEINTERVAL integer no -.It KERN\_VERSION string no -.It KERN\_VNODE struct vnode no -.El -.ne 1i -.Pp -.Bl -tag -width "123456" -.It Li KERN_ARGMAX -The maximum bytes of argument to -.Xr execve 2 . -.It Li KERN_BOOTFILE -The full pathname of the file from which the kernel was loaded. -.It Li KERN_BOOTTIME -A -.Va struct timeval -structure is returned. -This structure contains the time that the system was booted. -.It Li KERN_CLOCKRATE -A -.Va struct clockinfo -structure is returned. -This structure contains the clock, statistics clock and profiling clock -frequencies, the number of micro-seconds per hz tick and the skew rate. -.It Li KERN_FILE -Return the entire file table. -The returned data consists of a single -.Va struct filehead -followed by an array of -.Va struct file , -whose size depends on the current number of such objects in the system. -.It Li KERN_HOSTID -Get or set the host id. -.It Li KERN_HOSTNAME -Get or set the hostname. -.It Li KERN_JOB_CONTROL -Return 1 if job control is available on this system, otherwise 0. -.It Li KERN_MAXFILES -The maximum number of files that may be open in the system. -.It Li KERN_MAXFILESPERPROC -The maximum number of files that may be open for a single process. -This limit only applies to processes with an effective uid of nonzero -at the time of the open request. -Files that have already been opened are not affected if the limit -or the effective uid is changed. -.It Li KERN_MAXPROC -The maximum number of concurrent processes the system will allow. -.It Li KERN_MAXPROCPERUID -The maximum number of concurrent processes the system will allow -for a single effective uid. -This limit only applies to processes with an effective uid of nonzero -at the time of a fork request. -Processes that have already been started are not affected if the limit -is changed. -.It Li KERN_MAXVNODES -The maximum number of vnodes available on the system. -.It Li KERN_NGROUPS -The maximum number of supplemental groups. -.It Li KERN_NISDOMAINNAME -The name of the current YP/NIS domain. -.It Li KERN_OSRELDATE -The system release date in YYYYMM format -(January 1996 is encoded as 199601). -.It Li KERN_OSRELEASE -The system release string. -.It Li KERN_OSREV -The system revision string. -.It Li KERN_OSTYPE -The system type string. -.It Li KERN_POSIX1 -The version of ISO/IEC 9945 (POSIX 1003.1) with which the system -attempts to comply. -.It Li KERN_PROC -Return the entire process table, or a subset of it. -An array of -.Va struct kinfo_proc -structures is returned, -whose size depends on the current number of such objects in the system. -The third and fourth level names are as follows: -.Bl -column "Third level nameXXXXXX" "Fourth level is:XXXXXX" -offset indent -.It Pa Third level name Fourth level is: -.It KERN\_PROC\_ALL None -.It KERN\_PROC\_PID A process ID -.It KERN\_PROC\_PGRP A process group -.It KERN\_PROC\_TTY A tty device -.It KERN\_PROC\_UID A user ID -.It KERN\_PROC\_RUID A real user ID -.El -.It Li KERN_PROF -Return profiling information about the kernel. -If the kernel is not compiled for profiling, -attempts to retrieve any of the KERN_PROF values will -fail with EOPNOTSUPP. -The third level names for the string and integer profiling information -is detailed below. -The changeable column shows whether a process with appropriate -privilege may change the value. -.Bl -column "GPROFXGMONPARAMXXX" "struct gmonparamXXX" -offset indent -.It Sy Pa Third level name Type Changeable -.It GPROF\_STATE integer yes -.It GPROF\_COUNT u_short[\|] yes -.It GPROF\_FROMS u_short[\|] yes -.It GPROF\_TOS struct tostruct yes -.It GPROF\_GMONPARAM struct gmonparam no -.El -.Pp -The variables are as follows: -.Bl -tag -width "123456" -.It Li GPROF_STATE -Returns GMON_PROF_ON or GMON_PROF_OFF to show that profiling -is running or stopped. -.It Li GPROF_COUNT -Array of statistical program counter counts. -.It Li GPROF_FROMS -Array indexed by program counter of call-from points. -.It Li GPROF_TOS -Array of -.Va struct tostruct -describing destination of calls and their counts. -.It Li GPROF_GMONPARAM -Structure giving the sizes of the above arrays. -.El -.ne 1i -.It Li KERN_SAVED_IDS -Returns 1 if saved set-group and saved set-user ID is available. -.It Li KERN_SECURELVL -The system security level. -This level may be raised by processes with appropriate privilege. -It may only be lowered by process 1. -.It Li KERN_VERSION -The system version string. -.It Li KERN_VNODE -Return the entire vnode table. -Note, the vnode table is not necessarily a consistent snapshot of -the system. -The returned data consists of an array whose size depends on the -current number of such objects in the system. -Each element of the array contains the kernel address of a vnode -.Va struct vnode * -followed by the vnode itself -.Va struct vnode . -.It Li KERN_UPDATEINTERVAL -The interval between -.Xr sync 2 -calls in the -.Xr update 4 -process. -.El -.Sh CTL_MACHDEP -The set of variables defined is architecture dependent. -The following variables are defined for the i386 architecture. -.Bl -column "CONSOLE_DEVICEXXX" "struct bootinfoXXX" -offset indent -.It Sy Pa Second level name Type Changeable -.It Li CPU_CONSDEV dev_t no -.It Li CPU_ADJKERNTZ int yes -.It Li CPU_DISRTCSET int yes -.It Li CPU_BOOTINFO struct bootinfo no -.It Li CPU_WALLCLOCK int yes -.El -.Sh CTL_NET -The string and integer information available for the CTL_NET level -is detailed below. -The changeable column shows whether a process with appropriate -privilege may change the value. -.Bl -column "Second level nameXXXXXX" "routing messagesXXX" -offset indent -.It Sy Pa Second level name Type Changeable -.It PF\_ROUTE routing messages no -.It PF\_INET internet values yes -.El -.Pp -.Bl -tag -width "123456" -.It Li PF_ROUTE -Return the entire routing table or a subset of it. -The data is returned as a sequence of routing messages (see -.Xr route 4 -for the header file, format and meaning). -The length of each message is contained in the message header. -.Pp -The third level name is a protocol number, which is currently always 0. -The fourth level name is an address family, which may be set to 0 to -select all address families. -The fifth and sixth level names are as follows: -.Bl -column "Fifth level nameXXXXXX" "Sixth level is:XXX" -offset indent -.It Pa Fifth level name Sixth level is: -.It NET\_RT\_FLAGS rtflags -.It NET\_RT\_DUMP None -.It NET\_RT\_IFLIST None -.El -.It Li PF_INET -Get or set various global information about the internet protocols. -The third level name is the protocol. -The fourth level name is the variable name. -The currently defined protocols and names are: -.ne 1i -.Bl -column "Protocol nameXXXXXX" "Variable nameXXX" "integerXXX" -offset indent -.It Pa Protocol name Variable name Type Changeable -.It ip forwarding integer yes -.It ip redirect integer yes -.It ip ttl integer yes -.It icmp maskrepl integer yes -.It udp checksum integer yes -.El -.Pp -The variables are as follows: -.Bl -tag -width "123456" -.It Li ip.forwarding -Returns 1 when IP forwarding is enabled for the host, -meaning that the host is acting as a router. -.It Li ip.redirect -Returns 1 when ICMP redirects may be sent by the host. -This option is ignored unless the host is routing IP packets, -and should normally be enabled on all systems. -.It Li ip.ttl -The maximum time-to-live (hop count) value for an IP packet sourced by -the system. -This value applies to normal transport protocols, not to ICMP. -.It Li icmp.maskrepl -Returns 1 if ICMP network mask requests are to be answered. -.It Li udp.checksum -Returns 1 when UDP checksums are being computed and checked. -Disabling UDP checksums is strongly discouraged. -.El -.Sh CTL_USER -The string and integer information available for the CTL_USER level -is detailed below. -The changeable column shows whether a process with appropriate -privilege may change the value. -.Bl -column "USER_COLL_WEIGHTS_MAXXXX" "integerXXX" -offset indent -.It Sy Pa Second level name Type Changeable -.It USER\_BC\_BASE\_MAX integer no -.It USER\_BC\_DIM\_MAX integer no -.It USER\_BC\_SCALE\_MAX integer no -.It USER\_BC\_STRING\_MAX integer no -.It USER\_COLL\_WEIGHTS\_MAX integer no -.It USER\_CS\_PATH string no -.It USER\_EXPR\_NEST\_MAX integer no -.It USER\_LINE\_MAX integer no -.It USER\_POSIX2\_CHAR\_TERM integer no -.It USER\_POSIX2\_C\_BIND integer no -.It USER\_POSIX2\_C\_DEV integer no -.It USER\_POSIX2\_FORT\_DEV integer no -.It USER\_POSIX2\_FORT\_RUN integer no -.It USER\_POSIX2\_LOCALEDEF integer no -.It USER\_POSIX2\_SW\_DEV integer no -.It USER\_POSIX2\_UPE integer no -.It USER\_POSIX2\_VERSION integer no -.It USER\_RE\_DUP\_MAX integer no -.It USER\_STREAM\_MAX integer no -.It USER\_TZNAME\_MAX integer no -.El -.Bl -tag -width "123456" -.Pp -.It Li USER_BC_BASE_MAX -The maximum ibase/obase values in the -.Xr bc 1 -utility. -.It Li USER_BC_DIM_MAX -The maximum array size in the -.Xr bc 1 -utility. -.It Li USER_BC_SCALE_MAX -The maximum scale value in the -.Xr bc 1 -utility. -.It Li USER_BC_STRING_MAX -The maximum string length in the -.Xr bc 1 -utility. -.It Li USER_COLL_WEIGHTS_MAX -The maximum number of weights that can be assigned to any entry of -the LC_COLLATE order keyword in the locale definition file. -.It Li USER_CS_PATH -Return a value for the -.Ev PATH -environment variable that finds all the standard utilities. -.It Li USER_EXPR_NEST_MAX -The maximum number of expressions that can be nested within -parenthesis by the -.Xr expr 1 -utility. -.It Li USER_LINE_MAX -The maximum length in bytes of a text-processing utility's input -line. -.It Li USER_POSIX2_CHAR_TERM -Return 1 if the system supports at least one terminal type capable of -all operations described in POSIX 1003.2, otherwise 0. -.It Li USER_POSIX2_C_BIND -Return 1 if the system's C-language development facilities support the -C-Language Bindings Option, otherwise 0. -.It Li USER_POSIX2_C_DEV -Return 1 if the system supports the C-Language Development Utilities Option, -otherwise 0. -.It Li USER_POSIX2_FORT_DEV -Return 1 if the system supports the FORTRAN Development Utilities Option, -otherwise 0. -.It Li USER_POSIX2_FORT_RUN -Return 1 if the system supports the FORTRAN Runtime Utilities Option, -otherwise 0. -.It Li USER_POSIX2_LOCALEDEF -Return 1 if the system supports the creation of locales, otherwise 0. -.It Li USER_POSIX2_SW_DEV -Return 1 if the system supports the Software Development Utilities Option, -otherwise 0. -.It Li USER_POSIX2_UPE -Return 1 if the system supports the User Portability Utilities Option, -otherwise 0. -.It Li USER_POSIX2_VERSION -The version of POSIX 1003.2 with which the system attempts to comply. -.It Li USER_RE_DUP_MAX -The maximum number of repeated occurrences of a regular expression -permitted when using interval notation. -.ne 1i -.It Li USER_STREAM_MAX -The minimum maximum number of streams that a process may have open -at any one time. -.It Li USER_TZNAME_MAX -The minimum maximum number of types supported for the name of a -timezone. -.El -.Sh CTL_VM -The string and integer information available for the CTL_VM level -is detailed below. -The changeable column shows whether a process with appropriate -privilege may change the value. -.Bl -column "Second level nameXXXXXX" "struct loadavgXXX" -offset indent -.It Sy Pa Second level name Type Changeable -.It VM\_LOADAVG struct loadavg no -.It VM\_METER struct vmtotal no -.El -.Pp -.Bl -tag -width "123456" -.It Li VM_LOADAVG -Return the load average history. -The returned data consists of a -.Va struct loadavg . -.It Li VM_METER -Return the system wide virtual memory statistics. -The returned data consists of a -.Va struct vmtotal . -.El -.Sh RETURN VALUES -If the call to -.Fn sysctl -is successful, the number of bytes copied out is returned. -Otherwise \-1 is returned and -.Va errno -is set appropriately. -.Sh ERRORS -The following errors may be reported: -.Bl -tag -width Er -.It Bq Er EFAULT -The buffer -.Fa name , -.Fa oldp , -.Fa newp , -or length pointer -.Fa oldlenp -contains an invalid address. -.It Bq Er EINVAL -The -.Fa name -array is less than two or greater than CTL_MAXNAME. -.It Bq Er EINVAL -A non-null -.Fa newp -is given and its specified length in -.Fa newlen -is too large or too small. -.It Bq Er ENOMEM -The length pointed to by -.Fa oldlenp -is too short to hold the requested value. -.It Bq Er ENOTDIR -The -.Fa name -array specifies an intermediate rather than terminal name. -.It Bq Er EOPNOTSUPP -The -.Fa name -array specifies a value that is unknown. -.It Bq Er EPERM -An attempt is made to set a read-only value. -.It Bq Er EPERM -A process without appropriate privilege attempts to set a value. -.El -.Sh FILES -.Bl -tag -width <netinet/icmpXvar.h> -compact -.It Pa <sys/sysctl.h> -definitions for top level identifiers, second level kernel and hardware -identifiers, and user level identifiers -.It Pa <sys/socket.h> -definitions for second level network identifiers -.It Pa <sys/gmon.h> -definitions for third level profiling identifiers -.It Pa <vm/vm_param.h> -definitions for second level virtual memory identifiers -.It Pa <netinet/in.h> -definitions for third level Internet identifiers and -fourth level IP identifiers -.It Pa <netinet/icmp_var.h> -definitions for fourth level ICMP identifiers -.It Pa <netinet/udp_var.h> -definitions for fourth level UDP identifiers -.El -.Sh SEE ALSO -.Xr sysctl 8 -.Sh HISTORY -The -.Fn sysctl -function first appeared in -.Bx 4.4 . |
