nlsgetcall(3N)

nlsgetcall -- get client's data passed via the listener

Synopsis

cc [options] file -lnls -lnsl

#include <listen.h>

#include <sys/xti>

struct t_call *nlsgetcall(int fd);

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(3xti).

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

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.

Files

/usr/lib/libnsl.so
/usr/lib/libnls.a

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.

References

nlsadmin(1M), t_alloc(3xti), t_connect(3xti), t_error(3xti), t_free(3xti)

Notices

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.

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