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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
*/
#define FILE_TIME_OFFSET 1
#include "libreadfiles.h"
static struct timespec file_time_offset = { 0 , 900000000 };
int refresh_file( struct file_state *f_s ){
struct timespec now, tmp;
int i = 0;
if (f_s->datap) {
/* get time */
if ( clock_gettime(CLOCK_MONOTONIC, &now) < 0 ) {
/* if we don't know what time it is */
/* there's nothing we can do with this */
return 0;
}
/* if time since last refresh > delta */
tmp = timespec_add( &f_s->ts, &file_time_offset);
if ( timespec_le( &now, &tmp) ) {
/* file is recent */
return 0;
}
f_s->ts = now;
/* clear old data, make errors obvious, autoterm trailing strings */
memset ( f_s->datap, 0, f_s->datas );
}
/* if fd is null open file */
if ( f_s->fd <= 0) {
if (( f_s->fd = open (f_s->filename, O_RDONLY)) < 0) {
perror("refresh_file: open");
return -1;
}
}
if ( lseek (f_s->fd, 0, SEEK_SET) < 0 ) {
perror("refresh_file: initial seek");
return -1;
}
/* only grow, never shrink... what would be the point? */
while (f_s->datap && (i = read (f_s->fd, f_s->datap, f_s->datas)) >= f_s->datas ){
/* oh heck, what do I do if this fails? */
f_s->datas += BUFFERBLOCK;
if ((f_s->datap = realloc(f_s->datap, f_s->datas)) == NULL){
free((char *)f_s->datap);
perror("refresh_file: realloc");
return -1;
}
if ( lseek (f_s->fd, 0, SEEK_SET) < 0 ) {
perror("refresh_file: subsequent seek");
return -1;
}
}
if (i < 0 ){
/* read failed */
perror("refresh_file: file read failed");
return -1;
}
return 0;
}
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