From:	"Alex Vinokur" <alexvn AT bigfoot DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	`mmap' undeclared
Date:	Thu, 26 Jun 2003 07:28:05 +0300
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Hi,

=============================
Windows 2000
Intel(R) Celeron(R) CPU 1.70. GHz
DJGPP 2.03
GNU gcc/gpp version 3.2.1
=============================

I try to compile the following program.

File zzz.cpp
--------- C++ code : BEGIN ---------
#include <string>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <assert.h>
#include <errno.h>
using namespace std;

void read_file (char* filename_i)
{
int fd = open(filename_i, O_RDONLY);
  assert (fd > 2);

off_t sz = lseek(fd, 0, SEEK_END);
char* ptr = (char*)mmap(0, sz, PROT_READ, 0, fd, 0);

   errno = 0;
  if (ptr != MAP_FAILED)
  {
    string str (ptr, ptr+sz);
    munmap (ptr, sz);
  }
  else
  {
    assert (ptr == MAP_FAILED);
    printf ("=== Error : %u %s ===\n", errno, strerror (errno));
  }
  assert (ptr != MAP_FAILED);

  close(fd);
}

int main ()
{
  read_file ("zzz.txt");
  return 0;
}

--------- C++ code : END -----------


--------- Compilation : BEGIN ---------

$ gpp zzz.cpp

zzz.cpp: In function `void read_file(char*)':
zzz.cpp:17: `mmap' undeclared (first use this function)
zzz.cpp:17: (Each undeclared identifier is reported only once for each function
   it appears in.)
zzz.cpp:20: `MAP_FAILED' undeclared (first use this function)
zzz.cpp:23: `munmap' undeclared (first use this function)

--------- Compilation : END -----------


Note. Cygwin/gcc has no problem with compilation of that code.
===========================================
Windows 2000
CYGWIN_NT-5.0 1.3.22(0.78/3/2)
GNU gcc version 3.2 20020927 (prerelease)
===========================================


What is wrong?

Thanks,

   ==========================================
   Alex Vinokur
     mailto:alexvn AT connect DOT to
     http://www.simtel.net/pub/oth/19088.html
     http://sourceforge.net/users/alexvn
   ==========================================

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