shared-by-pre-js.sh

#!/bin/bash
set -x
cat <<EOF > write.c
#include <stdio.h>


int
write_test(){
  {
    FILE* out = fopen("/hoge0.txt","w");
    char buf[1024];
    int len;
    if(out==NULL){
      printf("write:open failed\n");
      return -1;
    }
    fprintf(out,"write test\n");
    fclose(out);
  }
  return 0;
}

int
read_test(){
  {
    FILE* in = fopen("/hoge0.txt","r");
    char buf[1024];
    int len;
    if(in==NULL){
      printf("read:open failed\n");
      return -1;
    }

    while(! feof(in)){
      if(fgets(buf,sizeof(buf),in)==buf){
        printf("%s",buf);
      }
    }
    fclose(in);
  }
  return 0;
}


EOF

cat <<EOF > read.c
#include <stdio.h>


int
read_test(){
  {
    FILE* in = fopen("/hoge0.txt","r");
    char buf[1024];
    int len;
    if(in==NULL){
      printf("read:open failed\n");
      return -1;
    }

    while(! feof(in)){
      if(fgets(buf,sizeof(buf),in)==buf){
        printf("%s",buf);
      }
    }
    fclose(in);
  }
  return 0;
}


EOF

cat <<EOF > pre_w.js
var Module = {
    "noExitRuntime" : true
}
EOF

cat <<EOF > pre_r.js
var Module = {
    "noExitRuntime" : true,
    FS: SHARED_FS
}

EOF

cat <<EOF > test0.js
SHARED_FS = {};
var w = require('./write.js');

SHARED_FS = w.FS;
var r = require('./read.js');

w.ccall('write_test','number',[],[]);
w.ccall('read_test','number',[],[]);
r.ccall('read_test','number',[],[]);

EOF


emcc -o read.js read.c --pre-js pre_r.js -s MAIN_MODULE=1
emcc -o write.js write.c --pre-js pre_w.js -s MAIN_MODULE=1
node ./test0.js