NLSGETCALL(3NSL) Networking Services Library Functions NLSGETCALL(3NSL)

NAME

nlsgetcall - get client's data passed via the listener

SYNOPSIS

#include <sys/tiuser.h>


struct t_call *nlsgetcall(int fildes);

DESCRIPTION

nlsgetcall() allows server processes started by the listener process to
access the client's t_call structure, that is, the sndcall argument of
t_connect(3NSL).


The t_call structure returned by nlsgetcall() can be released using
t_free(3NSL).


nlsgetcall() returns the address of an allocated t_call structure or NULL
if a t_call structure cannot be allocated. If the t_alloc() succeeds,
undefined environment variables are indicated by a negative len field in
the appropriate netbuf structure. A len field of zero in the netbuf
structure is valid and means that the original buffer in the listener's
t_call structure was NULL.

RETURN VALUES

A NULL pointer is returned if a t_call structure cannot be allocated by
t_alloc(). t_errno can be inspected for further error information.
Undefined environment variables are indicated by a negative length field
(len) in the appropriate netbuf structure.

FILES

/usr/lib/libnls.so.1
shared object

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|MT-Level | Unsafe |
+---------------+-----------------+

SEE ALSO

getenv(3C), t_alloc(3NSL), t_connect(3NSL), t_error(3NSL), t_free(3NSL),
t_sync(3NSL), attributes(7), nlsadmin(8)

WARNINGS

The len field in the netbuf structure is defined as being unsigned. In
order to check for error returns, it should first be cast to an int.


The listener process limits the amount of user data (udata) and options
data (opt) to 128 bytes each. Address data addr is limited to 64 bytes.
If the original data was longer, no indication of overflow is given.

NOTES

Server processes must call t_sync(3NSL) before calling this routine.


This interface is unsafe in multithreaded applications. Unsafe
interfaces should be called only from the main thread.


November 14, 2002 NLSGETCALL(3NSL)