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Document _SC_IOV_MAX. Add cross-references to pathconf(2), confstr(3), and

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getconf(1).  This document still needs to be sorted and to have other missing
parameters described.
This commit is contained in:
Garrett Wollman 2001-06-18 22:18:08 +00:00
parent 7437599f41
commit 5813675eed
1 changed files with 16 additions and 3 deletions
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19
lib/libc/gen/sysconf.3
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@ -32,7 +32,7 @@
.\" @(#)sysconf.3 8.3 (Berkeley) 4/19/94
.\" $FreeBSD$
.\"
.Dd April 19, 1994
.Dd June 18, 2001
.Dt SYSCONF 3
.Os BSD 4
.Sh NAME
@ -59,7 +59,10 @@ The
.Fa name
argument specifies the system variable to be queried.
Symbolic constants for each name value are found in the include file
.Li <unistd.h> .
.Aq Pa unistd.h .
Shell programmers who need access to these parameters should use the
.Xr getconf 1
utility.
.Pp
The available values are as follows:
.Pp
@ -72,6 +75,13 @@ The maximum bytes of argument to
The maximum number of simultaneous processes per user id.
.It Li _SC_CLK_TCK
The frequency of the statistics clock in ticks per second.
.It Li _SC_IOV_MAX
The maximum number of elements in the I/O vector used by
.Xr readv 2 ,
.Xr writev 2 ,
.Xr recvmsg 2 ,
and
.Xr sendmsg 2 .
.It Li _SC_NGROUPS_MAX
The maximum number of supplemental groups.
.It Li _SC_OPEN_MAX
@ -168,7 +178,7 @@ The
.Fn sysconf
function may fail and set
.Va errno
for any of the errors specified for the library functions
for any of the errors specified for the library function
.Xr sysctl 3 .
In addition, the following error may be reported:
.Bl -tag -width Er
@ -178,6 +188,9 @@ The value of the
argument is invalid.
.El
.Sh SEE ALSO
.Xr getconf 1 ,
.Xr pathconf 2 ,
.Xr confstr 3 ,
.Xr sysctl 3
.Sh BUGS
The value for _SC_STREAM_MAX is a minimum maximum, and required to be