Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!rutgers!mit-eddie!killer!jdp
From: jdp@killer.DALLAS.TX.US (Jim Pritchett)
Newsgroups: comp.sys.amiga.tech
Subject: Manx help
Keywords: Manx Aztec DOS Locks
Message-ID: <5918@killer.DALLAS.TX.US>
Date: 27 Oct 88 23:37:23 GMT
Organization: The Unix(R) Connection, Dallas, Texas
Lines: 65

Hello,
       I am making my first attempt to use the DOS functions from a C program.
I have all the manuals in one form or another, but I haven't been able to find
the problem with the code below.  Could one of the C experts out there help me
out?  Basically the problem is that although the test program below runs fine,
the system becomes severely unstable and crashes within a couple of commands
after the program terminates.  I'm sure that there is a problem with my
(mis)understanding of locks, but I don't know what it is.  Here is the source
code to my program (Aztec C v3.6a, SDB):



#include <stdio.h>

main()

{
  char cd[108];

  getcwd(cd, 108);
}

# include <functions.h>
# include <exec/types.h>
# include <libraries/dosextens.h>

getcwd(cd, length)
  char *cd;
  int length;

{
  char name[108];
  struct FileLock *lockcd, *lockram;
  struct FileInfoBlock *fib;
  short success;
 
  lockram = Lock("ram:t", ACCESS_READ);
  lockcd = CurrentDir(lockram);
  fib = AllocMem((long)sizeof(fib), 1L);
  success = Examine(lockcd, fib);
  strcpy(name, fib->fib_FileName);

printf("  %s\n", name);

  UnLock(lockram);
  lockram = CurrentDir(lockcd);

  UnLock(lockcd);
  UnLock(lockram);
  
}


                                    Thanks,

                                            Jim Pritchett

                                    UUCP: killer!gtmvax!dms3b1!caleb!jdp



P.S.  I noticed after the fact that I had not returned the memory allocated
      to the FileInfoBlock.  However, this should not destabilize my system.

}