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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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52
include/lib/vmcp.h Normal file
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/*
* vmcp - z/VM CP command library
*
* Copyright IBM Corp. 2005, 2018
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#ifndef LIB_VMCP_H
#define LIB_VMCP_H
#include <stdbool.h>
#ifdef __cplusplus
extern "C" {
#endif
#define VMCP_DEVICE_NODE "/dev/vmcp" /* VMCP device name */
#define VMCP_DEFAULT_BUFSZ 0x4000 /* VMCP default buffer size */
/*
* Error codes returned by vmcp() function. This enables the caller
* to emit a detailed error message on the type of failure.
*/
#define VMCP_SUCCESS 0 /* VMCP operation completed successfully */
#define VMCP_ERR_OPEN (-1) /* Error Open of VMCP device */
#define VMCP_ERR_SETBUF (-2) /* Error VMCP_SETBUF ioctl */
#define VMCP_ERR_READ (-3) /* Error VMCP read system call */
#define VMCP_ERR_GETCODE (-4) /* Error VMCP_GETCODE ioctl */
#define VMCP_ERR_GETSIZE (-5) /* Error VMCP_GETSIZE ioctl */
#define VMCP_ERR_TOOSMALL (-6) /* Error VMCP buffer too small for
* response
*/
#define VMCP_ERR_WRITE (-7) /* Error VMCP write system call */
struct vmcp_parm {
const char *cpcmd;
unsigned int buffer_size;
bool do_upper;
int cprc;
char *response;
unsigned int response_size;
};
int vmcp(struct vmcp_parm *cp);
#ifdef __cplusplus
}
#endif
#endif