nlsrequest(3N)

nlsrequest -- format and send listener service request message

Synopsis

cc [options] file -lnls -lnsl

#include <listen.h>

int nlsrequest (int fd, char *service_code);

extern int _nlslog;
extern char *_nlsrmsg;

Description

Given a virtual circuit to a listener process (fd) and a service code of a server process, nlsrequest formats and sends a service request message to the remote listener process requesting that it start the given service. nlsrequest waits for the remote listener process to return a service request response message, which is made available to the caller in the static, null terminated data buffer pointed to by _nlsrmsg. The service request response message includes a success or failure code and a text message. The entire message is printable.

Files

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

Return values

The success or failure code is the integer return code from nlsrequest. Zero indicates success, other negative values indicate nlsrequest failures as follows:

-1: Error encountered by nlsrequest, see t_error(3xti).

Positive values are error return codes from the listener process. Mnemonics for these codes are defined in <listen.h>.

2: Request message not interpretable.
3: Request service code unknown.
4: Service code known, but currently disabled.

If non-null, _nlsrmsg contains a pointer to a static, null terminated character buffer containing the service request response message. Note that both _nlsrmsg and the data buffer are overwritten by each call to nlsrequest.

If _nlslog is non-zero, nlsrequest prints error messages on stderr. Initially, _nlslog is zero.

References

nlsadmin(1M), t_error(3xti)

Notices

nlsrequest cannot always be certain that the remote server process has been successfully started. In this case, nlsrequest returns with no indication of an error and the caller will receive notification of a disconnect event via a T_LOOK error before or during the first t_snd or t_rcv call.