From: Pascal.Obry@der.edfgdf.fr (Pascal OBRY)
Subject: strange problem with popen !!
5 Feb 1998 14:33:24 -0800
Message-ID: <043D134D9BC3600B*/c=fr/admd=atlas/prmd=edfgdf/o=der/ou=der-ccmail/s=Obry/g=Pascal/.cygnus.gnu-win32@MHS>
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I have the following program that run an executable (via popen) and
read the stdout of this program.

The problem is that it does not work when linked with MINGW32
configured to use MSVCRT40.DLL. But it does work when linked
with MSVCRT20.DLL. BTW it works too with VC !!!!

Does somebody what could be the problem ?

Pascal.

---------- cut here ---------- file : tryit.c
#include <stdio.h>

#define SIZEBUF 1000

int
main (void)
{
  FILE *FD;

  char buffer [SIZEBUF];
  char *buf;

  printf ("runme...\n");
  FD = popen ("runme paramx", "r");

  if (FD == NULL)
    printf ("error: FD=NULL\n");
  else
    printf ("FD=%d\n", (int)FD);

  printf ("get...\n");
  buf = fgets (buffer, SIZEBUF, FD);
  if (buf == NULL)
    perror ("error fgets");

  printf ("<1>%s\n", buf);
}
---------- cut here ---------- 



---------- cut here ---------- file : runme.c
#include <stdio.h>

int
main (int argc, char *argv[])
{
  fprintf (stderr, "output to stderr\n");
  if (argc > 1)
    printf ("line 1 - to be read (%s)\n", argv[1]);
  else
    printf ("line 1 - to be read\n");
  fprintf (stderr, "output to stderr\n");
  printf ("line 2 - to be read\n");
  fprintf (stderr, "output to stderr\n");
  exit (0);
}
---------- cut here ---------- 

---------- cut here ---------- the output
output to stderr
output to stderr
output to stderr
error fgets: No error
runme...
FD=2013522008
get...
<1>(null)
---------- cut here ---------- 




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