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/*
* Lustre common /proc PMDA
*
* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
*
* Author: Scott Emery <emery@sgi.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libreadfiles.h"
/* file_single (char *filename, int type, int *base, void **vpp)
* - Get a value from a file containing single value
* filename - name of file
* type - PCP type described by the PMAPI PM_TYPE_* enum
* base - for integer types, base as stored in the file
* - for string and aggregate types, size of memory pointed to
* ---------------- size may be changed by realloc
* vpp - pointer to pointer to storage allocated to contain value
* - pointed to pointer may change
* ---------------- pointer may be changed by realloc
* allocating and deallocating space for value is the responsibility
* of the caller
*/
int file_single (char *filename, int type, int *base, void **vpp)
{
int fd;
int n;
/* overlarge */
char b[80] = { 0 };
/* Read in the file into the buffer b */
if (( fd = open (filename, O_RDONLY)) < 0) {
perror("file_single: open");
return -1;
}
/* Okay this presents a problem vis a vis some lustre proc files.
* While the present scheme is adequate for lustre common in most
* cases, some lustre proc files have *ridiculously* large amounts
* of data stored in them. Need to come up with some dynamic
* memory buffer system for other lustre PMDAs
*/
switch (type) {
case PM_TYPE_32:
case PM_TYPE_U32:
case PM_TYPE_64:
case PM_TYPE_U64:
case PM_TYPE_FLOAT:
case PM_TYPE_DOUBLE:
if ((n = read (fd, b, sizeof(b))) < 0 ){
perror("file_single: read");
close(fd);
return -1;
}
close(fd);
break;
default:
fprintf(stderr,"file_single: type %s not supported\n", pmTypeStr(type));
close(fd);
return -1;
}
/* One would eventually write a configure script to make
* sure that the right routines are used below.. defining
* a STRTO32 and STRTOU32, etc.
*/
switch (type) {
case PM_TYPE_32:
*((long *)(*vpp)) = strtol(b,0,*base);
break;
case PM_TYPE_U32:
*((unsigned long *)(*vpp)) = strtoul(b,0,*base);
break;
case PM_TYPE_64:
*((long long *)(*vpp)) = strtoll(b,0,*base);
break;
case PM_TYPE_U64:
*((unsigned long long *)(*vpp)) = strtoull(b,0,*base);
break;
case PM_TYPE_FLOAT:
*((float *)(*vpp)) = strtof(b,0);
break;
case PM_TYPE_DOUBLE:
*((double *)(*vpp)) = strtod(b,0);
break;
}
return 0;
}
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