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/* read_load.c */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include "trivial.h"
#include "programs.h"
#include "sysinfo.h"
#include "read_load.h"
#define MIN_BLK_SIZE 1024
extern char *opt_tmpf;
extern int opt_cold;
extern int opt_prog_bar;
int prep_read_load(void)
{
FILE *fp;
void *buf;
int i;
struct stat statbuf;
long mem;
if(get_ram(&mem)){
printe("ram size not available, aborting\n");
exit(2);
}
printd("ram=%lu\n", mem);
if(stat(opt_tmpf, &statbuf)){
if(errno!=ENOENT){
printsys("could not stat temporary file %s\n",opt_tmpf);
}
printd("file %s not there, creating it\n", opt_tmpf);
} else if(opt_cold){
long diff=statbuf.st_size/1024-mem;
if(diff<0)
diff *= -1;
if(diff<100){
/*
* file is roughly the same size, it may have been
* created by ourselves or do_io_load(), in any case,
* since we open it ro, we might as well use it
* (we're assuming there's no cache for it)
*/
printd("found usable file, returning\n");
return 0;
}
}
printout("Creating temporary file %s of size=%lu kB\n", opt_tmpf, mem);
if(!(fp=fopen(opt_tmpf, "w"))){
printsys("Cannot open temporary file %s, aborting\n", opt_tmpf);
}
if(stat(opt_tmpf, &statbuf)){
printsys("could not stat temporary file %s\n",opt_tmpf);
}
if(statbuf.st_blksize<MIN_BLK_SIZE){
statbuf.st_blksize=MIN_BLK_SIZE;
}
if(!(buf=calloc(1, statbuf.st_blksize))){
printsys("error allocating io buffer\n");
}
printd("mem=%lu, blksize=%lu\n", mem, (unsigned long)statbuf.st_blksize);
mem/=statbuf.st_blksize/1024;
printd("using mem=%lu\n", mem);
for(i=0; i<mem; i++){
if(fwrite(buf, statbuf.st_blksize, 1, fp)!=1){
printsys("Error writing to temporary file %s, "
"aborting\n", opt_tmpf);
}
if(opt_prog_bar){
print_prog_bar((100*i)/mem);
}
}
if(opt_prog_bar){
print_prog_bar(100);
}
printf("\n");
return 0;
}
int do_read_load(void)
{
int tmp, dev_null;
struct stat statbuf;
void *buf;
int rd, i;
unsigned long step, bsize;
if((tmp=open(opt_tmpf, O_RDONLY))==-1){
if(errno!=ENOENT){
printsys("could not open tmp file %s\n", opt_tmpf);
} else {
printe("No tmp file for read load, how does bash "
"contest handle this?\n");
exit(2);
}
}
if((dev_null=open("/dev/null", O_WRONLY))==-1){
printsys("could not open \"/dev/null\" for output\n");
}
if(stat(opt_tmpf, &statbuf)){
printsys("could not stat tmp file %s\n", opt_tmpf);
}
bsize=statbuf.st_blksize>MIN_BLK_SIZE ? statbuf.st_blksize : MIN_BLK_SIZE;
if(!(buf=malloc(bsize))){
printsys("could not allocate buffer of size %lu\n");
}
step=statbuf.st_size/(10 * bsize);
printd("bsize=%lu, st_size=%llu, using step=%lu\n", bsize,
(unsigned long long)statbuf.st_size, step);
for(;;){
i=0;
while((rd=read(tmp , buf, bsize))>0){
/*
* this is just bug-for-bug compatibility with bash
* contest: since we're just in it for generating
* read load, there's no point in writing the data
* to /dev/null
* TODO: maybe add an option to disable all emulation of
* the side-effects from using bash
*/
if(write(dev_null, buf, rd)!=rd){
printsys("error writing to \"/dev/null\", cowardly "
"aborting\n");
}
if(!(i++ % step)){
if(write(TMP_FD, buf, 10)==-1){
printsys("error reporting progress\n");
}
}
}
if(lseek(tmp, (off_t)0, SEEK_SET)==-1){
printsys("error rewinding tmp file %s\n", opt_tmpf);
}
}
return 0;
}
int cleanup_read_load(void)
{
if(unlink(opt_tmpf)){
printsys("error unlinking %s\n", opt_tmpf);
}
return 0;
}
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