srcrrqs_r Subroutine

AIX Version 4.3 Base Operating System and Extensions Technical Reference, Volume 2

srcrrqs_r Subroutine

Purpose

Copies the System Resource Controller (SRC) request header to the specified buffer. The SRC request header contains the return address where the caller sends responses for this request.

Library

System Resource Controller (libsrc.a)

Syntax

#include <spc.h>

struct srchdr *srcrrqs_r (Packet, SRChdr) 
char *Packet;
struct srchdr *SRChdr;

Description

The srcrrqs_r subroutine saves the SRC request header (srchdr) information contained in the packet the subsystem received from the Source Resource Controller. The srchdr structure is defined in the spc.h file. This routine must be called by the subsystem to complete the reception process of any packet received from the SRC. The subsystem requires this information to reply to any request that the subsystem receives from the SRC.

This subroutine is threadsafe and reentrant.

Parameters

Packet	Points to the SRC request packet received by the subsystem. If the subsystem received the packet on a message queue, the Packet parameter must point past the message type of the packet to the start of the request information. If the subsystem received the information on a socket, the Packet parameter points to the start of the packet received on the socket.
SRChdr	Points to a caller-supplied buffer. The srcrrqs_r subroutine copies the request header to this buffer.

Examples

The following will obtain the subsystem reply information:

int rc;
struct sockaddr addr;
int addrsz;
struct srcreq packet;
struct srchdr *header;
struct srchdr *rtn_addr;

/*wait to receive packet from SRC daemon */
rc=recvfrom(0, &packet, sizeof(packet), 0, &addr, &addrsz;
/* grab the reply information from the SRC packet */
if (rc>0)
{
  header = (struct srchdr *)malloc(sizeof(struct srchdr));
  rtn_addr = srcrrqs_r(&packet,header);
  if (rtn_addr == NULL)
 {
    /* handle error */
    .
    .
  }

Return Values

Upon successful completion, the srcrrq_r subroutine returns the address of the caller-supplied buffer.

Error Codes

If either of the input addresses is NULL, the srcrrqs_r subroutine fails and returns a value of NULL.