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// Copyright (C) 1999-2018
// Smithsonian Astrophysical Observatory, Cambridge, MA, USA
// For conditions of distribution and use, see copyright notice in "copyright"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <iostream>
#include <fstream>
using namespace std;
main(int argc, char* argv[])
{
int q=0;
// check for args
if (argc != 2 && argc != 3){
cerr << "usage: shmload [-q] fits" << endl;
exit(1);
}
if (!strncmp(argv[1],"-q",2))
q=1;
// find the file
char* fn = argv[1+q];
struct stat statb;
if (stat(fn, &statb) < 0){
cerr << "can't find file: " << fn << endl;
exit(1);
}
size_t fnsize = statb.st_size;
if (!q)
cerr << fn << " size " << fnsize << endl;
// calculate shmsize
size_t shmsize = ((fnsize/2880)+1)*2880;
// get shmid
int shmid = shmget(IPC_PRIVATE, shmsize, IPC_CREAT|0666);
if (shmid == -1) {
// give up, its bad
perror("shmid is bad");
exit(1);
}
if (!q)
cerr << "shmid " << shmid << endl;
else
cout << shmid << endl;
// get shm stats
struct shmid_ds sbuf;
if (shmctl(shmid, IPC_STAT, &sbuf)<0) {
perror("shmctl is bad");
exit(1);
}
if (!q)
cerr << "size of shared segment: " << sbuf.shm_segsz << endl;
char* addr = (char*)shmat(shmid, NULL, 0);
// if (addr == -1){
// perror("shmat failed");
// exit(1);
// }
// load image
ifstream fd(fn);
fd.read(addr,fnsize);
if (!q) {
cerr << fd.gcount() << " bytes read" << endl;
if (fd.gcount() != fnsize)
cerr << "File read error" << endl;
else
cerr << "success!" << endl;
}
}
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