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libvmcp: Add common vmcp code to the lib

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This patch prevents code duplication in vmcp related programs.
Some applications such as vmur, vmcp, and lsqeth
use z/VM CP commands to query information. Each program
uses its own defines and code.

Supply a library and common header file to use common code.

Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Reviewed-by: Jan Höppner <hoeppner@linux.vnet.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Thomas Richter
2018-02-22 14:30:36 +00:00
committed by Jan Höppner
parent 37c3752b31
commit eaa2ef6ba4
7 changed files with 275 additions and 1 deletions
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65
libvmcp/vmcp_example.c Normal file
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/**
* vmcp_example - Example program for vmcp.c
*
* Copyright 2018 IBM Corp.
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
//! [code]
#include <stdio.h>
#include <stdlib.h>
#include <err.h>
#include "lib/vmcp.h"
/*
* Demonstrate vmcp() function usage
*/
int main(void)
{
struct vmcp_parm cp;
int rc;
cp.cpcmd = "q osa";
cp.buffer_size = VMCP_DEFAULT_BUFSZ;
cp.do_upper = true;
rc = vmcp(&cp);
switch (rc) {
case VMCP_SUCCESS:
printf("%s\n", cp.response);
free(cp.response);
break;
case VMCP_ERR_OPEN:
errx(EXIT_FAILURE, "Could not open device %s", VMCP_DEVICE_NODE);
break;
case VMCP_ERR_SETBUF:
errx(EXIT_FAILURE, "Could not set buffer size");
break;
case VMCP_ERR_GETCODE:
errx(EXIT_FAILURE, "Could not query return code");
break;
case VMCP_ERR_GETSIZE:
errx(EXIT_FAILURE, "Could not query response size");
break;
case VMCP_ERR_WRITE:
errx(EXIT_FAILURE, "Could not issue CP command");
break;
case VMCP_ERR_READ:
errx(EXIT_FAILURE, "Could not read CP response");
break;
case VMCP_ERR_TOOSMALL:
free(cp.response);
printf("Response truncated (requires %u bytes)\n",
cp.response_size);
errx(EXIT_FAILURE, "Response buffer (%u bytes) too small",
cp.buffer_size);
break;
}
return EXIT_SUCCESS;
}
//! [code]