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Message-ID: <3AD7732C.F448C20A@cfa.harvard.edu>
Date: Fri, 13 Apr 2001 17:44:12 -0400
From: William Joye <wjoye AT cfa DOT harvard DOT edu>
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To: cygwin AT cygwin DOT com
CC: wjoye AT cfa DOT harvard DOT edu
Subject: cygwin 1.1.8 mmap()/fork() bug still not fixed
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cygwin 1.1.8 mmap()/fork() bug is still not fixed. Works fine under
cygwin 1.1.7.
The following C++ code breaks under cygwin 1.1.8-2 and all current
development snapshots...

#include <iostream.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>

main(int argc, char **argv)
{
  if( argc < 2 ) {
    cerr << "Usage: bug filename" << endl;
    exit(1);
  }

  int file = open(argv[1], O_RDONLY);
  if (file == -1) {
    cerr << "can't open data file " << argv[1] << endl;
    exit(-1);
  }

  struct stat statbuf;
  if (fstat(file, &statbuf) < 0) {
    cerr << "fstat failed" << endl;
    exit(-1);
  }

  int len = statbuf.st_size;
  if (!len) {
    cerr << "len is 0" << endl;
    exit(-1);
  }

  char *buf = mmap(NULL, len, PROT_READ, MAP_SHARED, file, 0);
  if (!buf) {
    cerr << "mmap() failed" << endl;
    exit(-1);
  }

  close(file);

  fork();

  cerr << dec << len << ' ' << hex << (short*)buf << endl;
  munmap(buf, len);
  cerr << "OK" << endl;

  exit(0);
}



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