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.\"    may be used to endorse or promote products derived from this software
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\"
.\" Note: The date here should be updated whenever a non-trivial
.\" change is made to the manual page.
.Dd January 8, 1997
.Dt EXAMPLE 3
.\" Note: Only specify the operating system when the command
.\" is FreeBSD specific, otherwise use the .Os macro with no
.\" arguments.
.Os FreeBSD 3.0
.Sh NAME
.Nm example
.Nd example library function manual page
.Sh SYNOPSIS
.Fd #include <example.h>
.Ft int
.Fn example "char *ptr" "int mode"
.Sh DESCRIPTION
This is an example library function manual page for
the 
.Fn example
function.  It is intended
that this example can be used as a template when writing
a new manual page.
.Pp
The
.Fn example
function takes two arguments:
.Fa ptr
and
.Fa mode .
The argument
.Fa mode
may have one of the following values:
.Bl -tag -width EXAMPLE_ONE
.It Dv EXAMPLE_ONE
First example of a defined variable.
.Dv EXAMPLE_ONE is described below.
.It Dv EXAMPLE_TWO
Second example.
.El
.Pp
The above value are defined in
.Aq Pa example.h
as follows:
.Bd -literal
#define EXAMPLE_ONE  1
#define EXAMPLE_TWO  2
.Ed
.Sh RETURN VALUES
A 0 value is returned if the operation succeeds,
otherwise
.Fn example
returns -1 and the global variable
.Va errno
indicates the reason for the failure.
.Sh ENVIRONMENT
The 
.Fn example
library function ignores the
.Ev EXAMPLE
environment variable.
.Sh FILES
.Bl -tag -width /dev/null -compact
.It Pa /dev/null
Example of a file in the
.Sx FILES
section.
.El
.Sh SEE ALSO
.Xr example 1 ,
.Xr example 4 ,
.Xr mdoc 7 ,
.Xr mdoc.samples 7
.Rs
.%A A. B. Author
.%T Example RFC Title
.%O RFC0000
.Re
.Rs
.%A A. B. Author
.%B Example Book Title
.%O ISBN-0-000-00000-0
.Re
.Rs
.%A A. B. Author
.%D January 1997
.%J Example Journal Name
.%T Example Article Title
.Re
.Sh STANDARDS
If the command conforms to some standard, such as
.St -p1003.2
or
.St -ansiC ,
it should be noted here.
.Sh DIAGNOSTICS
None.
.Sh ERRORS
.\" Delete any errno's that are not returned by your
.\" function or system call and then tailor the
.\" remaining text as needed.
.Fn Example
will fail if:
.Bl -tag -width Er
.It Bq Er EPERM
Operation not permitted.
.It Bq Er ENOENT
No such file or directory.
.It Bq Er ESRCH
No such process.
.It Bq Er EINTR
Interrupted system call.
.It Bq Er EIO
Input/output error.
.It Bq Er ENXIO
Device not configured.
.It Bq Er E2BIG
Argument list too long.
.It Bq Er ENOEXEC
Exec format error.
.It Bq Er EBADF
Bad file descriptor.
.It Bq Er ECHILD
No child processes.
.It Bq Er EDEADLK
Resource deadlock avoided.
.It Bq Er ENOMEM
Cannot allocate memory.
.It Bq Er EACCES
Permission denied.
.It Bq Er EFAULT
Bad address.
.It Bq Er ENOTBLK
Block device required.
.It Bq Er EBUSY
Device busy.
.It Bq Er EEXIST
File exists.
.It Bq Er EXDEV
Cross-device link.
.It Bq Er ENODEV
Operation not supported by device.
.It Bq Er ENOTDIR
Not a directory.
.It Bq Er EISDIR
Is a directory.
.It Bq Er EINVAL
Invalid argument.
.It Bq Er ENFILE
Too many open files in system.
.It Bq Er EMFILE
Too many open files.
.It Bq Er ENOTTY
Inappropriate ioctl for device.
.It Bq Er ETXTBSY
Text file busy.
.It Bq Er EFBIG
File too large.
.It Bq Er ENOSPC
No space left on device.
.It Bq Er ESPIPE
Illegal seek.
.It Bq Er EROFS
Read-only file system.
.It Bq Er EMLINK
Too many links.
.It Bq Er EPIPE
Broken pipe.
.It Bq Er EDOM
Numerical argument out of domain.
.It Bq Er ERANGE
Result too large.
.It Bq Er EAGAIN
Resource temporarily unavailable.
.It Bq Er EWOULDBLOCK
Operation would block.
.It Bq Er EINPROGRESS
Operation now in progress.
.It Bq Er EALREADY
Operation already in progress.
.It Bq Er ENOTSOCK
Socket operation on non-socket.
.It Bq Er EDESTADDRREQ
Destination address required.
.It Bq Er EMSGSIZE
Message too long.
.It Bq Er EPROTOTYPE
Protocol wrong type for socket.
.It Bq Er ENOPROTOOPT
Protocol not available.
.It Bq Er EPROTONOSUPPORT
Protocol not supported.
.It Bq Er ESOCKNOTSUPORT
Socket type not supported.
.It Bq Er EOPNOTSUPP
Operation not supported.
.It Bq Er EPFNOSUPPORT
Protocol family not supported.
.It Bq Er EAFNNOSUPPORT
Address family not supported by protocol family.
.It Bq Er EADDRINUSE
Address already in use.
.It Bq Er EADDRNOTAVAIL
Cannot assign requested address.
.It Bq Er ENETDOWN
Network is down.
.It Bq Er ENETUNREACH
Network is unreachable.
.It Bq Er ENETRESET
Network dropped connection on reset.
.It Bq Er ECONNABORTED
Software causes connection abort.
.It Bq Er ENOBUFS
No buffer space available.
.It Bq Er EISCONN
Socket is already connected.
.It Bq Er ENOTCONN
Socket is not connected.
.It Bq Er ESHUTDOWN
Cannot send after socket shutdown.
.It Bq Er ETOOMANYREFS
Too many references:  cannot splice.
.It Bq Er ETIMEDOUT
Operation timed out.
.It Bq Er ECONNREFUSED
Connection refused.
.It Bq Er ELOOP
Too many levels of symbolic links.
.It Bq Er ENAMETOOLONG
File name too long.
.It Bq Er EHOSTDOWN
Host is down.
.It Bq Er EHOSTUNREACH
No route to host.
.It Bq Er ENOTEMPTY
Directory not empty.
.It Bq Er EPROCLIM
Too many processes.
.It Bq Er EUSERS
Too many users.
.It Bq Er EDQUOT
Disc quota exceeded.
.It Bq Er ESTALE
Stale NFS file handle.
.It Bq Er EREMOTE
Too many levels of remote in path.
.It Bq Er EBADRPC
RPC struct is bad.
.It Bq Er ERPCMISMATCH
RPC version wrong.
.It Bq Er EPROGUNAVAIL
RPC program not available.
.It Bq Er EPROGMISMATCH
Program version wrong.
.It Bq Er EPROCUNAVAIL
Bad procedure for program.
.It Bq Er ENOLCK
No locks available.
.It Bq Er ENOSYS
Function not implemented.
.It Bq Er EFTYPE
Inappropriate file type or format.
.It Bq Er EAUTH
Authentication error.
.It Bq Er ENEEDAUTH
Need authenticator.
.El
.Sh HISTORY
The
.Nm
manual page example first appeared in
.Fx 3.0 .
.Pp
Some other common
.Sx HISTORY
section examples are:
.Pp
The
.Nm
manual page example first appeared in
.Bx 4.4 .
.Pp
The
.Nm
manual page example first appeared in
.At v6 .
.Sh AUTHOR
This
manual page was written by Mike Pritchard 
.Aq mpp@FreeBSD.ORG .
.Sh BUGS
The actual code for this function is vaporware.